Linear Technology DC1717A Quick setup guide

dc1717afa

DEMO MANUAL DC1717A

Description

LTC4417

Prioritized PowerPath™ Controller

Demonstration circuit DC1717A uses the LT C

4417 to

arbitrate between three input supply rails,selecting the

highest priority,valid supply to power the load.The rail’s

priority is defined by the input connection (V1-V3). Each

rail has overvoltage and undervoltage thresholds set by

external resistors.If the highest priority rail voltage falls

out of the defined window (overvoltage or undervoltage),

the rail with the next highest priority,which is valid,is

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

performance summary

Specifications are at TA= 25°C

enabled and powers the load.Two or more LTC4417s

can be cascaded to provide switchover between more

than three rails.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1717A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V1-V3, VOUT V1 to V3, VOUT Operating Supply Range 2.5 36 V

ΔVGOpen (VS-VG) Clamp Voltage VOUT = 11V, G1 to G3 = Open 5.4 6.2 6.7 V

ΔVG(SOURCE) Sourcing (VS-VG) Clamp Voltage VOUT = 11V, I = –10µA 5.8 6.6 7 V

ΔVG(SINK) Sinking (VS-VG) Clamp Voltage VOUT = 11V, I = 10µA 4.5 5.2 6 V

ΔVG(OFF) G1 to G3 Off (VS-VG) Threshold V1 = V2 = V3 = 2.8V, VOUT = 2.6V, G1 to G3 Rising Edge 0.12 0.35 0.6 V

ΔVG(SLEW,ON) G1 to G3 Pull-Down Slew Rate VOUT = 11V, CGATE = 10nF 4 9 20 V/µs

ΔVG(SLEW,OFF) G1 to G3 Pull-Up Slew Rate VOUT = 11V, CGATE = 10nF 7.5 13 22 V/µs

IGATE(LOW) G1 to G3 Low Pull-Down Current VOUT = 2.6V, V1 to V3 = 2.8V, (G1 to G3) = ΔVG+ 300mV 0.8 2 7 µA

VREV Reverse Voltage Threshold Measure (V1 to V3) – VOUT, VOUT Falling 30 120 200 mV

tG(SWITCHOVER) Break-Before-Make Time VOUT = 11V, CGATE = 10nF 0.7 2 3 µs

VVALID(OL) VALID1 to VALID3 Output Low Voltage I = 1mA, (V1 to V3) = 2.5V, VOUT = 0V 0.2 0.55 V

tPVALID(OFF) VALID1 to VALID3 Delay OFF from

OV/UV Fault

5 8 13 µs

VSHDN(THR) SHDN Threshold Voltage SHDN Rising 0.4 0.8 1.2 V

VSHDN_EN(HYS) SHDN, EN Threshold Hysteresis 100 mV

ISHDN_EN SHDN, EN Pull-Up Current SHDN = EN = 0V –0.5 –2 –5 µA

VOV_UV(THR) OV1 to O3, UV1 to UV3 Comparator

Threshold

VOUT = 11V, OV1 to OV3 Rising, UV1 to UV3 Falling 0.985 1 1.015 V

VOV_UV(HYS) OV1 to O3, UV1 to UV3 Comparator

Hysteresis

VOUT = 11V 15 30 45 mV

tVALID V1 to V3 Validation Time 100 256 412 ms

V1 Operating Voltage of Channel V1 9.6 12 14.4 V

V2 Operating Voltage of Channel V2 4 5 6 V

V3 Operating voltage of Channel V3 6.4 8 9.6 V

ILOAD Load Current 2 A

AVI Auxiliary Voltage Input 6 24 V

dc1717afa

DEMO MANUAL DC1717A

overview

operating principles

The LTC4417 controls three sets of external back-to-back

P-channel MOSFETs to connect the proper rail to the

load. Precision comparators are used to monitor each of

the three input rails for both UV and OV conditions.The

highest priority input supply whose voltage is within its

respective OV/UV window for at least 256ms is consid-

ered valid and connected to the load.Low signals on the

VALID1, VALID2,and VALID3 pins indicate validation of

the V1, V2, and V3 voltages.

DC1717A is designed to operate from inputs of 12V,

5V, and 8V, applied to V1, V2and V3respectively.The

valid range of each supply is ±20%, as set by OV and UV

comparators and their associated resistive dividers.V1

has the highest priority,V3has the lowest.The highest

priority input that is also within its valid range is selected

to power the output.V1, V2and V3inputs are protected

against input glitches of up to ±42V. Maximum load cur-

rent is 2A, limited by MOSFET capability.

Logic and LEDs are included to provide visual information

about the operating status.These circuits are powered

from a 6V to 24V auxiliary voltage input (AVI)which is

regulated by an LT3060 (U4) to 5V. This auxiliary 5V rail

also powers 100kΩ pull-ups for VALID pins.AVI must be

present in order for the board to operate.See the Modifica-

tion section for a means of eliminating AVI.

To eliminate back-and-forth switching during rail switcho-

ver,theLTC4417providesa30mVhysteresisintheOVand

UVcomparators,andanexternallyadjustablecurrentmode

hysteresis using the OV/UV resistive dividers.DC1717A’s

input reference hysteresis is 6%, and can be changed to

3% by moving the JP1 jumper to the 30mV position.

The controller’s “break-before-make” switching method

prevents cross conduction between input channels and

reverse current from the output capacitor into the selected

input supply.

Each channel’s control circuit of the LTC4417 has a REV

comparator, which monitors the connecting input supply

and output load voltage.The REV comparator delays the

connection until the output voltage droops 120mV below

the input voltage. This prevents reverse current.

TheLTC4417has two common control pins:EN andSHDN.

Pulling the EN pin below 1V turns off all external back-to-

back P-channel MOSFETs.When this pin is driven above

1V, the highest priority valid channel is connected to the

load. All these actions are provided without resetting the

256ms OV/UV timers.

Pulling the SHDN pin below 0.8V turns off all external

back-to-back P-channel MOSFETs,placing the controller

in a low current state and resetting the 256ms timers

used to validate input rail voltages.It requires at least

256ms to validate each rail voltage after the SHDN pin

signal goes high.

The LTC4417 features two different driving modes for the

P-channel MOSFET gates.

One mode is provided by the internal soft-start circuitry,

which limits output voltage slew rate to no more than

5V/ms.Asthehighestoutput voltageslewrate,usually,can

impose the highest requirements for circuit components,

5V/ms should be taken into account as a worst case for

component selection.

The soft-start circuitry is enabled each time under the

following conditions:

• If the LTC4417 is first powered on, or

• If SHDN is forced low, or

• If VOUT falls below ~0.7V

Soft-start is disabled when:

• any channel turns off,including the channel that is soft

starting.

• 32ms validation delay time has elapsed during the soft-

start interval.

dc1717afa

DEMO MANUAL DC1717A

Design proceDure for moDification of Dc1717a

operating principles

The other driving mode of the P-channel MOSFETs is used

inthevoltageswitching operation,when the higher priority

rail replaces the rail losing validity.The gate driver oper-

ates with a fixed current,which is defined by the external

component parameters RSand CSshown in Figure 1.

The LTC4417 circuit designer should select the value of

RSand CSbased on the MOSFET parameters,power rail

source characteristics,acceptable output voltage droop

during transient, and the value of load capacitance.

CIN1

68µF CS

VS1

LTC4417

G1 VOUT VOUT

BAT54

12V WALL

ADAPTER

V1 IRF7324

M1 M2

47µF

CVS1

Figure 1

The valid input range for any supply is controlled by the

OV and UV comparators with resistive dividers (R4-R13).

See the LTC4417 data sheet for design equations to select

resistors to match a particular requirement.

DualMOSFETs,Q1-Q3,maybe replaced with singledevices

Q4-Q9 by simply removing Q1-Q3. Pads for Q4-Q9 are

located on the bottom side of the board.

The requirement for AVI may be eliminated by removing

jumpers JP2and JP3, and removing resistor R19. This

modification leaves the LEDs unpowered and the inputs

of U2and U3clamp the VALID pins at 0.7V, but otherwise

leaves the LTC4417 operating autonomously.

The following design considerations and equations dem-

onstrate the interrelation of the main component values

and transient parameters in the rail transitions,when the

output voltage exceeds 0.7V. The variables CSand RS

used in the design equations correspond to the following

board components:

• C20, R23 for V1 (+12V channel)

• C21, R26 for V2 (+5.0V channel)

• C22, R28 for V3 (+8.0V channel)

Tohavedominantinfluenceonthetransienttime CSshould

be at least ten times larger than the P-channel MOSFET’s

reverse transfer capacitance (Miller). In this design,for

all rails, CS(C20, C21,and C22) equals 47nF.

The slew rate of the output voltage can be expressed as

a function of CS:

OUT

dt =

SINK

– | V

THRES

•C

(1)

where:

• VSINK is the LTC4417 parameter rated in the data sheet

as ∆VG(SINK) = 4.5V-6V.

• VTHRES is the P-channel gate threshold voltage,which

is between –1.5V and –3.5V for the Si7905DN installed

on the board.

• RS= 249Ω and CS= 47nF.

Given that dVOUT/dt is based on the transient time require-

ment, it is possible to define RSfrom equation 1.

Theoutputvoltageslewrate,dVOUT/dt,rangeforthecircuit

withthelistedparametersisbetween 85V/msand385V/ms.

During the transition of rails,the load can be disconnected

from any rail for a time:

TDISCON = tG(SWITCHOVER) + tpVALID(OFF) + tGATE_THRES

Twofirst summands of theTDISCON arerated intheLTC4417

data sheet as:

tG(SWITCHOVER) = (0.3 to 3)µs

tpVALID(OFF) = (5 to 13)µs

dc1717afa

DEMO MANUAL DC1717A

The second summand,tpVALID(OFF),should be taken into

account if the associated LTC4417 input does not have

any bypass capacitor and the rail can be disconnected

from the input instantly.

The third one must be calculated as:

tGATE_ THRES =RS•CS–In 1– VTHRES

VSINK

⎛

⎝

⎜⎞

⎠

⎟

⎡

⎣

⎢

⎤

⎦

⎥

(2)

It is possible to determine the minimum capacitive load

required to hold the output up during switchover as a:

CLOAD(MIN) ≥

LOAD(MAX)

•T

DISCON

VOUT(DROOPMAX)

(3)

where:

• ILOAD(MAX) is the maximum load current, A

• VOUT(DROOPMAX) is the maximum acceptable voltage

droop, V

Design proceDure for moDification of Dc1717a

S•CS–In 1– VTHRES

VSINK

⎛

⎝

⎜⎞

⎠

⎟

⎡

⎣

⎢⎤

⎦

⎥=10µs

Calculate RSwith CL(INIT)

Recalculate CL with RS

Done.

Use CL(INIT) and RS

Is recalculated CL

lower than initial

CL(INIT)?

As shown in the equation (3), the use of external slew rate

control will add additional delay to the total switchover

time. Unfortunately,the actual components cannot be

chosen until the load capacitance is known.This circular

issue can only be resolved through an iterative process.

Theprocess starts by calculating the CLOAD(MIN),assuming

thattGATE_THRES =10μs.For clarity this valuewill be labeled

CLOAD(INIT).Using the calculated CLOAD(INIT),calculate RS

from the expression of the TDISCON.To ensure the newly

calculated RSbased on CLOAD(INIT) is sufficient,calculate

CLOAD with the calculated RS.

If CLOAD(INIT) (the initial calculated CLOAD)is higher than

the newly calculated CLOAD then the process is completed.

If the CLOAD(INIT) is lower than the newly calculated CLOAD,

calculateRSusing the highervalueand repeat thisprocess.

Figure 2

dc1717afa

DEMO MANUAL DC1717A

turrets

Jumpers

leDs

V1: 12V supply input; do not exceed ±42V.

V2: 5V supply input; do not exceed ±42V.

V3: 8V supply input; do not exceed ±42V.

GND: Adjacent ground connection for input supplies.

VOUT: Output for up to 2A load.

GND: Adjacent ground connection for load.

AVI:Auxiliary Voltage Input. 6V to 24V input regulated

by U4to 5V for LEDs,logic and pull ups on various pins.

GND: Adjacent ground connection for auxiliary supply.

5V: 5V regulated output provided by U4, for powering

logic, LEDs and pull ups.Use this turret to verify that 5V

is present.

Each of the following turrets is a direct connection to the

like-name LTC4417 pin:

VALID1: pulled up with 100kOhm to auxiliary 5V supply.

VALID2: pulled up with 100kOhm to auxiliary 5V supply.

VALID3: pulled up with 100kOhm to auxiliary 5V supply.

EN: pulled up by 2μA internal to the LTC4417. Optional

R33 may be added as a pull-up to the auxiliary 5V power

supply.

SHDN:pulled up by 2μA internal to the LTC4417. Optional

R36 may be added as a pull-up to the auxiliary 5V power

supply.

CAS: used to cascade a second DC1717A. Connect the

CAS turret of the high priority DC1717A to the EN turret

of the lower priority DC1717A.

Grounds must be connected in common.

JP1, HYS:Add 30mV fixed hysteresis to the OV and UV

comparators, or 3% referred to actual supply input.In the

RHYS position input-referred hysteresis is set to 6.4%, as

controlled by R11. Default stuffing position is for 30mV.

JP2, EN:Directly controls EN pin.Default stuffing position

is ON, pulled up by internal 2μA current source.

No more than one of D8, D9and D10 will be illuminated

at any given moment:

D8: indicates power is being taken from V1.

D9: indicates power is being taken from V2.

D10: indicates power is being taken from V3.

D11, D16 and D17 indicate the presence of a valid input

on any of the three supplies:

D17: V1 is 12V±20%.

D11: V2 is 5V±20%.

D16: V3 is 8V±20%.

dc1717afa

DEMO MANUAL DC1717A

Quick start proceDure

Refer to the Figure 3for proper measurement equipment

setup and follow the procedure below:

Initially, the LTC4417 should be disabled by:

• placing the jumper JP2 (EN) header in the OFF position,

and

• placing the jumper JP3 (SHDN)header in the OFF

position

Connecting the auxiliary power source (6V to 24V) to

the DC1717A (AVI and GND turrets)lights the green LED

(LDO-D12) indicating the presence of auxiliary +5V supply

for powering logic.

With power off,connect three power supplies with output

voltages of 12V, 5V, and 8V to corresponding DC1717A

turrets or banana jacks V1(+12V), V2(+5V), V3(+8V),

and GND.

Connect 6Ω load resistor (30W) to the DC1717A output

turret or banana jack (VOUT). Do not use an electronic

load in constant current mode.

Turn on three power supplies.No additional LEDs should

light.

Change the jumper JP3 (SHDN)header position from

OFF to ON.Three LEDs (VALID1, VALID2,and VALID3)

validating the input rail voltages should light.

Placing the jumper JP2 (EN) in the ON position turns on

the LTC4417 powering the load with 12V (2.0A). In an

initial power up the LTC4417 uses a fixed slew rate for the

output voltage, which should be not larger than 5V/ms.

Theprioritizingfunctionisdemonstrated by simply turning

off one or two of the V1, V2and V3supplies.The output

will be powered from the remaining supply of the high-

est priority.V1, V2and V3may be adjusted up and down

beyond ±20% to invalidate a given input.

6Ω

RESISTIVE

LOAD

12V

POWER

SUPPLY

POWER

SUPPLY

POWER

SUPPLY

Figure 3

dc1717afa

DEMO MANUAL DC1717A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 0 C1, C3, C5, C8 CAP., 1206 OPT

2 0 C2, C4, C6, C9 CAP., 2220 OPT

3 1 C7 CAP., ALUM., 47µF 50V 20% SMT SUN ELECT., 50CE47BS

4 5 C10, C11, C12, C13, C15 CAP., X5R, 1µF 50V, 10%, 0603 MURATA, GRM188R61H105KAALD

5 1 C14 CAP., X5R 10µF 10V 20% 0805 TAIYO YUDEN LMK212ABJ106MG -T

6 1 C16 CAP., NPO 10nF 50V 5% 0805 NIC, NMC0805NPO103J50TRPF

7 3 C17, C18, C19 CAP., X5R 0.1µF 50V 10% 0805 TAIYO YUDEN UMK212BJ104KG-T

8 3 C20, C21, C22 CAP., X7R 0.047µF 50V, 10%, 0805 MURATA, GRM21BR71H473KA01L

9 3 D1, D2, D3 DIODE, TVS BI-DIRECTIONAL, 26V, 600W DIODES/ZETEX SMBJ26CA-13-F

10 0 D7 ZENER DIODE, 5.1V SOD-123 OPT

11 8 D8-D12, D16, D17, D18 LED, GREEN, LED-ROHM-SML-01 ROHM, SML-012P8TT86

12 3 D13, D14, D15 DIODE, SCHOTTKY, SOD323 VISHAY SEMI., BAT42WS-E3-08

13 9 E1-E4, E6, E13-E16 TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0

14 6 E7, E8, E9, E10, E11, E12 TURRET, 0.063" MILL-MAX 2308-2-00-80-00-00-07-0

15 3 JP1, JP2, JP3 HEADERS, SGL. ROW 3 PINS 2mm CTRS. SAMTEC TMM-103-02-L-S

16 3 SHUNTS ON JP1-JP3 (1&2) SHUNT, 2mm CTRS. SAMTEC 2SN-BK-G

17 6 J1, J2, J3, J4, J5, J6 JACK, BANANA KEYSTONE 575-4

18 3 Q1, Q2, Q3 DUAL P-CHAN., 40V POWERPAK1212-8-DUAL VISHAY Si7905DN-T1-GE3

19 0 Q4, Q5, Q6, Q7, Q8, Q9 MOSFET P-CHAN., 40V, FDD4685, DPAK OPT

20 1 Q10 XTOR N-CHAN., SOT23 DIODE INC., MMBTA42-7-F

21 1 Q11 XTOR N-CHAN., SOT23 DIODE INC., MMBT3904-7-F

22 1 R4 RES., CHIP 1.69M 0.125W 1% 0805 VISHAY, CRCW08051M69FKEA

23 3 R5, R8, R12 RES., CHIP 69.8k 0.125W 1% 0805 VISHAY, CRCW080569K8FKEA

24 3 R6, R9, R13 RES., CHIP 130k 0.125W 1% 0805 NIC, NRC10F1303TRF

25 1 R7 RES., CHIP 590k 0.125W 1% 0805 VISHAY, CRCW0805590KFKEA

26 1 R10 RES., CHIP 1.05M 0.125W 1% 0805 VISHAY, CRCW08051M05FKEA

27 1 R11 RES., CHIP 127k 0.1W 1% 0603 VISHAY, CRCW0603127KFKED

28 7 R14-R16, R20-R22, R29 RES., CHIP 1k 0.1W 5% 0603 VISHAY, CRCW06031K00JNEA

29 0 R17 RES., CHIP 845k 0.1W 1% 0603 OPT

30 0 R18 RES., CHIP 115k 0.06W 1% 0603 OPT

31 1 R19 RES., CHIP 30.9k 0.1W 1% 0603 VISHAY, CRCW060330K9FKEA

32 3 R23, R26, R28 RES., CHIP 249 0.1W 1% 0603 VISHAY, CRCW060249RFKEA

33 5 R30, R31, R32, R33, R36 RES., CHIP 100k 0.1W 5% 0603 NIC, NRC06J104TRF

34 1 R34 RES., CHIP 68k 0.25W 5% 1206 NIC, NRC12J683TRF

35 1 R35 RES., CHIP 240Ω 0.25W 1% 1206 VISHAY, CRCW1206240RFKEA

36 1 U1 I.C., POWERPATH CONTROLLER, QFN24UF-4×4 LINEAR TECH CORP. LTC4417CUF

37 3 U2,U3,U5 I.C., TRIPPLE 3-INPUT NOR GATE TSSOP14 NXP/PHILIPS SEMI. 74HC27PW

38 1 U4 I.C., LOW DROPOUT REG. TSOT23-8 LINEAR TECH CORP. LT3060ETS8-5

39 4 MH1-MH4 STANDOFF, NYLON, 0.50, 1/2" KEYSTONE, 8833 (SNAP ON)

dc1717afa

DEMO MANUAL DC1717A

schematic Diagram

D D

C C

B B

A A

2. INSTALL SHUNTS ON JUMPERS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

LED DRIVER

VOUT

5V 5V 5V

5V5V

VS1

VS2

VS3

FG1

FG2

FG3

/VALID1

/VALID2

/VALID3

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLAD O.PRODUCTION

__ 307-23-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLAD O.PRODUCTION

__ 307-23-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLAD O.PRODUCTION

__ 307-23-15

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1717A

Thursday, July 23, 2015 1 2

PRIORITIZED POWERPATH CONTROLLER

N/A LTC4417CUF

KIM T.

VLAD O.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1717A

Thursday, July 23, 2015 1 2

PRIORITIZED POWERPATH CONTROLLER

N/A LTC4417CUF

KIM T.

VLAD O.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1717A

Thursday, July 23, 2015 1 2

PRIORITIZED POWERPATH CONTROLLER

N/A LTC4417CUF

KIM T.

VLAD O.

Si7905DN

7 1

3 6

8 5

OPT

2220

JP3

OFF

SHDN

SMBJ26CA

E10 EN

E11 SHDN

1.69M

0805

Q11

MMBT3904

2 3

E12 CAS

D13

BAT42WS-V

R33

100k

C22

0.047uF

50V

0805

D14

BAT42WS-V

69.8K

0805

FG1

JP2

OFF

D15

BAT42WS-V

R26

249

R11

127k

R36

100k

590K

0805

VS2

JP1

30mV

RHYS

HYS

R10

1.05M

0805

C11

1uF

50V

SMBJ26CA

VS1

OPT

2220

OPT

2220

R12

69.8K

0805

OPT

2220

E7 VALID1

UV2

C17

0.1uF

50V

0805

J4 GND

C10

1uF

50V

R23

249

FG3

UV1

R34

68k

1206

V2 (+5V)

V1 (+12V)

C18

0.1uF

50V

0805

R30

100k

E16

D18

GRN

VOUT

2 1

R28

249

VS3

C19

0.1uF

50V

0805

69.8K

0805

SMBJ26CA

UV3

LTC4417

UV1

OV1

UV2

OV2

OV3

UV3

VS1

VS2

VS3

VOUT

VALID1 7

VALID2 8

VALID3 9

EN 22

SHDN 23

HYS 24

CAS 11

GND

Si7905DN

7 1

3 6

8 5

V3 (+8V)

GND

47uF

50V

SANYO

50CE47BS

FG2

OV2

R35

240

1206

C20

0.047uF

50V

0805

130K

0805

Q10

MMBTA42

2 3

OPT

1206

OPT

1206

OPT

1206

C12

1uF

50V

E8 VALID2

R13

130K

0805

OV1

R32

100k

VOUT

2A MAX

E9 VALID3

OPT

1206

Si7905DN

7 1

3 6

8 5

130K

0805

C21

0.047uF

50V

0805

R31

100k

OV3

dc1717afa

DEMO MANUAL DC1717A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use.Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

schematic Diagram

D D

C C

B B

A A

OPTIONAL CIRCUIT

VOUT POWER SOURCE VALID STATUS

V1 VOUT

V2 VOUT

V3 VOUT

/VALID3

/VALID1

/VALID2

/VALID1

/VALID2

/VALID3

FG3

VS3

VS2

FG2

VS1

FG1

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1717A

Thursday, July 23, 2015 2 2

PRIORITIZED POWERPATH CONTROLLER

N/A LTC4417CUF

KIM T.

VLAD O.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1717A

Thursday, July 23, 2015 2 2

PRIORITIZED POWERPATH CONTROLLER

N/A LTC4417CUF

KIM T.

VLAD O.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1717A

Thursday, July 23, 2015 2 2

PRIORITIZED POWERPATH CONTROLLER

N/A LTC4417CUF

KIM T.

VLAD O.

GND VDD

74HC27PW

7 14

R16

R19

30.9K

D17

GRN

VALID1

R22

MMSZ5231BT1G

5.1V

OPT

D12

GRN

LDO

2 1

R18

115k

OPT

D16

GRN

VALID3

E13 5V

GND VDD

74HC27PW

7 14

GRN

R21

FDD4685

C14

10uF

10V

0805

E14

AUXILIARY VOLTAGE INPUT

6V - 24V

FDD4685

R14

LT3060ETS8-5

GND

ADJ 7

REF/BYP

SHDN

OUT 6

GND

FDD4685

GND VDD

74HC27PW

7 14

C16

10nF

50V

0805

FDD4685

R29

C15

1uF

50V

E15

GND

R15

FDD4685

C13

1uF

50V

R20

R17

845k

OPT

GRN

D10

GRN

D11

GRN

VALID2

FDD4685

dc1717afa

DEMO MANUAL DC1717A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0915 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD)kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use.As such,the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods.As a prototype,this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive,or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund.THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES,EXPRESSED,IMPLIED,OR STATUTORY,INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE.EXCEPT TO THE EXTENT OF THIS INDEMNITY,NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods.Further,the user releases LTC from all claims

arising from the handling or use of the goods.Due to the open construction of the product,it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge.Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product.Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages.For further safety concerns,please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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