Analog Devices DC2747A Quick setup guide

DEMO MANUAL DC2747A

Rev. 0

DESCRIPTION

LTC3315A

Dual 5V, 2A Synchronous Step-Down

DC/DCs in 2mm × 2mm LQFN

Demonstration Circuit DC2747A features the LTC

3315A

dual 5V, 2A Synchronous Step-Down DC/DC regulators

operating at 2.0MHz. One regulator provides a 1.2V out-

put and the other provides 1.8V, both up to a 2A load. The

LTC3315A supports adjustable output voltages from 0.5V

to VIN, operating frequencies from 1MHz up to 3MHz. The

LTC3315A is a compact, high efficiency, and high speed

synchronous monolithic step-down switching regulator.

Fast minimum on-time of 25ns enables high VIN to low

VOUT conversion at high frequency.

The DC2747A operating mode may be selected as Burst

Mode operation, Skip mode or Forced Continuous (FC)

mode. Setting JP1 to the FC/SYNC position will allow

the LTC3315A to sync to a clock frequency from 1MHz All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

to 3MHz. The LTC3315A operates in Forced Continuous

mode when syncing to an external clock.

The LTC3315A data sheet gives a complete description

of the device, operation and application information. The

data sheet must be read in conjunction with this demo.

The LTC3315A is assembled in a 2mm × 2mm LQFN pack-

age with exposed pads for low thermal resistance. The

PCB Considerations section in the data sheet.

The Efficiency vs Load graph shows the efficiency and

the power loss of the circuit with a 3.3V input in Burst

Mode operation.

Design files for this circuit board are available.

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Supply Range (VIN) 2.25 5.5 V

Internal Oscillator Frequency (fSW) 1.9 2 2.1 MHz

Top Switch On Time 25 ns

VOUT1 0 to 2A 1.2 V

VOUT2 0 to 2A 1.8 V

680nH

33µF

140k

100k

6.8pF

1µF

1µH

261k

100k

1µF

33µF

6.8pF

SW1

FB1

SW2

FB2

PGOOD

DC2747 F01

EN2

MODE/SYNC

GND

EN1

LTC3315A

VIN

2.25V TO 5.5V

OUT1

1.2V, 2A

OUT2

1.8V, 2A

fSW = 2MHz

10µF

VIN

IOUT (A)

0.00

EFFICIENCY (%)

0.25 1.25 1.50 1.75

2.00

0.50 0.75

DC2747 F02

1.00

1.8 VOUT

1.2 VOUT

DEMO MANUAL DC2747A

Rev. 0

BOARD PERFORMANCE

BOARD PHOTO

IOUT (A)

0.0

1.190

1.195

1.200

1.205

1.210

OUT

(V)

0.5

2.00

1.0

DC2747 F03

1.5

IOUT (A)

0.0

1.790

1.795

1.800

1.805

1.210

OUT

(V)

0.5

2.00

1.0

DC2747 F04

1.5

LTC3315A 1.2V FC MODE

LOAD REGULATION

VIN = 3.3V

LTC3315A 1.8V FC MODE

LOAD REGULATION

VIN = 3.3V

DEMO MANUAL DC2747A

Rev. 0

BOARD PERFORMANCE

1.2V Load Transient Response

Forced Continuous Mode

1.8V Load Transient Forced

Continuous ModeMode

3.3V

IN TO 1.2V

OUT

LOADSTEP 0.4A TO 1.6A 1A/µs

10µs/DIV

SG1

2V/DIV

OUT1

20mV/DIV

RSNS1

50mV/DIV

2747A F05

3.3V

IN TO 1.8VOUT

LOADSTEP 0.4A TO 1.6A 1A/µs

10µs/DIV

SG2

2V/DIV

OUT2

50mV/DIV

RSNS2

50mV/DIV

2747A F06

DEMO MANUAL DC2747A

Rev. 0

QUICK START PROCEDURE

The DC2747A is easy to set up to evaluate the perfor-

mance of the LTC3315A. Refer to Figure 1 and Figure 2

for proper measurement equipment setup and follow the

evaluation procedure below.

NOTE:For accurate VIN, VOUT and efficiency measure-

ments, measure V

at the V

SNSE and GND SNSE turrets

and VOUT at the VOUT SNSE and GND SNSE turrets as illus-

trated as VM1, VM2 and VM3 in Figure 1. When measuring

the input or output voltage ripple, care must be taken to

avoid a long ground lead on the oscilloscope probe.

1. Set the JP2 and JP3 jumpers on the DC2747A board

to the HI position.

2. Set the JP1 jumper on the DC2747A board to the

desired position, BURST for best efﬁciency, FC/SYNC

for lowest ripple, and PS for a compromise between

the two.

3. With power off, connect 0V to 6V, 5A power supply,

PS1, between VIN and GND with a series ammeter and

a voltmeter as shown in Figure 1.

4. Turn on and set the PS1 input power supply to 3.3V

and observe that VOUT1 regulates to 1.2V and VOUT2

regulates to 1.8V.

NOTE:Makesurethattheinputvoltagedoesnotexceed6V.

5. With power off, connect a 0A to 2A load to VOUT1 and

GND with a series ammeter and a voltmeter as shown

in Figure 1.

6. Turn on LOAD1 and slowly increase from 0A to 2A

and observe the output voltage. The output ripple may

also be observed using an oscilloscope with the probe

connected as shown in Figure 2.

NOTE: Measure the output voltage ripple by touching the

probe tip directly across the output turrets or to TP1 as

shown in Figure 2. TP1 is designed for a 50Ω coax cable

to reduce any high frequency noise that might couple into

the oscilloscope probes.

7. Set LOAD1 to 500mA.

8. With power off, connect a second 0A to 2A load to

VOUT2 and GND with a series ammeter and a voltmeter

as shown in Figure 1.

9. Turn on LOAD2 and slowly increase the from 0A to 2A

and observe the output voltage. The output ripple may

also be observed using an oscilloscope with the probe

connected as shown in Figure 2.

10. Momentarily short VOUT1 to ground with a clip lead

and observe that the voltage on PGOOD drops to 0V.

11. To change the operating frequency of the LTC3315A,

an external clock must be used. To do this set the JP1

jumperontheDC2747AboardtotheFC/SYNCposition.

12. Set a pulse generator to output a 0V to 3.3V pulse at

2MHz, 50% duty cycle and connect it to the MODE/

SYNC terminal and GND.

13. Changethefrequencyofthepulsegeneratorfrom2MHz

to 3MHz and observe how observe how the frequency

of SW1 follows the pulse generator.

14. Set LOAD1 greater than 1.0A. With an oscilloscope

probe on SW1, remove the pulse signal to the MODE/

SYNC terminal and observe how the switch frequency

settles from 3MHz back to 2MHz.

15. To test the transient response with a base load, turn

off LOADx (LOAD1 or LOAD2) and add the desired

resistortoproduceaminimumloadbetweenVOUTx and

RSNSx turrets (RL shown on Figure 1). Note that the

total load resistance will be RL plus RSNSx (100mΩ).

16. Adjust a signal generator with a 10ms period, 10%

duty cycle and an amplitude from 1V to 2V to start.

Measure the RSNSx voltage to observe the current,

VRSNSx/100mΩ. Adjust the amplitude of the pulse to

provide the desired transient. Adjust the rising and fall-

ing edge of the pulse to provide the desired ramp rate.

Refer to the following equations, the LTC3315A DC2747A

transient plots and Figure 3.

17. IOUTx = VRSNSx/100mΩ

VRSNSx = VSGx − VGSx

Observe load transient effect on VOUTx

18. Refer to the LTC3315A data sheet for more details on

how the LTC3315A operates.

19. When done, turn off all loads, signal generator and

power supplies.

DEMO MANUAL DC2747A

Rev. 0

QUICK START PROCEDURE

Figure1. Proper Measurement Equipment Setup

Figure2. Measuring Input or Output Ripple

VM1

VM3

VM2

PS1

2.25V-5.5V

AM1

LOAD2

0A-2A

AM3

LOAD1

0A-2A

DC2747A

AM2

O-SCOPE

DEMO MANUAL DC2747A

Rev. 0

QUICK START PROCEDURE

Figure3. Optional Transient Response Circuit

THEORY OF OPERATION

Introduction to the DC2747A

The DC2747A demonstration circuit features the

LTC3315A, a 5V Dual 2A Low voltage Synchronous Step-

Down regulator. The LTC3315A is a monolithic, constant

frequency, current mode step-down DC/DC converter. An

internal oscillator turns on the internal top power switch at

the beginning of each clock cycle. Current in the inductor

then increases until the top switch comparator trips and

turns off the top power switch. If the EN pin is low, the

LT3315A is in shutdown and in a low quiescent current

state. When the EN pin is above its threshold, the switching

regulator will be enabled. Buck 1 and Buck 2 are 180º out

of phase with each other.

The MODE/SYNC pin sets the switching mode to pulse

skip, forced continuous, or burst mode. If an external

1MHz to 3MHz clock is connected to the MODE/SYNC

turret while the JP1 is set to the FC/SYNC position, the

LTC3315A switching frequency will sync to the external

clock while operating in forced continuous mode. See

the LTC3315A data sheet for more detailed information.

The maximum allowable operating frequency is influenced

by the minimum on time of the top switch, the ratio of VOUT

to VIN and the available inductor values. The maximum

allowable operating frequency may be calculated using a

minimum Ton of 45ns in the formula below.

SWMAX =

OUT

INMAX

•Ton

MIN

Select an operating switching frequency below fSWMAX.

The LTC3315A has a requirement that the magnitude of

the ripple current in the output inductor be greater than

0.6A peak to peak. This will determine the maximum

inductor value for the application.

Accurately Measuring Output Ripple of the LTC3315A

With the fast edge rates of the circuit, high frequency

noise can be observed when measuring the output voltage

with 1MΩ terminated oscilloscope probes. To better view

the output ripple with oscilloscopes of 400MHz bandwidth

and above a 50Ω coax cable connected as close to

the output caps as possible should be used with the

DEMO MANUAL DC2747A

Rev. 0

THEORY OF OPERATION

oscilloscope channel terminated to 50Ω at the scope. This

will help to reduce the noise coupling onto and displaying

on the scope. The demo board is set up to solder an

U.FL,RECEPT,ST SMD,0Hz to 6GHz 50Ω connector (TP1)

near the output cap C3 & C4. These pads can also be

used to solder a coax cable or other oscilloscope probe

connector if desired.

The DC2747A uses 3-terminal capacitors, C9 and C10,

on the output to reduce the high frequency spikes that

can be observed with high bandwidth oscilloscopes.

The high frequency spikes are partially attributed to the

interwinding capacitance of the inductor and the voltage

step is partially attributed to the inductance in the output

capacitors. The step can be reduced by choosing low ESL

capacitors as close to the inductor as possible. The high

frequency spikes are reduced with using a small low ESL

3-terminal capacitor with the self-resonant frequency

close to the high frequency spikes. Below is the output

ripple using a 500MHz scope, 50Ω probe measured at

TP1 on without the 3-terminal capacitor populated in C9.

TP1

50Ω PROBE

= 3.3V

OUT1

= 1.2V

OUT

= 2A

C9 = 1nF 3–Terminal Cap

500ns/DIV

OUT1

10mV/DIV

2747A F10

TP2

50Ω PROBE

= 3.3V

OUT2

= 1.8V

OUT2

= 2A

C10 = 1nF 3–Terminal Cap

500ns/DIV

OUT2

10mV/DIV

2747A F11

TP1

50Ω PROBE

= 3.3V

OUT1

= 1.2V

OUT1

= 2A

C9 = Open

500ns/DIV

OUT1

10mV/DIV

2747A F12

DEMO MANUAL DC2747A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C2 CAP., 10µF, X5R, 10V, 10%, 0603 SAMSUNG, CL10A106KP8NNNC

2 2 C3, C4 CAP., 33µF, X5R, 10V, 20%, 0805 TDK, C2012X5R1A336M125AC

3 2 C5, C6 CAP., 6.8pF, C0G/NP0, 50V, ±0.5pF, 0402 AVX, 04025A6R8DAT2A

4 2 C7, C11 CAP., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

5 1 L1 IND., 680nH, FIXED, 20%, 3.5A, 0.033Ω,0806 MURATA, DFE201612E-R68M=P2

6 1 L2 IND., 1µH, POWER, 20%, 2.9A, 48mΩ, 0806 MURATA, DFE201612E-1R0M=P2

7 1 R1 RES., 140kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED

8 2 R2, R4 RES., 100kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED

9 1 R3 RES., 261kΩ, 1%, 1/16W, 0402 VISHAY, CRCW0402261KFKED

10 1 U1 DUAL 5V, 2A SYNCHRONOUS STEP-DOWN DC/DCs IN 12-PINS LQFN LINEAR TECH., LTC3315AEV#PBF

Additional Demo Board Circuit Components

1 1 C8 CAP., 220µF, TANT. POSCAP, 6.3V, 20%, 7343, 18mΩ, TPE PANASONIC, 6TPE220MI

2 2 C9, C10 CAP., 1000pF, X7R, 50V, 20%, 0402, 3-TERM, X2Y EMI FILTER JOHANSON DIELECTRICS,

500X07W102MV4T

3 2 Q1, Q2 XSTR., MOSFET, N-CH, 40V, 35A, PowerPAK 1212-8 VISHAY, SIS434DN-T1-GE3

4 2 R5, R11 RES., 249kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED

5 2 R6, R7 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED

6 1 R8 RES., 10kΩ, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED

7 2 R9, R10 RES., 1MΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED

8 1 R12 RES., 1MΩ, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00JNED

9 2 R13, R14 RES., 0.1Ω, 1%, 1/2W, 1206, SENSE, AEC-Q200 IRC, LRC-LR1206LF-01-R100-F

10 2 R15, R16 RES., 10kΩ, 5%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2GEJ103X

Hardware: For Demo Board Only

1 15 E1, E2, E8, E10-E21 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2308-2-00-80-00-00-07-0

2 6 E3-E7, E9 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0

3 1 JP1 CONN., HDR, MALE, 1 × 4, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000411121

4 2 JP2, JP3 CONN., HDR, MALE, 1 × 3, 2mm, VERT, ST, THT Wurth Elektronik, 62000311121

5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE, 8831

6 0 TP1, TP2 CONN., U.FL, RECEPT, ST SMD, 0Hz to 6GHz 50Ω HIROSE ELECTRIC, U.FL-R-SMT-1(10)

7 3 XJP1-XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm Wurth Elektronik, 60800213421

DEMO MANUAL DC2747A

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

SCHEMATIC DIAGRAM

D D

C C

B B

A A

REVISION HISTORY

ECO REV DESCRIPTION APPROVED DATE

-4 PRODUCTION MM 10-07-19

1.2V

2.25V - 5.5V

BURST

FC/SYNC

SKIP

MODE/SYNC

GND

EN1

PGOOD

MODE/SYNC

EN1

VIN

GND

VOUT1

GND

EN2

1.8V

VOUT2

GND

PCA ADDITIONAL PARTS

NOTES: UNLESS OTHERWISE SPECIFIED

1. RESISTORS: OHMS, 0402, 1%, 1/16W

2. CAPACITORS: 0402

SG1

20V MAX

SG2

20V MAX

RSNS1 RSNS2

OPTIONAL TRANSIENT RESPONSE CIRCUIT

VOUT1 VOUT2

VOUT1

SNSE

VOUT2

SNSE

GND1

SNSE

GND2

SNSE

GND

SNSE

VIN

SNSE

VIN

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

NJC

LTC3315A

DUAL 5V, 2A SYNCHRONOUS STEP-DOWN DC/DCs IN 2x2 LQFN

DEMO CIRTCUIT DC2747A 04

10-07-19

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

NJC

LTC3315A

DUAL 5V, 2A SYNCHRONOUS STEP-DOWN DC/DCs IN 2x2 LQFN

DEMO CIRTCUIT DC2747A 04

10-07-19

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

NJC

LTC3315A

DUAL 5V, 2A SYNCHRONOUS STEP-DOWN DC/DCs IN 2x2 LQFN

DEMO CIRTCUIT DC2747A 04

10-07-19

E12

E14

MP3 STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm)

140k

R15

10k

20 E5

R13

0.1

1206

1/2W

JP1

10k

R11

249k

JP2

33uF

0805

1uH

DFE201612E-1R0M=P2

C11

1uF

0201

10uF

0603

LTC3315A-LQFN

EN1

SW1 11

FB1 2

MODE/SYNC

FB2 3

PGOOD

VIN

PGND

EN2

VIN

SW2 6

PGND

6.8pF

E21

SIS434DN-T1-GE3

1000pF

100k

TP2

JP3

33uF

0805

249k

LB1 LABEL

C10

1000pF

MP2 STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm)

STNCL1 TOOL, STENCIL, 700-DC2747A REV04

R16

10k

R12

MP4 STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm)

TPA2

E11

680nH

DFE201612E-R68M=P2

E19

SIS434DN-T1-GE3

R14

0.1

1206

1/2W

E17

E16

TPB1

1uF

0201

220uF

6TPE220MI

R10

E15

PCB1 PCB, DC2747A REV04

E20

E13

E10 R3

261k

TPA1

10uF

0603

MP1 STANDOFF,NYLON,SNAP-ON,0.25" (6.4mm)

TP1

100k

TPB2

E18

SW1 VOUT1

SW2 VOUT2

VOUT1 VOUT2

DEMO MANUAL DC2747A

Rev. 0

 ANALOG DEVICES, INC. 2020

01/20

www.analog.com

ESD Caution

ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

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