Linear Technology LTC3118EUFD Quick setup guide

dc2045af

DEMO MANUAL DC2045A

Description

LTC3118EUFD

18V, 2A Buck-Boost DC/DC Converter

with Low-Loss Dual Power Path

Demonstration Circuit 2045A featuring the LTC3118 is a

dual input fixed frequency synchronous buck-boost con-

verterwithanintelligentintegratedlow-lossPower-Path™.

The unique all N-Channel architecture provides efficient

operation from either input source to a programmable

output voltage above, below or equal to the input. Volt-

age capability of up to 18V provides flexibility and voltage

margin for a variety of applications and power sources.

The LTC3118 uses a low noise, current mode architecture

with a fixed 1.2MHz PWM mode frequency that minimizes

the solution footprint. For high efficiency at light loads,

automatic Burst Mode™ operation can be selected con-

suming only 50μA of quiescent current in sleep.

TypicalefficienciesforbothBurstModeandfixedfrequency

are shown in Figure 1. JP2 in the FIXED FREQ position

results in low output ripple but also lower efficiency at

light loads. Moving the JP2 position to AUTOBURST

enables Burst Mode operation which improves efficiency

at light load.

L, LT, LTC, LTM, Burst Mode, 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

System level features include selectable IDEAL DIODE

Mode (shown in Figure 2) or PRIORITY mode operation

(shown in Figure 3)

The system can be monitored through V1GD, V2GD and

PGD (power good) indicators There are accurate RUN

comparators to program independent UVLO thresholds,

and outputdisconnect in shutdown. Other features include

2μA shutdown current, short-circuit protection, soft-start,

inductor current limit and thermal overload protection.

The DC2045A circuit has excellent transient load response

in both fixed frequency and automatic Burst Mode opera-

tion as shown in Figures 4 and 5.

The LTC3118 data sheet has detailed information about

the operation, specifications, and applications of the part.

The data sheet should be read in conjunction with this

Quick Start Guide.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2045A

Specifications are at TA= 25°C

Input Voltage Range: 2.5V to 18.0V

VOUT 5.0V

IOUT 2.0A for VIN > 5.0V

dc2045af

DEMO MANUAL DC2045A

Quick start proceDure

100

1 10 100 1000 10000

EFFICIENCY (%)

LOAD (mA)

VIN=3.3V, BURST MODE

VIN=5V, BURST MODE

VIN=12V, BURST MODE

VIN=3.3V, FIXED FREQ

VIN=5V, FIXED FREQ

VIN=12V, FIXED FREQ

Figure 1. Typical Efficiency as a Function of Input Voltage and Load Current

Figure 3. Transitioning from VIN1 to VIN2 and Back in PRIORITY Mode Operation with VIN2 at 14V

Figure 2. Ideal Diode Mode Operation

VOUT = 100mV/DIV

VOUT DC = 5V

VIN2 = 2V/DIV

VIN2 DC = 8V

VIN1 = 2V/DIV

VIN1 PEAK = 10V

VIN1 VALLEY = 4V

VOUT = 500mV/DIV

VOUT DC = 5V

IIN1 = 500mA/DIV

VIN2 = 14V and is Not Shown on Screen

VIN1 = 2V/DIV

VOLTAGE PEAK = 10V

VOLTAGE VALLEY = 1V

dc2045af

DEMO MANUAL DC2045A

Quick start proceDure

Figure 4. 100mA to 600mA Load Transient with VIN1 = 3.5V in Fixed Frequency Mode

OUTPUT VOLTAGE

OUTPUT CURRENT

Figure 5. 50mA to 600mA Load Transient with VIN1 = 3.5V in Burst Mode

OUTPUT VOLTAGE

OUTPUT CURRENT

dc2045af

DEMO MANUAL DC2045A

Quick start proceDure

Using short twisted pair leads for any power connections

and with all loads and power supplies off, refer to Figure 6

for the proper measurement and equipment setup. The

Power Supplies should not be connected to the circuit

until told to do so in the procedure below.

When measuring the input or output voltage ripple, care

must be taken to avoid a long ground lead on the oscil-

loscope probe.

The indicators for PGD, V1GD and V2GD are negative

logic. PGD indicates the output voltage is good if it is

pulled to ground and V1GD and V2GD indicate that the

input voltage on the respective sources are good if the

pins are pulled to ground.

1. JP1 and JP2 settings to start:

JP1 SELECT = IDEAL DIODE (VCC)

JP2 MODE = FIXED FREQ (VCC)

2. With power OFF connect the power supplies (PS1,

PS2) as shown in Figure 6. If accurate current mea-

surements are desired (for efficiency calculations for

example) then connect the ammeters in series with

the supplies as shown. The ammeters however, are

not required.

3. Connect the load, set at 50Ω, to VOUT as shown in

Figure6.Again, connect an ammeter if accurate current

measurement or monitoring is desired.

4. Turn on the Power Supply, PS1, and slowly increase

the voltage. The converter will start at approximately

2.9V.

5. Verify VOUT is ~5.0V, and that V2GD is pulled high by

VCC and PGD and V1GD are pulled low.

6. PS1 can now be varied between 2.5V and 18.0V. VOUT

will remain in regulation for load currents up to 2 amps

with VIN greater than VOUT. As VIN1 falls below VOUT the

input current may increase to the maximum average

inductor current, depending on the load, which will

then limit the load current and the output voltage.

7. Turn off PS1 and repeat steps 3 to 6 with PS2. The part

will turn on with PS2 at approximately 4.5V. Once on,

PS2 can be varied between 3.8V and 18V. The voltage

measurements of step 5 will change where V1GD will

be at VCC and V2GD will be pulled low. Set the load to

50Ω.

8. Set PS2 to 7V and turn on PS1 slowly increasing the

voltage from 0V to 8V. Note that PS1 starts to supply

the power as the voltage of PS1 exceeds the voltage

on PS2 by at least 400mV.

9. Now decrease the voltage on PS1 and observe that

when the voltage on VIN1 falls below the voltage on

PS2, PS1 stops supplying the power and PS2 takes

over. See Figure 2 for typical performance for steps

8 and 9.

10. Turn off PS1 and PS2. Change the SELECT jumper

(JP1) to VCC (the PRIORITY position). Turn on PS2

and adjust it to 14V.

11. By cycling the voltage on PS1 from 1V to 10V you can

observe the transition of power from PS2 to PS1 and

back as the voltage on VIN1 goes through its startup

(approximately 2.9V) and shutdown (approximately

2.5V)thresholds.Typical response is showninFigure3.

Turn off PS1 and PS2.

Steps 12 and 13 are optional for looking at load step

response if desired.

12. With JP2 in the FIXED FREQ position and PS1 at 3.5V

switch the load from 100mA to 600mA and back. Note

the output voltage response. (Figure 4).

13. With JP2 in AUTOBURST and PS1 at 12V switch the

load from 50 mA to 600 mA and back. Note the output

voltage ripple. (Figure 5). See the data sheet for more

information.

Note: Remove D1 for VOUT > 5V to prevent damage to

the converter.

dc2045af

DEMO MANUAL DC2045A

Quick start proceDure

PS2

PS1

AM2

AM3

VM2

VM1

VM3

10k

AM1

LOAD

PGD

V2GD

V1GD

Figure 6. Measurement Setup

dc2045af

DEMO MANUAL DC2045A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C4 CAP., 22µF, X7R, 25V, 20%, 1812 TDK, C4532X7R1E226M250KC

2 3 C2, C5, C9 CAP., 1µF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E105K080AB

3 0 C3, C6 (OPT) CAP., ALUM., RADIAL, 150µF, 50V, 20% PANASONIC, EEU-FM1H151

4 2 C7, C8 CAP., 47µF, X5R, 10V, 20%, 1812 TDK, C4532X5R1A476M280KA

5 1 C10 CAP., 1800pF, C0G, 50V, 5%, 0603 TDK, CGJ3E2C0G1H182J080AA

6 1 C11 CAP., 22PF, NPO, 25V, 10%, 0603 KEMET, C0603C220K3GACTU

7 2 C12, C13 CAP., CER 0.1µF, 25V, 10%, X7R, 0603 TDK, C1608X7R1E104K

8 2 C14, C17 CAP., CER 0.047µF, 50V, 10%, X7R, 0603 TDK, C1608X7R1H473K080AA

9 2 C15, C16 CAP., 0.01µF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E103K080AA

10 1 C18 CAP., 4.7µF, X5R, 6.3V, 20%, 0603 TDK, C1608X5R0J475M080AB

11 0 C19, C20, C21 (OPT) CAP., OPTION, 0603

12 1 D1 DIODE, SCHOTTKY, 30V, 0.2A, SOD-523F FAIRCHILD SEMI., BAT54XV2

13 1 L1 INDUCTOR, PWR., SHIELED, 3.3µH. XAL 40xx Series COILCRAFT, XAL4030-332MEC

14 1 R1 RES., 402k, 1/16W, 1%, 0402 VISHAY, CRCW0402402KFKED

15 1 R2 RES., 100k, 1/16W, 1%, 0402 VISHAY, CRCW0402100KFKED

16 1 R3 RES., 40.2k, 1/16W, 1%, 0402 VISHAY, CRCW040240K2FKED

17 5 R4, R6, R8, R9, R10 RES., 1M, 1/16W, 1%, 0402 VISHAY, CRCW04021M00FKED

18 1 R5 RES., 715k, 1/16W, 1%, 0402 VISHAY, CRCW0402715KFKED

19 1 R7 RES., 374k, 1/16W, 1%, 0402 VISHAY, CRCW0402374KFKED

20 1 R11 RES., 49.9Ω, 1/16W, 1%, 0402 VISHAY, CRCW040249R9FKED

21 0 R12 RES., OPTION, 0402

22 1 U1 I.C.,18V, 2A BUCK-BOOST DC/DC CONVERTER WITH

LOW-LOSS DUAL INPUT POWERPATH

LINEAR TECHNOLOGY, LTC3118EUFD*PBF

23 12 E1-E12 TP, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

24 2 JP1, JP2 CONN., HEADER, 1×3, 2mm SAMTEC, TMM-103-02-L-S

25 2 XJP1-XJP2 SHUNT, 2mm SAMTEC, 2SN-BK-G

26 4 STAND OFF STANDOFF, NYLON, SNAP-ON, 0.625" KEYSTONE, 8834 (SNAP ON)

27 1 PCB, DC2045A DEMO CIRCUIT 2045A-2

28 2 STENCILS, DC2045A (TOP & BOTTOM) STENCILS, DC2045A-2 - TOP & BOTTOM

dc2045af

DEMO MANUAL DC2045A

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



dc2045af

DEMO MANUAL DC2045A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0315 • 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

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

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

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