Linear Technology LT8390A Quick setup guide

dc2598af

DEMO MANUAL DC2598A

DESCRIPTION

LT8390A

60V 2MHz Synchronous

Buck-Boost Controller

Demonstration circuit 2598A is a 60V 2MHz synchronous

buck-boost controller featuring the LT

8390A. It accepts

an input voltage from 4V to 24V (with transient to 60V) and

regulates 12V output at up to 4A. DC2598A features high

efficiency and 2MHz switching frequency, a high speed

for a 4-switch buck-boost controller. It has a PGOOD flag,

short-circuit fault protection, ISMON current-monitoring

output signal, and spread spectrum frequency modulation

(SSFM) or frequency synchronization.

The LT8390A has a wide input voltage range from 4V to

60V. It can regulate an output as a boost, a buck, or a

4-switch boost-buck controller. It has adjustable switch-

ing frequency between 600kHz and 2MHz. It has an option

for external frequency synchronization or spread spec-

trum frequency modulation. Its high switching frequency

is unique to buck-boost controller ICs. Because of this, it

can be used for high power when the input may be above,

below, or equal to the output.

DC2598A features an option to turn on spread spectrum

by simply changing the position of a jumper from “NO

SSFM/SYNC” to “SSFM” (or to ”SYNC”).

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

Devices, Inc. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

Small ceramic input and output capacitors are used to

save space and cost. There is a protection diode from

LED+ to GND to prevent negative ringing during a short-

circuit with long wires. Optional EMI input, output, and

gate resistor component placeholders exist when a low

EMI application is needed.

Under voltage lockout can be adjusted with a few resistors

and output voltage can be changed from 12V with FB resis-

tors changes. Please note that higher voltage outputs may

require higher voltage MOSFETs and output capacitors.

The LT8390A data sheet gives a complete description of the

part, operation and applications information. The data sheet

must be read in conjunction with this demo manual for

demonstration circuit 2598A. The LT8390AEUFD is assem-

bled in a 28-lead 4mm × 5mm plastic QFN package with a

thermally enhanced ground pad. LT8390A is also available

in a 28-Lead plastic TSSOP (FE) package. Proper board

layout is essential for maximum thermal performance. See

the data sheet section “Layout Considerations”.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2598A

Specifications are at TA= 25°C

PARAMETER CONDITION MIN TYP MAX

Input Voltage Range Operating 4V 60V

Full Load (4A) Input Voltage Range Component Temp Rise <60°C with No Airflow 7V 23V

Typical Efficiency 12V Input, 12V 4A Output, 2MHz 90%

Switching Frequency R3 = 59.0k 2MHz

Peak Switch Current Limit R1 = 0.005Ω 10A

(AC) Output Ripple 12V Input, 12V 4A Output 70mVP-P

Input Under Voltage Lockout (Falling Turn-Off) R7 = 383k, R8 = 165k 4.0V

Input Under Voltage Lockout (Rising Turn-On) R7 = 383k, R8 = 165k 5.0V

VISMON 12V 4A Output 1.0V

Maximum Load Current 12V Input, 12V Output 4 4.5A

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dc2598af

DEMO MANUAL DC2598A

QUICK START PROCEDURE

Figure1. Test Procedure Setup Drawing For DC2598A

Demonstration circuit 2598A is easy to set up to evaluate

the performance of the LT8390A Follow the procedure

below:

1. With the input power supply off, connect the input

power supply and output load as shown in the test

setup drawing in Figure 1.

2. Connect the EN/UVLO terminal to GND.

3. Make sure that the SSFM jumper is in the correct posi-

tion – either with SSFM turned ON or OFF. Only place

the jumper in the SYNC position if an external SYNC

frequency source is connected to the SYNC pin.

4. Turn the input power supply on and make sure the

voltage is between 4V and 24V for proper steady state

operation.

5. Release the EN/UVLO-to-GND connection.

6. Observe the 12V output voltage, the load current mea-

surement via the ISMON pin voltage and the high effi-

ciency of this small converter.

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dc2598af

DEMO MANUAL DC2598A

Figure2. DC2598A, LT8390A 2MHz Buck-Boost Efficiency 12VOUT

QUICK START PROCEDURE

Figure 3. Recommended Maximum DC Current with No Airflow (for DC2598A)

LOAD CURRENT (A)

2.5

3.5

100

EFFICIENCY (%)

dc2598a F02

0.5

1.5

24VIN

12VIN

VIN (V)

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

IOUT (A)

dc2598a F03

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dc2598af

DEMO MANUAL DC2598A

Figure4. DC2598A, LT8390A Output Ripple Measured at C45

Figure5. DC2598A, LT8390A Bode Plot 12V Input, 12V 4A Output

QUICK START PROCEDURE

Mag [B/A] (dB)

50.000

-50.000

40.000

30.000

20.000

10.000

0.000

-10.000

-20.000

-30.000

-40.000

Phase [B-A] (deg)

150.000

-150.000

120.000

90.000

60.000

30.000

0.000

-30.000

-60.000

-90.000

-120.000

1 kHz 10 kHz 100 kHz 1 MHz

05/16/17 16:58:30

M1 M2 M2 - M1

Frequency 30.57 kHz 367.03 kHz 336.46 kHz

Magnitude -0.000 dB -20.562 dB -20.562 dB

Phase 75.120 deg 0.871 deg -74.249 deg

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dc2598af

DEMO MANUAL DC2598A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 1μF, X7S, 100V, 10%, 0805

2 1 C2 CAP., 4.7μF, X5R, 10V, 10%, 0402 TDK, C1005X5R1A475K050BC

3 1 C3 CAP., 0.47μF, X5R, 16V, 10%, 0402 TAIYO YUDEN, EMK105ABJ474KV-F

4 1 C4 CAP., 2200pF, X7R, 25V,1 0%, 0402 MURATA, GRM155R71E222KA01D

6 1 C5 CAP., 0.022μF, X7R, 25V, 10%, 0402 MURATA, GRM155R71E223KA61D

7 1 C6 CAP., 1μF, X7R, 25V, 10%, 0603 KEMET, C0603C105K3RACTU

5 2 C7, C8 CAP., 0.1μF, X7R, 25V, 10%, 0402 AVX, 04023C104KAT2A

8 1 C10 CAP., 22μF, ALUM, 63V, 20%, SMD 6.3mm × 7.7mm SUN ELECTRONIC INDUSTRIES CORP, 63CE22FS

9 2 C12, C32 CAP., 4.7μF, X7S, 100V, 20%, 1206 AVX, 12061Z475MAT2A

10 3 C14, C20, C45 CAP., 22μF, X5R, 25V, 10%, 1206 MURATA, GRM31CR61E226KE15L

16 2 D1, D2 DIODE, SCHOTTKY, 100V, 250mA, SOD-323F,

AEC-Q101

NXP SEMICONDUCTORS, BAT46WJ

25 1 L1 IND., 1μH, Power Shielded, 20%, 7.3A, 6mm × 5.5mm WURTH ELEKTRONIK, 74437336010

27 2 M1, M2 XSTR., POWER MOSFET, 60V, 40A, TSDSON-8 INFINEON, BSZ065N06LS5ATMA1

29 2 M3, M4 XSTR., POWER MOSFET, 25V, 40A, TSDSON-8 INFINEON, BSZ031NE2LS5ATMA1

31 1 R1 RES., 0.005Ω, ±1%, 1.5W, 3216, AEC-Q200 SUSUMU, KRL3216E-C-R005-F-T1

32 1 R2 RES., 0.01Ω, 1%, 3/4W, 1206, SENSE SUSUMU, KRL1632E-M-R010-F-T5

33 1 R3 RES., 59k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040259K0FKED

34 2 R4, R6 RES., 10k, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKED

35 1 R5 RES., 110k, 1%, 1/16W, 0402 VISHAY, CRCW0402110KFKED

36 1 R7 RES., 383k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402383KFKED

37 1 R8 RES., 165k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402165KFKED

40 1 R11 RES., 100k, 5%, 1/16W, 0402 VISHAY, CRCW0402100KFKED

45 1 U1 IC, 2MHz SYN. BUCK-BOOST CONTROLLER,

28-PIN QFN

LINEAR TECH., LT8390AEUFD#TRPBF

Optional Electrical Components

5 3 C37, C38, C44 CAP., 0.1μF, X7R, 25V, 10%, 0402 AVX, 04023C104KAT2A

11 0 C26, C34, C39 CAP., OPTION, 0402

12 1 C27 CAP., 1μF, X5R, 16V, 10%, 0402 AVX, 0402YD105KAT2A

13 0 C29, C30 CAP., 0805, OPTION

14 0 C33, C40, C41, C42 CAP., OPTION, 1206

15 2 C35, C36 CAP., 0.1μF, X5R, 100V, 10%, 0402 MURATA, GRM155R62A104KE14D

17 1 D3 DIODE, SCHOTTKY, 20V, 1A, SOD-323F NXP SEMICONDUCTORS, PMEG2010EJ

18 0 D4, D5 DIODE, OPTION, SCHOTTKY, SMD

22 0 FB1, FB2, FB3, FB4, FB5, FB6 IND., OPTION, BEAD, FERRITE, 1206

26 0 L2 IND., OPTION, XAL4020 SERIES

30 0 Q1 XSTR., OPTION, PPAK 1212-8

PARTS LIST

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dc2598af

DEMO MANUAL DC2598A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

38 1 R9 RES., 124k, 1%, 1/16W, 0402 VISHAY, CRCW0402124KFKED

39 1 R10 RES., 75k, 1%, 1/16W, 0402 VISHAY, CRCW040275K0FKED

41 0 R12, R20, R21, R25, R28,

R29, R30

RES., OPTION, 0402

42 6 R14, R15, R16, R17, R24, R26 RES., 0Ω, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED

43 2 R18, R19 RES., 10Ω, 5%, 1/16W, 0402 VISHAY, CRCW040210R0FKED

44 0 R22, R23, R27 RES., OPTION, 0805

Hardware

19 4 E1, E2, E9, E10 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

20 6 E3, E4, E5, E6, E7, E8 TEST POINT, TURRET, 0.064", MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0

21 0 E11 TEST POINT, OPTION

23 1 JP1 CONN., HDR, MALE, 2mm × 3,2mm, THT, STR WURTH ELEKTRONIK, 62000621121

24 4 J1, J2, J3, J4 CONN., BANANA JACK, FEMALE, THT, NON-

INSULATED, SWAGE

KEYSTONE, 575-4

28 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.375" WURTH ELEKTRONIK, 702933000

46 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

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dc2598af

DEMO MANUAL DC2598A

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

VIN

4V - 60V

EN/UVLO

GND

ALL CAPACITORS ARE 0402.

NOTE: UNLESS OTHERWISE SPECIFIED

2MHz

ALL RESISTORS ARE 0402.

12V 4A

OUT

PGOOD

ISMON

SYNC

GND

CTRL

OPT EMI FILTER

GND

*SEE DEMO MANUAL

LOADEN

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DC2598A

Tuesday, May 23, 2017 11

60V 2MHz SYNCHRONOUS BUCK-BOOST CONTROLLER

N/A

LT8390AEUFD

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DC2598A

Tuesday, May 23, 2017 11

60V 2MHz SYNCHRONOUS BUCK-BOOST CONTROLLER

N/A

LT8390AEUFD

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DC2598A

Tuesday, May 23, 2017 11

60V 2MHz SYNCHRONOUS BUCK-BOOST CONTROLLER

N/A

LT8390AEUFD

BSZ065N06LS5

383K

FB1

OPT

1206

C20

22uF

1206

25V

C41

R22

OPT

0805

C32

4.7uF

1206

100V

LT8390AEUFD

EN/UVLO 6

PGOOD

TEST

CTRL

LOADEN 8

ISP 11

SYNC/SPRD

LOADTG

VREF

ISMON

LSN 3

LSP 2

ISN 12

FB 16

TG2 22

SW2 23

BG2 25

BG1 26

SW1 28

TG1 1

BST1 27

BST2 24

VIN 4

INTVCC

GND

VOUT 21

R19

110K

C34

OPT

JP1

SSFM ON

SYNC

NO SSFM/SYNC

SYNC/SSFM

C39

OPT

59.0K

10.0K

PMEG2010EJ

OPT

C42

C30

OPT

0805

R11

100K

C27

1uF

OPT

R25

OPT

C45

22uF

1206

25V

R29

OPT

R12

OPT

10K

C10

22uF

63V

63CE22FS

2.2nF

1uF

25V

0603

C14

22uF

1206

25V

22nF

FB2

R14

1.0uH

74437336010

0.005

KRL3216

1 3

2 4

R27

OPT

0805

FB3

R26

1uF

100V

0805

C33

OPT

1206

R28

OPT

R17

R16

R18

4.7uF

10V

C35

0.1uF

0402

100V

FB4

0.1uF

R20

OPT

R10

75.0K

OPT

XEL4020

C37

0.1uF

25V

BSZ031NE2LS5

C26

OPT

FB5

1206

C8 0.1uF

0.47uF R23

OPT

0805

C36

0.1uF

0402

100V

C38

0.1uF

25V

FB6

OPT

E11 OPT

124K

E10

C29

OPT

0805

R15

BAT46WJ

C40

R24

R21

OPT

0.01

1206

BSZ065N06LS5

OPT

R30

OPT

BSZ031NE2LS5

165K

BAT46WJ

C12

4.7uF

1206

100V

C44

0.1uF

25V

ISP

ISN

INTVCC

VREF

INTVCC

LOADTG

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dc2598af

DEMO MANUAL DC2598A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0717 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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