Linear Technology DC1973A Quick setup guide

dc1973af

DEMO MANUAL DC1973A

Description

LT8697

USB 5V 2.5A Output, 42V Input Synchronous

Buck with Cable Drop Compensation

Demonstration circuit 1973A is a USB 5V2.5A output, 42V

input synchronous buck with cable drop compensation

featuring the LT

8697. The LT8697 is a compact, high

efficiency, high speed synchronous monolithic step-down

switching regulator designed to power 5V USB applica-

tions. Top and bottom power switches, compensation

components and other necessary circuits are inside of

the LT8697 to minimize external components and simplify

design. A precise output voltage and programmable cable

drop compensation maintain accurate 5V regulation at the

USB socket at the end of a long cable.

The circuit runs at 2MHz to minimize external components

size and to avoid AM band. The demo board has an EMI

filter installed. The conducted EMI performance of the

board is shown on Figure 2. The figure shows the circuit

passes the EN55022 Class B with a wide margin.

When the load current is being drawn from VCABLE, the

load current is limited by the current limit of the LT8697

or by 5.8V limit at VOUT, whichever comes first. The

rated load current of the demonstration circuit is set at

2.1A, enough for all USB applications. If higher voltage or

higher current is needed at VCABLE, refer to application

examples on the data sheet. If VCABLE is not connected

to any load, VOUT can be used to power up a load. VSYS

can also be used to supply a small load.

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

Technology Corporation. All other trademarks are the property of their respective owners.

Whenprobingtheboard,payattentiontoGND and C_GND.

Onthedemonstrationboard,they are connectedtogether by

default through R13 so a user can connect the ground clip

of a probe to C_GND. However, if a user wants to evaluate

an actual cable, the cable will replace R4 and R13. The

copper between pads of R13 should be cut open. In this

case, C_GND is no longer the same as GND. A differential

measurement is needed to probe across the point of load.

The demonstration board also includes a USB socket.

With the proper configuration of jumpers X1, X2, X3 and

X4, the USB can be configured for different applications.

See Table 1 for configurations.

A500mA onboard step load can also be activated to evalu-

ate the load transient response of the circuit. To active the

step load, simply set jumper X5 to V+.

The LT8697 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for demo circuit 1973A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1973A

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dc1973af

DEMO MANUAL DC1973A

Figure 1. LT8697 Demo Circuit EMI Performance, Switching Frequency = 2MHz

Description

Table 1. Configure X1 – X4 for Different USB Applications

X1 X2 X3 X4 J3

Do Not Care Do Not Care Do Not Care OPEN Not in USE

OPEN OPEN SHORT SET USB - DCP

D+ D- OPEN SET USB - APPLE 2.1A

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dc1973af

DEMO MANUAL DC1973A

Quick start proceDure

Demonstration circuit 1973A is easy to set up to evalu-

ate the performance of the LT8697. Refer to Figure 2 and

Figure 3 for proper measurement equipment setup and

follow the procedure below:

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

and GND.

2. Withpower off, connect the load to VCABLE and C_GND.

3. Set X1 to X5 to OPEN positions.

4. Turn on the power at the input.

5. Carefully evaluate other design parameters as needed.

6. If a USB device is to be connected to J3, use Table 1 as

a guide to set X1 to X4 for different USB applications.

The total current provided at J3 and VCABLE should

not exceed 2.1A.

7. Set X5 to V+ if a quick transient test is desirable. The

load step applied to VCABLE is 500mA. Again, make

sure the total load current does not exceed 2.1A during

the test.

performance summary

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 6 42 V

VOUT Output Voltage 4.8 5 5.2 V

Max IOUT Maximum Output Current 2.1 A

fSW Switching Frequency 1.9 2 2.05 MHz

EFE Efficiency at DC IOUT = 2.1A, Measured at VOUT 91 %

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dc1973af

DEMO MANUAL DC1973A

Quick start proceDure

Figure 2. Proper Measurement Equipment Setup

Figure 2. Measure Output Ripple

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dc1973af

DEMO MANUAL DC1973A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 Cap., X7R 4.7µF 50V 10% 1206 TAIYO YUDEN, UMK316BJ475KL-T

2 1 C3 Cap., X5R 0.22µF 16V 10% 0603 TAIYO YUDEN, EMK107BJ224KA-T

3 2 C4, C25 Cap., X7R 47µF 10V 10% 1210 MURATA, GRM32ER71A476KE15L

4 1 C5 Cap., X5R 0.1µF 16V 10% 0402 AVX, 0402YD104KAT2A

5 1 C6 Cap., X7R 1µF 25V 10% 0603 MURATA, GRM188R71E105KA12L

6 1 C13 Cap., X7R 1nF 25V 10% 0402 TDK, C1005X7R1E102K

7 1 R1 Res., Chip 1M 0.06W 1% 0402 VISHAY, CRCW04021M00FKED

8 1 R3 Res., 0.02Ω 0.25W 1% 1206 VISHAY, WSL1206R0200FEA

9 1 R4 Res., Sense, 0.3Ω 2W 1% 0830 SUSUMU, RL7520WT-R30-F

10 2 R6, R22 Res., Chip 100k 0.06W 5% 0402 VISHAY, CRCW0402100KJNED

11 1 R7 Res., Chip 12.4k 0.1W 1% 0603 VISHAY, CRCW060312K4FKEA

12 1 R8 Res., Chip 49.9k 0.06W 1% 0402 VISHAY, CRCW040249K9FKED

13 1 R9 Res., Chip 10k 0.06W 5% 0402 VISHAY, CRCW040210K0JNED

14 1 R10 Res., Chip 16.5k 0.1W 1% 0603 VISHAY, CRCW060316K5FKEA

15 1 U1 I.C., Switching Reg. QFN(24) (UDD) 3MMX5MM LINEAR TECH., LT8697EUDD#PBF

Additional Demo Board Circuit Components

1 1 C1 Cap., Alum 22µF 63V 25% SUN ELECT., 63CE22BS

2 1 C7 Cap., X7R 4.7µF 50V 10% 1206 MURATA, GRM31CR71H475KA12L

3 1 C8 Cap., X7R 4.7µF 50V 10% 1206 TAIYO YUDEN, UMK316BJ475KL-T

4 0 C9 (OPT) Cap., 1206

5 1 C10 Cap., X7R 0.1µF 25V 10% 0603 TDK, C1608X7R1E104K

6 2 C11, C12 Cap., X7R 1µF 25V 10% 0805 TDK, C2012X7R1E105K

7 1 C14 Cap., X7R 2.2nF 10V 10% 0603 AVX 0603ZC222KAT2A

8 3 C15-C17 Cap., X7R 0.1µF 50V 10% 0402 TDK, C1005X7R1H104K

9 1 FB1 Ferrite Bead, 0805 TDK, MPZ2012S221AT

10 1 L1 Inductor, 3.3µH COILCRAFT, XAL5030-332MEC

11 1 L2 Inductor, 4.7µH VISHAY, IHLP2020BZER4R7M01

12 1 Q1 Power Mosfet, SOT23 DIODES INC., ZXMN3A14FTA

13 0 R2, R14 (OPT) Res., 0402

14 2 R5, R23 Res., Power, 18Ω, 1W, 1% 2512 SUSUMU, CPA2512Q18R0FS-T10

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dc1973af

DEMO MANUAL DC1973A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

15 1 R11 Res., Chip, 0Ω, 0.25W, 1206 VISHAY, CRCW12060000Z0EA

16 0 R13 Res., Chip, 1206

17 1 R15 Res., Chip, 75k, 0.1W, 1% 0603 VISHAY, CRCW060375K0FKEA

18 1 R16 Res., Chip, 43.2k, 0.1W, 1% 0603 VISHAY, CRCW060343K2FKEA

19 2 R17, R18 Res., Chip, 49.9k, 0.1W, 1% 0603 VISHAY, CRCW060349K9FKEA

20 1 R19 Res., Chip, 10k, 0.1W, 5% 0603 VISHAY, CRCW060310K0JNEA

21 1 R20 Res., Chip, 2M, 0.1W, 1% 0603 VISHAY, CRCW06032M00FKEA

22 2 R21, R24 Res., Chip, 2Ω, 0.25W, 5% 1206 VISHAY, CRCW12062R00JNEA

23 1 U2 I.C., Oscillator, TSOT-23-S5 LINEAR TECH., LT6900CS5#PBF

Hardware: For Demo Board Only

1 13 E1-E13 Turret, Testpoint MILL-MAX, 2501-2-00-80-00-00-07-0

2 4 E15-E18 Testpoint, Turret, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0

3 5 X1-X5 Headers, Sgl. Row 3 Pins 2mm Ctrs. SULLINS, NRPN031PAEN-RC

4 5 xX1-xX5 Shunt, 2mm Ctrs. SAMTEC, 2SN-BK-G

5 1 J3 USB, Right Angle, Receptacle CnC TECH LLC, 1002-001-01000

6 4 MH1-MH4 Stand-Off, Nylon 0.375" KEYSTONE, 8832(SNAP ON)

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dc1973af

DEMO MANUAL DC1973A

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

ALL CAPACITORS ARE 0402.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0402.

(2MHz)

OPEN SET

OPEN

SHORT

OPEN D-

OPEN D+

OPEN

V+

VCABLEVOUT

GND C-GND

DATA+

DATA-

VSYS VCABLE VCABLE

VSYS

VCABLE

VIN

INTVCC

R19

10k

0603

R19

10k

0603

C17

0.1µF

50V

C17

0.1µF

50V

C11

1µF

25V

0805

C11

1µF

25V

0805

FB1FB1

E5 C_GND

R20

0603

R20

0603

R15

75k

0603

R15

75k

0603

C12

1µF

25V

0805

C12

1µF

25V

0805

10k

LT8697EUDD

VIN

EN/UV

SYNC

RCBL

ICTRL

INTVCC

TR/SS

PGND

N/C

USB5V 20

PG 19

SYS 18

ISN 22

ISP 21

SW 15

SW 14

SW 13

BST 16

GND

4.7µF

50V

1206

4.7µF

50V

1206

E18E18

R21

1206

R21

1206

GND

X4X4

E17E17

VCABLE

5V / 2.1A

VCABLE

5V / 2.1A

1µF

25V

0603

1µF

25V

0603

E10

ICTRL

E10

ICTRL

OPT

10V

1206

OPT

10V

1206

49.9k

R16

43.2k

0603

R16

43.2k

0603

R23

2512

R23

2512

R14

OPT

R14

OPT

R10

16.5k

0603

R10

16.5k

0603

R17

49.9k

0603

R17

49.9k

0603

C10

0.1µF

25V

0603

C10

0.1µF

25V

0603

C25

47µF

10V

1210

C25

47µF

10V

1210

R18

49.9k

0603

R18

49.9k

0603

0.02

1206

0.02

1206

ZXMN3A14F

4.7µF

50V

1206

4.7µF

50V

1206

E9 GND

GND

X3X3

C16

0.1µF

50V

C16

0.1µF

50V

C13 1nFC13 1nF

C14

2.2nF

0603

C14

2.2nF

0603 R24

1206

R24

1206

VIN

6V - 42V

VIN

6V - 42V

22µF

63V

SUNCON

63CE22BS

22µF

63V

SUNCON

63CE22BS C3

0.22µF

16V

0603

0.22µF

16V

0603

R22

100k

R22

100k

X1X1

SYNC

RCBL

4.7uF

50V

1206

4.7uF

50V

1206

R11

1206

R11

1206

100k

E11

X2X2

R13

OPT 1206

R13

OPT 1206

E15E15

12.4k

0603

12.4k

0603

0.3

0830

0.3

0830

2512

OPT

C15

0.1µF

50V

C15

0.1µF

50V

E12 GND

E16E16

3.3µH

XAL5030-332MEC

3.3µH

XAL5030-332MEC

VOUT

5.xV / 2.1A

VOUT

5.xV / 2.1A

X5X5

E13

VSYS

5.xV / 0.1A

E13

VSYS

5.xV / 0.1A

47µF

10V

1210

47µF

10V

1210

0.1µF

USB

LTC6900CS5

V+ 1

OUT 5

GND

DIV

SET

4.7µH

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dc1973af

DEMO MANUAL DC1973A

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 0713 • 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

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