Linear Technology LT8609 User manual

dc2195bf

DEMO MANUAL DC2195B

DESCRIPTION

LT8609/LT8609A

42V, 2A Micropower Synchronous

Step-Down Regulator

Demonstration circuit 2195B is a 42V, 2A micropower

synchronous step-down regulator featuring the LT8609/

LT8609A. There are two assembly versions. DC2195B-A

is for the LT8609A and DC2195B-B is for the LT8609.

The difference is the LT8609A has slower edge speeds

for improved EMI at the expense of a small efficiency loss.

The demo board is designed for 5V output from a 5.5V to

42V input. The wide input range allows a variety of input

sources, such as automotive batteries and industrial sup-

plies. The LT8609/LT8609A is a compact, high efficiency,

high speed synchronous monolithic step-down switching

regulator that consumes only 2.5μA of quiescent current

when output is regulated at 5V. Top and bottom power

switches,compensationcomponentsandother necessary

circuits are inside of the LT8609 to minimize external

components and simplify design.

The SYNC pin on the demo board is grounded by default

for low ripple burst mode operation. Move JP1 to PULSE

SKIPPINGpositioncanchangethe operationmodeto pulse-

skipping operation. Once JP1 is on SPREAD SPECTRUM

position, VCC is applied to the SYNC pin for low EMI spread 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.

PERFORMANCE SUMMARY

spectrum operation. To synchronize to an external clock,

move JP1 to SYNC and apply the external clock to the

SYNC turret. Figure 1 shows the efficiency of the circuit.

The demo board has an EMI filter installed. Under spread

spectrum operation, the radiated EMI performances of

the board (with EMI filter) are shown in Figures 2 and

3. The red lines in Figures 2 and 3 are CISPR25 Class 5

peak limit. To use the EMI filter, the input should be tied

to VEMI, not VIN. An inductor L2, which is a 0Ω jumper

on the board by default now, can be added in the EMI filter

to further reduce the conducted emission.

This board is suitable for a wide range of automotive,

telecom,industrial, andothergeneral purposeapplications.

The LT8609/LT8609Adata sheet gives a complete descrip-

tion of the part, operation and application information. The

data sheet must be read in conjunction with this demo

manual for DC2195B.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2195B

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 5.5 42 V

VOUT Output Voltage 4.8 5 5.2 V

IOUT Maximum Output Current 2 A

fSW Switching Frequency 1.85 2 2.15 MHz

EFE (LT8609A) Efficiency for DC2195B-A VIN = 12V, IOUT = 1A 92.1 %

EFE (LT8609) Efficiency for DC2195B-B VIN = 12V, IOUT = 1A 92.9 %

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dc2195bf

DEMO MANUAL DC2195B

QUICK START PROCEDURE

DC2195B is easy to set up to evaluate the performance of

theLT8609/LT8609A.Refer toFigure4 for propermeasure-

ment equipment setup and follow the procedure below:

NOTE: When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. See Figure 5 for the proper scope

technique.

1. Set an input power supply that is capable of 42V/2A.

Then turn off the supply.

2. Withpower off, connect thesupply to the input terminals

VEMI and GND.

3. Turn on the power at the input.

NOTE: Make sure that the input voltage never exceeds 42V.

4. Check for the proper output voltage of 5V. Turn off the

power at the input.

5. Once the proper output voltage is established, connect

a variable load capable of sinking 2A at 5V to the output

terminals VOUT and GND. Set the current for 0A.

a. If efficiency measurements are desired, an ammeter

can be put in series with the output load in order to

measure the DC2195B’s output current.

b. A voltmeter can be placed across the output terminals

in orderto get an accurateoutput voltage measurement.

6. Turn on the power at the input.

NOTE: If there is no output, temporarily disconnect the

load to make sure that the load is not set too high.

7. Once the proper output voltage is again established,

adjust the load and/or input within the operating range

and observe the output voltage regulation, ripple volt-

age, efficiency and other desired parameters.

8. An external clock can be added to the SYNC terminal

when SYNC function is used (JP1 on the SYNC posi-

tion). Please ensure that the chosen RTsets the LT8609/

LT8609A switching frequency to equal or below the

lowest SYNC frequency. See the data sheet section,

“Synchronization.”

Figure 1. Efficiency vs Load Current at 12V Input 2MHz Switching Frequency

IOUT (A)

EFFICIENCY (%)

100

50 1.5

DC2195 F01

210.5

LT8609A

LT8609

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dc2195bf

DEMO MANUAL DC2195B

QUICK START PROCEDURE

Figure 2. LT8609A Demo Circuit EMI Performance in CISPR25 Radiated Emission Test (VIN = 14V, VOUT =

5V, IOUT = 2A, 2MHz Switching Frequency)

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dc2195bf

DEMO MANUAL DC2195B

QUICK START PROCEDURE

Figure 3. LT8609 Demo Circuit EMI Performance in CISPR25 Radiated Emission Test (VIN = 14V, VOUT = 5V,

IOUT = 2A, 2MHz Switching Frequency)

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dc2195bf

DEMO MANUAL DC2195B

QUICK START PROCEDURE

Figure 4. Proper Measurement Equipment Setup

Figure 5. Measuring Output Ripple

OUT

GND

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dc2195bf

DEMO MANUAL DC2195B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP., X7R, 4.7µF, 50V, 10%, 1206 MURATA, GRM31CR71H475K

2 1 C4 CAP., X7R, 0.22µF, 16V, 10%, 0603 AVX, 0603YC224KAT2A

3 1 C5 CAP., C0G, 10pF, 25V, 5%, 0603 AVX, 06033A100JAT2A

4 1 C6 CAP., X7R, 47µF, 10V, 10%, 1210 MURATA, GRM32ER71A476KE20L

5 1 C7 CAP., X7R, 1.0µF, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D

6 1 C8 CAP., X7R, 0.01µF, 16V, 10%, 0603 AVX, 0603YC103KAT2A

7 1 L1 IND., 2.2µH COILCRAFT, XFL4020-222MEC

8 1 R2 RES., CHIP, 18.2k, 1/10W, 1%, 0603 VISHAY, CRCW060318K2FKEA

9 1 R3 RES., CHIP, 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA

10 2 R1, R4 RES., CHIP, 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA

11 1 R5 RES., CHIP, 187k, 1/10W, 1%, 0603 VISHAY, CRCW0603187KFKEA

DC2195B-A Version Specific Components

1 1 U1 IC, REGULATOR, MSE10 LINEAR TECH., LT8609AEMSE#PBF

DC2195B-B Version Specific Components

1 1 U1 IC, REGULATOR, MSE10 LINEAR TECH., LT8609EMSE#PBF

Additional Demo Board Circuit Components

1 1 C1 CAP., ALUM 22µF, 63V SUN ELECT, 63CE22BS

2 2 C3, C10 CAP., X7R, 4.7µF, 50V, 10%, 1206 MURATA, GRM31CR71H475K

3 1 C9 CAP., X7R, 4.7µF, 16V, 10%, 0805 MURATA, GRM21BR71C475K73L

4 1 C11 CAP., X7R, 1µF, 50V, 10%, 0805 TDK, C2012X7R1H105K

5 2 C12, C13 CAP., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D

6 1 FB1 FERRITE BEAD 0805 TDK, MPZ2012S221A

7 1 L2 RES., CHIP, 0Ω, 3/4W, 2010 VISHAY, CRCW20100000Z0EF

8 0 R6 (OPT.) RES., 0603

Hardware: For Demo Board Only

1 9 E1-E9 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 E10 (OPT.) TESTPOINT, TURRET, 0.094"

3 1 JP1 DOUBLE ROW HEADER 2 ×4 0.079" SULLINS NRPN042PAEN-RC

4 1 XJP1 SHUNT, 0.079" CENTER SAMTEC 2SN-BK-G

5 4 MH1-MH4 STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8833 (SNAP ON)

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dc2195bf

DEMO MANUAL DC2195B

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

C C

B B

A A

ALL CAPACITORS ARE 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

SUNCON

63CE22BS

(2MHz)

SYNC

SPREAD SPECTRUM

PULSE SKIPPING

BURST

FOR ASSEMBLY

VERSIONS

DC2195B-A LT8609AEMSE

DC2195B-B LT8609EMSE

VOUT

VCC

18.2k

EN/UV

SYNC

GND

2.2µH

XFL4020-222MEC

22µF

63V

1.00M

47µF

10V

1210

TR/SS

C11

1µF

50V

0805

0.01µF

0.22µF

C10

4.7µF

50V

1206

49.9k

E8 PG

1µF

(Opt)

VOUT

5V / 2A

JP1

1 2

GND

0 2010

1.00M

187k C5

10pF

VEMI

5.5V - 42V

4.7µF

50V

1206

C13

0.1µF

50V

4.7µF

50V

1206

FB1

U1 *

VIN

EN/UV

SYNC

VCC

TR/SS

FB 6

PG 8

SW 2

BST 1

GND

C12

0.1µF

50V

4.7µF

16V

0805

GND

E10

VIN

5.5V - 42V

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dc2195bf

DEMO MANUAL DC2195B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2016

LT 0216 REV B • 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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