Analog Devices DC2958A Quick setup guide

DEMO MANUAL DC2958A

Rev. 0

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 42 V

VOUT Output Voltage DC2958A-A/DC2958A-B 4.8 5 5.2 V

DC2958A-C 3.168 3.3 3.432

IOUT Maximum Output Current 3 A

fSW Switching Frequency 1.85 2 2.15 MHz

EFF Efficiency for DC2958A-A/DC2958A-B VIN = 12V, IOUT = 1A 92.1 %

Efficiency for DC2958A-C VIN = 12V, IOUT = 1A 89.3 %

DESCRIPTION

LT8609A/09A-5/09A-3.3

42V, 3A Micropower Synchronous

Step-Down Regulator

Demonstration circuit 2958A is a 42V, 3A micro-

power synchronous step-down regulator featuring the

8609A/09A-5/09A-3.3. There are three assembly ver-

sions; DC2958A-A is for the LT8609A adjustable output,

DC2958A-B is for the LT8609A-5 with a fixed 5V output

voltage and DC2958A-C is for the LT8609A-3.3 with a

fixed 3.3V output voltage.

The LT8609A/09A-5/09A-3.3 is a compact, high efficiency,

high speed synchronous monolithic step-down switching

regulator that consumes only 2.5μA of quiescent current.

Top and bottom power switches, compensation compo-

nents and other necessary circuits are inside of the IC to

minimize external components and simplify design.

The SYNC pin on the demo board is grounded by default

for low ripple Burst Mode operation. Moving JP1 to

PULSE SKIPPING position changes the operation mode to

pulse-skipping operation. Once JP1 is placed on SPREAD

SPECTRUM position, VCC is applied to the SYNC pin for

low EMI spread spectrum operation. To synchronous to

an external clock, move JP1 to SYNC and apply the exter-

nal clock to the SYNC turret.

The demo board is designed for 5V or 3.3V output with

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

input sources, such as automotive batteries and industrial

supplies. The minimum input voltage can be as low as 3V

All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

for drop out mode operation. Under this mode, the output

voltage is below the regulation point and follow the input

voltage. To maintain the output under regulation, input

voltage should be above certain value. For DC2958A-A

(adjustable) and DC2958A-B (5V), this value is 5.5V

while 3.8V for DC2958A-C (3.3V). The rated maximum

load current is 3A, while derating is necessary for certain

input voltage and thermal conditions. Figure1 shows the

efficiency of the circuit. Figure2 shows the IC top tem-

perature rising on DC2958A demo board under different

load conditions.

The demo board has an EMI filter installed. The radiated

EMI performances of the board (with EMI filter) are shown

in Figure3 and Figure4. The red lines in Figure3 and

Figure4 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 shorted on the board by default, can be added

in the EMI filter to further reduce the conducted emission.

The LT8609A/09A-5/09A-3.3 data sheet gives a complete

description of the part, operation and application informa-

tion. The data sheet must be read in conjunction with this

demo manual for DC2958A.

Design files for this circuit board are available.

Specifications are at TA= 25°C

DEMO MANUAL DC2958A

Rev. 0

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

Figure2. LT8609A Demo Circuit Case Temperature Rise

QUICK START PROCEDURE

= 12V

LT8609A-5

LT8609A-3.3

LOAD CURRENT (A)

0.5

1.5

2.5

100

EFFICIENCY (%)

DC2958 F01

LT8609A-5 12VIN

LT8609A-3.3 12VIN

LT8609A-5 24VIN

LT8609A-3.3 24VIN

LOAD CURRENT (A)

0.5

1.5

2.5

100

TRISE (°C)

DC2958A F02

DEMO MANUAL DC2958A

Rev. 0

Figure3. LT8609A-5 Demo Circuit EMI Performance in CISPR25 Radiated Emission Test,

(VIN = 14V, VOUT = 5V, IOUT = 2A, 2MHz Switching Frequency)

Figure4. LT8609A-3.3 Demo Circuit EMI Performance in CISPR25 Radiated Emission Test,

(VIN = 14V, VOUT = 3.3V, IOUT = 2A, 2MHz Switching Frequency)

DC2958A–A/ DC2958A–B DEMO BOARD

(WITH EMI FILTER INSTALLED)

14V INPUT TO 5V OUTPUT AT 2A, f

= 2MHz

CLASS 5 PEAK LIMIT

SPREAD SPECTRUM MODE

FIXED FREQUENCY

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–20

–10

AMPLITUDE (dBµV/m)

(CISPR25 Radiated Emission Test with Class 5 Peak Limits)

DC2958 F03

DC2958A–C DEMO BOARD

(WITH EMI FILTER INSTALLED)

14V INPUT TO 3.3V OUTPUT AT 2A, f

= 2MHz

CLASS 5 PEAK LIMIT

SPREAD SPECTRUM MODE

FIXED FREQUENCY

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–20

–10

AMPLITUDE (dBµV/m)

(CISPR25 Radiated Emission Test with Class 5 Peak Limits)

DC2958 F04

QUICK START PROCEDURE

DEMO MANUAL DC2958A

Rev. 0

DC2958A is easy to set up to evaluate the performance of

the LT8609A/09A-5/LT8609A/09A-3.3. Refer to Figure5

for proper measurement 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6 for the proper

scope technique.

1. Set an input power supply that is capable of 42V/3A.

Then turn off the supply.

2. With power off, connect the supply to the input termi-

nals VIN 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. Turn off the power

at the input.

5. Once the proper output voltage is established, connect

a variable load capable of sinking 3A to the output ter-

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

a. If efficiency measurements are desired, an amme-

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

to measure the DC2958A’s output current.

b. A voltmeter can be placed across the output ter-

minals in order to get an accurate output 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 termi-

nal when SYNC function is used (JP1 on the SYNC

position). Please ensure that the chosen RT sets the

LT8609A/09A-5/09A-3.3 switching frequency to equal

or below the lowest SYNC frequency. See the data

sheet section, “Synchronization.”

QUICK START PROCEDURE

DEMO MANUAL DC2958A

Rev. 0

Figure5. Proper Measurement Equipment Setup

OUT

GND

Figure6. Measuring Output Ripple

QUICK START PROCEDURE

DEMO MANUAL DC2958A

Rev. 0

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, 0.1μF, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D

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

DC2958A-A Version Specific Components

1 1 U1 IC, REGULATOR, DDM-10 ANALOG DEVICES, LT8609AEDDM#PBF

2 1 C5 CAP., C0G, 10pF, 25V, 5%, 0603 AVX, 06033A100JAT2A

3 1 R4 RES., CHIP, 1MΩ, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA

4 1 R5 RES., CHIP, 187k, 1/10W, 1%, 0603 VISHAY, CRCW0603187KFKEA

DC2958A-B Version Specific Components

1 1 U1 IC, REGULATOR, DDM-10 ANALOG DEVICES, LT8609AEDDM-5#PBF

2 0 C5 (OPT.) CAP., 0603

3 1 R4 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

4 0 R5 (OPT.) RES., 0603

DC2958A-C Version Specific Components

1 1 U1 IC, REGULATOR, DDM-10 ANALOG DEVICES, LT8609AEDDM-3.3#PBF

2 0 C5 (OPT.) CAP., 0603

3 1 R4 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

4 0 R5 (OPT.) RES., 0603

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 1 R1 RES., CHIP, 1MΩ, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA

9 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)

PARTS LIST

DEMO MANUAL DC2958A

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.

SUNCON

63CE22BS

(2MHz)

SYNC

SPREAD SPECTRUM

PULSE SKIPPING

BURST

FOR ASSEMBLY

VERSIONS

LT8609AEDDM

DC2958A-B

DC2958A-C

LT8609AEDDM-5

LT8609AEDDM-3.3

0 OHM

187k

OPT

10pF

OPT

VOUT

3.3V

DC2958A-A

VCC

18.2k

EN/UV

OPT

1 2

SYNC

GND

2.2uH

XFL4020-222MEC

1 2

22uF

47uF

10V

1210

TR/SS

C11

1uF

50V

0805

0.01uF

0.1uF

C10

4.7uF

50V

1206

R3 49.9k

E8 PG

1uF

R6 OPT

VOUT

/ 3A

JP1

1 2

3 4

5 6

7 8

GND

VEMI

3V - 42V

4.7uF

50V

1206

C13

0.1uF

50V

4.7uF

50V

1206

FB1

MPZ2012S221AT000

1 2

VIN

EN/UV

SYNC

VCC

TR/SS

FB 6

PG 8

SW 2

BST 1

GND

C12

0.1uF

50V

4.7uF

16V

0805

GND

E10

VIN

3V - 42V

VOUT

SCHEMATIC DIAGRAM

DEMO MANUAL DC2958A

Rev. 0

 ANALOG DEVICES, INC. 2020

08/20

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.

Legal Terms and Conditions

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conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation

Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)

and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to

Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and

agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted

is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third

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NOT sold to Customer;all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all

be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of

use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile

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