EVAL-LT8604-AZ - ANALOG DEVICES

DEMO MANUAL

EVAL-LT8604-AZ

Rev. 0

DESCRIPTION

LT8604

High Efficiency 42V, 120mA

Synchronous Buck Regulator

Demonstration circuit EVAL-LT8604-AZ features the

8604, a high efficiency 42V, 120mA synchronous step-

down regulator in 10-Lead 3mm × 2mm side-wettable

DFN package. The demo board is designed for 120mA

at 5V output from a 5.9V to 42V input, with switching

frequency of 0.7MHz. The wide input range allows a vari-

ety of input sources, such as automotive batteries and

industrial supplies.

The LT8604 is a compact high efficiency, and high fre-

quency synchronous monolithic step-down switching

regulator. The regulator is featured with ultralow 2.5μA

quiescent current with the output in full regulation, mak-

ing it an ideal solution for applications requiring highest

efficiency at very light load currents, such as automotive

and battery powered portable instruments.

Peak current mode control with minimum on-time of as

small as 35ns allows high step-down conversion even at

high frequency. The LT8604 switching frequency can be All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

programmed via an oscillator resistor over a 200kHz to

2.2MHz range. The default frequency of the evaluation

board is 700kHz.

The demo board has an EMI filter installed. The EMI per-

formance of the board is shown on Figure2. The red line

in Radiated EMI Performance is CISPR25 Class 5 peak

limit. The figure shows that the circuit passes the peak

limit test from 30MHz to 1GHz, with a wide margin.

The LT8604 data sheet gives a complete description

of the part, operation and application information. The

data sheet must be read in conjunction with this demo

manual. The layout recommendations for best thermal

performance are available in the data sheet Application

Information section. Contact ADI applications engineer

for technical support.

Design files for this circuit board are available.

Specifications are at TA = 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN_EMI Input Supply Range with EMI Filter 5.9 42 V

VOUT Output Voltage 4.85 5 5.15 V

IOUT Maximum Output Current 120 mA

fSW Switching Frequency 700 kHz

EFF Typical efficiency VIN = 12V, IOUT = 60mA 93 %

DEMO MANUAL

EVAL- LT8604-AZ

Rev. 0

QUICK START PROCEDURE

Demonstration circuit EVAL-LT8604-AZ is easy to set

up to evaluate the performance of the LT8604. Refer to

Figure1 for proper measurement equipment setup and

follow the procedure below:

1. With power off, connect the DC power supply to VEMI

and GND, and load from VOUT to GND.

2. Turn on the power at the input. Make sure that the input

voltage does not exceed 42V.

3. Check for the proper output voltage (5V). If there is no

output, temporarily disconnect the load to make sure

that the load is not set too high or is shorted.

4. Once the proper output voltage is established, adjust

the load within the operating ranges and observe the

output voltage regulation, ripple voltage, efﬁciency and

other parameters.

Figure1. Proper Measurement Equipment Setup

DEMO MANUAL

EVAL- LT8604-AZ

Rev. 0

QUICK START PROCEDURE

Figure2. Radiated EMI Performance, CISPR 25, Peak Limit. VIN = 14V. fSW = 0.7MHz

Figure3. Efficiency. VIN = 12V, 24V, 36V. fSW = 0.7MHz

Efficiency at VOUT = 5V

= 12V

= 24V

= 36V

= 700kHz

LOAD CURRENT (mA)

100

120

100

EFFICIENCY (%)

eval-lt8604-az F03

FREQUENCY (MHz)

AMPLITUDE (dBµV/m)

eval-lt8604-az F02

0 500 900300 700

1000

400 800200 600100

–5

EVAL-LT8604-AZ DEMO BOARD

(WITH EMI FILTER INSTALLED)

CONDITIONS SPECIFIED

LT8604: HORIZONTAL POLARIZATION PEAK DETECTOR

CLASS 5 PEAK LIMIT

LT8604

DEMO MANUAL

EVAL- LT8604-AZ

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 22µF, ALUM. ELECT., 63V, 20%, 6.3mm × 7.7mm,

CE-BS

SUN ELECTRONIC INDUSTRIES CORP, 63CE22BS

2 3 C13, C3, C10 CAP., 0.22µF, X7R, 50V, 10%, 0603, AEC-Q200 MURATA, GCM188R71H224KA64D

3 1 C4 CAP., 0.22µF, X7R, 16V, 10%, 0603 AVX, 0603YC224KAT2A

4 1 C6 CAP., 10µF, X5R, 6.3V, 20%, 0603 MURATA, GRM188R60J106ME47D

5 1 C7 CAP., 1µF, X7R, 16V, 10%, 0603 KEMET, C0603C105K4RAC7867

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

7 1 C9 CAP., 4.7µF, X5R, 6.3V, 10%, 0603 KEMET, C0603C475K9PACTU

8 1 FB1 IND., 300Ω, FERRITE BEAD, 25%, 250mA, 0402, AEC-Q200 MMZ1005Y301CTD25

9 1 L1 IND., 100µH, PWR, SHIELDED, 20%, 0.75A, 600mΩ,

4.9 × 4.9 × 3, AEC-Q200

COILCRAFT, LPS5030-104MRB

10 2 R1, R4 RES., 1M, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031M00FKEA

11 1 R2 RES., 60.4kΩ, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF6042V

12 1 R3 RES., 49.9kΩ, 1%, 1/10W, 0603 NIC, NRC06F4992TRF

13 1 R5 RES., 187kΩ, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1873V

14 1 U1 IC, 42V 100mA BUCK REGULATOR, DFN-10 ANALOG DEVICES, LT8604EDDBM#PBF

Additional Demo Board Circuit Components

1 0 C5, C12 CAP., OPTION, 0603

2 0 R6 RES., OPTION, 0603

Hardware: For Demo Board Only

1 10 E1-E10 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 CONN., HDR, MALE, 1 × 3, 2mm, VERT, ST, THT, NO SUBS.

ALLOWED

WURTH ELEKTRONIK, 62000311121

3 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

4 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000

DEMO MANUAL

EVAL- LT8604-AZ

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.

SCHEMATIC DIAGRAM

D D

C C

B B

A A

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

SUNCON

63CE22BS

(700kHz)

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES 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 ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

NAME

LT8604

HIGH EFFICIENCY 42V/120mA SYNCHRONOUS BUCK

EVAL-LT8604-AZ

710-EVAL-LT8604-AZ_REV01

N/A

Friday, October 30, 2020

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES 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 ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

NAME

LT8604

HIGH EFFICIENCY 42V/120mA SYNCHRONOUS BUCK

EVAL-LT8604-AZ

710-EVAL-LT8604-AZ_REV01

N/A

Friday, October 30, 2020

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES 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 ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

NAME

LT8604

HIGH EFFICIENCY 42V/120mA SYNCHRONOUS BUCK

EVAL-LT8604-AZ

710-EVAL-LT8604-AZ_REV01

N/A

Friday, October 30, 2020

22uF

63V

C12

OPT

GND

TR/SS

EN/UV

0.22uF

4.7uF

6.3V

0.22uF

50V

0603

60.4k

JP1

VOUTBIAS

R3 49.9k

C13

0.22uF

50V

GND

C10

0.22uF

0603

50V R1

LT8604EDDB

VIN

EN/UV

BIAS

INTVCC

TR/SS

FB 6

PG 8

SW 2

BST 1

GND

1uF

VOUT

5V/120mA

5.9V - 42V

VEMI

10uF

6.3V

FB1

MMZ1005Y301CTD25

1 2

0.01uF

C5 OPT

OPT

GND

R4 1M

187k

100uH

LPS5030-104MR

1 2

BIAS

VOUT

DEMO MANUAL

EVAL- LT8604-AZ

Rev. 0

 ANALOG DEVICES, INC. 2021

02/21

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.

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