Analog Devices SCP-LT8604C-BEVALZ Quick setup guide

DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

DESCRIPTION

Demonstration circuit SCP-LT8604C-BEVALZ is a high ef-

ficiency 42V, 1 20mA synchronous step-down regulator.

The wide input range also allows inversion if using the

SCP-LT8604C-IEVALZ-version.

Like all boards in the Signal Chain Power series, this board

is designed to be easily plugged into other SCP boards to

form a complete signal chain power system, enabling fast

evaluation of low power signal chains. To evaluate this

board, some universal SCP hardware is required, namely:

SCP-INPUT-EVALZ SCP-1X2BKOUT-EVALZ

SCP-OUTPUT-EVALZ SCP-1X5BKOUT-EVALZ

SCP-F ILT E R -EVALZ SCP-5X1-EVALZ

SCP-THRUBRD-EVALZ

To properly evaluate SCP series demo boards, you will

need the SCP Configurator companion software. SCP

Configurator can help you choose the right board and to-

pology for your design.

Note that this Demo Manual does not cover details im-

portant to the operation and configuration regarding the

LT8604C. Please refer to the LT8604C datasheet for a com-

plete description of the part.

Design files for this circuit board are available

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

Table 1.

Performance Summary

SYMBOL

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

IN(MAX)

Max Input Voltage

OUT(MAX)

Max Output Voltage

OUT(MAX)

Max Output Current

120

BOARD IMAGE

Figure 1.

SCP-LT8604C-BEVALZ Evaluation Board

DEMO MANUAL

SCP-LT8604C-B E VA L Z

Signal Chain Power Series

LT8604C High Efficiency

Synchronous Buck Converter

DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

QUICK START PROCEDURE

Demonstration circuit

SCP-LT8604C-BEVALZ

is easy to

set up to evaluate the performance of any SCP hard-

ware configuration. Refer to

Figure 2 and follow these

steps

1. The SCP-LT8604C-BEVALZ ships with a default output

voltage of 5V. To change the output voltage, see “Con-

figuration Settings” below, and modify the board ac-

cordingly. Be sure to check for open connections or sol-

der shorts after making any modifications.

2. Connect the SCP-INPUT-EVALZ and SCP-OUTPUT-

EVALZ boards to the SCP-LT8604C-BEVALZ (refer to

Figure 2) and connect the input board to a voltage

source, V

SOURCE

. Connect the output board to a volt-

meter or dynamic load. Slowly raise the input voltage

until the SCP-LT8604C-BEVALZ powers into regulation

and sweep V

SOURCE

through the desired range of oper-

ation.

NOTE: Make sure that the input voltage is always within

spec. If using a dynamic load to measure output volt-

age, make sure the load is initially set to zero.

3. Check for proper output voltages. The output should be

regulated at the programmed value (±5%).

4. Once the proper output voltage is established, power

off V

SOURCE

and similarly test other boards in the SCP

system until all elements have been individually verified

prior to assembling into the final circuit configuration.

NOTE: When measuring the input or output voltage rip-

ple, use the optional SMA connector locations available

on the input, output, 1

5, 1

2, and 5

1 breakout

boards. Avoid using the test point connections with

long scope leads.

Figure 2.

Proper Measurement Equipment Setup (Use SMA connectors for Measuring Input or Output Ripple)

DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

CONFIGURATION SETTINGS

Demonstration circuit SCP-LT8604C-BEVALZ is a high ef-

ficiency 42V, 1 20mA synchronous step-down regulator.

The wide input range also allows inversion if using the

SCP-LT8604C-IEVALZ version.

The output of the SCP-LT8604C-BEVALZ is resistor-pro-

grammable from 0.8V to 34V.

OUTPUT VOLTAGE

OUT

V 0.778V 1 R5



= +





For output voltage greater than 25V, disconnect BIAS pin

from output by removing R9.

Table 2.

Resistor selection guide for common output voltages.

OUT

(V)

R4 (Ω)

R5 (Ω)

0.8V

3.24K

115K

0.9V

3.83K

137K

1.0V

102K

357K

1.1V

42.2K

102K

1.2V

102K

187K

1.25V

162K

267K

1.5V

205K

221K

1.8V

1.00M

768K

2.0 V

1.15M

732K

2.5V

1.47M

665K

3.0V

1.02M

357K

3.3V

590K

182K

3.5V

357K

102K

4.0V

422K

102K

4.5V

511K

107K

5.0V

1.02M

187K

5.5V

698K

115K

6.0V

1.13M

169K

6.5V

787K

107K

7.0V

1.50M

187K

7.5V

1.27M

147K

8.0V

1.30M

140K

12.0V

1.47M

102K

16.0V

1.50M

76.8K

20.0V

1.50M

60.4K

24.0V

1.50M

49.9K

25.0V

1.62M

52.3K

28.0V

1.62M

46.4K

30.0V

1.62M

43.2K

34.0V

1.33M

30.9K

ENABLE PIN/UV PIN CONFIGURATION

The EN/UV pin is tied to the optional SCP Run/Sequence

header P1. To create a harness for this function, use Molex

part # 0510650300 with crimp pin # 50212-8000.

To use an active run signal, use the default 1.00M for ei-

ther pull-up or pull-down resistors R1, R6 and R7, short

R11 with 0

Ω

, and use the drive signal from connector P1.

Also, short R12 with 0

Ω

for V

OUT

monitoring.

If precision UVLO operation is desired, program enable di-

vider R1, R6 and R7 such that:

R6 is 10k to 100k, nominal

()

V 1.04V

R1 R6 R7 1.04V

−



=



+



The LT8604C has an accurate 1.04V threshold which

places the part into under voltage lockout. The hysteresis

threshold on the rising edge is typically 40mV and scales

by the factor:

HYST

R1 R6

V 40mV R6

Additional hysteresis may be added with the use of the

HYST pin (LT8604C only) by adding a pull-down resistor

R7 in the HYST pin, forming voltage divider with R1 and

R6.

HYST(TH)

R1 R6

RISING V 1.04V R6

HYST(TH)

R1 R6 R7

FALLING V 1.00V R6 R7

Be aware that the HYST pin cannot be allowed to exceed

its absolute maximum rating of 12V.

IN(MAX)

V 12V

R1 R6 R7



•<





DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

VOLTAGE INPUT-TO-OUTPUT CONTROL (VIOC)

IMPLEMENTATION

To implement the VIOC, set R19 = R13 = 0

Ω

and refer to

the configuration sheet for the VIOC for the V

LDOOUT

volt-

age configuration values (set on the LDO board), and use

the following configuration for this board:

Table 3.

VIOC Reference Designation

VIOC SETTING REFS

BOT

TOP

MAX

VOUT Refs

BOT TOP

LDOIN LDOOUT VIOC

BOT

V V V 0.778V R



−==





( )

BOT TOP MAX SINK MAX

MAX LDOIN BOT

RRR

V 0.778V I R



= +





SINK

is the current through R

MAX

, typically 15µA, so R

BOT

should be sized such that the divider current runs a mini-

mum of 100µA to minimize the I

SINK

error term.

FREQUENCY PIN CONFIGURATION

The LT8604C allows the user to program an operating fre-

quency by a single resistor. The default operating fre-

quency is 2.0MHz. Note that changing the switching fre-

quency may affect other parameters and likely necessitate

a change in inductor and compensation component val-

ues. Contact the SCP team for applications support if

shifting the switching frequency greater than ±10%.

Table 4.

Resistor Selection Guide for Switching Frequency Setting

(Ω) f

(Ω)

200kHz

221k

1.30MHz

30.1k

300kHz

143k

1.40MHz

27.4k

400kHz

110k

1.50MHz

25.5k

500kHz

86.6k

1.60MHz

23.7k

600kHz

71.5k

1.70MHz

22.1k

700kHz

60.4k

1.80MHz

20.5k

800kHz

52.3k

1.90MHz

19.1k

900kHz

46.4k

2.00MHz

18.2k

1.00MHz

40.2k

2.10MHz

16.9k

1.10MHz

36.5k

2.20MHz

16.2k

1.20MHz

33.2k

DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

PARTS LIST

ITEM

QTY

REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

PCB

ANALOG DEVICES 08_065090a

CAP ALUM ELECT 22uF 63V 20% 6.3X7.7mm

UNITED CHEMI CON EMVE630ADA220MF80G

CAP CER 1uF 50V 10% X7R 1206

YAGEO CC1206KKX7R9BB105

CAP CER 0.1uF 50V 10% X7R 0603

SAMSUNG CL10B104KB8NNNC

CAP CER 10pF 50V 5% C0G 0603

SAMSUNG CL10C100JB8NNNC

CAP CER 10uF 50V 20% X5R 1206

SAMSUNG CL31A106MBHNNNE

CAP CER 0.01uF 50V 10% X7R 0603

YAGEO CC0603KRX7R9BB103

CAP CER 4.7uF 50V 10% X7R 1206

SAMSUNG CL31B475KBHNNNE

INPUT

CONN-PCB MALE HEADER 3POS 2.54MM PITCH R/A GOLD

SULLINS PBC03SBAN

CONN-PCB STRAIGHT SMA PCB DIE CAST (Note 1)

TE CONNECTIVITY LTD 5-1814832-2

IND SHIELDED POWER, 33uH 0.66OHM DCR 0.42A

WURTH ELEKTRONIK 744031330

OUTPUT

CONN FEMALE 3POS 2.54MM PITCH R/A GOLD

SULLINS PPPC031LGBN-RC

CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY

STRAIGHT 2MM PITCH (Note 1)

MOLEX 53253-0370

RES SMD 1MEG Ohm 5% 1/8W 0805

YAGEO RC0805JR-071ML

R6, R7, R10, R11,

R12, R13, R19, R20,

R21, R22

DO NOT INSTALL (Note 1)

TBD0805

R14, R15, R16

RES SMD 0 Ohm 3/4W 0612

VISHAY RCL06120000Z0EA

R17, R18

RES SMD 0 Ohm 3/4W 0612 (Note 1)

VISHAY RCL06120000Z0EA

RES SMD 18.2K Ohm 1% 1/8W 0805

PANASONIC ERJ-6ENF1822V

RES SMD 49.9K Ohm 1% 1/10W 0603

PANASONIC ERJ-3EKF4992V

RES SMD 1MEG Ohm 1% 1/8W 0805

PANASONIC ERJ-6ENF1004V

RES SMD 187K Ohm 1% 1/8W 0805

PANASONIC ERJ-6ENF1873V

R8, R9

RES SMD 0 Ohm JUMPER 1/8W 0805 (Note 2)

VISHAY CRCW08050000Z0EA

IC-ADI HIGH EFFICIENCY 42V/120MA SYNCHRONOUS BUCK

ANALOG DEVICES LT8604CEV#TRPBF

VIOC

CONN FEMALE 2POS 2.54MM PITCH R/A GOLD

SULLINS PPPC021LGBN-RC

Note 1.

These items are not stuffed (DNI).

Note 2.

Keep R9 stuffed for output voltages of 3.3V to 25V.

DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

SCHEMATIC DIAGRAM

LT8604C BUCK

2 2

: LT8604

Pr oduc t ( s) : LT8604

HW TYPE : Cus t omer Eval uat i on

1: 1

02_065090

A SERQUI NA

DNI

LT8 604 CEV#TRPBF 49. 9K

DNI

53 253 - 03 70

5- 1 814 83 2- 2

DNI

50 V

DNI

50 V 50V

4. 7 UF10 UF1MEG

DNI

33 UH

DNI

10 PF

DNI

22 UF

DNI

1MEG

50 V 50V

1UF

DNI

PBC03 SBAN PPPC031LGBN- RC

63 V

18 7K

DNI

PPPC021LGBN- RC

DNI

18 . 2K

0. 1 UF

0. 0 1UF

R22

R19

TP1

R10 R5

R20

R21

R12

R11

INPUT

OUTPUT

VIOC

R13

R14

R16

R17

R15

R18

SYNC

VI OC

VNEG

RUN

SYNC

RUN

VO+

VNEG

V+

VI OC

GND

VNEG VO-

GND

VO-

VO+

VNEG

GND

DNC

BIAS

SYNC/MODE

TR/SS

HYST

EN/UV

VIN

THISDRAWINGIS THE PROPERTYOF ANALOGDEVICESINC.

INPART, OR USEDIN FURNISHINGINFORMATIONTO OTHERS,

ORFOR ANY OTHERPURPOSEDETRIMENTALTO THEINTERESTS

THEEQUIPMENTSHOWNHEREON MAYBE PROTECTEDBY PATENTS

ITIS NOT TO BE REPRODUCEDORCOPIED, INWHOLE OR

DRAWING NO.

SCALE

SIZE

REV

SHEET

APPROVED

DESCRIPTION

REVISIONS

OL G

OWNEDOR CONTROLLEDBYOWNEDANALOG DEVICES.

OFANALOGDEVICES.

SCHEMATIC

PTD ENG INEER

DESIGN V IEW

REV DATE

DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

DEMO MANUAL SCP-LT8604C-B E VA L Z

Rev. 0

11/21

www.analog.com

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