LT8686S

26

Rev. 0

For more information www.analog.com



ANALOG DEVICES, INC. 2022

11/22

www.analog.com

RELATED PARTS

TYPICAL APPLICATION

PART NUMBER DESCRIPTION

COMMENTS

LT8601

42V, 94% Efficiency, 2.2MHz Triple Output (1.5A + 2.5A + 1.8A)

Synchronous Micropower Step-Down DC/DC Converter with IQ = 30μA

VIN: 3V to 42V, VOUT(MIN) = 0.8V, IQ = 30µA, ISD < 25µA,

6mm × 6mm QFN-40 Package

LT8602

42V, Quad Output (2.5A + 1.5A + 1.5A + 1.5A) 95% Efficiency, 2.2MHz

Synchronous Micropower Step-Down DC/DC Converter with IQ = 25µA

VIN: 3V to 42V, VOUT(MIN) = 0.8V, IQ = 25µA, ISD < 25µA,

6mm × 6mm QFN-40 Package

LT8603

42V, Low IQ, Quad Output Triple Monolithic Buck Converter and

Boost Controller

VIN: 3V to 42V, VOUT(MIN) = 0.8V, IQ = 25µA, ISD < 25µA,

6mm × 6mm QFN-40 Package

2.2µF

2.2µF

4.7µF

2.2µF

499k

0.1µF

0.1µF

0.72H**

953k

47µF

105k

4.7pF

0.1µF

0.82µH

976k

47µF

309k

4.7pF

0.1µF

0.60µH

649k

47µF

523k

10pF

499k

499k

10nF

22nF

13.7k

0.1µF

BST3

SW3

FB3

BST4

SW4

FB4

BIAS

BST1

SW1

FB1

BST2

SW2

FB2

EN/UVLO

EN2

VIN1

VIN2

EN3

EN4

VIN3

VIN4

PG4

PG3

PG2

PG1

TRK/SS4

TRK/SS3

TRK/SS2

TRK/SS1

RT

SYNC/MODE

OUT1

8V, 4A*

INTVCC

OUT4

1.8V, 2A

INTVCC

OUT3

3.3V, 2A

GND

LT8686S

CLK IN

3.0MHz

OUT1

VIN

9V TO 42V

**INDUCTOR VALUES CHOSEN FOR VIN = 12V

8686S TA05a

*CURRENT AVAILABLE FROM OUT1: 4A – IVIN3 – IVIN4 – IBIAS

1A LOAD PER OUTPUT

START-UP SEQUENCE:

VIN HIGH ENABLES OUT1,2

VOUT1,2 IN REGULATION ENABLES OUT3 AND OUT4

VOUT3 AND VOUT4 SOFT-START RATIOMETRICALLY

2ms/DIV

VIN

10V/DIV

VOUT1,2

5V/DIV

VOUT3

2V/DIV

VOUT4

2V/DIV

8686S TA04b

Start-Up Sequencing

Triple Output, 3MHz Step-Down Regulator with Sequenced Ratiometric Start-Up