Datasheet > LT8685S

LT8685S

更新时间： 2023-12-20 18:44:00

品牌	Logo	应用领域
亚德诺 - ADI		稳压器
页数	文件大小	规格书
24页	1890K
描述
42V 四通道、可联合、同步、单片式降压型稳压器

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LT8685S 数据手册

LT8685S

42V Quad, Gangable, Synchronous,

Monolithic Step-Down Regulator

FEATURES

DESCRIPTION

Silent Switcher^®2 Architecture

The LT^®8685S is a highly flexible, four channel, current

mode, monolithic regulator able to power a wide range

Ultralow EMI Emissions

Optional Spread Spectrum Modulation

of automotive and industrial applications while occupying

minimal board space.

Two High Voltage Synchronous Buck Regulators

3V to 42V Input Voltage Range

The LT8685S combines two 42V capable 2.5A buck reg-

ulators with two 8V capable 4A buck regulators. The two

42V regulators may be combined to provide up to 5A of

output current using a single inductor. Similarly, the two

8V regulators may be combined to provide up to 8A of

output current using a single inductor. Individual channel

enable, track/soft-start and power good pins provide flex-

ible power supply sequencing and control. The LT8685S

features a Silent Switcher 2 architecture, plus selectable

spread spectrum mode, to provide ultralow EMI/EMC

emissions while delivering high efficiency at high switch-

ing frequencies.

Output Currents Up to 2.5A per Channel

Channels May Be Connected in Parallel Using a

Single Inductor

Two Low Voltage Synchronous Buck Regulators

3V to 8V Input Voltage Range

Output Currents Up to 4A per Channel

Channels May Be Connected in Parallel Using a

Single Inductor

12µA I All Channels Active and No-Load

Flexible Supply Sequencing and Control

Adjustable and Synchronizable: 350kHz to 3MHz

Available in 36-Lead LQFN (5mm × 6mm)

AEC-Q100 Qualified for Automotive Applications

The LT8685S incorporates thermal shutdown and individ-

ual channel cycle-by-cycle current limit for short circuit

protection and robust operation.

APPLICATIONS

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

Automotive Systems

Industrial Controls and Power Supplies

TYPICAL APPLICATION

42V Input, Quad Output 2MHz Step-Down Regulator

EN/UVLO

BIAS

EN2

Efficiency and Loss

IN1

6V TO 42V

BST1

100

3.0

2.5

2.0

1.5

1.0

0.5

OUT1

SW1

5V, 2.5A*

FB1

IN2

LT8685S

BST2

HV CHANNEL EFFICIENCY 12V → 5V

LV CHANNEL EFFICIENCY 5V → 1.8V

HV CHANNEL LOSS

OUT2

3.3V, 2.5A

OUT1

EN3

SW2

FB2

EN4

LV CHANNEL LOSS

IN3

IN4

BST3

OUT3

1.8V, 4A

SW3

FB3

PG1-4

TRK/SS1-4

INTV

BST4

SYNC/MODE

0.001

0.01

0.1

OUT4

1.2V, 4A

LOAD CURRENT (A)

SW4

FB4

8685S TA01b

GND

*CURRENT AVAILABLE FROM OUT1:

2.5A – I – I – I

VIN3 VIN4 BIAS

8685S TA01a

Rev. 0

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