Datasheet > LT3688

LT3688

更新时间： 2023-12-20 18:45:34

品牌	Logo	应用领域
亚德诺 - ADI		开关稳压器
页数	文件大小	规格书
28页	420K
描述
具上电复位和看门狗定时器的双通道 800mA 降压型开关稳压器

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LT3688 数据手册

LT3688

Dual 800mA Step-Down

Switching Regulator with

Power-On Reset and

Watchdog Timer

FEATURES

DESCRIPTION

The LT^®3688 is an adjustable frequency (350kHz to

2.2MHz) dual monolithic step-down switching regulator

with two power-on reset timers and a watchdog timer.

The regulator operates off inputs up to 36V. Low ripple

Burst Mode^®operation maintains high efﬁciency at low

output current while keeping output ripple below 25mV in

a typical application, with input quiescent current of just

115μA. Shutdown circuitry reduces input supply current

to less than 1μA while EN/UVLO is pulled low.

Wide Input Range:

Operation from 3.8V to 36V

Low Ripple (<25mV ) Burst Mode Operation:

P-P

I = 115μA at 12V to 3.3V and 5V

Programmable, Defeatable Window Watchdog Timer

Two Independently Programmable Power-On-Reset

Timers

Synchronizable, Adjustable 350kHz-2.2MHz

Switching Frequency

Two 800mA Output Switching Regulators with Internal

Power Switches

Programmable Input Undervoltage Lockout with

Hysteresis

Thermally Enhanced 24-Pin TSSOP and 4mm × 4mm

QFN Packages

The reset and watchdog timeout periods are both adjust-

able using external capacitors. Tight accuracy speciﬁca-

tions and glitch immunity ensure reliable reset operation

without false triggering. The open collector RST pins will

pull down if the monitored output voltage drops 10%

belowtheprogrammedvalue.TheLT3688watchdogtimer

monitors for watchdog falling edges grouped too close

together or too far apart.

APPLICATIONS

Automotive Electronic Control Units

The LT3688 is available in 24-Pin TSSOP and 4mm ×

4mm QFN packages, each with an exposed pad for low

thermal resistance.

Industrial Power Supplies

High-Reliability ꢀProcessor Systems

L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

TYPICAL APPLICATION

5V and 3.3V Regulator with Power-On Reset and Watchdog Timers

Efﬁciency

10000.0

1000.0

100.0

10.0

6V TO 36V

= 12V

OUT

= 3.3V

4.7ꢀF

EN/UVLO

BST1

BIAS

BST2

L = 4.7ꢀH

f = 800kHz

18ꢀH

0.22ꢀF

0.22ꢀF 12ꢀH

OUT1

OUT2

3.3V

SW1

SW2

800mA

LT3688

523k

316k

100k

DA1

FB1

DA2

FB2

22pF

22ꢀF

22pF

1nF

1.0

100k

22ꢀF

RUN/SS2

RUN/SS1

0.1

WDT

ꢀP

I/O

RESET

WDI

POR1

1nF

WDO

RST1

RST2

0.01

POR2

0.0001

0.001

0.01

0.1

4.7nF

LOAD CURRENT (A)

SYNC

GND

3688 TA01b

110k

3688 TA01a

= 500kHz

3688f

12 3 4 5 6 7...28

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