參數(shù)資料
型號： LT3688HFE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO24
封裝： LEAD FREE, PLASTIC, TSSOP-24
文件頁數(shù)： 1/28頁
文件大小： 415K
代理商： LT3688HFE#TRPBF
LT3688
1
3688f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual 800mA Step-Down
Switching Regulator with
Power-On Reset and
Watchdog Timer
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 efciency 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.
The reset and watchdog timeout periods are both adjust-
able using external capacitors. Tight accuracy specica-
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%
below the programmed value. The LT3688 watchdog timer
monitors for watchdog falling edges grouped too close
together or too far apart.
The LT3688 is available in 24-Pin TSSOP and 4mm
×
4mm QFN packages, each with an exposed pad for low
thermal resistance.
5V and 3.3V Regulator with Power-On Reset and Watchdog Timers
n Wide Input Range:
Operation from 3.8V to 36V
n Low Ripple (<25mVP-P) Burst Mode Operation:
IQ = 115μA at 12VIN to 3.3V and 5V
n Programmable, Defeatable Window Watchdog Timer
n Two Independently Programmable Power-On-Reset
Timers
n Synchronizable, Adjustable 350kHz-2.2MHz
Switching Frequency
n Two 800mA Output Switching Regulators with Internal
Power Switches
n Programmable Input Undervoltage Lockout with
Hysteresis
n Thermally Enhanced 24-Pin TSSOP and 4mm
× 4mm
QFN Packages
n Automotive Electronic Control Units
n Industrial Power Supplies
n High-Reliability μProcessor Systems
EN/UVLO
VIN
LT3688
GND
BIAS
BST1
0.22μF
4.7μF
VOUT1
5V
800mA
VIN
6V TO 36V
22μF
22pF
18μH
12μH
523k
100k
316k
100k
1nF
μP
0.22μF
SW1
DA1
BST2
SW2
DA2
FB1
RUN/SS1
WDI
WDO
RST1
RST2
I/O
RESET
FB2
RUN/SS2
CWDT
CPOR1
CPOR2
RT
SYNC
22μF
1nF
3688 TA01a
4.7nF
110k
fSW = 500kHz
VOUT2
3.3V
800mA
22pF
Efciency
3688 TA01b
0.0001
1
0.001
0.01
0.1
LOAD CURRENT (A)
EFFICIENCY
(%)
60
70
80
50
30
40
90
POWER
LOSS
(mW)
10.0
100.0
1000.0
1.0
0.01
0.1
10000.0
VIN = 12V
VOUT = 3.3V
L = 4.7μH
f = 800kHz
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.
相關(guān)PDF資料
PDF描述
LT3689IUD-5#PBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16
LT3689EMSE-5#TRPBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16
LT3689EUD-5#TRPBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16
LT3689EMSE-5#PBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16
LT3689IUD-5#TRPBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3688IFE#PBF 功能描述:IC REG BUCK ADJ 0.8A DL 24TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2
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LT3688IFEPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 800mA Step-Down Switching Regulator with Power-On Reset
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