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Datasheet> 器件分类 > LT3688IUF#TRPBF
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LT3688IUF#TRPBF

产品描述Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin QFN EP T/R
文件大小419KB，共28页
制造商ADI(亚德诺半导体)
官网地址https://www.analog.com
下载文档 详细参数 选型对比 全文预览

LT3688IUF#TRPBF概述

Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin QFN EP T/R

LT3688IUF#TRPBF规格参数

参数名称属性值
欧盟限制某些有害物质的使用Compliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
类型
Type		Step Down
输出类型
Output Type		Adjustable
Switching Frequency (kHz)350 to 2200
Switching RegulatorYes
Number of Outputs2
Output Voltage (V)0.8 to 32.4
Maximum Output Current (A)0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8
Minimum Input Voltage (V)3.8
Maximum Input Voltage (V)36
Operating Supply Voltage (V)3.8 to 36
Typical Quiescent Current (uA)235
Line Regulation0.002%/V(Typ)
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeIndustrial
系列
Packaging		Tape and Reel
Supplier PackageQFN EP
Pin Count24
Standard Package NameQFN
MountingSurface Mount
Package Height0.75(Max)
Package Length4
Package Width4
PCB changed24
Lead ShapeNo Lead

文档预览

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FEATURES
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LT3688
Dual 800mA Step-Down
Switching Regulator with
Power-On Reset and
Watchdog Timer
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.
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%
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.
Wide Input Range:
Operation from 3.8V to 36V
Low Ripple (<25mV
P-P
) Burst Mode Operation:
I
Q
= 115μA at 12V
IN
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
APPLICATIONS
n
n
n
Automotive Electronic Control Units
Industrial Power Supplies
High-Reliability μProcessor 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
V
IN
6V TO 36V
Efficiency
90
V
IN
= 12V
V
OUT
= 3.3V
L = 4.7μH
f = 800kHz
10000.0
1000.0
POWER LOSS (mW)
100.0
10.0
1.0
0.1
0.01
0.001
0.01
0.1
LOAD CURRENT (A)
1
3688 TA01b
4.7μF
EN/UVLO
BST1
V
IN
BIAS
BST2
0.22μF 12μH
SW2
V
OUT2
3.3V
800mA
22pF
1nF
100k
22μF
80
EFFICIENCY (%)
70
60
50
40
1nF
4.7nF
4.7nF
110k
3688 TA01a
V
OUT1
5V
800mA
22pF
22μF
18μH
523k
0.22μF
SW1
LT3688
DA1
FB1
DA2
FB2
RUN/SS2
C
WDT
C
POR1
C
POR2
RT
SYNC
316k
100k 1nF
RUN/SS1
μP
I/O
I/O
RESET
WDI
WDO
RST1
RST2
GND
30
0.0001
f
SW
= 500kHz
3688f
1

LT3688IUF#TRPBF相似产品对比

LT3688IUF#TRPBF LT3688EFE#PBF LT3688EFE#TRPBF LT3688EUF#PBF LT3688EUF#TRPBF LT3688HFE#PBF LT3688HFE#TRPBF LT3688IFE#PBF LT3688IFE#TRPBF LT3688IUF#PBF
描述 Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin QFN EP T/R Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin TSSOP EP Tube Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin TSSOP EP T/R Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin QFN EP Tube Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin QFN EP T/R Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin TSSOP EP Tube Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin TSSOP EP T/R Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin TSSOP EP Tube Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin TSSOP EP T/R Conv DC-DC 3.8V to 36V Step Down Dual-Out 0.8V to 32.4V 0.8A/0.8A Automotive 24-Pin QFN EP Tube
欧盟限制某些有害物质的使用 Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active Active Active Active Active Active Active
类型
Type		 Step Down Step Down Step Down Step Down Step Down Step Down Step Down Step Down Step Down Step Down
输出类型
Output Type		 Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable
Switching Frequency (kHz) 350 to 2200 350 to 2200 350 to 2200 350 to 2200 350 to 2200 350 to 2200 350 to 2200 350 to 2200 350 to 2200 350 to 2200
Switching Regulator Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Number of Outputs 2 2 2 2 2 2 2 2 2 2
Output Voltage (V) 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4 0.8 to 32.4
Maximum Output Current (A) 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8 0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8|0.8
Minimum Input Voltage (V) 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8
Maximum Input Voltage (V) 36 36 36 36 36 36 36 36 36 36
Operating Supply Voltage (V) 3.8 to 36 3.8 to 36 3.8 to 36 3.8 to 36 3.8 to 36 3.8 to 36 3.8 to 36 3.8 to 36 3.8 to 36 3.8 to 36
Typical Quiescent Current (uA) 235 235 235 235 235 235 235 235 235 235
Line Regulation 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ) 0.002%/V(Typ)
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40 -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 125 125 125 125 125 150 150 125 125 125
Supplier Temperature Grade Industrial Extended Extended Extended Extended Automotive Automotive Industrial Industrial Industrial
系列
Packaging		 Tape and Reel Tube Tape and Reel Tube Tape and Reel Tube Tape and Reel Tube Tape and Reel Tube
Supplier Package QFN EP TSSOP EP TSSOP EP QFN EP QFN EP TSSOP EP TSSOP EP TSSOP EP TSSOP EP QFN EP
Pin Count 24 24 24 24 24 24 24 24 24 24
Standard Package Name QFN SOP SOP QFN QFN SOP SOP SOP SOP QFN
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 1.05(Max) 1.05(Max) 0.75(Max) 0.75(Max) 1.05(Max) 1.05(Max) 1.05(Max) 1.05(Max) 0.75(Max)
Package Length 4 7.9(Max) 7.9(Max) 4 4 7.9(Max) 7.9(Max) 7.9(Max) 7.9(Max) 4
Package Width 4 4.5(Max) 4.5(Max) 4 4 4.5(Max) 4.5(Max) 4.5(Max) 4.5(Max) 4
PCB changed 24 24 24 24 24 24 24 24 24 24
Lead Shape No Lead Gull-wing Gull-wing No Lead No Lead Gull-wing Gull-wing Gull-wing Gull-wing No Lead
HTS 8542.39.00.01 - 8542.39.00.01 8504.40.95.80 8542.39.00.01 8542.39.00.01 8542.39.00.01 - 8542.39.00.01 8542.39.00.01

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