參數(shù)資料
型號(hào)： LT3645IUD#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16
文件頁(yè)數(shù)： 1/24頁(yè)
文件大小： 296K
代理商： LT3645IUD#PBF
LT3645
1
3645f
LOAD CURRENT (mA)
0
100
50
EFFICIENCY
(%)
60
70
80
90
200
300
3645 TA01b
400
500
VOUT = 3.3V
VIN = 12V
VOUT = 5V
TYPICAL APPLICATION
FEATURES
DESCRIPTION
36V 500mA Step-Down
Regulator and 200mA LDO
The LT3645 is a dual output regulator combining a 500mA
buck regulator and a 200mA low dropout linear regula-
tor (LDO). The wide input voltage range of 3.6V to 36V
makes the LT3645 suitable for regulating power from a
wide variety of sources, including 24V industrial supplies
and automotive batteries. Its high operating frequency
allows the use of tiny, low cost inductors and capacitors,
resulting in a very small solution.
Cycle-by-cycle current limit and frequency foldback pro-
vide protection against shorted outputs. Soft-start and
frequency foldback eliminate input current surge during
start-up.
The linear regulator operates from the VCC2 pin at voltages
down to 1.2V. It supplies 200mA of output current with a
typical dropout voltage of 310mV.
Other features of the LT3645 include a <2μA shutdown,
short circuit protection, soft-start and thermal shutdown.
The LT3645 is available in the thermally enhanced 16-lead
(3mm × 3mm) QFN package, or a 12-lead MSE package.
3.3V/5V Step-Down Converter
APPLICATIONS
n Automotive CMOS Image Sensors
n Industrial/Automotive Micro-Controller Supply
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
n Wide Input Range:
Operation from 3.6V to 36V
Overvoltage Lockout Protects Circuit Through
55V Transients on Input
n 500mA Output Current Switching Regulator
n High Switching Frequency: 750kHz
n 200mA Low Dropout Linear Regulator
1.2V to 16V Input; 0.8V to 8V Output
310mV Dropout Voltage VCC2 to OUT2
n Precision Programmable Undervoltage Lockout
n Short-Circuit Robust
n Internal Soft-Start
n <2μA Shutdown Current
n Small Thermally Enhanced 16-Lead (3mm × 3mm)
QFN and 12-Lead MSE Packages
Buck Regulator Efciency
1μF
3645 TA01a
PGOOD
6.2V TO 36V
GND
SW
DA
FB
FB2
EN2
VCC2
VIN
EN/UVLO
NPG
OUT2
10μF
5V
300mA
3.3V
200mA
15μH
52.3k
31.6k
10k
BOOST
LT3645
2.2μF
0.1μF
ON OFF
相關(guān)PDF資料
PDF描述
LT3645EUD#TRPBF 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16
LT3645EMSE#TRPBF 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO12
LT3651IUHE-4.2#PBF BATTERY CHARGE CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PQCC36
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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