LT3645
1
3645f
LOAD CURRENT (mA)
0 100
50
60
70
80
90
200 300
3645 TA01b
400 500
V
OUT
= 3.3V
V
IN
= 12V
V
OUT
= 5V
TYPICAL APPLICATION
FEATURES
DESCRIPTION
36V 500mA Step-Down
Regulator and 200mA LDO
The LT
?/DIV>
3645 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 V
CC2
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 <2糀 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 V
CC2
to OUT2
n
Precision Programmable Undervoltage Lockout
n
Short-Circuit Robust
n
Internal Soft-Start
n
<2糀 Shutdown Current
n
Small Thermally Enhanced 16-Lead (3mm ?3mm)
QFN and 12-Lead MSE Packages
Buck Regulator Ef ciency
1糉
3645 TA01a
PGOOD
6.2V TO 36V
GND
SW
DA
FB
FB2
EN2
V
CC2
V
IN
EN/UVLO
NPG
OUT2
10糉
5V
300mA
3.3V
200mA
15糎
52.3k
31.6k
10k
10k
BOOST
LT3645
2.2糉
0.1糉
ON OFF
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