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LTC3824EMSE-TRPBF

Description
High Voltage Step-Down Controller With 40μA Quiescent Current
File Size232KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3824EMSE-TRPBF Overview

High Voltage Step-Down Controller With 40μA Quiescent Current

FEATURES
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LTC3824
High Voltage Step-Down
Controller With 40µA
Quiescent Current
DESCRIPTION
The LTC
®
3824 is a step-down DC/DC controller designed
to drive an external P-channel MOSFET. With a wide input
range of 4V to 60V and a high voltage gate driver, the
LTC3824 is suitable for many industrial and automotive
high power applications. Constant frequency current mode
operation provides excellent performance.
The LTC3824 can be configured for Burst Mode operation.
Burst Mode operation enhances low current efficiency
(only 40μA quiescent current) and extends battery run
time. The switching frequency can be programmed up to
600kHz and is easily synchronizable.
Other features include current limit, soft-start, micropower
shutdown, and Burst Mode disable.
The LTC3824 is available in a 10-lead MSE power package.
L,
LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5731964.
Wide Input Range: 4V to 60V
Current Mode Constant Frequency PWM
Very Low Dropout Operation: 100% Duty Cycle
Programmable Switching Frequency:
200kHz to 600kHz
Selectable High Efficient Burst Mode
®
Operation:
40μA Quiescent Current
Easy Synchronization
8V, 2A Gate Drive (V
CC
> 10V) for Industrial High
Voltage P-channel MOSFET
Programmable Soft-Start
Programmable Current Limit
Available in a Small 10-Pin Thermally Enhanced
MSE Package
APPLICATIONS
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Industrial and Automotive Power Supplies
Telecom Power Supplies
Distributed Power Systems
TYPICAL APPLICATION
V
IN
5.5V TO 60V
C
IN
33μF
100V
5V/2A Buck Converter
+
C
CAP
0.1μF
CAP
V
CC
Efficiency and Power Loss vs Load Current
100
V
IN
= 12V
V
IN
= 40V
2.5
90
EFFICIENCY (%)
R
S
0.025Ω
EFFICIENCY
2.0
POWER LOSS (W)
80
1.5
SENSE
LTC3824
R
SET
392k
GND
100pF
SYNC/MODE
V
FB
SS
0.1μF
V
C
10k
3.3nF
80.6k
3824 TA01
GATE
70
V
IN
= 40V
POWER LOSS
V
IN
= 12V
50
10
100
LOAD CURRENT (mA)
1000
1.0
22μH
C
OUT
100μF
2
422k
V
OUT
5V
2A
60
0.5
51Ω
0
2000
3824 TA01a
3824fc
1

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