POWER LOSS (W)
LTC3824
High Voltage Step-Down
Controller With 40A
Quiescent Current
Fea T Descrip T
n
Wide Input Range: 4V to 60V
The LTC 3824 is a step-down DC/DC controller designed
n
Current Mode Constant Frequency PWM
to drive an external P-channel MOSFET. With a wide input
n
Very Low Dropout Operation: 100% Duty Cycle
range of 4V to 60V and a high voltage gate driver, the
n
Programmable Switching Frequency:
LTC3824 is suitable for many industrial and automotive
200kHz to 600kHz
high power applications. Constant frequency current mode
n
Selectable High Efficient Burst Mode Operation:
operation provides excellent performance.
40A Quiescent Current
The LTC3824 can be configured for Burst Mode operation.
n
Easy Synchronization
Burst Mode operation enhances low current efficiency
n
8V, 2A Gate Drive (V > 10V) for Industrial High
CC
(only 40A quiescent current) and extends battery run
Voltage P-Channel MOSFET
time. The switching frequency can be programmed up to
n
Programmable Soft-Start
600kHz and is easily synchronizable.
n
Programmable Current Limit
n Other features include current limit, soft-start, micropower
Available in a Small 10-Pin Thermally Enhanced
shutdown, and Burst Mode disable.
MSE Package
The LTC3824 is available in a 10-lead MSE power package.
a T
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
n including 5731964.
Industrial and Automotive Power Supplies
n
Telecom Power Supplies
n
Distributed Power Systems
Typical a T
5V/2A Buck Converter Efficiency and Power Loss vs Load Current
V
IN
5.5V TO 60V
100 2.5
C
CAP
C
+
IN 0.1F
33F
V = 12V
100V
CAP EFFICIENCY IN
90 2.0
V
CC
R
S
V = 40V
IN
0.025
80 1.5
SENSE
LTC3824
70 1.0
R GATE
SET
22H
V
OUT
392k
5V V = 40V
IN
C 60 0.5
OUT 2A
GND
POWER LOSS
100F
100pF
V = 12V
2
IN
50 0
51
422k
10 100 1000 2000
SYNC/MODE
LOAD CURRENT (mA)
V
FB
SS 3824 TA01a
V
C
80.6k
0.1F
10k
3824 TA01
3.3nF
3824fh
1
For more information www.linear.com/LTC3824
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3824
a Te Maxi Mu M r a T p in c F T
(Note 1)
TOP VIEW
V ...........................................................................65V
CC
GND 1 10 CAP
SS, R , V .............................................................4V SYNC/MODE 2 9 GATE
SET FB
11
R 3 8 V
SET CC
GND
V ...............................................................................3V
C V 4 7 SENSE
C
V 5 6 SS
FB
SYNC/MODE ...............................................................6V
MSE PACKAGE
V V ..............................................................1V
CC SENSE
10-LEAD PLASTIC MSOP
T = 150C, = 43C/W, = 3C/W
Operating Junction Temperature Range JMAX JA JC
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
(Note 2) .................................................. 55C to 150C
Storage Temperature Range ..................... 65 to 150C
Lead Temperature (Soldering, 10 sec) .................. 300C
Der in F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3824EMSE#PBF LTC3824EMSE#TRPBF LTBRZ 10-Lead Plastic MSOP 40C to 125C
LTC3824IMSE#PBF LTC3824IMSE#TRPBF LTCGZ 10-Lead Plastic MSOP 40C to 125C
LTC3824HMSE#PBF LTC3824HMSE#TRPBF LTCGZ 10-Lead Plastic MSOP 40C to 150C
LTC3824MPMSE#PBF LTC3824MPMSE#TRPBF LTCGZ 10-Lead Plastic MSOP 55C to 150C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3824EMSE LTC3824EMSE#TR LTBRZ 10-Lead Plastic MSOP 40C to 125C
LTC3824IMSE LTC3824IMSE#TR LTCGZ 10-Lead Plastic MSOP 40C to 125C
LTC3824HMSE LTC3824HMSE#TR LTCGZ 10-Lead Plastic MSOP 40C to 150C
LTC3824MPMSE LTC3824MPMSE#TR LTCGZ 10-Lead Plastic MSOP 55C to 150C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: