POWER LOSS (mW)
LTC3630A
High Efficiency, 76V
500mA Synchronous
Step-Down Converter
Fea T Descrip T
n
Wide Operating Input Voltage Range: 4V to 76V The LTC 3630A is a high efficiency step-down DC/DC
n
Synchronous Operation for Highest Efficiency converter with internal high side and synchronous power
n
Internal High Side and Low Side Power MOSFETs switches that draws only 12A typical DC supply current
n
No Compensation Required while maintaining a regulated output voltage at no load.
n
Adjustable 50mA to 500mA Maximum Output Current
The LTC3630A can supply up to 500mA load current and
n
Low Dropout Operation: 100% Duty Cycle
features a programmable peak current limit that provides
n
Low Quiescent Current: 12A
a simple method for optimizing efficiency and for reduc-
n
Wide Output Range: 0.8V to V
IN
ing output ripple and component size. The LTC3630As
n
0.8V 1% Feedback Voltage Reference
combination of Burst Mode operation, integrated power
n
Precise RUN Pin Threshold
switches, low quiescent current, and programmable peak
n
Internal and External Soft-Start
current limit provides high efficiency over a broad range
n
Programmable 1.8V, 3.3V, 5V or Adjustable Output
of load currents.
n
Few External Components Required
n With its wide input range of 4V to 76V, the LTC3630A is
Low Profile (0.75mm) 3mm 5mm DFN and
a robust converter suited for regulating a wide variety of
Thermally-Enhanced MSE16 Packages
power sources. A feedback comparator output enables
a T multiple LTC3630As to be paralleled in higher current
applications.
n
Industrial Control Supplies
n The LTC3630A is available in the thermally-enhanced
Medical Devices
n 3mm 5mm DFN and the MSE16 packages.
Portable Instruments
n
Automotive
PARAMETER LTC3630A LTC3630
n
Avionics
Maximum Operating V 76V 65V
IN
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
Absolute Maximum V 80V 70V
IN
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical a T
Efficiency and Power Loss vs Load Current
100
V = 12V
OUT
12.5V to 76V Input to 12V Output, 500mA Step-Down Converter
90
80
22H
V
OUT
V
IN EFFICIENCY
V SW 12V
IN
70 1000
12.5V TO 76V
500mA
2.2F
22F
200k
LTC3630A
60
RUN
V
FB
50 100
POWER LOSS
I SS
SET 147k
40
FBO V
PRG1
10
V 30
PRG2
GND
20
3630a TA01a
V = 24V
IN
10 1
V = 76V
IN
0
0.1 1 10 100 1000
LOAD CURRENT (mA) 3630a TA01b
3630afc
1
For more information www.linear.com/LTC3630A
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3630A
a T e Maxi Mu M r a T (Note 1)
V Supply Voltage ..................................... 0.3V to 80V Operating Junction Temperature Range (Notes 2, 3, 4)
IN
RUN Voltage................................................. 0.3V to 6V LTC3630AE, LTC3630AI .................... 40C to 125C
SS, FBO, I Voltages ................................. 0.3V to 6V LTC3630AH ....................................... 40C to 150C
SET
V , V , V Voltages ......................... 0.3V to 6V LTC3630AMP ..................................... 55C to 150C
FB PRG1 PRG2
Storage Temperature Range .................. 65C to 150C
Lead Temperature (Soldering, 10 sec)
MSOP ...............................................................300C
p c F T
TOP VIEW
SW 1 16 GND
TOP VIEW
NC 2 15 NC
SW 1 16 GND
V 3 14 GND
IN
V 3 14 GND
IN
NC 4 13 NC
17
17
5 12 FBO GND
RUN GND
RUN 5 12 FBO
V 6 11 I
SET
PRG2
7 10 SS
V V 6 11 I
PRG1
PRG2 SET
GND 8 9 V
FB
V 7 10 SS
PRG1
MSE PACKAGE
GND 8 9 V
FB
VARIATION: MSE16 (12)
16-LEAD PLASTIC MSOP
T = 150C, = 45C/W, = 10C/W DHC PACKAGE
JMAX JA JC
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB 16-LEAD (5mm 3mm) PLASTIC DFN
(NOTE 6)
T = 150C, = 43C/W, = 5C/W
JMAX JA JC
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3630AEMSE#PBF LTC3630AEMSE#TRPBF 3630A 16-Lead Plastic MSOP 40C to 125C
LTC3630AIMSE#PBF LTC3630AIMSE#TRPBF 3630A 16-Lead Plastic MSOP 40C to 125C
LTC3630AHMSE#PBF LTC3630AHMSE#TRPBF 3630A 16-Lead Plastic MSOP 40C to 150C
LTC3630AMPMSE#PBF LTC3630AMPMSE#TRPBF 3630A 16-Lead Plastic MSOP 55C to 150C
LTC3630AEDHC#PBF LTC3630AEDHC#TRPBF 3630A 16-Lead (5mm 3mm) Plastic DFN 40C to 125C
LTC3630AIDHC#PBF LTC3630AIDHC#TRPBF 3630A 16-Lead (5mm 3mm) Plastic DFN 40C to 125C
LTC3630AHDHC#PBF LTC3630AHDHC#TRPBF 3630A 16-Lead (5mm 3mm) Plastic DFN 40C to 150C
LTC3630AMPDHC#PBF LTC3630AMPDHC#TRPBF 3630A 16-Lead (5mm 3mm) Plastic DFN 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.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: