LTC3630
1
3630fd
For more information www.linear.com/LTC3630
Typical applicaTion
FeaTures DescripTion
High Efficiency, 65V
500mA Synchronous
Step-Down Converter
The LTC
®
3630 is a high efficiency step-down DC/DC
converter with internal high side and synchronous power
switches that draws only 12μA typical DC supply current
while maintaining a regulated output voltage at no load.
The LTC3630 can supply up to 500mA load current and
features a programmable peak current limit that provides
a simple method for optimizing efficiency and for reduc
-
ing output ripple and component size. The LTC3630’s
combination of Burst Mode
®
operation, integrated power
switches, low quiescent current, and programmable peak
current limit provides high efficiency over a broad range
of load currents.
With its wide input range of 4V to 65V, the LTC3630 is a
robust converter suited for regulating a wide variety of
power sources. Additionally, the LTC3630 includes a precise
run threshold and soft-start feature to guarantee that the
power system start-up is well-controlled in any environ
-
ment. A feedback comparator output enables multiple
LTC3630s to be paralleled in higher current applications.
The LTC3630 is available in the thermally-enhanced
3mm × 5mm DFN and the MSE16 packages.
Efficiency vs Load Current
4V to 65V Input to 3.3V Output, 500mA Step-Down Converter
applicaTions
n
Wide Operating Input Voltage Range: 4V to 65V
n
Synchronous Operation for Highest Efficiency
n
Internal High Side and Low Side Power MOSFETs
n
No Compensation Required
n
Adjustable 50mA to 500mA Maximum Output Current
n
Low Dropout Operation: 100% Duty Cycle
n
Low Quiescent Current: 12µA
n
Wide Output Range: 0.8V to V
IN
n
0.8V ±1% Feedback Voltage Reference
n
Precise RUN Pin Threshold
n
Internal and External Soft-Start
n
Programmable 1.8V, 3.3V, 5V or Adjustable Output
n
Few External Components Required
n
Low Profile (0.75mm) 3mm × 5mm DFN and
Thermally-Enhanced MSE16 Packages
n
Industrial Control Supplies
n
Medical Devices
n
Distributed Power Systems
n
Portable Instruments
n
Battery-Operated Devices
n
Automotive
n
Avionics
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
SW
V
IN
LTC3630
100µF
×2
3630 TA01a
2.2µF
OUT
3.3V
GND
V
FB
SS
V
PRG2
RUN
V
PRG1
I
SET
FBO
V
IN
50
70
90
100
0.1 10 100
3630 TA01b
30
1
80
60
40
V
OUT
= 3.3V
V
IN
= 12V
V
IN
= 65V
I
SET
= 220kΩ||220pF
I
SET
= OPEN