LTC3630A Datasheet, PDF (1/24 Pages) Linear Technology – High Efficiency, 76V 500mA Synchronous Step-Down Converter

LTC3630A
High Efficiency, 76V
500mA Synchronous
Step-Down Converter
Features
n _{Wide Operating Input Voltage Range: 4V to 76V}
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 VIN}
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
Applications
n _{Industrial Control Supplies}
n _{Medical Devices}
n _{Portable Instruments}
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.
Description
The LTC^®3630A 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 LTC3630A 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 LTC3630A’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 76V, the LTC3630A is
a robust converter suited for regulating a wide variety of
power sources. A feedback comparator output enables
multiple LTC3630As to be paralleled in higher current
applications.
The LTC3630A is available in the thermally-enhanced
3mm × 5mm DFN and the MSE16 packages.
PARAMETER
Maximum Operating V_IN
Absolute Maximum V_IN
LTC3630A
76V
80V
LTC3630
65V
70V
Typical Application
12.5V to 76V Input to 12V Output, 500mA Step-Down Converter
V_IN
12.5V TO 76V
2.2µF
V_IN
SW
LTC3630A
RUN
V_FB
I_SET
SS
FBO
V_PRG1
OVLO V_PRG2
GND
22µH
200k
147k
3630a TA01a
V_OUT
12V
22µF ^500mA
Efficiency and Power Loss vs Load Current
100
V_OUT = 12V
90
80
EFFICIENCY
70
1000
60
50
100
POWER LOSS
40
30
10
20
10
0
0.1
V_IN = 24V ₁
V_IN = 76V
1
10
100
1000
LOAD CURRENT (mA)
3630a TA01b
For more information www.linear.com/LTC3630A
3630af
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