LTC3637_15 Datasheet, PDF (1/26 Pages) Linear Technology – 76V, 1A Step-Down Regulator

FEATURES
n _{Wide Operating Input Voltage Range: 4V to 76V}
n _{Internal 350mΩ Power MOSFET}
n _{No Compensation Required}
n _{Adjustable 100mA to 1A 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 _{Programmable Input Overvoltage Lockout}
n _{Low Profile (0.75mm) 3mm × 5mm DFN and}
Thermally-Enhanced MSE16 Packages
APPLICATIONS
n _{Industrial Control Supplies}
n _{Medical Devices}
n _{Distributed Power Systems}
n _{Portable Instruments}
n _{Battery-Operated Devices}
n _Automotive
n _Avionics
LTC3637
76V, 1A Step-Down
Regulator
DESCRIPTION
The LTC^®3637 is a high efficiency step-down DC/DC
regulator with an internal high side power switch that
draws only 12μA DC supply current while maintaining a
regulated output voltage at no load.
The LTC3637 can supply up to 1A load current and features
a programmable peak current limit that provides a simple
method for optimizing efficiency and for reducing output
ripple and component size. The LTC3637’s combination
of Burst Mode^® operation, integrated power switch, 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, and programmable
overvoltage lockout, the LTC3637 is a robust regulator
suited for regulating from a wide variety of power sources.
Additionally, the LTC3637 includes a precise run threshold
and soft-start feature to guarantee that the power system
start-up is well-controlled in any environment.
The LTC3637 is available in the thermally-enhanced
3mm × 5mm DFN and the MSE16 packages.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
12.5V to 76V Input to 12V Output, 1A Regulator
V_IN
12.5V TO 76V
2.2µF
V_IN
SW
LTC3637
RUN V_FB
SS
FBO V_PRG1
V_PRG2
OVLO I_SET
GND
10µH
200k
V_OUT
12V
47µF ^1A
35.7k
3637 TA01a
Efficiency and Power Loss vs Load Current
100
V_OUT = 12V
90
EFFICIENCY
80
70
60
1000
50
40
POWER LOSS
100
30
20
10
0
0.1
V_IN = 24V ¹⁰
V_IN = 48V
V_IN = 76V
0
1.0
10
100
1000
LOAD CURRENT (mA)
3637 TA01b
For more information www.linear.com/LTC3637
3637fa
1