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Linear Technology - 140V 400mA Step-Down Regulator

Numéro de référence LTC7138
Description 140V 400mA Step-Down Regulator
Fabricant Linear Technology 
Logo Linear Technology 





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LTC7138 fiche technique
Features
n Wide Operating Input Voltage Range: 4V to 140V
n Internal Low Resistance Power MOSFET
n No Compensation Required
n Adjustable 100mA to 400mA 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 or External Soft-Start
n Programmable 1.8V, 3.3V, 5V or Adjustable Output
n Few External Components Required
n Programmable Input Overvoltage Lockout
n Thermally Enhanced High Voltage MSOP Package
Applications
n Industrial Control Supplies
n Medical Devices
n Distributed Power Systems
n Portable Instruments
n Battery-Operated Devices
n Avionics
n Automotive
LTC7138
High Efficiency, 140V
400mA Step-Down
Regulator
Description
The LTC®7138 is a high efficiency step-down DC/DC
regulator with internal power switch that draws only 12μA
typical DC supply current while maintaining a regulated
output voltage at no load.
The LTC7138 can supply up to 400mA 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 LTC7138’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 140V and programmable
overvoltage lockout, the LTC7138 is a robust regulator
suited for regulating from a wide variety of power sources.
Additionally, the LTC7138 includes a precise run threshold
and soft-start feature to guarantee that the power system
start-up is well-controlled in any environment. A feedback
comparator output enables multiple LTC7138s to be con-
nected in parallel for higher current applications.
The LTC7138 is available in a thermally enhanced high
voltage-capable 16-lead MSE package with four missing pins.
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
5V to 140V Input to 5V Output, 400mA Step-Down Regulator
VIN
5V TO 140V CIN
1µF
250V
VIN SW
LTC7138
RUN ANODE
SS
VPRG1
VFB
VPRG2
OVLO
GND
L1
220µH
VOUT
5V
COUT 400mA
22µF
7138 TA01a
Efficiency and Power Loss vs Load Current
100
90 EFFICIENCY
80
70
60 1000
50
40 POWER LOSS
100
30
20
10
0
0.1
VIN = 12V 10
VIN = 48V
VIN = 140V 1
1 10 100 1000
LOAD CURRENT (mA)
7138 TA01b
For more information www.linear.com/LTC7138
7138f
1

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