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Linear Technology Electronic Components Datasheet

LTC3638 Datasheet

140V 250mA Step-Down Regulator

No Preview Available !

FEATURES
n Wide Operating Input Voltage Range: 4V to 140V
n Internal Low Resistance Power MOSFET
n No Compensation Required
n Adjustable 20mA to 250mA 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
LTC3638
High Efficiency, 140V
250mA Step-Down
Regulator
DESCRIPTION
The LTC®3638 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 LTC3638 can supply up to 250mA 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 LTC3638’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 LTC3638 is a robust regulator
suited for regulating from a wide variety of power sources.
Additionally, the LTC3638 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 LTC3638s to be con-
nected in parallel for higher current applications.
The LTC3638 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, 250mA Step-Down Regulator
VIN
5V TO 140V
CIN
1µF
250V
VIN SW
LTC3638
RUN VFB
OVLO
SS
VPRG2 VPRG1
GND
L1
220µH
VOUT
5V
250mA
COUT
22µF
3638 TA01a
Efficiency and Power Loss vs Load Current
100
90 EFFICIENCY
80
70 VIN = 12V
60
VIN = 48V
VIN = 140V
1000
50
40 100
30
20 POWER LOSS 10
10
01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3638 TA01b
For more information www.linear.com/LTC3638
3638fa
1


Linear Technology Electronic Components Datasheet

LTC3638 Datasheet

140V 250mA Step-Down Regulator

No Preview Available !

LTC3638
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Supply Voltage.................................... –0.3V to 140V
RUN Voltage............................................. –0.3V to 140V
SS, FBO, OVLO, ISET Voltages....................... –0.3V to 6V
VFB, VPRG1, VPRG2 Voltages.......................... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3, 4)
LTC3638E, LTC3638I.......................... –40°C to 125°C
LTC3638H........................................... –40°C to 150°C
LTC3638MP........................................ –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
SW 1
TOP VIEW
16 GND
VIN 3 17 14 RUN
FBO 5 GND 12 OVLO
VVPPGRRNGGD21
6
7
8
11
10
ISSSET
9 VFB
MSE PACKAGE
VARIATION: MSE16 (12)
16-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3638EMSE#PBF
LTC3638EMSE#TRPBF 3638
16-Lead Plastic MSOP
–40°C to 125°C
LTC3638IMSE#PBF
LTC3638IMSE#TRPBF 3638
16-Lead Plastic MSOP
–40°C to 125°C
LTC3638HMSE#PBF
LTC3638HMSE#TRPBF 3638
16-Lead Plastic MSOP
–40°C to 150°C
LTC3638MPMSE#PBF
LTC3638MPMSE#TRPBF 3638
16-Lead Plastic MSOP
–55°C to 150°C
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 non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Input Supply (VIN)
VIN Input Voltage Operating Range
VOUT Output Voltage Operating Range
UVLO
VIN Undervoltage Lockout
VVIINN
Rising
Falling
Hysteresis
4 140
0.8 VIN
l 3.5 3.75 4.0
l 3.3 3.5 3.8
250
V
V
V
V
mV
IQ DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown Mode
VRUN
RUN Pin Threshold
No Load
VRUN = 0V
RUN Rising
RUN Falling
Hysteresis
150 350
12 22
1.4 6
1.17 1.21 1.25
1.06 1.10 1.14
110
µA
µA
µA
V
V
mV
IRUN
VOVLO
RUN Pin Leakage Current
OVLO Pin Threshold
RUN = 1.3V
OVLO Rising
OVLO Falling
Hysteresis
–10 0
10
1.17 1.21 1.25
1.06 1.10 1.14
110
nA
V
V
mV
3638fa
2 For more information www.linear.com/LTC3638


Part Number LTC3638
Description 140V 250mA Step-Down Regulator
Maker Linear Technology
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LTC3638 Datasheet PDF






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