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Linear Technology Electronic Components Datasheet

LTC3639 Datasheet

150V 100mA Synchronous Step-Down Regulator

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LTC3639
High Efficiency, 150V
100mA Synchronous
Step-Down Regulator
Features
n Wide Operating Input Voltage Range: 4V to 150V
n Synchronous Operation for Highest Efficiency
n Internal High Side and Low Side Power MOSFETs
n No Compensation Required
n Adjustable 10mA to 100mA 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 Automotive
n Avionics
Description
The LTC®3639 is a high efficiency step-down DC/DC
regulator 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 LTC3639 can supply up to 100mA 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 LTC3639’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 150V and programmable
overvoltage lockout, the LTC3639 is a robust regulator
suited for regulating from a wide variety of power sources.
Additionally, the LTC3639 includes a precise run threshold
andhttp://www.DataSheet4U.net/ soft-start feature to guarantee that the power system
start-up is well-controlled in any environment. A feedback
comparator output enables multiple LTC3639s to be con-
nected in parallel for higher current applications.
The LTC3639 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 150V Input to 5V Output, 100mA Step-Down Regulator
VIN
5V TO 150V
1µF
200V
VIN SW
LTC3639
RUN VFB
OVLO
SS
VPRG2 VPRG1
GND
470µH
3639 TA01a
VOUT
5V
10µF 100mA
Efficiency and Power Loss vs Load Current
100
90
VOUT = 5V
EFFICIENCY
80
70 1000
60
VIN = 12V
VIN = 36V
50
40
VIN = 72V
VIN = 150V
100
30
POWER LOSS
10
20
10 1
0
0.1 1 10 100
LOAD CURRENT (mA)
3639 TA01b
For more information www.linear.com/LTC3639
3639f
1
datasheet pdf - http://www.DataSheet4U.net/


Linear Technology Electronic Components Datasheet

LTC3639 Datasheet

150V 100mA Synchronous Step-Down Regulator

No Preview Available !

LTC3639
Absolute Maximum Ratings
(Note 1)
VIN Supply Voltage.................................... –0.3V to 150V
RUN Voltage............................................. –0.3V to 150V
SS, FBO, OVLO, ISET Voltages....................... –0.3V to 6V
VFB, VPRG1, VPRG2 Voltages.......................... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3639E, LTC3639I.......................... –40°C to 125°C
LTC3639H........................................... –40°C to 150°C
LTC3639MP........................................ –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
LTC3639EMSE#PBF
LTC3639EMSE#TRPBF 3639
16-Lead Plastic MSOP
–40°C to 125°C
LTC3639IMSE#PBF
LTC3639IMSE#TRPBF 3639
16-Lead Plastic MSOP
–40°C to 125°C
LTC3639HMSE#PBF
LTC3639HMSE#TRPBF 3639
16-Lead Plastic MSOP
–40°C to 150°C
LTC3639MPMSE#PBF
LTC3639MPMSE#TRPBF 3639
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.
http://www.DataSheet4U.net/
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
4 150
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 4)
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
2 For more information www.linear.com/LTC3639
3639f
datasheet pdf - http://www.DataSheet4U.net/


Part Number LTC3639
Description 150V 100mA Synchronous Step-Down Regulator
Maker Linear Technology
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LTC3639 Datasheet PDF






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