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Linear Technology Electronic Components Datasheet

LTC3637 Datasheet

1A Step-Down Regulator

No Preview Available !

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 cansupply up to1A load current andfeatures
a programmable peak current limit that provides a simple
method for optimizing efficiency and for reducing output
ripple and component size. The L TC3637’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 76,Vand programmable
overvoltage lockout, the L TC3637 is a robust regulator
suited for regulating from a widevariety ofpower sources.
Additionally, the LTC3637 includesa 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
VIN
12.5V TO 76V
2.2µF
VIN SW
LTC3637
RUN VFB
SS
FBO VPRG1
VPRG2
OVLO ISET
GND
10µH
200k
VOUT
12V
47µF 1A
35.7k
3637 TA01a
Efficiency and Power Loss vs Load Current
100
90
VOUT = 12V
EFFICIENCY
80
70
60 1000
50
40 POWER LOSS
100
30
20
10
0
0.1
VIN = 24V 10
VIN = 48V
VIN = 76V 0
1.0 10 100 1000
LOAD CURRENT (mA)
3637 TA01b
For more information www.linear.com/LTC3637
3637f
1
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Linear Technology Electronic Components Datasheet

LTC3637 Datasheet

1A Step-Down Regulator

No Preview Available !

LTC3637
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Supply Voltage..................................... –0.3V to 80V
RUN Voltage............................................... –0.3V to 80V
SS, FBO, ISET Voltages ................................. –0.3V to 6V
VFB, VPRG1, VPRG2, OVLO Voltages .............. –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3, 4)
LTC3637E, LTC3637I ......................... –40°C to 125°C
LTC3637H.......................................... –40°C to 150°C
LTC3637MP....................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 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 = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
SW 1
NC 2
VIN 3
NC 4
FBO 5
VPRG2
VPRG1
GND
6
7
8
16 GND
15 NC
14 RUN
17 13 NC
GND 12 OVLO
11 ISET
10 SS
9 VFB
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
(NOTE 6)
TJMAX = 150°C, θJA = 43°C/W, θJC = 5°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
LTC3637EMSE#PBF
LTC3637EMSE#TRPBF 3637
16-Lead Plastic MSOP
–40°C to 125°C
LTC3637IMSE#PBF
LTC3637IMSE#TRPBF 3637
16-Lead Plastic MSOP
–40°C to 125°C
LTC3637HMSE#PBF
LTC3637HMSE#TRPBF 3637
16-Lead Plastic MSOP
–40°C to 150°C
LTC3637MPMSE#PBF
LTC3637MPMSE#TRPBF 3637
16-Lead Plastic MSOP
–55°C to 150°C
LTC3637EDHC#PBF
LTC3637IDHC#PBF
LTC3637EDHC#TRPBF
LTC3637IDHC#TRPBF
3637
3637
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
–40°C to 125°C
–40°C to 125°C
LTC3637HDHC#PBF
LTC3637HDHC#TRPBF 3637
16-Lead (5mm × 3mm) Plastic DFN
–40°C to 150°C
LTC3637MPDHC#PBF
LTC3637MPDHC#TRPBF 3637
16-Lead (5mm × 3mm) Plastic DFN
–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/
3637f
2 For more information www.linear.com/LTC3637


Part Number LTC3637
Description 1A Step-Down Regulator
Maker Linear Technology
Total Page 24 Pages
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