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LTC3891 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3891
Description  High Efficiency, 65V 500mA Synchronous
Download  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3891 Datasheet(HTML) 1 Page - Linear Technology

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LTC3630
1
3630fb
TYPICAL APPLICATION
FEATURES
DESCRIPTION
High Efficiency, 65V
500mA Synchronous
Step-Down Converter
The LTC®3630 is a high efficiency step-down DC/DC
converter 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 LTC3630 can supply up to 500mA 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 LTC3630’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 65V, the LTC3630 is a
robust converter suited for regulating a wide variety of
power sources. Additionally, the LTC3630 includes a precise
run threshold and soft-start feature to guarantee that the
power system start-up is well-controlled in any environ-
ment. A feedback comparator output enables multiple
LTC3630s to be paralleled in higher current applications.
The LTC3630 is available in the thermally-enhanced
3mm × 5mm DFN and the MSE16 packages.
Efficiency vs Load Current
4V to 65V Input to 3.3V Output, 500mA Step-Down Converter
APPLICATIONS
n Wide Operating Input Voltage Range: 4V to 65V
n Synchronous Operation for Highest Efficiency
n Internal High Side and Low Side Power MOSFETs
n No Compensation Required
n Adjustable 50mA to 500mA 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 Low Profile (0.75mm) 3mm × 5mm DFN and
Thermally-Enhanced MSE16 Packages
n Industrial Control Supplies
n Medical Devices
n Distributed Power Systems
n Portable Instruments
n Battery-Operated Devices
n Automotive
n Avionics
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
SW
VIN
4V TO 65V
LTC3630
47μH
100μF
2
3630 TA01a
2.2μF
VOUT
3.3V
500mA
GND
VFB
SS
VPRG2
RUN
VPRG1
ISET
FBO
VIN
LOAD CURRENT (mA)
50
70
90
100
0.1
10
100
1000
3630 TA01b
30
1
80
60
40
VOUT = 3.3V
VIN = 12V
VIN = 65V
ISET = 220kΩ||220pF
ISET = OPEN


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