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LT3959_15

Description
Wide Input Voltage Range Boost/SEPIC/Inverting Converter with 6A, 40V Switch
File Size328KB,26 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LT3959_15 Overview

Wide Input Voltage Range Boost/SEPIC/Inverting Converter with 6A, 40V Switch

FeaTures
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LT3959
Wide Input Voltage Range
Boost/SEPIC/Inverting Converter
with 6A, 40V Switch
DescripTion
The
LT
®
3959
is a wide input range, current mode, DC/DC
controller which is capable of regulating either positive or
negative output voltages from a single feedback pin. It can
be configured as a boost, SEPIC or inverting converter.
It features an internal low side N-channel MOSFET rated
for 6A at 40V and driven from an internal regulated sup-
ply provided from V
IN
or DRIVE. The fixed frequency,
current-mode architecture results in stable operation over
a wide range of supply and output voltages. The operating
frequency of LT3959 can be set over a 100kHz to 1MHz
range with an external resistor, or can be synchronized
to an external clock using the SYNC pin.
The LT3959 features soft-start and frequency foldback
functions to limit inductor current during start-up and
output short-circuit. A window comparator on the FBX
pin reports via the
PGOOD
pin, providing output voltage
status indication.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 7825665.
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Wide V
IN
Range: 1.6V (2.5V Start-Up) to 40V
Positive or Negative Output Voltage Programming
with a Single Feedback Pin
PGOOD
Output Voltage Status Report
Internal 6A/40V Power Switch
Programmable Soft-Start
Programmable Operating Frequency (100kHz to 1MHz)
with One External Resistor
Synchronizable to an External Clock
Low Shutdown Current < 1µA
INTV
CC
Regulator Supplied from V
IN
or DRIVE
Programmable Input Undervoltage Lockout with
Hysteresis
Thermally Enhanced QFN (5mm × 6mm) and TSSOP
Packages
Automotive
Telecom
Industrial
applicaTions
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Typical applicaTion
2.5V to 24V Input, 12V Output SEPIC Converter
Excellent for Automotive 12V Post Regulator
L1A
C
IN
22µF
50V
×2
150k
4.7µF
50V
100
V
OUT
12V
500mA AT V
IN
= 2.5V
1.5A AT V
IN
> 8V
95
90
EFFICIENCY (%)
85
80
75
70
DRIVE
SYNC
RT
SS
V
C
27.4k
300kHz
0.1µF
7.5k
22nF
4.7µF
3959 TA01a
Efficiency vs Output Current
V
IN
= 12V
V
IN
2.5V TO
24V
124k
V
IN
EN_UVLO
SW
L1B
121k
C
OUT
47µF
16V
×2
LT3959
PGOOD
GND
TIE TO SGND
IF NOT USED
65
105K
60
0
800
600
200
400
OUTPUT CURRENT (mA)
1000
3959 TA01b
FBX
SGND GNDK INTV
CC
15.8K
3959fa
For more information
www.linear.com/LT3959
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