LT3579 LINER [Linear Technology], LT3579 Datasheet
LT3579
Manufacturer Part Number
LT3579
Description
6A Boost/Inverting DC/DC Converter with Fault Protection
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT3579.pdf
(40 pages)
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APPLICATIONS
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L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 7579816.
TYPICAL APPLICATION
FEATURES
V
5V
IN
6A, 42V Combined Power Switch
Output Short Circuit Protection
Wide Input Range: 2.5V to 16V Operating,
40V Maximum Transient
LT3579-1: Dual-Phase Capable
Master/Slave (3.4A/2.6A) Switch Design
User Confi gurable Undervoltage Lockout
Easily Confi gurable as a Boost, SEPIC, Inverting, or
Flyback Converter
Low V
Can be Synchronized to External Clock
Can Synchronize other Switching Regulators
High Gain SHDN Pin Accepts Slowly Varying Input
Signals
20-Lead TSSOP and 20-Pin 4mm × 5mm QFN
Packages
Local Power Supply
Vacuum Flourescent Display (VFD) Bias Supplies
TFT-LCD Bias Supplies
Automotive Engine Control Unit (ECU) Power
1MHz, 5V to 12V Boost Converter with Output Short Circuit Protection
22μF
CESAT
100k
200k
Switch: 250mV at 5.5A (Typical)
2.2μH
86.6k
V
FAULT
SHDN
RT
SYNC GND
IN
SW1 SW2
LT3579
CLKOUT
GATE
SS
V
FB
C
0.1μF
DC/DC Converter with Fault Protection
TEMPERATURE
MONITOR
10μF
47pF
130k
6.3k
8k
2.2nF
3579 TA01
V
IN
DESCRIPTION
The LT
protection features to aid in protecting against output shorts,
input/output overvoltage, and overtemperature conditions.
The part consists of a 42V master switch, and a 42V slave switch
that can be tied together for a total current limit of 6A.
The LT3579 is ideal for many local power supply designs. It
can be easily confi gured in Boost, SEPIC, Inverting, or Flyback
confi gurations, and is capable of generating 12V at 1.7A, or
–12V at 1.2A from a 5V input. In addition, the LT3579’s slave
switch allows the part to be confi gured in high voltage, high
power charge pump topologies that are very effi cient and
require fewer components than traditional circuits.
The LT3579’s switching frequency range can be set bet ween
200kHz and 2.5MHz. The part may be clocked internally at
a frequency set by the resistor from the RT pin to ground,
or it may be synchronized to an external clock. A buffered
version of the clock signal is driven out of the CLKOUT
pin, and may be used to synchronize other compatible
switching regulator ICs to the LT3579.
The LT3579 also features innovative SHDN pin circuitry that
allows for slowly varying input signals and an adjustable
undervoltage lockout function. Additional features such
as frequency foldback and soft-start are integrated. The
LT3579 is available in 20-lead TSSOP and 20-pin 4mm ×
5mm QFN packages.
V
12V
1.7A
10μF
OUT
®
3579 is a PWM DC/DC converter with built-in fault
100
6A Boost/Inverting
90
80
70
60
50
40
30
20
0
0.25
LT3579/LT3579-1
Effi ciency and Power Loss
0.5
LOAD CURRENT (A)
0.75
1
1.25 1.5 1.75
35791 TA02
2
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
35791f
1
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