LT8582_15 Datasheet, PDF (1/36 Pages) Linear Technology – Dual 3A Boost/Inverting/SEPIC DC/DC Converter with Fault Protection

FEATURES
n _{Dual 42V, 3A Combined Power Switch}
n _{Master/Slave (1.7A/1.3A) Switch Design}
n _{Wide Input Range: 2.5V to 22V Operating, 40V}
Maximum Transient
n _{Power Good Pin for Event Based Sequencing}
n _{Switching Frequency Up to 2.5MHz}
n _{Each Channel Easily Configurable as a Boost, SEPIC,}
Inverting or Flyback Converter
n _{Low VCESAT Switch: 270mV at 2.75A (Typical)}
n _{Can be Synchronized to an External Clock}
n _{Output Short-Circuit Protection}
n _{High Gain SHDN Pin Accepts Slowly Varying Input}
Signals
n _{24-Pin 7mm × 4mm DFN Package}
APPLICATIONS
n _{Local Power Supply}
n _{Vacuum Fluorescent Display (VFD) Bias Supplies}
n _{TFT-LCD Bias Supplies}
n _{Automotive Engine Control Unit (ECU) Power}
LT8582
Dual 3A Boost/Inverting/SEPIC
DC/DC Converter with
Fault Protection
DESCRIPTION
The LT^®8582 is a dual independent channel PWM DC/DC
converter with a power good pin and built-in fault protection
to help guard against input overvoltage and overtempera-
ture conditions. Each channel consists of a 42V master
switch and a 42V slave switch that can be tied together
for a total current limit of 3A.
The LT8582 is ideal for many local power supply designs.
Each channel can be easily configured in boost, SEPIC,
inverting, or flyback configurations. Together, the two chan-
nels can produce a 12V and a –12V output with 14.4W of
combined output power from a 5V input. In addition, the
LT8582’s slave switch allows the part to be configured in
high voltage, high power charge pump topologies that
are more efficient and require fewer components than
traditional circuits.
The LT8582 also features innovative SHDN pin circuitry that
allows for slowly varying input signals and an adjustable
undervoltage lockout function. Additional features such as
output short protection, frequency foldback and soft-start
are integrated. The LT8582 is available in a 24-pin 7mm
× 4mm DFN package.
L, LT, LTC, LTM, 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. Protected by U.S. Patents including 7579816.
TYPICAL APPLICATION
1.5MHz, 5V to ±12V
V_IN
4.7μH
5V
4.7μF
10μF
215k
100k
SWA1 SWB1
130k
V_IN1
FBX1
SHDN1
GATE1
PG1
LT8582
V_C1
6.04k
SYNC1
CLKOUT1
CLKOUT2
SYNC2
100k
PG2
215k
SHDN2
SS1
6.49k
RT1
53.6k
0.1μF
4.7nF
GND
53.6k
0.1μF
2.2nF
RT2
SS2
14.7k
V_IN2
V_C2
4.7μH
GATE2
SWA2 SWB2 ^FBX2 _2.2μF
143k
4.7μH
4.7μF
V_OUT1
12V
550mA
10μF
47pF
47pF
10μF
8582 TA01a
V_OUT2
–12V
550mA
Efficiency and Power Loss
(Load Between 12V and –12V Outputs)
100
90
80
70
60
50
40
30
20
0
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
8582 TA01b
8582f
1