LT8710
Synchronous SEPIC/
Inverting/Boost Controller with
Output Current Control
DescripTion
FeaTures
The LT®8710 is a synchronous PWM DC/DC controller
with a rail-to-rail output current monitor and control. The
LT8710isidealformanytypesofpowersupplytopologies
and can be easily configured for boost, SEPIC, inverting,
or flyback configurations.
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Wide Input Range: 4.5V to 80V
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Rail-to-Rail Output Current Monitor and Control
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Input Voltage Regulation for High Impedance Inputs
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C/10 or Power Good Indication Pin
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MODE Pin for Forced CCM or Pulse-Skipping
Operation
Switching Frequency Up to 750kHz
TheLT8710’srail-to-railoutputcurrentmonitorandcontrol
allows the part to be configured in current limited applica-
tions such as battery charging. The FLAG pin can be used
as a power good indication or C/10 indication allowing for
accurate bulk and float battery voltages.
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Easily Configurable as a Boost, SEPIC, Inverting or
Flyback Converter with Single Feedback Pin
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Can Be Synchronized to External Clock
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High Gain EN/FBIN Pin Accepts Slowly Varying Input
The LT8710’s switching frequency range can be set be-
tween 100kHz and 750kHz using an external resistor or
synchronized to an external clock.
Signals
20-Lead TSSOP Package
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applicaTions
The LT8710 also features innovative EN/FBIN pin cir-
cuitry that allows for slowly varying input signals and
an adjustable undervoltage lockout function. The pin is
also used for input voltage regulation to avoid collapsing
a high impedance input supply. Additional features such
as frequency foldback and soft-start are integrated. The
LT8710 is available in a 20-lead TSSOP package.
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High Power Local Power Supply
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Wide Input Voltage Range SEPIC/Inverting
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Lead Acid Battery Charger
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Automotive Engine Control Unit (ECU) Power
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Solar Panel Power Converter
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
300kHz Inverter Generates –5V from a 4.5V to 25V Input
Efficiency and Power Loss
10µF ×2
100
90
80
70
65
50
40
30
20
8
7
6
5
4
3
2
1
0
2.2µH
2.2µH
V
–5V
7A
OUT
V
IN
4.5V TO 25V
330µF
+
499Ω
1.5m
100µF
×2
4m
0.47µF
BG
CSN
CSP TG
V
IN
ISN
+
13.3k
10k
120µF
ISP
LT8710
V
IN
V
IN
= 5V
EN/FBIN
MODE
60.4k
BIAS
INTV
= 12V
CC
2.2µF
0
1
2
3
4
5
6
7
INTV
2.2µF
EE
10µF
×4
LOAD CURRENT (A)
INTV
RT
FBX
8710 TA01b
CC
FLAG
V
C
118k
11.5k
3.3nF
SYNC GND
IMON
SS
100pF
47nF
220nF
8710 TA01a
8710f
1
For more information www.linear.com/LT8710