POWER LOSS (W)
LT8710
Synchronous SEPIC/
Inverting/Boost Controller with
Output Current Control
Fea T Descrip T
n
Wide Input Range: 4.5V to 80V The LT 8710 is a synchronous PWM DC/DC controller
n
Rail-to-Rail Output Current Monitor and Control with a rail-to-rail output current monitor and control. The
n
Input Voltage Regulation for High Impedance Inputs LT8710 is ideal for many types of power supply topologies
n
C/10 or Power Good Indication Pin and can be easily configured for boost, SEPIC, inverting,
n
MODE Pin for Forced CCM or Pulse-Skipping or flyback configurations.
Operation
The LT8710s rail-to-rail output current monitor and control
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Switching Frequency Up to 750kHz
allows the part to be configured in current limited applica-
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Easily Configurable as a Boost, SEPIC, Inverting or
tions such as battery charging. The FLAG pin can be used
Flyback Converter with Single Feedback Pin
as a power good indication or C/10 indication allowing for
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Can Be Synchronized to External Clock
accurate bulk and float battery voltages.
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High Gain EN/FBIN Pin Accepts Slowly Varying Input
The LT8710s switching frequency range can be set be-
Signals
n tween 100kHz and 750kHz using an external resistor or
20-Lead TSSOP Package
synchronized to an external clock.
a T
The LT8710 also features innovative EN/FBIN pin cir-
n
High Power Local Power Supply
cuitry that allows for slowly varying input signals and
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Wide Input Voltage Range SEPIC/Inverting
an adjustable undervoltage lockout function. The pin is
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Lead Acid Battery Charger
also used for input voltage regulation to avoid collapsing
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Automotive Engine Control Unit (ECU) Power
a high impedance input supply. Additional features such
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Solar Panel Power Converter
as frequency foldback and soft-start are integrated. The
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
LT8710 is available in a 20-lead TSSOP package.
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, Including 7579816.
Typical a T
300kHz Inverter Generates 5V from a 4.5V to 25V Input Efficiency and Power Loss
10F 2 100 8
2.2H
2.2H V
OUT
V
IN
5V
4.5V TO 25V
90 7
7A
330F
6
80
499
70 5
1.5m
100F
4m
4
65
0.47F
2
3
BG CSN CSP TG 50
V ISN
IN
40 2
+
13.3k
120F
ISP
LT8710
30 V = 5V 1
IN
EN/FBIN
60.4k
BIAS INTV
CC V = 12V
IN
10k
2.2F 20 0
0 1 2 3 4 5 6 7
MODE INTV
2.2F EE
10F
LOAD CURRENT (A)
4
INTV FBX 8710 TA01b
CC
FLAG
RT
V
C
118k
11.5k
SYNC GND IMON SS
100pF
47nF 220nF 3.3nF
8710 TA01a
8710f
1
For more information www.linear.com/LT8710
EFFICIENCY (%)
+
ion pplica
ions pplica
ion uresLT8710
a Te Maxi Mu M r a T
(Note 1)
V Voltage ................................................ 0.3V to 80V MODE Voltage ............................................ 0.3V to 40V
IN
BIAS Voltage .............................................. 0.3V to 80V INTV Voltage ............................................ 0.3V to 7V
CC
EN/FBIN Voltage ......................................... 0.3V to 80V INTV Voltage......................................................Note 5
EE
BG Voltage ............................................................Note 5 CSP Voltage ................................................. 0.3V to 2V
TG Voltage ............................................................Note 5 CSN Voltage ................................................. 0.3V to 2V
RT Voltage ................................................... 0.3V to 5V ISP Voltage ................................. ISN 0.4V to ISN + 2V
SS Voltage ................................................... 0.3V to 3V ISN Voltage ................................................ 0.3V to 80V
FBX Voltage .................................................................5V IMON Voltage ............................................ 0.3V to 2.5V
FBX Current ............................................................1mA Operating Junction Temperature Range
V Voltage .................................................... 0.3V to 2V LT8710E ............................................. 40C to 125C
C
SYNC Voltage ............................................ 0.3V to 5.5V LT8710I .............................................. 40C to 125C
FLAG Voltage ............................................... 0.3V to 7V Storage Temperature Range .................. 65C to 150C
FLAG Current ......................................................... 1mA Lead Temperature (Soldering, 10 sec) ...................300C
p c F T
TOP VIEW
FBX 1 20 GND
V 2 19 SYNC
C
SS 3 18 RT
FLAG 4 17 MODE
IMON 5 16 EN/FBIN
21
GND
ISN 6 15 CSP
ISP 7 14 CSN
BIAS 8 13 V
IN
INTV 9 12 INTV
EE CC
TG 10 11 BG
FE PACKAGE
20-LEAD PLASTIC TSSOP
T = 125C, = 38C/W, = 10C/W
JMAX JA JC
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8710EFE#PBF LT8710EFE#TRPBF LT8710FE 20-Lead Plastic TSSOP 40C to 125C
LT8710IFE#PBF LT8710IFE#TRPBF LT8710FE 20-Lead Plastic TSSOP 40C to 125C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: