Datasheet LT8710 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Synchronous SEPIC/Inverting/Boost Controller with Output Current Control |
| Pages / Page | 44 / 1 — FeaTures. DescripTion. Wide Input Range: 4.5V to 80V. Rail-to-Rail Output … |
| File Format / Size | PDF / 657 Kb |
| Document Language | English |
FeaTures. DescripTion. Wide Input Range: 4.5V to 80V. Rail-to-Rail Output Current Monitor and Control
Model Line for this Datasheet
Text Version of Document
LT8710 Synchronous SEPIC/ Inverting/Boost Controller with Output Current Control
FeaTures DescripTion
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 LT8710’s rail-to-rail output current monitor and control n Switching Frequency Up to 750kHz allows the part to be configured in current limited applica- n 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 n Can Be Synchronized to External Clock accurate bulk and float battery voltages. n High Gain EN/FBIN Pin Accepts Slowly Varying Input Signals The LT8710’s switching frequency range can be set be- n 20-Lead TSSOP Package tween 100kHz and 750kHz using an external resistor or synchronized to an external clock.
applicaTions
The LT8710 also features innovative EN/FBIN pin cir- n High Power Local Power Supply cuitry that allows for slowly varying input signals and n Wide Input Voltage Range SEPIC/Inverting an adjustable undervoltage lockout function. The pin is n Lead Acid Battery Charger also used for input voltage regulation to avoid collapsing n Automotive Engine Control Unit (ECU) Power a high impedance input supply. Additional features such n 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 applicaTion 300kHz Inverter Generates –5V from a 4.5V to 25V Input Efficiency and Power Loss
2.2µH • 10µF ×2 2.2µH • V 100 8 OUT VIN –5V 4.5V TO 25V 7A 90 7 330µF + 499Ω 80 6 POWER LOSS (W) 1.5m 70 5 4m 100µF 0.47µF 65 4 ×2 BG CSN CSP TG EFFICIENCY (%) 50 3 VIN ISN + 40 2 13.3k 120µF LT8710 ISP EN/FBIN 30 V 1 IN = 5V BIAS 60.4k INTVCC VIN = 12V 10k 2.2µF 20 0 2.2µF MODE INTVEE 0 1 2 3 4 5 6 7 10µF LOAD CURRENT (A) ×4 INTVCC FBX 8710 TA01b RT FLAG VC 118k SYNC GND IMON SS 11.5k 100pF 47nF 220nF 3.3nF 8710 TA01a 8710f For more information www.linear.com/LT8710 1
FeaTures DescripTion
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 LT8710’s rail-to-rail output current monitor and control n Switching Frequency Up to 750kHz allows the part to be configured in current limited applica- n 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 n Can Be Synchronized to External Clock accurate bulk and float battery voltages. n High Gain EN/FBIN Pin Accepts Slowly Varying Input Signals The LT8710’s switching frequency range can be set be- n 20-Lead TSSOP Package tween 100kHz and 750kHz using an external resistor or synchronized to an external clock.
applicaTions
The LT8710 also features innovative EN/FBIN pin cir- n High Power Local Power Supply cuitry that allows for slowly varying input signals and n Wide Input Voltage Range SEPIC/Inverting an adjustable undervoltage lockout function. The pin is n Lead Acid Battery Charger also used for input voltage regulation to avoid collapsing n Automotive Engine Control Unit (ECU) Power a high impedance input supply. Additional features such n 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 applicaTion 300kHz Inverter Generates –5V from a 4.5V to 25V Input Efficiency and Power Loss
2.2µH • 10µF ×2 2.2µH • V 100 8 OUT VIN –5V 4.5V TO 25V 7A 90 7 330µF + 499Ω 80 6 POWER LOSS (W) 1.5m 70 5 4m 100µF 0.47µF 65 4 ×2 BG CSN CSP TG EFFICIENCY (%) 50 3 VIN ISN + 40 2 13.3k 120µF LT8710 ISP EN/FBIN 30 V 1 IN = 5V BIAS 60.4k INTVCC VIN = 12V 10k 2.2µF 20 0 2.2µF MODE INTVEE 0 1 2 3 4 5 6 7 10µF LOAD CURRENT (A) ×4 INTVCC FBX 8710 TA01b RT FLAG VC 118k SYNC GND IMON SS 11.5k 100pF 47nF 220nF 3.3nF 8710 TA01a 8710f For more information www.linear.com/LT8710 1
