Datasheet LT8582 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | Dual 3A Boost/Inverting/SEPIC DC/DC Converter with Fault Protection |
| 页数 / 页 | 36 / 1 — FEATURES. DESCRIPTION. Dual 42V, 3A Combined Power Switch. Master/Slave … |
| 文件格式/大小 | PDF / 460 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Dual 42V, 3A Combined Power Switch. Master/Slave (1.7A/1.3A) Switch Design
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LT8582 Dual 3A Boost/Inverting/SEPIC DC/DC Converter with Fault Protection
FEATURES DESCRIPTION
n
Dual 42V, 3A Combined Power Switch
The LT®8582 is a dual independent channel PWM DC/DC n
Master/Slave (1.7A/1.3A) Switch Design
converter with a power good pin and built-in fault protection n
Wide Input Range: 2.5V to 22V Operating, 40V
to help guard against input overvoltage and overtempera-
Maximum Transient
ture conditions. Each channel consists of a 42V master n
Power Good Pin for Event Based Sequencing
switch and a 42V slave switch that can be tied together n Switching Frequency Up to 2.5MHz for a total current limit of 3A. n Each Channel Easily Configurable as a Boost, SEPIC, The LT8582 is ideal for many local power supply designs. Inverting or Flyback Converter Each channel can be easily configured in boost, SEPIC, n Low VCESAT Switch: 270mV at 2.75A (Typical) inverting, or flyback configurations. Together, the two chan- n Can be Synchronized to an External Clock nels can produce a 12V and a –12V output with 14.4W of n Output Short-Circuit Protection combined output power from a 5V input. In addition, the n High Gain SHDN Pin Accepts Slowly Varying Input LT8582’s slave switch allows the part to be configured in Signals high voltage, high power charge pump topologies that n 24-Pin 7mm × 4mm DFN Package are more efficient and require fewer components than traditional circuits.
APPLICATIONS
The LT8582 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable n Local Power Supply undervoltage lockout function. Additional features such as n Vacuum Fluorescent Display (VFD) Bias Supplies output short protection, frequency foldback and soft-start n TFT-LCD Bias Supplies are integrated. The LT8582 is available in a 24-pin 7mm n Automotive Engine Control Unit (ECU) Power × 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 Efficiency and Power Loss 1.5MHz, 5V to ±12V (Load Between 12V and –12V Outputs)
4.7μH VOUT1 VIN 12V 100 3.2 5V 4.7μF 10μF 550mA 90 2.8 SWA1 SWB1 130k 6.04k VIN1 FBX1 215k 80 2.4 SHDN1 POWER LOSS (W) GATE1 100k 70 2.0 PG1 V LT8582 C1 10μF 60 1.6 SYNC1 SS1 6.49k 50 1.2 CLKOUT1 RT1 EFFICIENCY (%) 53.6k 0.1μF 4.7nF 47pF CLKOUT2 40 0.8 GND SYNC2 30 0.4 53.6k 0.1μF 2.2nF 47pF 100k PG2 RT2 20 0 215k 0 0.1 0.2 0.3 0.4 0.5 0.6 SHDN2 14.7k SS2 LOAD CURRENT (A) V V 8582 TA01b IN2 C2 GATE2 10μF 143k FBX2 SWA2 SWB2 2.2μF 4.7μH 4.7μH VOUT2 s s –12V 550mA 8582 TA01a 4.7μF 8582f 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM STATE DIAGRAM OPERATION APPLICATIONS INFORMATION APPENDIX TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
FEATURES DESCRIPTION
n
Dual 42V, 3A Combined Power Switch
The LT®8582 is a dual independent channel PWM DC/DC n
Master/Slave (1.7A/1.3A) Switch Design
converter with a power good pin and built-in fault protection n
Wide Input Range: 2.5V to 22V Operating, 40V
to help guard against input overvoltage and overtempera-
Maximum Transient
ture conditions. Each channel consists of a 42V master n
Power Good Pin for Event Based Sequencing
switch and a 42V slave switch that can be tied together n Switching Frequency Up to 2.5MHz for a total current limit of 3A. n Each Channel Easily Configurable as a Boost, SEPIC, The LT8582 is ideal for many local power supply designs. Inverting or Flyback Converter Each channel can be easily configured in boost, SEPIC, n Low VCESAT Switch: 270mV at 2.75A (Typical) inverting, or flyback configurations. Together, the two chan- n Can be Synchronized to an External Clock nels can produce a 12V and a –12V output with 14.4W of n Output Short-Circuit Protection combined output power from a 5V input. In addition, the n High Gain SHDN Pin Accepts Slowly Varying Input LT8582’s slave switch allows the part to be configured in Signals high voltage, high power charge pump topologies that n 24-Pin 7mm × 4mm DFN Package are more efficient and require fewer components than traditional circuits.
APPLICATIONS
The LT8582 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable n Local Power Supply undervoltage lockout function. Additional features such as n Vacuum Fluorescent Display (VFD) Bias Supplies output short protection, frequency foldback and soft-start n TFT-LCD Bias Supplies are integrated. The LT8582 is available in a 24-pin 7mm n Automotive Engine Control Unit (ECU) Power × 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 Efficiency and Power Loss 1.5MHz, 5V to ±12V (Load Between 12V and –12V Outputs)
4.7μH VOUT1 VIN 12V 100 3.2 5V 4.7μF 10μF 550mA 90 2.8 SWA1 SWB1 130k 6.04k VIN1 FBX1 215k 80 2.4 SHDN1 POWER LOSS (W) GATE1 100k 70 2.0 PG1 V LT8582 C1 10μF 60 1.6 SYNC1 SS1 6.49k 50 1.2 CLKOUT1 RT1 EFFICIENCY (%) 53.6k 0.1μF 4.7nF 47pF CLKOUT2 40 0.8 GND SYNC2 30 0.4 53.6k 0.1μF 2.2nF 47pF 100k PG2 RT2 20 0 215k 0 0.1 0.2 0.3 0.4 0.5 0.6 SHDN2 14.7k SS2 LOAD CURRENT (A) V V 8582 TA01b IN2 C2 GATE2 10μF 143k FBX2 SWA2 SWB2 2.2μF 4.7μH 4.7μH VOUT2 s s –12V 550mA 8582 TA01a 4.7μF 8582f 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM STATE DIAGRAM OPERATION APPLICATIONS INFORMATION APPENDIX TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS