Datasheet LT8640, LT8640-1 (Analog Devices) - 8

LT8640/LT8640-1
TYPICAL PERFORMANCE CHARACTERISTICS RT Programmed Switching Frequency VIN UVLO Bias Pin Current
250 3.6 8.5 V 225 BIAS = 5V 3.4 VOUT = 5V 200 8.0 ILOAD = 1A 3.2 fSW = 1MHz 175 7.5 150 3.0 125 2.8 7.0 100 2.6 INPUT VOLTAGE (V) 6.5 RT PIN RESISTOR (kΩ) 75 2.4 BIAS PIN CURRENT (mA) 50 6.0 25 2.2 0 2.0 5.5 0.2 0.6 1 1.4 1.8 2.2 2.6 3 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8640 G28 8640 G29 8640 G30
Case Temperature Rise vs 7A Bias Pin Current Case Temperature Rise Pulsed Load
20 80 90 VBIAS = 5V DC2202A DEMO BOARD DC2202A DEMO BOARD VOUT = 5V 70 VIN = 12V, fSW = 1MHz 80 VIN = 12V VIN = 12V V V °C) IN = 24V, fSW = 1MHz °C) OUT = 5V 15 ILOAD = 1A 60 VIN = 12V, fSW = 2MHz 70 fSW = 2MHz VIN = 24V, fSW = 2MHz STANDBY LOAD = 0.25A 60 50 1KHz PULSED LOAD = 7A 50 10 40 40 30 30 BIAS PIN CURRENT (mA) 5 20 20 CASE TEMPERATURE RISE ( CASE TEMPERATURE RISE ( 10 10 0 0 0 0.2 0.6 1 1.4 1.8 2.2 2.6 3 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 SWITCHING FREQUENCY (MHz) LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8640 G31 8640 G32 8640 G33
Switching Waveforms, Full Switching Waveforms, Burst Frequency Continuous Operation Mode Operation Switching Waveforms
IL I 1A/DIV L IL 1A/DIV 500mA/DIV VSW 5V/DIV VSW VSW 10V/DIV 5V/DIV 500ns/DIV 8640 G34 5µs/DIV 8640 G35 500ns/DIV 8640 G36 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12VIN TO 5VOUT AT 1A 12VIN TO 5VOUT AT 10mA 36VIN TO 5VOUT AT 1A VSYNC = 0V Rev.C 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts