Datasheet LT8640S, LT8643S (Analog Devices) - 8

LT8640S/LT8643S
Typical perForMance characTerisTics LT8643S Error Amp Output LT8643S Soft-Start Tracking Soft-Start Current Current
1.2 2.2 500 VSS = 0.5V 2.1 375 1.0 2.0 250 0.8 1.9 125 TAGE (V) 0.6 1.8 0 1.7 –125 FB VOL 0.4 PIN CURRENT (µA) V C TR/SS PIN CURRENT (µA) 1.6 –250 0.2 1.5 –375 VC = 1.25V 0 1.4 –500 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 –200 –100 0 100 200 TR/SS VOLTAGE (V) TEMPERATURE (°C) FB PIN ERROR VOLTAGE (mV) 8640S G28 8640S G29 8640S G30
RT Programmed Switching PG High Thresholds PG Low Thresholds Frequency
10.0 –6.0 250 9.5 225 (%) –6.5 (%) REF REF 200 9.0 –7.0 175 8.5 –7.5 FB RISING 150 FB RISING 8.0 –8.0 125 7.5 –8.5 FB FALLING 100 FB FALLING 75 7.0 –9.0 RT PIN RESISTOR (kΩ) 50 6.5 –9.5 PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V 25 6.0 –10.0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0.2 0.6 1 1.4 1.8 2.2 2.6 3 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8640S G31 8640S G32 8640S G33
Minimum Input Voltage Minimum Input V Bias Pin Current Bias Pin Current
3.6 8.5 25 VBIAS = 5V VOUT = 5V 3.4 8.0 V 20 IN = 12V ILOAD = 1A 3.2 7.5 15 TAGE (V) 3.0 7.0 10 2.8 INPUT VOL 6.5 BIAS PIN CURRENT (mA) VBIAS = 5V BIAS PIN CURRENT (mA) V 5 2.6 OUT = 5V 6.0 ILOAD = 1A fSW = 1MHz 2.4 5.5 0 –50 –25 0 25 50 75 100 125 5 10 15 20 25 30 35 40 45 0.2 0.6 1 1.4 1.8 2.2 2.6 3.0 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHz) 8640S G34 8640S G35 8640S G36 8640sfa 8 For more information www.linear.com/LT8640S Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts