A2012

DESIGN SHOWCASE ) ( ) POWER FAIL 50ms ( ) 1) keeping) C1 (1.15V) IC1 150mA 10µA ( 1) (LBO ( 2) (house LBO R3 STBY IC 350mV ( ) 11.5V EDN 3/16/95 3 ( LBO ) SW1 ( VIN 5 IC1 MAX882 S1 R2 1M 1 R1 1k POWER FAIL R3 220k LBO IN VIN TIMING RELATIONSHIPS OUT LOW-BATTERY COMPARATOR 4 R4 1M, 0.1% 8 VOUT 3.3V VOUT LBI POWER FAIL ERROR AMPLIFIER R5 49.9k, 0.1% SET 2 STBY 7 C1 1µF STBY GND 3, 6 VREF R6 604k, 0.1% 50ms/div VOUT = 3.3V, COUT = 0pF, RL = 2kΩ 1 S1 2 1 12