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