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
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