Sam Nork ≥ µ µ µ µ µ µ µ µ ® 90 VIN = 3V EFFICIENCY (%) 80 VIN = 2V TO 5V 2 + 10µF 3 + 10µF 4 LOW IQ MODE (SEE FIGURE 3) SHDN = 0V 60 0.22µF 1 70 C1+ C1– VIN SHDN LTC1516 VOUT GND C2+ C2 – 50 0.01 8 7 0.1 1 10 OUTPUT CURRENT (mA) 100 DN142 F02 ON/OFF 6 SHDN PIN WAVEFORMS: 5 0.22µF VOUT = 5V ±4% IOUT = 0mA TO 20mA, VIN ≥ 2V IOUT = 0mA TO 50mA, VIN ≥ 3V 1196/142 LOW IQ MODE (5Hz TO 100Hz, 95% TO 98% DUTY CYCLE) IOUT ≤ 100µA VOUT LOAD ENABLE MODE (IOUT = 100µA TO 50mA) DN142 F03 DN142 F01 µ µ µ µ µ µ µ 6.0 + C1 0.1µF SUPPLY CURRENT (µA) 9V 7 LTC1440 4 IN – – 3 IN + + R4 47Ω V+ R1 OUT 8 47k 4.0 Q2 Q1 5 HYST 2.0 6 REF C2 0.1µF 0.0 2.0 3.0 4.0 INPUT VOLTAGE (V) + – V– GND 2 1 5.0 R3 3.9M 3.3V 10mA DN142 F04 R2 2.2M µ Q1: TP0610T Q2: MMBT3906LT1 C3 1nF (OPTIONAL) + C4 22µF 10V TANT DN142 F04 µ DN142 F06 dn142 1099 5K • PRINTED IN JAPAN LINEAR TECHNOLOGY CORPORATION 1996