LTC1517-5
TYPICAL APPLICATIONS
Low Noise Boosted 5V Supply
0.1µF
VIN
3.3V TO 5V
5
4
C1–
C1+
LTC1517-5
VIN GND VOUT
1
2
3
1µF
470Ω
Q1, Q2: 2N3904
3.3µF
Q2
A 50mV/DIV
AC COUPLED
A
470Ω
1µF
VOUT
B
2mV/DIV
Q1 B VOUT = 5V
AC COUPLED
IOUT = 1mA (VIN ≥ 3.3V)
1µF
1µF IOUT = 10mA (VIN ≥ 3.6V)
1517 TA04a
VRIPPLE < 2mVP-P
VIN = 3.3V
IOUT = 1mA
50µs/DIV
1517-5 TA04b
VIN
2.7V TO 5V
Generating 5V and a Negative Supply
3.3µF
0.1µF
5
4
C1–
C1+
LTC1517-5
VIN GND VOUT
1
2
3
VOUT = 5V ± 4%
IOUT = 10mA (2.7V ≤ VIN ≤ 5V)
3.3µF
IOUT = 20mA (3V ≤ VIN ≤ 5V)
470Ω
8.2k
Q1
Q2
0.1µF
3.3k
**
– VOUT = – 1.4V TO – 3.5V
1517 TA05 – IOUT = 0mA to 5mA
3.3µF
*
*CENTRAL SEMICONDUCTOR CMPSH-35 DUAL SCHOTTKY
**OPTIONAL CIRCUITRY FOR MAINTAINING – VOUT WITH LOW
VOUT LOADS
Q1, Q2: 2N3904
6