FEATURES
w
wVery Low Shutdown Current: <1µA
S Regulateda ±4% Output Voltage t Outputa Current: 100mA at V =3.1V D Inp...
FEATURES
w
wVery Low Shutdown Current: <1µA
S Regulateda ±4% Output
Voltage t Outputa Current: 100mA at V =3.1V D Input Range: 2.7V to 4.5V . No Inductors Required w
IN
e e h
U 4 t
m o .c
AIC1848
Regulated 5V Charge Pump In SOT-23
DESCRIPTION
The AIC1848 charge pump is a micropower charge pump DC/DC converter that produces a regulated output
voltage from 2.7V to 4.5V input
voltage. Low external-part count (one flying capacitor and two small bypass
capacitors) makes the AIC1848 ideal for small, batterypowered applications.
1.8MHz Switching Frequency Short-Circuit and Over Temperature Protection Low Profile Package: SOT-23-6
The AIC1848 operates as a constant frequency mode switched capacitor
voltage doubler to
APPLICATIONS
White LEDs Backlighting SIM Interface Supplies for Cellular Telephones Li-Ion Battery Backup Supplies Local 3V to 5V Conversion Smart Card Readers PCMCIA Local 5V Supplies
produce a regulated output and features with thermal shutdown capability and short circuit protection.
The AIC1848 is available in a space-saving
TYPICAL APPLICATION CIRCUIT
1-Cell Li-ion Battery
CIN 1µF
w
w
R=
w
t a .D
U1 1 VOUT GND 2 3 SHDN AIC1848
S a
C+ 6 5 4 C-
e h
SOT-23-6 package.
U 4 t e
VOUT R1
.c
m o
COUT 1µF
R2
R3
VIN
CFLY 1µF
Regulated 5V Output from 2.7V to 4.5V Input WLED series number: NSPW310BS, VF=3.6V, IF=20mA
VOUT − V F IF
CIN, CFLY, COUT: JMK107BJ105KA, TAIYO YUDEN
Analog Integrations Corporation
Si-Soft Research Center TEL: 886-3-5772...