AIC1848 Datasheet, PDF (1/10 Pages) Analog Intergrations Corporation – Regulated 5V Charge Pump In SOT-23

AIC1848
Regulated 5V Charge Pump In SOT-23
FEATURES
Regulated ±4% Output Voltage
Output Current: 100mA at V_IN =3.1V
Input Range: 2.7V to 4.5V
No Inductors Required
Very Low Shutdown Current: <1µA
1.8MHz Switching Frequency
Short-Circuit and Over Temperature Protection
Low Profile Package: SOT-23-6
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
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, battery-
powered applications.
The AIC1848 operates as a constant frequency
mode switched capacitor voltage doubler to
produce a regulated output and features with
thermal shutdown capability and short circuit
protection.
The AIC1848 is available in a space-saving
SOT-23-6 package.
TYPICAL APPLICATION CIRCUIT
V_OUT
1-Cell
Li-ion Battery
U1
C_IN
1 _VOUT
C+ ⁶
1µF
2 _GND
VIN ⁵
3
SHDN
C- ⁴
C_OUT
1µF
C_FLY
1µF
R1 R2 R3
AIC1848
Regulated 5V Output from 2.7V to 4.5V Input
WLED series number: NSPW310BS, V_F=3.6V, I_F=20mA
R = ^{VOUT − VF}
I_F
C_IN, C_FLY, C_OUT: JMK107BJ105KA, TAIYO YUDEN
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: [phone]
FAX: [phone] www.analog.com.tw
DS-1848P-03 102406
1