AIC1845 Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – Regulated 5V Charge Pump In SOT-23

AIC1845
Regulated 5V Charge Pump In SOT-23
FEATURES
Ultralow Power: I_IN = 13µA
Regulated 5V ±4% Output Voltage
Output Current: 100mA (V_IN =3.3V)
110mA (V_IN =3.6V)
Input Range: 2.7V to 5.0V
No Inductors Needed
Very Low Shutdown Current: <1µA
Internal Oscillator: 650KHz
Short-Circuit and Overtemperature Protection
6-Pin SOT-23 Package
APPLICATIONS
White or Blue LED 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 AIC1845 is a micropower charge pump
DC/DC converter that produces a regulated 5V
output. The input voltage range is 2.7V to 5.0V.
Extremely low operating current (13µA typical
with no load) and a low external-part count (one
0.22µF flying capacitor and two small bypass
capacitors at V_IN and V_OUT ) make the AIC1845
ideally suitable for small, battery-powered
applications.
The AIC1845 operates as a PSM (Pulse
Skipping Modulation) mode switched capacitor
voltage doubler to produce a regulated output
and features with thermal shutdown capability
and short circuit protection.
The AIC1845 is available in a 6-pin SOT-23
package.
TYPICAL APPLICATION CIRCUIT
1-Cell
Li-ion Battery
C_IN
2.2µF
U1
1 _VOUT
2 _GND
3
SHDN
C+ ⁶
VIN ⁵
C- ⁴
V_OUT
** ^R1
C_OUT
2.2µF
* ** *
0.22µF
C_FLY
AIC1845
Regulated 5V Output from 2.7V to 5.0V Input
* WLED series number: NSPW310BS, V_F=3.6V, I_F=20mA
** _{R1 =} ^{VOUT − VF} , N_WLED: The number of WLED
I_F × N_WLED
C_IN, C_OUT: CELMK212BJ225MG (X5R) (0805), TAIYO YUDEN
C_FLY : CEEMK212BJ224KG (X7R) (0805), 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-1845P-03 010405
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