AIC1641 Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – LOW VOLTAGE STEP-UP DC/DC CONVERTER

AIC1641
LOW VOLTAGE STEP-UP DC/DC CONVERTER
SPEC NO: DS-1641-00 05/04/00


FEATURES
! Guaranteed Start-Up from Below 0.9 V.
! High Efficiency.
! Low Quiescent Current.
! Fixed Output Voltage: 2.7V, 3.0V, 3.3V, and 5V.
! Logic Controlled Shutdown.
! External Switch Driver for High Power Level Applica-
tion.


APPLICATIONS
! Pagers.
! Cameras.
! Wireless Microphones.
! Pocket Organizers.
! Battery Backup Suppliers.
! Portable Instruments.

DESCRIPTION
The AIC1641 is a high efficiency step-up DC/DC
converter for applications using 1 to 4 battery cells.
Only three external components are required to de-
liver a fixed output voltage of 2.7V, 3.0V, 3.3V, or
5.0V.
Pulse Frequency Modulation scheme brings opti-
mized performance for applications with light output
loading and low input voltage. The output ripple
and noise are lower compared with the circuit op-
erating in PSM mode. The AIC1641 starts up from
below 0.9V input to boost either 2.7V, 3.0V, 3.3V,
or 5.0V output with 1mA load.
Some useful features include, shutdown mode for
saving the life of battery. The PFM control circuit
operates in 100KHz (max.) switching rate, resulting
in smaller passive component size, which makes
the AIC1641 an ideal choice of DC/DC converter
for space conscious applications.

TYPICAL APPLICATION CIRCUIT
+
C1
47µF
V_OUT
V_OUT
CE
D1
L1
1N5819
VIN _33µH

0.9V
Q1
2SD1803
C_B
10nF
R_B
EXT GND
AIC1641
300
One Cell Step-Up DC/DC Converter
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: [phone] FAX:[phone]
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