ADVANCE INFORMATION AIC1640
LOW VOLTAGE STEP-UP DC/DC CONVERTER
SPEC NO: DS-1640-P1
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1
■ FEATURES
tensans Guaranteed Start-Up from Below 0.9 V.
tensans High Efficiency.
tensans Low Quiescent Current.
tensans Fixed or adjustable Output Voltage.
tensans Logic Controlled Shutdown.
tensans External Switch Driver available.
■ APPLICATIONS
tensans Pagers.
tensans Cameras.
tensans Wireless Microphones.
tensans Pocket Organizers.
tensans Battery Backup Suppliers.
tensans Portable Instruments.
■ DESCRIPTION
The AIC1640 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 3V, 3.3V, or 5V.
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 AIC1640 starts up from
below 0.9V input to boost either 3V, 3.3V, or 5V
output with 1mA load.
Some useful features include external driver for
higher power level applications, shutdown mode for
saving the life of battery, and adjustable output ver-
sion. The PFM control circuit operates in 100KHz
(max.) switching rate, resulting in smaller passive
component size, which makes the AIC1640 an ide-
al choice of DC/DC converter for space conscious
applications.
■ TYPICAL APPLICATION CIRCUIT
+
C1
22µF
L1
88µH
D1
SB02-03C
AIC1640
GND
CE
NC
SW
EXT
VDD
V
OUT
3.3V
V
IN
NC
NC
≧0.9V
R1
300
C1
10nF
Q1
2SD2150
+
C2
100µF
L1
33µH
D1
1N5819
V
OUT
3.3V/100mA
V
IN
AIC1640
GND
CE
NC
SW
EXT
VDD
NC
NC
≧0.9V
3.3V Output Step-Up DC/DC Converter 3.3V/100mA Step-Up DC/DC Converter