ADVANCE INFORMATION
AIC1640
LOW VOLTAGE STEP-UP DC/DC CONVERTER
SPEC NO: DS-1640-P1
■
FEATURES
Guaranteed Start-Up from Below 0.9 V.
High Efficiency.
Low Quiescent Current.
Fixed or adjustable Output Voltage.
Logic Controlled Shutdown.
External Switch Driver available.
■
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
■
APPLICATIONS
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
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
+
V
OUT
3.3V/100mA
C1
22µF
+
VOUT
3.3V
C2
100µF
VDD
CE
NC
NC
GND
VDD
D1
SB02-03C
EXT
SW
V
IN
≧0.9V
L1
88µH
NC
AIC1640
CE
NC
NC
GND
V
IN
≧
0.9V
L1
33µH
D1
1N5819
C1
10nF
R1
300
EXT
SW
NC
Q1
2SD2150
AIC1640
3.3V Output Step-Up DC/DC Converter
3.3V/100mA Step-Up DC/DC Converter
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
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