AIC1640 Datasheet, PDF (1/2 Pages) Analog Intergrations Corporation – LOW VOLTAGE STEP-UP DC/DC CONVERTER

ADVANCE INFORMATION
■ 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.
■ APPLICATIONS
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
■ TYPICAL APPLICATION CIRCUIT
AIC1640
LOW VOLTAGE STEP-UP DC/DC CONVERTER
SPEC NO: DS-1640-P1
■ 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.
C1 ₊
22µF
VOUT
3.3V
VDD
CE
D1
SB02-03C
EXT
NC
SW
NC
V_IN
≧0.9V
L1
88µH
NC
GND
AIC1640
3.3V Output Step-Up DC/DC Converter
+ _C2
100µF
V_OUT
3.3V/100mA
VDD
CE
D1
L1
1N5819
V_{IN 33µH}
≧0.9V
Q1
C1
10nF
2SD2150
R1
EXT
NC
SW
NC
NC
GND
AIC1640
300
3.3V/100mA 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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