AIC1642
3-Pin One-Cell Step-Up DC/DC Converter
FEATURES
DESCRIPTION
A Guaranteed Start-Up from less than 0.9 V.
High Efficiency.
Low Quiescent Current.
Less Number of External Components needed.
Low Ripple and Low Noise.
Fixed Output Voltage: 2.2V, 2.7V, 2.8V, 3.0V,
3.1V, 3.3V, 3.7V, 4.5V and 5V.
Space Saving Packages: SOT-89, TO-92 (3 pin)
and SOT-23 (3 & 5 pin).
The AIC1642 is a high efficiency step-up DC/DC
converter for applications using 1 to 4 NiMH battery cells. Only three external components are required to deliver a fixed output voltage of 2.2V,
2.7V, 2.8V, 3.0V, 3.1V, 3.3V, 3.7V, 4.5V or 5V.
The AIC1642 starts up from less than 0.9V input
with 1mA load. Pulse Frequency Modulation
scheme brings optimized performance for applications with light output loading and low input voltages. The output ripple and noise are lower compared with the circuits operating in PSM mode.
APPLICATIONS
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
The PFM control circuit operating in 100KHz
(max.) switching rate results in smaller passive
components. The space saving SOT-23, SOT89 and TO-92 packages make the AIC1642 an
ideal choice of DC/DC converter for space conscious applications, like pagers, electronic cameras, and wireless microphones.
■ TYPICAL APPLICATION CIRCUIT
VIN
VOUT
VIN
D1
GS SS12
L1
100μH
D1
GS SS12
L1
100μH
+
C1
22μF SW
C1
SW
22μF
VOUT
+ C2
47μF
ENABLE
+ C2
47μF
AIC1642
AIC1642
+
VOUT
VOUT
EN
GND
GND
One Cell Step-Up DC/DC Converter
Analog Integrations Corporation
One Cell Step-Up DC/DC Converter with Enable Control
Si-Soft Research Center
DS-1642G-05 20101029
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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