AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
FEATURES
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DESCRIPTION
The AIC1638 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 2.7V, 3.0V, 3.3V, or
5V. The AIC1638 starts up from below 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.
The PFM control circuit operating in 100KHz (max.)
switching rate results in smaller passive
components. The space saving SOT-89 and TO-92
packages make the AIC1638 an ideal choice of
DC/DC converter
for space conscious
applications, like pagers, electronic cameras, and
wireless microphones
Guaranteed Start-Up from below 0.9 V.
High Efficiency.
Low Quiescent Current.
Few Number of External Components needed.
Low Ripple and Low Noise.
Fixed Output Voltage: 2.7V, 3.0V, 3.3V, and 5V.
Space Saving SOT-89 and TO-92 Packages.
APPLICATIONS
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Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
TYPICAL APPLICATION CIRCUIT
V
IN
+
C2
47µF
L1
88µH
D1
V
OUT
SW
AIC1638-27
AIC1638-30
AIC1638-33
AIC1638-50
GND
VOUT
+
C1
22µF
One Cell 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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AIC [ ANALOG INTERGRATIONS CORPORATION ]
