AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
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
G01 FEATURES
! 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.
G01 APPLICATIONS
! Pagers.
! Cameras.
! Wireless Microphones.
! Pocket Organizers.
! Battery Backup Suppliers.
! Portable Instruments.
G01 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
G01 TYPICAL APPLICATION CIRCUIT
D1
VOUT
SW
GND
AIC1638-27
AIC1638-30
AIC1638-33
AIC1638-50 C1
22µF
+
V
OUT
L1
88µH
V
IN
+ C2
47µF
One Cell Step-Up DC/DC Converter