AIC1633
2-Cell, 200mA, Step-Up DC/DC Converter
FEATURES
High Efficiency Up To 87%.
Adjustable Output Voltage with Two Resistors
(AIC1633A)
Power-Saving Shutdown Mode (7µA typical).
Internal 0.8A Switch.
120KHz Switching Rate.
Adjustable Switch Current Limit.
On-Chip Low Battery Detector.
DESCRIPTION
The AIC1633 is a high efficiency step up DC/DC
converter. Only four external components are
required to deliver a fixed voltage of 3V, 3.3V, or
5V. The output voltage can be externally set to
an arbitrary value below breakdown voltage of
the power switch for AIC1633A. Efficiency
beyond 83% can be easily achieved at 70mA
load with 2.2V to 3V input voltages.
APPLICATIONS
Pocket Organizers.
Electronic Dictionaries.
Cameras.
Pagers.
Bar-Code Scanners.
LCD Displays.
Battery Backup Supplies.
Portable Instruments.
Logic-controlled shutdown mode is provided for
power saving. Switch current limit can be
programmed with a resistor. The low battery
detector can be configured as a linear regulator
or a burst mode controller performing an
extremely low supply current operation.
120KHz switching rate reduces the inductor size.
Inductors of 47µH to 150µH inductance are
recommended for most applications.
TYPICAL APPLICATION CIRCUIT
+V
IN
470Ω
R1
100µH
L
+
NORMAL
10K
22µF
C1
SD
R
ILIM
ILIM/SD
VIN
SW
VOUT
LBI
LBO
CGND
+V
OUT
(3.3V)
+
LOAD
1N5819
D1
22µF
C2
TATAN
SGND
NOTE: V
IN
≥1.8V,
V
OUT
≤7V
AIC1633
High-Efficiency Step-Up DC/DC Converter
Analog Integrations Corporation
DS-1633-03 Mar 15, 00
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
AIC [ ANALOG INTERGRATIONS CORPORATION ]
