AIC1631
2-Cell, 500mA, Step-Up DC/DC Converter
FEATURES
High Efficiency 90%.
Adjustable Output Voltage with Two Resistors
(AIC1631A)
Power-Saving Shutdown Mode (7µA typical).
Internal 2A Switch.
120KHz Switching Rate.
Adjustable Switch Current Limit.
On-Chip Low Battery Detector.
DESCRIPTION
The AIC1631 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 exter-
nally set to an arbitrary value below breakdown
voltage of the power switch for AIC1631A. Effi-
ciency beyond 87% can be easily achieved at
100mA load with 2.2V to 3V input voltages.
APPLICATIONS
Palmtop & Notebook Computers.
Pocket Organizers.
Cameras.
Pagers.
Battery Backup Supplies.
Portable Instruments.
Logic-controlled shutdown mode is provided for
power saving. Switch current limit can be pro-
grammed with a resistor. The low battery de-
tector 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 25µH to 50µH inductance are
commended for most applications.
re-
TYPICAL APPLICATION CIRCUIT
100Ω
+V
IN
L
1N5819
D1
+V
OUT
(3.3V)
+
C2
100µF
Note: V
IN
≥
1.8V, V
OUT
≤
7V
R1
50µH
+
NORMAL
C1
100µF
R
ILIM
ILIM/SD
VIN
SW
SGND
VOUT
LBI
LBO
CGND
SD
LOAD
AIC1631
High Efficiency Step-Up DC/DC Converter
Analog Integrations Corporation
DS-1631-04 Dec 27, 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 ]
