AIC1630 Datasheet, PDF (1/11 Pages) Analog Intergrations Corporation – 2-Cell, Step-Up DC/DC Converter Controller

AIC1630
2-Cell, Step-Up DC/DC Converter Controller
FEATURES
Adjustable Output Voltage with Two Resistors
(AIC1630A).
Power-Saving Shutdown Mode (7µA typical).
120KHz Switching Rate.
On-Chip Low Battery Detector.
APPLICATIONS
Palmtop & Notebook Computers.
Battery Charger Supply.
Cellular Telephone.
LCD Contrast Supply.
Flash Memory Programmer.
Battery Backup Supplies.
Portable Instruments.
DESCRIPTION
The AIC1630 is a DC-DC converter designed to
drive an external power switch for more flexibility,
especially in higher voltage and larger power
applications. Typically six components are
required to set up a step up configuration easily
achieving efficiency beyond 80%. A few more
components are required to set up a step down
configuration delivering 4A load current with 83%
typical efficiency, 86% at 2A load, and 300µA
quiescent current.
The output voltage is internally set to 3V, 3.3V, 5V
or externally set to an arbitrary value below
breakdown voltage of the power switch. Logic-
controlled shutdown mode is provided for power
saving. The low battery detector can be also
configured as a linear regulator.
120KHz switching rate reduces the inductor size.
Inductors of 25µH to 50µH inductance are
recommended for most applications.
TYPICAL APPLICATION CIRCUIT
+V_OUT
3.3V
LOAD
+V_IN
L
D1
1N5819
100Ω
R3
+
C1
5nF C2
Q1
1
270Ω
R4
SD
VOUT
VIN
LBI
EXT
LBO
SGND
CGND
AIC1630
Note : V_IN ≥ 1.8V , V_OUT ≤ 7V
High Efficiency Step-Up DC/DC Converter
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1630-05
TEL: [phone] FAX: [phone]
www.analog.com.tw
1