AP1603
Step-Up DC/DC Converter
Features
-A Guaranteed Start-Up from less than 0.9 V.
-High Efficiency.
-Low Quiescent Current.
-Less Number of External Components needed.
-Low Ripple and Low Noise.
-Space Saving
Pb-Free
Packages: SOT23-6
General Description
The AP1603 is a high efficiency step-up DC/DC
converter for applications using 1 to 2 NiMH battery
cells. Only three external components are required
to deliver a fixed output voltage of 3.3V. The
AP1603 starts up from less than 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 150KHz (max.)
switching rate results in smaller passive
components. The space saving SOT23-6 packages
make the AP1603 an ideal choice of DC/DC
converter for space conscious applications, like
pagers, electronic cameras, and wireless
microphones.
Applications
-Pagers.
-Cameras.
-Wireless Microphones.
-Pocket Organizers.
-Battery Backup Suppliers.
-Portable Instruments.
Pin Assignments
Pin Descriptions
Description
1.2V Reference Voltage. Bypass with a 0.1µF
REF
capacitor.
Power Output. OUT provides bootstrap power
OUT
to the IC.
N-Channel and P-Channel Power MOSFET
LX
Drain
GND Ground
Shutdown Input. Drive high (>80% of V
OUT
) for
operating mode. Drive low (<20% of V
OUT
) for
SHDN
shutdown mode. Connect to OUT for normal
operation.
FB Feedback
Name
FB 1
GND 2
REF 3
SOT23-6L
AP1603
6 SHDN
5 OUT
7 LX
4
Ordering Information
AP1603
Package
W: SOT23-6L
X
X
Packing
Blank : Tube
A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0 Jun. 3, 2004
1/8
ANACHIP [ ANACHIP CORP ]
