AP1601 Datasheet, PDF (1/12 Pages) Anachip Corp – Step-Up DC/DC Converter

AP1601
STEP-UP DC/DC CONVERTER
Features
General Description
• 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 Packages: MSOP-8L and MSOP-10L.
• MSOP-8L and MSOP-10L: Available in “Green”
Molding Compound (No Br, Sb)
• Lead Free Finish / RoHS Compliant (Note 1)
The AP1601 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 3.3V
or 5V. The AP1601 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 100KHz (max.) switching
rate results in smaller passive components. The space saving
MSOP packages make the AP1601 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
Typical Application Circuit
V_IN
+
100uF
22uH
ON
OFF
Low- Battery
Detect In
SHDN
LBI
REF
0.1uF
GND
LX
OUT
LBO
FB
Adj Output (1.8V to 4.0V)
+ ^{up to 300 mA}
R5
220uF
Low- Battery
Detect OUT
Vout=1.2× (1+ ^R5 )
R6
R6 ^{R6 Suggest 100K~200K}
FB=Vout, Vout=3.3V
FB=GND, Vout=5V
AP1601 Rev. 5
1 of 12
www.diodes.com
SEPTEMBER 2009
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