AP1609
PWM/PFM Dual Mode Step-up DC/DC Converter
Features
- Input Voltage Range: 2.5~6V
- Output Voltage Range: 3.0~17V（±2.5%）
- PWM/PFM Switching Control
- Oscillator Frequency: 300KHz（±20%）
- High Efficiency: 91%（Typ .）
- Stand-by Current: I
STB
＝1µA.（Typ.）
- Built-in internal N-Channel MOS
-
Pb-Free
Package: SOP-8L/TSSOP-8L
General Descriptions
The AP1609 is high efficient step-up DC/DC
converter. Large output current is possible having
a built in internal N channel MOSFET, and using an
external coil and diode.
Output voltage is programmable with 1.23V of
standard voltage supply internal, and using
externally connected components, output voltage
（FB）
can be set up at will.
With a 300KHz switching frequency, the size of the
external components can be reduced. Control
switches from PFM to PWM during light loads with
the AP1609（PWM/PFM switchable）and the series
is highly efficient from light loads to large output
currents.
During stand-by time
（CE
pin “Low”）, current
consumption is reduced to 1µA.
Applications
- Electronic Information Organizers
- Palmtops
- Cellular and portable phones
- Portable Audio Systems
- Various Multi-function Power Supplies
Pin Assignment
Pin Descriptions
Pin Pin No.
Description
Name SOP TSSOP
FB
3
5
Feedback pin
Chip Enable:
CE
1
4
H: Enable
L: Disable
Vcc
2
2、3 IC signal power supply pin
PGND 4
6、7 Power MOSFET GND
Switch
Pin.
Connect
external
inductor/diode
8
LX 5、6
here. Minimize trace area
at this pin to reduce EMI.
GND 7、8
1
GND Pin
CE 1
Vcc 2
FB 3
PGND 4
AP1609
8 GND
7 GND
6 LX
5 LX
SOP-8L
GND
Vcc
Vcc
CE
1
2
3
4
AP1609
8
7
6
5
LX
PGND
PGND
FB
TSSOP-8L
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.1.2 Mar.25, 2005
1/8
ANACHIP [ ANACHIP CORP ]
