1A Dual Synchronous Step-down DC/DC Converter
Dual 1A Output
2.5V to 5.5V Input Range
Accurate Reference 0.6V Provides Low Out-
Adjustable Output Voltage
Up to 95% Efficiency
Stable with Low ESR Output Ceramic Ca-
No Schottky Diode Required.
65µA Quiescent Current per Channel.
100% Duty Cycle in Low Dropout Operation.
1.5MHz Fixed-Frequency PWM Operation
Digital Still Cameras
Wireless and DSL Modems
Notebook Chipset Supplies.
PDAs and Handy-Terminals
Battery-Operated Devices (1 Li-Ion or 3
The AIC2309 is a dual output, low-noise,
pulse-width-modulated (PWM), DC-DC step-
down converter. It powers logic and transmit-
ters in small wireless systems such as cellu-
lar phones, communicating PDAs, and
The device features an internal synchronous
rectifier for high efficiency; it requires no ex-
ternal Schottky diode. Internally fixed-
frequency 1.5MHz operation provides easy
post-filtering and allows the use of small in-
ductors and capacitors. Shutdown mode
places the device in standby, reducing sup-
ply current to under 1µA..
Other features of the AIC2309 include high
efficiency, soft start, over temperature pro-
tection, and over current protection. It is
available in a space-saving 12-pin DFN.
TYPICAL APPLICATIONS CIRCUIT
Fig. 1 Adjustable Output Voltage Step-Down DC/DC Converter
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.