Features: 95% Efficiency or up
700mA Guaranteed Output Current.
Adjustable Output Voltage from 0.75V to VIN of a range from +2.5V to 6.5V.
Very Low Quiescent Current: 35uA (Typ.).
Fixed- 500KHz or Adjustable Frequency Synchronous PWM Operation.
Synchronizable external Switching Frequency up to 1MHz.
Accurate Reference: 0.75V (¡Ó2%).
100% Duty Cycle in Dropout.
Low Profile 8-Pin MSOP Package.
ApplicationPDAs.
Digital Still Cameras.
Handy-Terminals.
Cellular Phones.
CPU I/O Supplies.
Cordless Phones.
Notebook Chipset Supplies.
Battery-Operated Devices (4 NiMH/ NiCd or 1 Li-ion Cells). DescriptionThe AIC1554 is a low-noise pulse-width-modulated (PWM) DC-DC step-down converter. It powers logic circuits in PDAs and small wireless systems such as cellular phones, handy-terminals.
The device features an internal synchronous rectifier for high conversion efficiency. Excellent noise characteristics and fixed-frequency operation provide easy post-filtering. The AIC1554 is ideally suited for Li-ion battery applications. It is also suitable for +3V or +5V fixed input applications. The device can operate in either one of the following four modes.
(1) Forced PWM mode operates at a fixed frequency regardless of the load.
(2) Synchronizable PWM mode allows the synchronization by using an external switching frequency with a minimum harmonics.
(3) PWM/PFM Mode extends battery life by switching to a PFM pulse-skipping mode under light loads.
(4) Shutdown mode sets device to standby, reducing supply current to 0.1gA or under.
The AIC1554 can deliver over 700mA output current. The output voltage can be adjusted from 0.75V to VIN ranging from +2.5V to +6.5V. Other features of the product include low quiescent current, low dropout voltage, and a 0.75V reference of 2% accuracy. It is available in a space-saving 8-pin MSOP package.
The AIC1554 is a low-noise pulse-width-modulated (PWM) DC-DC step-down converter. It powers logic circuits in PDAs and small wireless systems such as cellular phones, handy-terminals.
The device features an internal synchronous rectifier for high conversion efficiency. Excellent noise characteristics and fixed-frequency operation provide easy post-filtering. The AIC1554 is ideally suited for Li-ion battery applications. It is also suitable for +3V or +5V fixed input applications. The device can operate in either one of the following four modes.
(1) Forced PWM mode operates at a fixed frequency regardless of the load.
(2) Synchronizable PWM mode allows the synchronization by using an external switching frequency with a minimum harmonics.
(3) PWM/PFM Mode extends battery life by switching to a PFM pulse-skipping mode under light loads.
(4) Shutdown mode sets device to standby, reducing supply current to 0.1£gA or under.
The AIC1554 can deliver over 700mA output current. The output voltage can be adjusted from 0.75V to VIN ranging from +2.5V to +6.5V. Other features of the product include low quiescent current, low dropout voltage, and a 0.75V reference of ¡Ó2% accuracy. It is available in a space-saving 8-pin MSOP package.
AIC1554 Data Sheet
