The ADP2109 is a high efficiency, low quiescent current package in an ultrasmall 5-bump WLCSP package
Step-down DC/DC converter, which has a built-in discharge switch that automatically discharges the output capacitor.
The overall solution requires only three small external components. It uses a patented high-speed current-mode, constant-frequency PWM control scheme with excellent stability and transient response. The ADP2109 features a power-saving mode that reduces the switching frequency at light loads, ensuring maximum battery life in portable applications.
The ADP2109 has an input voltage range of 2.3 V to 5.5 V and can be operated from single Li-Ion or Li-Polymer batteries, multiple alkaline or nickel-metal hydride batteries, PCMCIA, USB, and other standard supplies. A maximum load current of 600 mA can be achieved over the input voltage range. The ADP2109 can be supplied with fixed output voltages of 1.8 V, 1.2 V, and 1.0 V. All versions include a built-in power switch and synchronous rectifier that requires a minimum number of external components and achieves high efficiency. The ADP2109 has built-in soft-start and internal compensation. When shutdown is performed through logic control, the input is disconnected from the output, and the ADP2109 draws less than 1 μA from the input supply.
Other key features include undervoltage lockout to prevent deep battery discharge and soft-start to prevent input current overshoot at startup. The ADP2109 is available in a 5-bump WLCSP package.
Other key features include undervoltage lockout to prevent deep battery discharge and soft-start to prevent input current overshoot at startup. The ADP2109 is available in a 5-bump WLCSP package.
ADP2108With the same features and operation as the ADP2109, but without a discharge switch, the ADP2108 is available in both WLCSP and TSOT packages.
Advantages and features
- Peak efficiency: 95%
- Discharge switch function
- Fixed frequency operation: 3 MHz
- Quiescent current: 18 μA typical
- Load current: 600 mA maximum
- Input voltage: 2.3 V to 5.5 V
- Small multilayer inductors and capacitors are used
- Current mode architecture for fast load and line transient response
- 100% duty cycle low dropout mode
- Built-in synchronous rectifier
- Internal compensation
- For more features, please refer to the data sheet