Applications
The ADP2109 is a high efficiency, low quiescent current stepdown dc-to-dc converter with an internal discharge switch that allows automatic discharge of the output capacitor in an ultra small 5-ball WLCSP package.
The total solution only requires three tiny external components. It uses a proprietary high-speed current mode, constant frequency PWM control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2109 has a power save mode that reduces the switching frequency under light load conditions.
The ADP2109 runs on input voltages of 2.3 V to 5.5 V, which allow for single lithium or lithium polymer cell, multiple alkaline or NiMH cells, PCMCIA, USB, and other standard power sources. The maximum load current of 600 mA is achievable across the input voltage range.
The ADP2109 is available in fixed output voltages of 1.8 V, 1.2 V, and 1.0 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2109 has an internal soft start and internal compensation. During logic-controlled shutdown, the input is disconnected from the output and the ADP2109 draws less than 1 μA from the input source.
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-ball WLCSP.
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-ball WLCSP.
The ADP2108 provides the same features and operations as the ADP2109 without the discharge switch and is available in both WLCSP and TSOT packages.
Features and Benefits
| Power ManagementDesign Tools |
| Document | note |
| ADP2109: Compact 600 mA, 3 MHz, Step-Down Converter with Output Discharge Data Sheet (Rev. B) | PDF 1233 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| ADP2109ACBZ-1.0-R7 Last Time Buy | WLCSP Discription 5 Ball WLCSP (1.02x1.45) | REEL 3000 | -40 to 125C | 0 | 0.7 | Y |
| ADP2109ACBZ-1.2-R7 Last Time Buy | WLCSP Discription 5 Ball WLCSP (1.02x1.45) | REEL 3000 | -40 to 125C | 0 | 0.7 | Y |
| ADP2109ACBZ-1.5-R7 Last Time Buy | WLCSP Discription 5 Ball WLCSP (1.02x1.45) | REEL 3000 | -40 to 125C | 0 | 0.7 | Y |
| ADP2109ACBZ-1.8-R7 Last Time Buy | WLCSP Discription 5 Ball WLCSP (1.02x1.45) | REEL 3000 | -40 to 125C | 0 | 0.7 | Y |
