Features and Benefits
- Input voltage range: 2.4 V to 5.5 V
- Low standby current: 1 μA
- Switching frequency: 3 MHz
- I2C interface
- Synchronous Buck 1 regulator: 600 mA
- Synchronous Buck 2 regulator: 250 mA
- Low dropout regulator (LDO): 150 mA
- Internal compensation
- Internal soft start
- Thermal shutdown
- 20-lead 4 mm × 4 mm LFCSP
The ADP5020 provides a highly integrated power solution that includes all of the power circuits necessary for a digital imaging module. It comprises two step-down dc-to-dc converters, one LDO, and a power sequence controller. All dc-to-dc converters integrate power pMOSFETs and nMOSFETs, making the system simpler and more compact and reducing the cost. The ADP5020 has digitally programmed output voltages and buck converters that can source up to 600 mA. A fixed frequency operation of 3 MHz enables the use of tiny inductors and capacitors. The buck converters use a voltage mode, constant-frequency PWM control scheme, and the synchronous rectification is implemented to reduce the power loss. The Buck 1 regulator operates at up to 93% efficiency.
The ADP5020 provides high performance, reduces component count and size, and is lower in cost when compared to conventional designs.
The ADP5020 runs on input voltage from 2.4 V to 5.5 V and supports one-cell lithium-ion (Li+) batteries. The high performance LDO maximizes noise suppression. The ADP5020 can be activated via an I2C® interface or through a dedicated enable input. During logic-controlled shutdown, the input is disconnected from the output source, and the part draws 1 μA typical 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 ADP5020 is available in a 20-lead LFCSP.
- Digital cameras, handsets
- Mobile TVs
Markets and Technologies
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
The evaluation system is composed of a motherboard and a daughterboard. The motherboard provides the I2C® signals from the computer USB port and generates the I/O voltages and digital high and low signals for the daughterboard. The motherboard features a 3.3 V regulator (VBOARD) a 3.7 V regulator (VBATT) and a 2.0 V regulator (VDDIO). VDDIO is the digital I/O voltage supplying the I2C interface and the control pins. VBOARD is the motherboard logic supply while VBATT provides power to the daughterboard. Jumpers on the top left of the motherboard define whether the internal regulators are supplied from the USB port or from external supplies connected to J10. The VBUS line from the USB connector powers the mother-board regulators when Jumper LK8 to Jumper LK10 are in the USB position. Connector J10 provides supply voltages for the motherboard and daughterboard when Jumper LK8 to Jumper LK10 are in the EXT position.
The daughterboard contains numerous jumpers, LEDs, and test points for easy evaluation and monitoring of the board.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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