DA9025: 5 Channel Power Management Subsystem
The DA9025 is a very flexible circuit designed for low power systems which typically include both digital and analog functions. It is ideally suited to systems using advanced microcontrollers or DSPs which require separate core and peripheral supplies.
The DA9025 provides a basic system level power management solution, handling ON/OFF control, power sequencing and battery monitoring and can act as a core of a system. Additional functionality such as extra regulators or battery charging can be added using readily available standard components allowing the designer to quickly configure a complete system.
Integrated are four low dropout voltage regulators, using Dialog Semiconductor’s patented Smart Mirror ™ technology. Smart Mirror™ simplifies system design and delivers low power operation, whilst at the same time maintaining high dynamic performance. To allow optimum power consumption the DA9025 also includes a DCDC buck converter featuring integrated switching FETS to minimize external components.
Designed to offer great flexibility the DA9025 can operate with or without a host controller.
In addition to providing the regulated supplies the device monitors the power source for under and over voltage conditions and has internal thermal monitoring to protect against overstress.
The DA9025 is packaged in a small 24 lead 4x4mm QFN package, which coupled together with a low external component count, enables a complex power management solution to be realized in just 1cm² of PCB area.
Overview
Voltage regulator section highlights
- High power supply rejection, typically 80dB@ 1KHz
- Dynamic biasing for high efficiency
- Quiescent current typically 15µA/regulator @ 10mA
- Programmable output voltage
- Small external 2.2 1µF decoupling capacitors for low cost and PCB area
- Over current and thermal protected outputs
- High efficiency buck converter 0.85V-3.3V output
- Asynchronous mode for high efficiency at low load
System control section highlights
- 2 device enables ONKEY (active low) and EXTON( Active high )
- Supports standalone operation
- I2C control for additional functionality
- Watchdog function
- Overvoltage, undervoltage protection
- Hardware reset via ONKEY input
Package
*24 QFN 4x4 0.8mm, 0.5mm pitch
- Integrates core power management functions in portable equipment
- Standalone or µP controlled
- Small size 4x4QFN
- 4 high performance low dropout regulators
- RTC supply
- High efficiency DC-DC buck converter
- Supply monitoring
- Cellular telephones
- Digital still cameras
- PDA
- Portable instruments