ADP1822
PWM ，降压型DC- DC控制器具有裕度和跟踪 PWM, Step-Down DC-to-DC Controller with Margining and Tracking
Product Details
The is a versatile and inexpensive synchronous voltage-mode PWM step-down controller. It drives an all N-channel power stage to regulate an output voltage as low as 0.6 V.
The ADP1822 regulated output can track another power supply and can be dynamically adjusted up or down with the controller’s margining-control inputs, making it ideal for high reliability applications. It is well suited for a wide range of high power applications, such as DSP power and processor core power in telecommunications, medical imaging, high performance servers, and industrial applications. It operates from a 3.7 V to 5.5 V supply with power input voltage ranging from 1.0 V to 24 V.
The ADP1822 can operate at any frequency between 300 kHz and 1.2 MHz, either by synchronizing with an external source or an internally generated, logic-controlled clock of 300 kHz or 600 kHz. It includes an adjustable soft start to allow sequencing and quick power-up while preventing input inrush current. Output reverse-current protection at startup prevents excessive output voltage excursions. The adjustable, virtually lossless current-limit scheme reduces external part count and improves efficiency.
The ADP1822 operates over the −40°C to +125°C junction temperature range and is available in a 24-lead QSOP package.
**Applications**
- .
- Telecommunications and networking systems
- .
- High performance servers
- .
- Medical imaging systems
- .
- DSP core power supplies
- .
- Microprocessor core power supplies
- .
- Mobile communication base stations
- .
- Distributed power
### Features and Benefits
- .
- Wide power input voltage range: 1 V to 24 V
- .
- Chip supply voltage range: 3.7 V to 5.5 V
- .
- Wide output voltage range: 0.6 V to 85% of input voltage
- .
- 1% accuracy, 0.6 V reference voltage
- .
- Output voltage margining control
- .
- Output voltage tracking
- .
- All N-channel MOSFET
- .
- 300 kHz, 600 kHz, or up to 1.2 MHz synchronized frequency
- .
- No current sense resistor required
- .
- Power-good output
- .
- Programmable soft start with reverse current protection
- .
- Current-limit protection
