ADP1822: PWM, Step-Down DC-to-DC Controller with Margining and Tracking

The ADP1822 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.

产品应用领域 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

ADP1822 特点

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

ADP1822 功能框图

ADP1822 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
ADP1822-BL1-EVZ	量产	评估板	-	待定
ADP1822-BL2-EVZ	量产	评估板	-	待定
ADP1822-EVAL	量产	None Available	24	工业
ADP1822ARQZ-R7	量产	24 ld QSOP	24	工业