ADP1823: Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking

The ADP1823 is a versatile, dual, interleaved, synchronous, PWM buck controller that generates two independent output rails from an input of 3.7 V to 20 V, with a power input voltage that ranges from 1 V to 24 V. Each controller can be configured to provide output voltages from 0.6 V to 85% of the input voltage and is sized to handle large MOSFETs for point-of-load regulators. The two channels operate 180° out of phase, reducing stress on the input capacitor and allowing smaller, low cost components. The ADP1823 is ideal for a wide range of high power applications, such as DSP and processor core I/O power, and general-purpose power in telecommunications, medical imaging, PCs, gaming, and industrial applications.

The ADP1823 operates at a pin-selectable, fixed switching frequency of either 300 kHz or 600 kHz, minimizing external component size and cost. For noise sensitive applications, it can also be synchronized to an external clock to achieve switching frequencies between 300 kHz and 1 MHz. The ADP1823 includes soft start protection to prevent inrush current from the input supply during startup, reverse current protection during soft start for precharged outputs, as well as a unique adjustable lossless current-limit scheme using external MOSFET sensing.

For applications requiring power supply sequencing, the ADP1823 also provides tracking inputs that allow the output voltages to track during startup, shutdown, and faults. This feature can also be used to implement DDR memory bus termination.

The ADP1823 is specified over the -40°C to +125°C junction temperature range and is available in a 32-lead LFCSP.

产品应用领域 Applications

Telecommunications and networking systems
Medical imaging systems
Base station power
Set-top boxes
Printers
DDR termination

ADP1823 特点

Fixed-frequency operation: 300 kHz, 600 kHz, or synchronized operation up to 1 MHz
Supply input range: 3.7 V to 20 V
Wide power stage input range: 1 V to 24 V
Interleaved operation results in smaller, low cost input capacitor
All-N-channel MOSFET design for low cost
±0.85% accuracy at 0°C to 70°C
Soft start, thermal overload, current-limit protection
10 μA shutdown supply current
Internal linear regulator
Lossless RDSON current-limit sensing
Reverse current protection during soft start for handling precharged outputs
Independent Power OK (POK) outputs

ADP1823 功能框图

ADP1823 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
ADP1823-EVAL	量产	评估板	32	商业
ADP1823ACPZ-R7	量产	32 ld LFCSP (5x5mm CP-32-2)	32	商业