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ADP1821

Analog Devices
Part Number ADP1821
Manufacturer Analog Devices
Description Step-Down DC-to-DC Controller
Published Jan 14, 2007
Detailed Description www.DataSheet4U.com Step-Down DC-to-DC Controller ADP1821 FEATURES Wide power-input voltage range: 1 V to 24 V Chip sup...
Datasheet PDF File ADP1821 PDF File

ADP1821
ADP1821

Overview
www.
DataSheet4U.
com Step-Down DC-to-DC Controller ADP1821 FEATURES Wide power-input voltage range: 1 V to 24 V Chip supply voltage range: 3 V to 5.
5 V Wide output voltage range: 0.
6 V to 85% of input voltage 1% accuracy, 0.
6 V reference voltage All N-channel MOSFET design for low cost Fixed-frequency operation 300 kHz, 600 kHz, or synchronized operation up to 1.
2 MHz No current sense resistor required Power-good output Programmable soft start with reverse current protection Soft start, thermal overload, current-limit protection Undervoltage lockout 10 μA shutdown supply current Small, 16-lead QSOP GENERAL DESCRIPTION The ADP1821 is a versatile and inexpensive, synchronous, pulse width-modulated (PWM), voltage-mode, step-down controller.
It drives an all N-channel power stage to regulate an output voltage as low as 0.
6 V.
The ADP1821 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 ADP1821 is well suited for a wide range of high power applications, such as DSP and processor core power in telecom, medical imaging, high performance servers, and industrial applications.
It operates from a 3.
0 V to 5.
5 V supply with a power input voltage ranging from 1.
0 V to 24 V.
The ADP1821 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 be synchronized to an external clock to achieve switching frequencies between 300 kHz and 1.
2 MHz.
The ADP1821 includes soft start protection to limit the 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 utilizing external MOSFET sensing.
The ADP1821 operates over the –40°C to +85°C temperature range and is available in a 16-lead QSOP.
97 96 D1 PVCC + POWER INPUT 2.
5V TO 20V CIN1 + 2.
2µF 25V ...


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