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ADP1864

Analog Devices
Part Number ADP1864
Manufacturer Analog Devices
Description Constant Frequency Current-Mode Step-Down DC/DC Controller
Published Jan 14, 2007
Detailed Description www.DataSheet4U.com Constant Frequency Current-Mode Step-Down DC/DC Controller in TSOT ADP1864 FEATURES Wide input volt...
Datasheet PDF File ADP1864 PDF File

ADP1864
ADP1864

Overview
www.
DataSheet4U.
com Constant Frequency Current-Mode Step-Down DC/DC Controller in TSOT ADP1864 FEATURES Wide input voltage range: 3.
15 V to 14 V Wide output voltage range: 0.
8 V to input voltage Pin-to-pin compatible with LTC1772, LTC3801 Up to 94% efficiency 0.
8 V ±1.
25% reference accuracy over temperature Internal soft start 100% duty cycle for low dropout voltage Current-mode operation for good line and load transient response 7 μA shutdown current 235 μA quiescent supply current Short-circuit and overvoltage protection Small 6-lead TSOT package GENERAL DESCRIPTION The ADP1864 is a compact, inexpensive, constant-frequency current-mode step-down DC-to-DC controller.
The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.
8 V with ±2% accuracy, for up to 5 A load currents, from input voltages as high as 14 V.
The ADP1864 provides system flexibility by allowing accurate setting of the current limit with an external resistor, while the output voltage is easily adjustable using two external resistors.
The ADP1864 includes an internal soft start to allow quick power-up while preventing input inrush current.
Additional safety features include short-circuit protection, output overvoltage protection, and input under voltage protection.
Current-mode control provides fast and stable load transient performance, while the 580 kHz operating frequency allows a small inductor to be used in the system.
To further the life of a battery source, the controller turns on the external P-channel MOSFET 100% of the duty cycle in dropout.
The ADP1864 operates over the −40°C to +85°C temperature range and is available in a small, low profile, 6-lead TSOT package.
APPLICATIONS Wireless devices 1- to 3-cell Li-Ion battery-powered applications Set-top boxes Processor core power supplies Hard disk drives MOSFET = FDC638P 100 VOUT = 2.
5V 95 ADP1864 15kΩ 1 90 VIN = 3.
3V to 10V IN 5 0.
03Ω 10μF CS 4 5μH 2.
5V, 2.
0A 47μF 05562-001 COMP GND 470pF 2 85 3.
3V 80 75 4.
...


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