ADP1864 Datasheet | Analog Devices

FEATURES Wide input voltage range: 3.15 V to 14 V Wide output voltage range: 0.8 V to input voltage Pin-to-pin patible 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 supply current 235 μA quiescent supply current Short-circuit and overvoltage protection Small 6-lead TSOT package Supported by ADIsim Power™ design tool APPLICATIONS Wireless devices 1- to 3-cell Li-Ion battery-powered applications Set-top boxes Processor core power supplies Hard disk drives GENERAL DESCRIPTION The ADP1864 is a pact, 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 ±1.25% 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, and 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 undervoltage protection. Current-mode control provides fast and stable load transient performance, while the 580 k Hz 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 during dropout. The ADP1864 operates over the - 40°C to +125°C temperature range and is available in a small, low profile, 6-lead TSOT package. TYPICAL APPLICATIONS DIAGRAM 470p F 25kΩ 68p F 1 P PGATE 6 2 GND IN 5 0.03Ω VIN = 3.15V TO 14V 10µF 80.6kΩ 3 FB 174kΩ CS 4 5µH 2.5V, 2.0A 47µF Figure 1. 05562-001 Rev. C Information...