ADP3088 Datasheet | Analog Devices

FEATURES 1 MHz PWM Frequency Automatic PWM to Power Saving Mode at Light Load Fully Integrated 1 A Power Switch 3% Output Regulation Accuracy over Temperature, Line, and Load 100% Duty Cycle Operation Simple pensation Output Voltage: 1.25 V to 10.5 V Small Inductor and MLC Capacitors Low Quiescent Current while Pulse Skipping Thermal Shutdown Fully Integrated Soft Start Cycle-by-cycle Current Limit APPLICATONS PDAs and Palmtop puters Notebook puters PCMCIA Cards Bus Products Portable Instruments GENERAL DESCRIPTION IN IN 1 MHz, 750 m A Buck Regulator ADP3088 FUNCTIONAL BLOCK DIAGRAM SW CURRENT SENSE PWM 1MHz AMP PARATOR S Q R DRV PROTECTION LOGIC (ILIM, OT) ERROR AMP gm RUN/STOP PARATORS FB SOFT-START TIMER P GND GND + REF 1.245V The ADP3088 is a high frequency, non-synchronous PWM step-down DC-DC regulator with an integrated 1A power switch in a space-saving MSOP8 package. It provides high efficiency, excellent dynamic response, and is very simple to use. The ADP3088’s 1 MHz switching frequency allows for small, inexpensive external ponents, and the current mode control loop is simple to pensate and eases noise filtering. It operates in PWM current mode under heavy loads and saves energy at lighter loads by switching automatically into Power Saving mode. Soft start is integrated pletely on chip, as is the cycle-by-cycle current limit. Capable of operating from 2.5 V to 11 V input, it is ideal for many applications, including portable, battery power applications, where local point-of-use power regulation is required. Supporting output voltages down to 1.25 V, the ADP3088 is ideal to generate low voltage rails, providing the optimal solution in its class for delivering power efficiently, responsively, and simply with minimal printed circuit board area. The device is specified over the industrial temperature range of -40 °C to +85°C. VIN 3.3V 10µF IN 0.1µF IN ADP3088 SW DRV GND FB 3.3µH VOUT 1.8V 10.0kΩ 1N5817 10µF 22.4kΩ GND P 4.7p F 220p F 20kΩ Figure 1....