ADP3025 Datasheet | Analog Devices

High Efficiency Dual Output Power Supply Controller ADP3025 Features Wide input voltage range: 5.5 V to 25 V High conversion efficiency > 96% Integrated current sense- no external resistor required Low shutdown current: 19 µA (typical) Voltage mode PWM with input feed-forward for fast line transient response Dual synchronous buck controllers Built-in gate drive boost circuit for driving external high-side N-channel MOSFET 2 independently programmable output voltages: Fixed 3.3 V or adjustable (800 m V to 6.0 V) Fixed 5 V or adjustable (800 m V to 6.0 V) Programmable PWM frequency Integrated linear regulator controller Extensive circuit protection functions GENERAL DESCRIPTION The ADP3025 is a highly efficient, dual synchronous buck switching regulator controller optimized for converting a battery or adapter input into the supply voltage required in portable products and industrial systems. The oscillator frequency can be programmed for 200 k Hz or 300 k Hz operation, or can be synchronized to an external clock signal of up to 350 k Hz. The ADP3025 provides accurate and reliable short-circuit protection by using an internal current sense circuit that reduces cost and increases overall efficiency. Other protection Features include programmable soft start, UVLO, and integrated output undervoltage/overvoltage protection. The ADP3025 contains a linear regulator controller designed to drive an external N-channel MOSFET. The linear regulator output is adjustable and can be used to generate auxiliary supply voltages. The ADP3025 is specified over the 0°C to 70°C mercial temperature range and is available in a 38-lead TSSOP package. APPLICATIONS Portable instruments General-purpose dc-to-dc converters SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM VIN 5.5V TO 25V PFO 5V LINEAR REGULATOR REF Q1 L1 5V SWITCHING CONTROLLER 3.3V SWITCHING CONTROLLER 3.3V Q2 800m V Q3 L2 5V Q4 SS5 SS3 Q5 LINEAR CONTROLLER POWER-ON RESET PWRGD 2.5V Figure 1. Rev. A Information furnished by...