ADP3020 Datasheet | Analog Devices

a High-Efficiency Notebook puter Power Supply Controller ADP3020 GENERAL DESCRIPTION Features Wide Input Voltage Range: 4.5 V to 25 V High Conversion Efficiency > 96% Integrated Current Sense- No External Resistor Required Low Shutdown Current: 7 ␮ A (Typical) Dual Synchronous Buck Controllers with Selectable PWM/Power-Saving Mode Operation Built-In Gate Drive Boost Circuit for Driving External N-Channel MOSFETs Two Independently Programmable Output Voltages Fixed 3.3 V or Adjustable (1.25 V to VIN- 0.5 V) Fixed 5 V or Adjustable (1.25 V to VIN- 0.5 V) Programmable PWM Frequency Integrated Linear Regulator Controller Extensive Circuit Protection Functions 38-Lead TSSOP Package APPLICATIONS Notebook puters and PDAs Portable Instruments General Purpose DC-DC Converters The ADP3020 is a highly efficient dual synchronous buck switching regulator controller optimized for converting the battery or adapter input into the system supply voltages required in notebook puters. The ADP3020 uses a dual-mode PWM/Power Saving Mode architecture to maintain efficiency over a wide load range. The oscillator frequency can be programmed for 200 k Hz, 300 k Hz, or 400 k Hz operation, or it can be synchronized to an external clock signal of up to 600 k Hz. The ADP3020 provides accurate and reliable short circuit protection using an internal current sense circuit, which reduces cost and increases overall efficiency. Other protection Features include programmable soft-start, UVLO, and integrated output undervoltage/overvoltage protection. The ADP3020 contains a linear regulator controller that is designed to drive an external P-channel MOSFET or PNP transistor. The linear regulator output is adjustable, and can be used to generate the auxiliary voltages required in many laptop designs. FUNCTIONAL BLOCK DIAGRAM VIN 5.5V TO 25V 1.20V 5V LINEAR REF Q1 L1 3.3V 5V SMPS Q4 3.3V SMPS Q2 Q3 L2 5V SS5 SS3 Q5 LINEAR CONTROLLER POWER-ON RESET PWRGD 2.5V REV. 0 Information...