ADP3153 Datasheet | Analog Devices

FEATURES 5-Bit Digitally Programmable 1.8 V to 3.5 V Output Voltage Dual N-Channel Synchronous Driver Total Output Accuracy ؎ 1% (0؇C to +70؇C) High Efficiency Current-Mode Operation Short Circuit Protection Power Good Output Overvoltage Protection Crowbar On-Board Linear Regulator Controller VRM 8.2 patible Narrow Body TSSOP 20-Lead Package APPLICATIONS Desktop PC Power Supply for: Pentium II Processor Deschutes Processor Pentium Pro Processor Pentium Processor AMD- K6 Processor VRM Modules 5-Bit Programmable Dual Power Supply Controller for Pentium® II Processor ADP3153 GENERAL DESCRIPTION The ADP3153 is a highly efficient synchronous switching regulator controller and a linear regulator controller. The switching regulator controller is optimized for Pentium II and Deschutes Processor applications where 5 V is stepped down to a digitally controlled output voltage between 1.8 V and 3.5 V. Using a 5-bit DAC to read a voltage identification (VID) code directly from the processor, the ADP3153 uses a current mode constant offtime architecture to generate its precise output voltage. The ADP3153 drives two N-channel MOSFETS in a synchronous rectified buck converter, at a maximum switching frequency of 250 k Hz. Using the remended loop pensation and guidelines, the ADP3153 provides a dc/dc converter that meets Intel’s stringent transient specifications with a minimum number of output capacitors and smallest footprint. Additionally, the current mode architecture also provides guaranteed short circuit protection and adjustable current limiting. The ADP3153’s linear regulator controller drives an external N-channel device. The output voltage is set by the ratio of the external feedback resistors. The controller has been designed for excellent load transient response. VCC +12V VIN +5V + R1 VIN +5V IRL2703 1000␮F 35k⍀ 20k⍀ 22␮F 1␮F SD CMP VCC DRIVE1 IRL3103 SENSE+ R2 L 2.5␮H VLDO SENSE- FB DRIVE2 IRL3103 PGND VID0- VID4 10BQ015 1n F RSENSE 7m⍀ +...