ADP3152 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 Integrated Overvoltage Protection Crowbar 16-Lead SOIC Package VRM 8.2 patible APPLICATIONS Desktop PC Power Supply for: Pentium II Processor Pentium Pro Processor Pentium Processor AMD- K6 Processor VRM Modules VCC +12V 22␮F 1␮F VCC R1 SD CMP R2 CP 150p F AGND SENSE+ CT DRIVE1 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor ADP3152 GENERAL DESCRIPTION The ADP3152 is a highly efficient synchronous switching regulator controller optimized for Pentium II 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 ADP3152 uses a current mode constant off-time architecture to generate its precise output voltage. The ADP3152 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 ADP3152 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. VIN +5V + IRL3103 L 2.5␮H RSENSE 6.7m⍀ + CO VO 1.8V- 3.5V 14A 1n F SENSE- DRIVE2 IRL3103 PGND VID0- VID4 10BQ015 5-BIT CODE Figure 1. Typical Application Pentium is a registered trademark of Intel Corporation. All other trademarks are the property of their respective holders. REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other...