General Description

The CX8507 is a single‐phase, constant‐on‐time, synchronous PWM controller, which drives N‐channel MOSFETs. The CX8507 steps down high voltage to generate low‐voltage chipset or RAM supplies in notebook computers. The CX8507 provides excellent transient response andaccurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the provides very high efficiency over light to heavy loads with loading‐modulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low‐noise requirements.

Features

zAdjustable Output Voltage from +0.7V to +5.5V

z0.7V Reference Voltage

z±1% Accuracy Over‐Temperature

zOperates from an Input Battery Voltage Range of +1.8V to +32V

zPower‐On‐Reset Monitoring on VCC Pin

zExcellent Line and Load Transient Responses

zPFM Mode for Increased Light Load Efficiency

zSelectable PWM Frequency from 4 Preset Values

zIntegrated MOSFET Drivers

zTDFN‐10 3x3 Package

Applications

zNotebook

zTable PC

zHand‐Held Portable

zAIO PC

zLCD Monitor / TV

zBattery Charger

zADSL Modem

zTelecom / Networking Equipment

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