CS5127

Features:

·Nonsynchronous Buck Design
·V2ª Control Topology
·100ns Transient Loop Response
·Programmable Oscillator Frequency
·30ns Typical Gate Rise and 10ns Fall Times (No Load)
·Frequency Synchronization Input
·ENABLE Input Controls Channel 2 Gate Driver
·5V/10mA Reference Output


Pinout




Specifications

Operating Junction Temperature, T_J.........................................................................................150
Storage Temperature Range, T_S....................................................................................-65 to 150
ESD (Human Body Model)............................................................................................................2kV
Lead Temperature Soldering: Reflow (SMD styles only).........60 sec. max above 183, 230 peak


Description

The CS5127 is a fixed frequency dual output nonsynchronous buck controller. It contains circuitry for regulating two separate outputs.

Each output channel contains a high gain error amplifier, a comparator and latch, and a totem-pole output driver capable of providing DC current of 100mA and peak current in excess of 0.5A. A common oscillator controls switching for both channels, and a sync lead is provided to allow parallel supply operation or shifting of the switching noise spectrum. An on-chip 5V reference is capable of providing as much as 10mA of current for external circuitry. The CS5127 also contains two undervoltage lockout circuits. The first lockout releases when V_IN reaches 8.4V, while the second lockout ensures that V_REF is higher than 3.6V. The outputs are held in a low state until both lockouts have released. CS5127 controller is configured to utilize the V^2TM control method to achieve the fastest possible transient response and best overall regulation. This dual controller is a cost-effective solution for providing V_CORE and V_IO power solutions in computing applications using a single controller.

The CS5127 will operate over an input voltage range of 9.4V to 20V and is available in a 16 lead wide body surface mount package.