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IC / 6269CRZ / ISL6269CRZ / QFN-16

تولید کننده: Intersil
مدل کالا: ISL6269CRZ
موجودی:
تماس 8893- 6186
قیمت: 0تومان

6269CRZ - ISL6269CRZ - Intersil

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High-Performance Notebook PWM Controller with Bias Regulator and Audio-Frequency Clamp

 

General Description

The 6269CRZ - ISL6269 IC is a Single-Phase Synchronous-Buck PWM controller featuring Intersil's Robust Ripple Regulator (R3) technology that delivers truly superior dynamic response to input voltage and output load transients. Integrated MOSFET drivers, 5V LDO and bootstrap diode result in fewer components and smaller implementation area.

Intersil’s R3 technology combines the best features of fixedfrequency PWM and hysteretic PWM while eliminating many of their shortcomings. R3 technology employs an innovative modulator that synthesizes an AC ripple voltage signal VR, analogous to the output inductor ripple current. The AC signal VR enters a window comparator where the lower threshold is the error amplifier output VCOMP, and the upper threshold is a programmable voltage reference VW, resulting in generation of the PWM signal. The voltage reference VW sets the steady state PWM frequency. Both edges of the PWM can be modulated in response to input voltage transients and output load transients, much faster than conventional fixed frequency PWM controllers. Unlike a conventional hysteretic converter, the 6269CRZ - ISL6269 has an error amplifier that provides ±1% voltage regulation at the FB pin.

The 6269CRZ - ISL6269 has a 1.5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The 6269CRZ - ISL6269 can be configured to operate in continuous-conduction-mode (CCM) or diode-emulation-mode (DEM), which improves light-load efficiency. In CCM the controller always operates as a synchronous rectifier however, when DEM is enabled the low-side MOSFET is permitted to stay off, blocking negative current flow into the low-side MOSFET from the output inductor.

 

Features

High performance R3 technology

Fast transient response

+0.6V Internal Reference

±0.6% tolerance over the commercial temperature range 0°C to +70°C

±1.0% tolerance over the industrial temperature range (-40°C to +85°C)

Wide input voltage range: +7.0V to +25.0V

Output voltage range: +0.6V to +3.3V

Wide output load range: 0A to 25A

Selectable diode emulation mode for increased light load efficiency

Programmable PWM frequency: 200kHz to 600kHz

Pre-biased output start-up capability

Internal 5V LDO for self-biasing

Integrated MOSFET drivers and bootstrap diode

Internal digital soft-start

Power good monitor

PWM minimum frequency above audible spectrum

Fault protection

Undervoltage protection

Soft crowbar overvoltage protection

Low-side MOSFET rDS(ON) overcurrent protection

Over-temperature protection

Fault identification by PGOOD pull-down resistance

Pb-free RoHS compliant

 

Applications

PCI express graphical processing unit

 Auxiliary power rail

 VRM

Network adapter

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