MIC7400: Five-Channel Buck Regulator Plus One-Boost with HyperLight Load® and I2C Control

The MIC7400 is a powerful, highly-integrated, configurable, power-management IC (PMIC) featuring five synchronous buck regulators, one boost regulator, and high-speed I2C interface with an internal EEPROM.

The device offers two distinct modes of operation “stand-by mode” and “normal mode” intended to provide an energy optimized solution suitable for portable handheld and infotainment applications.

In normal mode, the programmable switching converters can be configured to support a variety of start-up sequencing, timing, soft-start ramp, output voltage levels, current limit levels, and output discharge for each channel.

In stand-by mode, the PMIC can be configured in a low power state by either disabling an output or by changing the output voltage to a lower level. Independent exit from stand-by mode can be achieved either by I2C communication or the external STBY pin.

The device has five synchronous buck regulators with high-speed adaptive on-time control, supporting even the challenging ultra-fast transient requirement for Core supplies. One boost regulator provides a flash-memory programming supply that delivers up to 200mA of output current. The boost is equipped with an output disconnect switch that opens if a short-to-ground fault is detected.

An internal EEPROM enables a single-chip solution across many platforms by allowing the designer to customize the PMIC for their design. Modifications can be made without the need to re-approve a new PMIC, saving valuable design resources and time.

All switchers provide light-load efficiency with HyperLight Load® mode for buck, and PFM mode for boost. An additional benefit of this proprietary architecture is very-low output ripple voltage throughout the entire load range with the use of small output capacitors. The MIC7400 supplies are designed for use with a small inductor (down to 0.47μH for buck, 1.5μH for boost), and an output capacitor as small as 10μF for buck, enabling a total solution size of 15mm × 15mm and less than 1mm height.

Key Features
  • Input voltage: 2.4V to 5.5V
  • Five independent synchronous bucks up to 3A
  • One independent non-synchronous boost 200mA
  • 200μA quiescent current (all regulators on)
  • 93% peak buck efficiency, 85% typical efficiency at 1mA
  • Dual power mode: stand-by and normal mode
  • I2C interface up to 3.4MHz
  • I2C on-the-fly EEPROM programmability, featuring:
    • Buck and boost output voltage scaling
    • Power-on-reset threshold and delay
    • Power-up sequencing/sequencing delay
    • Buck and boost current limit
    • Buck and boost pull-down when disabled
    • Individual ON, OFF, and standby modes
    • Soft-start and global power-good masking
    • 23μA buck typical quiescent current
    • 70μA boost typical quiescent current
    • 1.5% output accuracy over temperature/line/load
    • 2.0MHz boost switching frequency
    • 1.3MHz buck operation in continuous mode
    • Ultra-fast buck transient response
    • 15mm × 15mm × 1.25mm solution size
    • Thermal-shutdown and current-limit protection
    • 36-pin 4.5mm × 4.5mm × 0.85mm FQFN package (0.4mm pitch)
    • −40°C to +125°C junction temperature range

 

Ordering Information
Part Number Marking Output Voltages Features Package(1) Lead Finish
MIC7400YFL 7400 1.8V, 1.1V, 1.8V
1.05V, 1.25V, 12V		 STBY - Active Low
Falling Edge (default)		 36-Pin 4.5mm x 4.5mm FQFN Pb-Free
MIC7400-XXXXYFL(2) X 7400
X
X
X		 Configurable Configurable 36-Pin 4.5mm x 4.5mm FQFN Pb-Free

Datasheet

 
Fonte - Micrel
 
17 de marco de 2015