U6229B Datasheet | TEMIC Semiconductors

.. DC/DC Converter - Power Supply 28 V Description The U6229B is a multifunctional power supply IC which provides four different voltages dedicated to supply ponents of plex microcontroller systems. Supplied by a battery voltage in the wide range from 6 V to 26 V, the U6229B generates typically 28.4 V with a step-up converter, PWM, external power MOSFET and 150 m H inductivity. This voltage is fed to a step-down converter with external 150 m H inductivity to generate a 7-V auxiliary voltage with a small ripple. By means of this voltage, two linear regulators with only a small power dissipation provide a constant 5-V (±3%) supply for microcontrollers and an even more accurate 5-V (±2%) supply as a reference for sensors and a/d converters. Features D Voltage outputs - 28.4-V step-up converter with I 1.2 A - 7-V step-down converter with I 400 m A - 5-V logic supply with I 14 m A - 5-V reference voltage with I 14 m A v v v v D Analog input VKL15 - Energy-reserve mode switches off the step-up converter at VBatt < 5.25 V - Controls start-up behavior D Logic output NRES - N-reset output with over/ under voltage monitoring of both 5-V supplies D Logic input ENABLE - Enables the step-up converter Ordering Information Extended Type Number U6229B Package SO20 Remarks Block Diagram VBatt 28.4 V Supply 7V Supply 5V Logic supply 5V Reference supply VA1 VHL VH VREF GATE Step-down converter PWM Step-up converter Logic supply Reference voltage SOURCE SGND VKL15 Start-up circuit and over voltage...