U6229B Datasheet, PDF (1/8 Pages) TEMIC Semiconductors – DC/DC Converter - Power Supply 28 V

DC/DC Converter – Power Supply 28 V
U6229B
Description
The U6229B is a multifunctional power supply IC which
provides four different voltages dedicated to supply
components of complex 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 mH inductivity. This voltage is fed to a step-down
Features
D Voltage outputs
v – 28.4-V step-up converter with I 1.2 A
v – 7-V step-down converter with I 400 mA
v – 5-V logic supply with I 14 mA
v – 5-V reference voltage with I 14 mA
D Logic input ENABLE
– Enables the step-up converter
Ordering Information
converter with external 150 mH 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.
D Analog input VKL15
– Energy-reserve mode switches off the step-up
converter at V_Batt < 5.25 V
– Controls start-up behavior
D Logic output NRES
– N-reset output with over/ under voltage
monitoring of both 5-V supplies
Extended Type Number
U6229B
Package
SO20
Remarks
Block Diagram
5V
5V
28.4 V
7V
Logic
Reference
V_Batt
Supply
Supply
supply
supply
VBL
VA1
VHL VH
VCC
VREF
GATE
PWM Step-up
SOURCE
converter
SGND
Step-down
converter
Logic
supply
Reference
voltage
VKL15
Start-up circuit
and
over voltage
protection
GND
ENABLE
Oscillator
OSC
Internal
reference
Over / under
voltage
control
VCC / VREF
RSET
AGND
NRES
96 12284
Figure 1. Block diagram with external circuit
Rev. A1, 21-Apr-99
1 (8)
Preliminary Information