U6229B
DC/DC Converter – Power Supply 28 V
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
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 mA
5-V logic supply with I 14 mA
5-V reference voltage with I 14 mA
v
D
Logic input ENABLE
v
v
v
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
– Enables the step-up converter
Ordering Information
Extended Type Number
U6229B
Package
SO20
Remarks
Block Diagram
V
Batt
28.4 V
Supply
7V
Supply
5V
Logic
supply
5V
Reference
supply
VBL
VA1
VHL VH
VCC
VREF
GATE
Step-down
converter
PWM
Step-up
converter
Logic
supply
Reference
voltage
SOURCE
SGND
VKL15
Start-up circuit
and
over voltage
protection
GND
ENABLE
Oscillator
Internal
reference
Over / under
voltage
control
VCC / VREF
AGND
NRES
96 12284
OSC
RSET
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A1, 03-Dec-97
1 (2)
Preliminary Information
U6229B
Ozone Depleting Substances Policy Statement
It is the policy of
TEMIC TELEFUNKEN microelectronic GmbH
to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH
semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC
can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
2 (2)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 03-Dec-97
PCB Design
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