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U6229B 데이터시트 PDF




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부품번호 U6229B 기능
기능 DC/DC Converter - Power Supply 28 V
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U6229B 데이터시트, 핀배열, 회로
www.DataSheet4U.com
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 m H 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 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.
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
Extended Type Number
U6229B
Package
SO20
Remarks
Block Diagram
5V 5V
28.4 V
7V
Logic
Reference
VBatt
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
Rev. A1, 21-Apr-99
Figure 1. Block diagram with external circuit
Preliminary Information
1 (8)




U6229B pdf, 반도체, 판매, 대치품
U6229B
ENVA3, Pin 13
Pin ENVA3 serves as the control input for the step-up
converter
ENVA3 = High/ open: Normal operation
ENVA3 = Low: Step-up converter switched off
VKl15, Pin 14
VKl15 fulfills several monitoring functions with regard to
the supply voltage.
– Overvoltage detection
The external FET of the step–up converter and the switch
between VA1 and VBL are switched off in the event of
overvoltages of VBatt > 27 V typ. The other parts of the
circuit continue to function and are powered by the
capacitor connected to VA1 during this time. A Zener
diode rated at typ. 23 V is integrated in Pin VKl15 to
protect against overvoltages.
– Energy reserve state
The step-up converter is also switched off at battery volt-
ages of VBatt < 5.25 V. This leads to a reduced current
requirement from VA1. As the step-up converter and the
two linear controllers VCC and VREF are powered by VA1,
the circuit is able to power a system even in the event of
extended interruptions in the supply voltage. The dura-
tion depends on the external load and the size of CVA1.
AGND, Pin 18
Reference ground for voltages VA1, VH, VCC, VREF and
internal reference
RSET1, Pin 19
Pin 19 is connected to Pin 18 with a resistance of 35.7 kW
(tolerance 1%). In the circuit, this resistance gives rise to
a reference current from which various parameters such
as the oscillator frequency, switch-off thresholds for
step-up/step-down converter, threshold for overvoltage
detection etc. are derived.
GND, Pin 20
Common ground
Starting Behavior
The step-up converter is started only if the following
start-up conditions are fulfilled when it is switched on:
VBatt
V3
> 5.25 V typ.
> 3.4 V typ.
VBatt – V3 > 3.6 V
The step-down converter is activated only if V3 > 7 V typ.
This ensures that the step-down converter begins opera-
tion only once the step-up converter has started.
Absolute Maximum Ratings
Parameters
Supply voltage
Ambient temperature range
Junction temperature range
Storage temperature range
Symbol
VBatt
Tamb
Tj
Tstg
Min.
–40
–40
–55
Typ. Max.
44
95
150
150
Unit
V
°C
°C
°C
Thermal Resistance
Junction to case
Junction ambient
Parameters
Symbol
RthJC
RthJA
Overvoltage protection according DIN 40839/4 and ISO/TR 7637/1
ESD:
HBM 2 kV: MIL 883D M.3015.7
MM 200 V: ESD S. 5.2 – 1994
Value
30
90
Unit
k/W
k/W
4 (8) Rev. A1, 21-Apr-99
Preliminary Information

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U6229B 전자부품, 판매, 대치품
Squib
Sensor
4 Channel squib driver
U6229B
28.4 V
supply
V Batt
Power
supply
96 12290
ADC
mC
Figure 6. System block diagram
5V
reference
5V
logic
Package Information
Package SO20
Dimensions in mm
12.95
12.70
9.15
8.65
7.5
7.3
0.4
1.27
20
11.43
2.35
0.25
0.10
11
10.50
10.20
0.25
1
Rev. A1, 21-Apr-99
technical drawings
according to DIN
specifications
10
Preliminary Information
13038
7 (8)

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U6229B

DC/DC Converter - Power Supply 28 V

TEMIC Semiconductors
TEMIC Semiconductors

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