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PDF U6229B Data sheet ( Hoja de datos )
| Número de pieza | U6229B | |
| Descripción | DC/DC Converter - Power Supply 28 V | |
| Fabricantes | TEMIC Semiconductors | |
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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)
1 page  
U6229B
Electrical Characteristics
VBatt = 6 V to 26 V, Tamb = –40 to 95°C unless otherwise specified. Values measured at application example circuit
figure 5.
Parameters
Test Conditions / Pins
Oscillator
Frequency constant
Oscillator frequency
Step-up converter
COS1 = 1 nF
Output voltage
VCVB = 14 V Pin 3
I3 = 120 mA
Output voltage
VCVB > 5 V
I3 = 30 mA
Pin 3
Coefficient of efficiency VCVB = 5 V
V3 = 27.5 V
Coefficient of efficiency VCVB = 11 V
V3 = 27.5 V
Switch-off current
LVB
Pin 2
Voltage drop
Voltage at pin GATE
VBL – VA1; I2 = 0.9 I2max
Output high Pin 7
Voltage at pin GATE
Output low
I7 = 100 m A
Pin 7
Voltage at pin GATE
Output low
I7 = 5 mA
Pin 7
Step-up converter – starting behavior
Power-on-reset
Precharge CVA1
VBatt > 6 V
Step-up converter – Enable/Disable
Supply voltage
Threshold voltage
V9 = 7 V
Input voltage
Pin 13 open
Inpu current
V13 = 0 V
Step-down converter
Output voltage
I10 = –20 mA Pin 9
Coefficient of efficiency
Switch-off current
Voltage drop
Forward voltage of free-
wheeling diode
LVH Pin 8
VA1 – VHL; I8 = 0.9 I8max
IV8 = 0.9 I8max
Step-down converter – starting behavior
Switch threshold
VCC – regulator
Output voltage
VBatt > 6 V
IV10 = 0 mA to –90 mA
Switch-off threshold
Undervoltage
Overvoltage
Switch-on threshold
Undervoltage
Overvoltage
Symbol
KOSC
fOSC
VVA1
VVA1
h
h
I2
V2 – V3
V7
V7
V7
Min. Typ. Max. Unit
81 Hzm F
73 89 kHz
27.5 28.4 29.3
27.5 28.4 29.3
65
82
1.2 1.6
1.0 3.5
4.5 18
1
1.6
V
V
%
%
A
V
V
V
V
V3
VBatt – V3
VBatt
V13
V13
I13
VH
h
I8
V3 – V8
V8
2.6 3.4 4.2
2.1 5.5
5.5 5.25 5.5
0.8 2.0
4.4 7.0
– 1.9
– 0.4
6.5 7.5
70
– 0.4 – 0.65
1.3
– 1.2
V
V
V
V
V
V
V
%
A
V
V
V3
V10
dV10off
dV10off
dV10on
dV10on
6.3
4.85
50
50
7.6 V
5.15 V
230 mV
230 mV
mV
mV
Rev. A1, 21-Apr-99
Preliminary Information
5 (8)
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet U6229B.PDF ] | |
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