iC-WD
A/B/C
SWITCHED-MODE DUAL VOLTAGE REGULATOR
Rev D1, Page 1/12
FEATURES
o
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o
o
o
o
o
o
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o
Input voltage 8 to 36 Vdc
Highly efficient down converter
Switching transistor and free-wheeling diode integrated
Adjustment of the regulator cut-off current with external
resistor
Integrated 100 kHz oscillator without external components
Switching frequency above the audible range
Two downstream linear regulators with 200 mA/25 mA output
current
Three different output voltage combinations of 3.3 V version
available (see Block Diagram)
Small residual ripple with low capacitances in the µF range
Fault message at overtemperature and undervoltage at
current-limited open-collector output
Shutdown of switching regulator at overtemperature
Internal reference voltages
ESD protection
Low space requirement with SO8 resp. tiny DFN10 package
APPLICATIONS
o
5 V resp. 3.3 V supply e.g. from
24 V industrial network
PACKAGES
o
Option:
enhanced temperature range of -40 to 85 °C
SO8
(optional with
thermal pad)
DFN10
BLOCK DIAGRAM
VB (8...36 V)
RVB
1Ω
4.7µF
8
VB
2
VBR
VHL
3
LVH
220µH
CVH
4.7µF
5
VH
VH SWITCHING CONVERTER
WD
WDA
WDB
WDC
OSCILLATOR
VCC
6
(200 mA)
VCC
+5 V
+3.3 V
+3.3 V
+5 V
VCCA
+5 V
+3.3 V
+5 V
+3.3 V
ERROR
1
NER
CVCC
4.7µF
TEMPERATURE
VCC REGULATOR
UNDERVOLTAGE
ERROR DETECTION
VCCA
7
(25 mA)
iC−WD
GND
4
REFERENCE
VREF
VCCA REGULATOR
CVCCA
1µF
Pin numbers for SO8 package
Copyright © 2007 iC-Haus
ICHAUS [ IC-HAUS GMBH ]
