IC-WD Datasheet, PDF (1/12 Pages) IC-Haus GmbH – SWITCHED-MODE DUAL VOLTAGE REGULATOR

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