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iC-WD Switched-Mode Dual 5 V Regulator for 8 V to 36 V 0 pages
iC-WD A/B/C
SWITCHED-MODE DUAL VOLTAGE REGULATOR
Rev D1, Page 1/12
FEATURES
© 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/25mA output
current
© Three different output voltage combinations of 3.3V version
available (see Block Diagram)
© Small residual ripple with low capacitances in the ìF 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
© Option: enhanced temperature range of -40 to 85 °C
APPLICATIONS
© 5 V resp. 3.3V supply e.g. from
24 V industrial network
PACKAGES
SO8
(optional with
thermal pad)
DFN10
BLOCK DIAGRAM
VB (8...36 V)
ERROR
(200 mA)
RVB
1W 220mH
LVH
CVH
4.7mF
1mF
CVCCA
4.7mF
ERROR DETECTION
iC-WD VREF
VH SWITCHING CONVERTER
OSCILLATOR
TEMPERATURE
UNDERVOLTAGE
REFERENCE
VCC REGULATOR
VCCA REGULATOR
4.7mF
WDC
WDB
WDA
WD
CVCC
VCC
+5 V
+3.3 V
+3.3 V
+5 V
VCCA
+5 V
+3.3 V
+5 V
+3.3 V
1 NER
GND
4
VCCA 7
VCC 6
VH
5
VB
8
VBR
2
VHL
3
(25 mA)
Pin numbers for SO8 package
Copyright © 2007 iC-Haus http://www.ichaus.com
