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)

ERROR

(200 mA)

RVB

1

Ω

220

µH

LVH

CVH

4.7

µF

1

µF

CVCCA

4.7

µF

ERROR DETECTION

iC−WD

VREF

VH SWITCHING CONVERTER

OSCILLATOR

TEMPERATURE

UNDERVOLTAGE

REFERENCE

VCC REGULATOR

VCCA REGULATOR

4.7

µF

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

NER

1

GND

4

VCCA

7

VCC

6

VH

5

VB

8

VBR

2

VHL

3

(25 mA)

Pin numbers for SO8 package

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