iC-DC
preliminar y
Rev A3, Page 1/19
2-CHANNEL BUCK/BOOST DC/DC CONVERTER
FEATURES
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Wide input voltage range of +4 to +36 V
Reverse polarity protection up to -36 V with autarky function
Universal buck/boost converter with high efficiency
Two back-end, adjustable linear regulators (1.5 V to 5.5 V) with
a total of up to 300 mA of output current and a separate output
voltage monitor
Low residual ripple with small capacitors in the µF range
Separate enable inputs for the linear regulators
Two switched linear regulator outputs
Integrated switching transistors and flyback diodes
Converter cut-off current can be set by an external resistor
Integrated 3 MHz oscillator with no external components
Active noise spectrum reduction
Error messaging with overtemperature, overvoltage, and
undervoltage at the current-limited open-collector output
Wide temperature range of -40 °C to 125 °C
Protective circuitry against ESD
Space saving 24-pin QFN package
APPLICATIONS
o
Dual voltage supply by
buck/boost converters with
adjustable, back-end linear
regulators
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Power management for laser,
encoder, and automotive
applications
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PACKAGES
QFN24 4 mm x 4 mm
(RoHS compliant)
BLOCK DIAGRAM
LVBH
4...36V
CVB
1μF
VB
CVBR
10μF
VBR
22μH
VBL
VHL
VH
REVERSE
PROTECT.
INTERNAL
SUPPLY
CVH
3.3μF
VH1
VBROK
NAUT
TOK
VOLTAGE
MONITOR
AUTARKY
DETECT.
THERMAL
SHUTDOWN
ERROR DETECT.
VCC1
BUCK
1
CVH1
3.3μF
1.5...5.5V
CVCC1
1μF
POE1
SUPPLY
SWITCH 1
BOOST
1
LIN.-REG.1
CONTROL
VH2
VCC2
BIAS
CVH2
3.3μF
1.5...5.5V
CVCC2
1μF
RREF
OSCILLATOR
REFERENCE
SWITCHING REGULATOR
2
2
POE2
SUPPLY
SWITCH 2
RREF
20k
ENV1
VCC1
VCC2
LIN.-REG.2
VCC1,VCC2
V1OK
OUTPUT
ENABLE
CONFIGURATION
VCC1:
5V/3.3V/R1:R2
VCC2:
3.3V/2.5V/R3:R4
1
ENV2
V2OK
&
2
R1
R2
R3
CFG1
CFG2
iC-DC
GNDA GND
TEST
VOLTAGE
MONITORING
R4
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ICHAUS [ IC-HAUS GMBH ]
