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PDF IC-DC Data sheet ( Hoja de datos )
| Número de pieza | IC-DC | |
| Descripción | 2-CHANNEL BUCK/BOOST DC/DC CONVERTER | |
| Fabricantes | IC-Haus | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IC-DC (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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www.DataSheet.co.kr
iC-DC
preliminary
2-CHANNEL BUCK/BOOST DC/DC CONVERTER
FEATURES
o Wide input voltage range of +4 to +36 V
o Reverse polarity protection up to -36 V with autarky function
o Universal buck/boost converter with high efficiency
o 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
o Low residual ripple with small capacitors in the µF range
o Separate enable inputs for the linear regulators
o Two switched linear regulator outputs
o Integrated switching transistors and flyback diodes
o Converter cut-off current can be set by an external resistor
o Integrated 3 MHz oscillator with no external components
o Active noise spectrum reduction
o Error messaging with overtemperature, overvoltage, and
undervoltage at the current-limited open-collector output
o Wide temperature range of -40 °C to 125 °C
o Protective circuitry against ESD
o Space saving 24-pin QFN package
Rev A3, Page 1/19
APPLICATIONS
o Dual voltage supply by
buck/boost converters with
adjustable, back-end linear
regulators
o Power management for laser,
encoder, and automotive
applications
PACKAGES
QFN24 4 mm x 4 mm
(RoHS compliant)
BLOCK DIAGRAM
4...36V CVB
1μF
CVBR
10μF
VB
VBR
LVBH
22μH
VBL VHL
REVERSE
PROTECT.
INTERNAL
SUPPLY
VBROK
NAUT
TOK
VOLTAGE
MONITOR
AUTARKY
DETECT.
THERMAL
SHUTDOW N
ERROR DETECT.
RREF
20k
RREF
BIAS
OSCILLATOR
REFERENCE
VCC1
VCC2
ENV1
ENV2
R1 R3
R2
R4
CFG1
CFG2
OUTPUT
ENABLE
CONFIGURATION
VCC1:
5V/3.3V/R1:R2
VCC2:
3.3V/2.5V/R3:R4
BUCK
BOOST
CONTROL
SWITCHING REGULATOR
iC-DC
GNDA GND
VH
VH1
1
LIN.-REG.1
VCC1
1 POE1
SUPPLY
SWITCH 1
VH2
VCC2
2
LIN.-REG.2
VCC1,VCC2
2
TEST
&
VOLTAGE
MONITORING
SUPPLY
SWITCH 2
POE2
V1OK
1
V2OK
2
CVH
3.3μF
CVH1
3.3μF
1.5...5.5V
CVCC1
1μF
CVH2
3.3μF
1.5...5.5V
CVCC2
1μF
Copyright © 2011 iC-Haus
http://www.ichaus.com
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
iC-DC
preliminary
2-CHANNEL BUCK/BOOST DC/DC CONVERTER
PACKAGE DIMENSIONS
Rev A3, Page 5/19
RECOMMENDED PCB-FOOTPRINT
3.80
2.49 R0.15
SIDE
0.50 0.30
TOP BOTTOM
4 2.45
0.50
0.25
dra_qfn24-1_pack_1, 10:1
All dimensions given in mm.
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
iC-DC
preliminary
2-CHANNEL BUCK/BOOST DC/DC CONVERTER
DESCRIPTION OF FUNCTIONS
Rev A3, Page 11/19
DC/DC converter iC-DC generates two regulated volt-
ages of VH1 and VH2 from voltage VBR. These presta-
bilize the two linear regulators VCC1 and VCC2. A
third voltage of VH, also regulated, is generated to
drive these linear regulators. Voltage supply VB may
be either above or below the output voltages. Figure 1
shoes the basic function principle of iC-DC. Switches
S1 to S6 and diode D1 have been implemented on the
chip. The inductor, capacitors, and load resistors are
external devices.
S4 VH
VB D1 VBR S1 VBL LVBH VHL
S3 S2
S5 VH1
S6 VH2
CVH
RVH
CVH1
RVH1
CVH2
RVH2
Another feature of iC-DC is that bias voltages VH1 and
VH2 adjust themselves automatically to approximately
400 mV using the selected VCC1 or VCC2 voltage.
This results in minimum power dissipation as only a
low amount of voltage is lost through each of the linear
regulators.
Charge/discharge phase
During the charge phase switches S1 and S2 close
with the internal clock. A linearly increasing current
flows through coil LVBH. The energy from supply VBR
is stored in the coil’s magnetic field.
Switches S1 and S2 open for discharging. Switch S3
and one of the switches S4/S5/S6 are closed. The cur-
rent can continue to flow in the coil and is supplied to
the relevant capacitor and relevant load. Figure 2 de-
scribes the resulting course of the current and voltage.
The current rise and fall times depend on the inductor
voltage.
Figure 1: Principle of operation of the converter
Dual 3.3V/5V BOOST/BUCK SMPS, 05.05.2008 11:51:33
400mA
300mA
200mA
100mA
0
I(LVBH)
4V
3V
2V
1V
0
-1V
V(VBL)
8V
6V
4V
2V
0
V(VHL)
8.887ms
8.888ms
Time (linear) [Plot 0]
8.889ms
Figure 2: Converter current/voltage characteristics (VB = 4 V)
8.89ms
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet IC-DC.PDF ] | |
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