IC-DC IC-Haus, IC-DC Datasheet - Page 13

• Manufacturer Part Number: IC-DC
• Description: 2-CHANNEL BUCK/BOOST DC/DC CONVERTER
• Manufacturer: IC-Haus

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To achieve as low an interference voltage as possible,
even with small filter capacitors C
dependent linear regulator is connected after each of
the intermediate voltages VH1 und VH2.
Output voltages VCC1 and VCC2 can each be ad-
justed using a voltage divider at CFG1 and CFG2
within a range of 1.5 to 5.5 V ±5 % and according to
Equations 1 and 2.
and
NB: R
Inputs CFG1 and CFG2 can also be directly connected
to the relevant output voltage VCCx or GNDA. The re-
sulting voltages are given in Tables 4 and 5.
The regulators have been compensated internally so
that they are stable in no-load operation without an ex-
ternal capacitor. Stability across the entire load range
is guaranteed by the minimum capacitances for C
and C
outputs are current limited to protect them against de-
struction in the event of a short circuit.
The two linear regulators can be switched on and off
independently by inputs ENV1 and ENV2. If both reg-
LINEAR REGULATORS VCC1 AND VCC2
VCC1 output voltage
Potential at CFG1
GNDA
VCC1
Voltage divider
VCC2 output voltage
Potential at CFG2
GNDA
VCC2
Voltage divider
iC-DC
2-CHANNEL BUCK/BOOST DC/DC CONVERTER
1
VCC2
+ R
2
given in the electrical characteristics. The
V
V
bzw. R
VCC1
VCC2
Table 4: VCC1 settings
Table 5: VCC2 settings
= V (RREF )
= V (RREF )
3
+ R
VCC1
3.3 V
5.0 V
1.5 V to 5.5 V
VCC2
2.5 V
3.3 V
1.5 V to 5.5 V
4
= 10 k bis 50 k
VH1
(1 +
(1 +
and C
R
R
R
R
1
2
3
4
)
)
VH2
, an in-
VCC1
(1)
(2)
ulators are deactivated, iC-DC is in standby mode (see
DESCRIPTION OF FUNCTIONS/Standby).
Switched output voltages
The two pins POE1 and POE2 are triggered by monitor
outputs V1OK and V2OK and provide voltages drawn
from VCC1 or VCC2. This enables the supply of spe-
cific circuitry in a component group (e.g. EEPROMs) to
be switched on only after VCC1 or VCC2 have reached
their steady state.
Voltage monitor self-test
Using pin TEST the voltage monitoring comparators at
V1OK and V2OK can be tested during ongoing opera-
tion. The undervoltage and overvoltage thresholds of
V1OK and V2OK are checked in turn with each test.
For this purpose, pin TEST is increased to above the
threshold voltage by an external driver. Correct func-
tioning is signaled by low signals at pins V1OK and
V2OK. The function of the connected POE1 and POE2
outputs remains unaffected.
Current carrying capacity
iC-DC’s current carrying capacity depends on set out-
put voltage VCCx and input voltage VB. Figure 4
shows the current carrying capacity dependent on the
input voltage for various output voltages, measured
on the iC-DC EVAL DC1D evaluation board. The in-
ternal reverse polarity protective circuit was bridged
(VB = VBR) to increase the current carrying capacity.
Figure 4: Current carrying capacity for various out-
0,500
0,450
0,400
0,350
0,300
0,250
0,200
0,150
0,100
0,050
0,000
0,0
put voltages dependent on VB (VB = VBR)
5,0
10,0
15,0
Input Voltage VB [V]
20,0
25,0
Rev A3, Page 13/19
30,0
VH (>7.2V)
5V VCCx
3,3V VCCx
2,5V VCCx
1,5V VCCx
35,0
40,0
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