ADP1610ARMZ-R7(Rev0) View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADP1610ARMZ-R7 Datasheet PDF : 16 Pages
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ADP1610
DC-DC STEP-UP SWITCHING CONVERTER WITH
TRUE SHUTDOWN
Some battery-powered applications require very low standby
current. The ADP1610 typically consumes 10 nA from the
input, which makes it suitable for these applications. However,
the output is connected to the input through the inductor and
the rectifying diode, allowing load current draw from the input
while shut down. The circuit in Figure 28 enables the ADP1610
to achieve output load disconnect at shutdown. To shut down
the ADP1610 and disconnect the output from the input, drive
the SD pin below 0.4 V.
3.3V Q1 A FDC6331
R3
10kΩ
Q1 B
CIN
10µF
OFF
CSS
22nF
4.7µH
L
ADP1610
6 IN
SW 5
3 SD
7 RT
FB 2
8 SS
COMP 1
GND
4
D1
R1
71.3kΩ
R2
10kΩ
RCOMP
220kΩ
CCOMP
150pF
10V
COUT
10µF
Figure 28. Step-Up Regulator with True Shutdown
TFT LCD BIAS SUPPLY
Figure 29 shows a power supply circuit for TFT LCD module
applications. This circuit has +10 V, −5 V, and +22 V outputs.
The +10 V is generated in the step-up configuration. The −5 V
and +22 V are generated by the charge-pump circuit. During the
step-up operation, the SW node switches between 10 V and
ground (neglecting forward drop of the diode and on resistance
of the switch). When the SW node is high, C5 charges up to
10 V. C5 holds its charge and forward-biases D8 to charge C6
to −10 V. The Zener diode, D9, clamps and regulates the output
to −5 V.
The VGH output is generated in a similar manner by the
charge-pump capacitors, C1, C2, and C4. The output
voltage is tripled and regulated down to 22 V by the
Zener diode, D5.
3.3V
CIN
10µF
VGL
–5V
D9
BZT52C5VIS
R4
200Ω
C6
10µF
BAV99 C5
10nF
D8
D7
C4
10nF
D5 C3
10µF
D4
BAV99
D3
R3
200Ω
VGH
22V
D5
BZT52C22
4.7µH
L
C2
1µF
C1
10nF D2
BAV99
ADP1610
D1
10V
6 IN
SW 5
ON
3 SD
7 RT
CSS
22nF
8 SS
FB 2
COMP 1
GND
4
R1
71.3kΩ
R2
10kΩ
RCOMP
220kΩ
CCOMP
150pF
COUT
10µF
Figure 29. TFT LCD Bias Supply
SEPIC POWER SUPPLY
The circuit in Figure 30 shows the ADP1610 in a single-ended
primary inductance converter (SEPIC) topology. This topology
is useful for an unregulated input voltage, such as a battery-
powered application in which the input voltage can vary
between 2.7 V to 5 V, and the regulated output voltage falls
within the input voltage range.
The input and the output are dc-isolated by a coupling capaci-
tor, C1. In steady state, the average voltage of C1 is the input
voltage. When the ADP1610 switch turns on and the diode
turns off, the input voltage provides energy to L1, and C1
provides energy to L2. When the ADP1610 switch turns off and
the diode turns on, the energy in L1 and L2 is released to charge
the output capacitor, COUT, and the coupling capacitor, C1, and
to supply current to the load.
2.5V–5.5V
CIN
10µF
4.7µH
L1
ADP1610
6 IN
SW 5
ON
3 SD
CSS
22nF
7 RT
8 SS
FB 2
COMP 1
GND
4
C1
10µF
4.7µH
L2
R1
16.8kΩ
RCOMP
60kΩ
CCOMP
1nF
R2
10kΩ
3.3V
COUT
10µF
Figure 30. 3.3 V DC-DC Converter
Rev. 0 | Page 14 of 16
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