Datasheet
ADP1610
Rev. A | Page 15 of 20
APPLICATION CIRCUITS
The circuit in Figure 27 shows the ADP1610 in a step-up confi-
guration that can be used to generate a 10 V regulator with the
following specifications: V
IN
= 2.5 V to 5.5 V, V
OUT
= 10 V, and
I
OUT
≤ 400 mA.
IN
SD
SS
RT
SW
ON
FB
COMP
C
SS
22nF
GND
L
4.7µH
D1
ADP1610
56
3
2
7
8 1
4
C
IN
10µF
C
COMP
150pF
R
COMP
220kΩ
C
OUT
10µF
R1
71.3kΩ
R2
10kΩ
04472-030
3
.3
V
10V
Figure 27. 3.3 V to 10 V Step-Up Regulator
The output is set to the desired voltage using Equation 1.
To change the compensation network, see Equation 17 and
Equation 18.
DC-TO-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.
IN
SD
SS
RT
SW
FB
COMP
C
SS
22nF
GND
L
4.7µH
D1
ADP1610
56
3
2
7
8 1
4
C
IN
10µF
B
Q1
A
Q1 FDC6331
C
COMP
150pF
R
COMP
220kΩ
C
OUT
10mF
R1
71.3kΩ
OFF
R2
10kΩ
R3
10kΩ
04472-031
3.3V 10V
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.
IN
SD
SS
RT
SW
ON
FB
COMP
C
SS
22nF
GND
L
4.7mH
D1
D2
D3
BAV99
BAV99
BZT52C22
BZT52C5VIS
BAV99
ADP1610
56
3
2
7
8 1
4
C1
10nF
C
IN
10µF
C
COMP
150pF
R
COMP
220kΩ
C
OUT
10µF
C2
1µF
C3
10µF
R1
71.3kW
R2
10kΩ
D5
D9
04472-033
3.3V
VGL
–5V
VGH
22V
10V
D5
D4
D8
D7
C4
10nF
R3
200Ω
C5
10nF
C6
10µF
R4
200Ω
Figure 29. TFT LCD Bias Supply