ADP1110AN-33 AD [Analog Devices], ADP1110AN-33 Datasheet - Page 13

• Manufacturer Part Number: ADP1110AN-33
• Description: Micropower, Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
• Manufacturer: AD [Analog Devices]

APPLICATION CIRCUITS
All-Surface-Mount, Single-Cell to 5 V Converter
This is a very simple, compact, low-part-count circuit that takes
a single alkaline 1.5 V cell input and produces a 5 V output.
The output current should be kept to 10 mA or less to conserve
battery life.
All-Surface-Mount, 3 V to 5 V Step-Up Converter
Similar to the previous circuit, this circuit takes a 3-volt input
and provides a 5 V output at 40 mA. As in the single-cell version,
the circuit is compact and uses only four external components.
All-Surface-Mount, 9 V to 5 V Step-Down Converter
Featuring the same low parts count of the step-up design, this
circuit is the complement to the preceding one. The 220
resistor programs the current limit to around 600 mA.
REV. 0
Figure 30. All-Surface-Mount, Single-Cell to 5 V Converter
Figure 31. All-Surface-Mount, 3 V to 5 V Step-Up
Converter
Figure 32. All-Surface-Mount, 9 V to 5 V Step-Down
Converter
BATTERY
ALKALINE
ALKALINE
CELLS
9V
CELL
TWO
1.5V
ONE
220
R
LIM
3V
220
NC NC
AO
I
1
LIM
ADP1110-5
6
I
ADP1110-5
NC
LIM
AO
1
I
NC
6
LIM
ADP1110-5
AO
SET
1
6
7
SET
NC
SET
7
NC
V
GND
7
2
5
IN
GND
SENSE
V
GND
2
SENSE
5
V
IN
SENSE
2
5
SW1
SW2
IN
SW1
CTX50-4
3
SW2
CTX50-4
SW1
50µH
SW2
4
50µH
1N5817
4
L1
L1
4
8
3
8
3
8
D1
1N5817
1N5817
CTX50-4
D1
50µH
D1
L1
15µF
C
10µF
C
L
10µF
C
L
L
+5V
10mA
+5V
40mA
+5V
40mA
–13–
1.5 V to
This circuit works from a single 1.5 V cell and provides simulta-
neous outputs of +5 V and –5 V. The accuracy of the negative
output suffers slightly because of the extra diode drop of around
0.4 V.
All-Surface-Mount Flash Memory VPP Generator
Figure 34 shows a circuit that can generate the programming
voltage, VPP to program flash memory. The key components
are the MOSFET and the bipolar transistor. These two devices
form a switch that, when ON, allows the ADP1110 to power-up
and function as a step-up converter. The output is +12 V at 120
mA. When the MOSFET switch is OFF, the output of the
circuit drops to just under +5 V thereby disabling the program-
ming capability.
Care should be taken so there is no short-circuit-current limiting
in the circuit in either operating mode.
Figure 34. All Surface-Mount Flash Memory VPP Generator
LOGIC1 = PROGRAM
LOGIC0 = SHUTDOWN
ALKALINE
+5V
Figure 33. 1.5 V to 5 V Dual-Output Step-Up
Converter
CELL
ONE
1.5V
5 V Dual-Output Step-Up Converter
10k
MMBT4403
1k
I
NC
LIM
AO
ADP1110-5
1
6
MMBF170
SET
NC
7
V
GND
2
IN
SENSE
5
I
NC
ADP1110-12
AO
SW1
LIM
SW2
1
6
4
CTX68-4
NOTE: ALL DIODES 1N5818
SET
4.7µF
L16
8µH
NC
7
3
8
GND
V
SENSE
2
5
IN
CTX50-4
SW1
SW2
50µH
4
L1
3
8
ADP1110
1N5818
D1
4.7µF
4.7µF
10µF
C
L
+5V
3mA
–5V
3mA
V
+12V
120mA
PP