Voltage Regulators
1
Publication date: December 2001 SFF00002CEB
AN1433SSM
High accuracy, variable output, low voltage operation shunt regulator
a73 Overview
The AN1433SSM is a low voltage operation and
highly accurate positive voltage variable output type shunt
regulator IC. Since the output voltage is adjustable from
approximately 1.25 V to 15 V, it is suitable for a power
supply of small-sized 3 V-system portable equipment. Also,
it contributes to the miniaturization of set equipment by
the adoption of the small type surface mounting package.
a73 Features
• Highly accurate reference voltage:
1.25 V (allowance: ±1%)
• Low voltage operation: 1.25 V to 14 V
• Small type surface mounting package
a73 Applications
• Cellular phone, PHS, office automation equipment and
other small-sized portable equipment
SSMINI-5D
Unit: mm
a73 Block Diagram
Constant current source
Output
Reference voltage
5
Ref.
I
REF
V
REF
V
K
V
CC
R1
0.01 µF
R2
A
K
13
2 4
V
K
= V
REF
(1 +
R1
) + I
REF
× R1
R2
Error
amplifier
Output
transistor
Part No. (2 letters)Indicates No.1 pin
Marking
AQ
1.60
±0.10
1.00
±0.10
1.20±0.10
1.60±0.10
0.20
+0.10

−
0.05
1
2
0 to 0.10
4
3
5
0.50
0.50
0.20 0.20
0.12
+0.10

−
0.05
0.60 max.
Note) The package of this product will be changed
to lead-free type (SSMINI-5DA). See the new
package dimensions section later of this
datasheet.