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Voltage Regulators
1
Publication date: December 2001
SFF00002CEB
AN1433SSM
High accuracy, variable output, low voltage operation shunt regulator
I 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.
I Features
Highly accurate reference voltage:
1.25 V (allowance:
1%)
Low voltage operation: 1.25 V to 14 V
Small type surface mounting package
I Applications
Cellular phone, PHS, office automation equipment and
other small-sized portable equipment
SSMINI-5D
Unit: mm
I Block Diagram
Constant current source
Output
Reference voltage
5
Ref.
I
REF
V
REF
V
K
V
CC
R1
0.01
F
R2
A
K
1
3
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
A Q
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.
AN1433SSM
2
SFF00002CEB
I Pin Descriptions
I Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Cathode voltage
V
K
14.2
V
Reference voltage
V
REF
7
V
Supply current
I
K
1.5
mA
Reference current
I
REF
50
A
Cathode-anode reverse current
-I
KA
-10
mA
Cathode-reference reverse current
-I
KR
-10
mA
Cathode current
I
K
20
mA
Power dissipation
*2
P
D
50
mW
Operating ambient temperature
*1
T
opr
-30 to +85
C
Storage temperature
*1
T
stg
-55 to +150
C
I Recommended Operating Range
Parameter
Symbol
Range
Unit
Supply voltage
V
CC
V
REF
to 14
V
Pin No.
Description
1
V
CC
Power source current supply pin.
2
Anode
The reference voltage pin for the constant voltage of this shunt regulator IC. The current
from V
CC
, cathode and reference flow out from this pin.
3
K: Cathode
The constant voltage output pin of this shunt regulator. The supplied current more than
necessary to this pin is bypassed to anode pin by the output transistor.
4
N.C.
Nothing is connected to this pin. If high voltage is applied, the characteristics of the IC
may be affected.
5
Reference
The reference voltage (1.25 V typical) pin. Although the impedance is high under the no-
rmal using conditions, be careful that the impedance drops and current flows into the IC
inside if a current or voltage is forced to apply from the outside.
Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned.
For circuit currents, '
+' denotes current flowing into the IC and '-' denotes current flowing out of the IC.
2. *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for T
a
= 25C.
*2: The value at T
a
= 85C.
AN1433SSM
3
SFF00002CEB
I Electrical Characteristics at V
CC
= 1.8 V, T
a
= 25C
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Reference voltage
V
REF
I
K
= 10 mA
1.2375 1.25 1.2625
V
Reference voltage
V
REF
1.7 V
V
CC
14.0 V,
- 0.73 -1.5 mV/V
supply voltage fluctuation
V
CC
I
K
= 10 mA
Reference voltage
V
REF
0.2 mA
I
K
20 mA
0.04
0.3
mV/mA
cathode current fluctuation
I
K
Reference input current
I
REF
R
1
= 10 k, I
K
= 10 mA
4.0
10
A
Minimum cathode current
I
K min
V
K
= V
REF
0.2
mA
Off time total current
I
OFF
V
K
= 14.0 V, V
REF
= 0 V
1
A
Cathode saturation voltage
V
Ksat
I
K
= 10 mA, V
REF
= 1.3 V
0.08
0.15
V
Supply current
ICC
I
K
= 10 mA
0.75
1.50
mA
Parameter
Symbol
Conditions
Reference value
Unit
Reference voltage change
V
REF
/
V
KA
= V
REF
, I
KA
= 10 mA
3
mV
with temperature
T
a
0
C T
a
+70C
Reference input current change
I
REF
/
R
1
= 10 k, I
K
= 10 mA
1.1
mA
with temperature
T
a
0
C T
a
+70C
Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Power dissipation
P
D
(W)
0
25
Ambient temperature T
a
(C)
50
75
100
125
0
0.000
0.050
0.100
0.120
0.150
0.200
Independent IC
without heat sink
R
th(j-a)
= 833.3C/W
I Application Notes
1. P
D
T
a
curves of SSMINI-5D package
P
D
T
a
AN1433SSM
4
SFF00002CEB
I Application Notes (continued)
2. Main Characteristics
Reference voltage (temperature characteristics)
Reference current (temperature characteristics)
Supply current
Reference input current
Reference voltage supply voltage fluctuation
Reference voltage cathode current fluctuation
V
K
= V
REF
V
CC
= 14 V
V
CC
= 1.8 V
V
CC
= 5 V
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
0
2
4
6
8
10
12
14
16
18
20
I
K
(mA)
I
CC
(mA)
1.00
V
CC
= 1.8 V
R
1
= 10 k
0
0
2
4
6
8
10
12
14
16
18
20
I
K
(mA)
I
REF
(
A)
10
9
8
7
6
5
4
3
2
1
V
CC
= 1.8 V
V
K
= V
REF
-10.0
-6.0
-8.0
-4.0
-2.0
0
2
8
6
10
12
14
16
18
4
20
I
K
(mA)
V
REF
(mV)
6.0
4.0
2.0
0
50
C
95
C
75
C
T
a
= 0C
25
C
-25C
V
CC
= 1.8 V
V
K
= V
REF
0
0
2
4
8
10
12
14
16
18
6
20
I
K
(mA)
I
REF
(
A)
10
9
8
7
6
5
4
3
2
1
T
a
= -25C
0
C
95
C
75
C
25
C
50
C
V
K
= V
REF
I
K
= 10 mA
-14
-16
-12
-10
-8
-6
-4
-2
2
0
4
1.5 2
4
6
8
10
12
14
V
CC
(V)
V
REF
(mV)
6
V
CC
= 1.8 V
V
K
= V
REF
-5
-4
-3
-2
-1
0
1
2
3
4
0
2
4
6
8
10
12
14
16
18
20
I
K
(mA)
V
REF
(mV)
5
AN1433SSM
5
SFF00002CEB
Minimum cathode current
V
REF
temperature characteristic
Cathode saturation voltage
1.24
-50
150
100
50
0
Temp. (
C)
V
REF
(V)
1.26
1.258
1.254
1.256
1.252
1.25
1.248
1.246
1.244
1.242
V
CC
= 1.8 V
V
REF
= 1.3 V
0
0
2
4
6
10
12
14
16
18
8
20
I
K
(mA)
V
Ksat
(mV)
200
180
160
140
120
100
80
60
40
20
V
CC
= 1.8 V
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
I
K
(
A)
V
REF
(mV)
0
I Application Notes (continued)
2. Main Characteristics (continued)
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