Voltage Regulators
AN1433SSM
High accuracy, variable output, low voltage operation shunt regulator
■ Overview
Unit: mm
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.
1.60±0.10
0.20
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■ Applications
0.20+0.10
−0.05
0.50 0.50
1.60±0.10
1.00±0.10
1
2
3
4
0.60 max.
0 to 0.10
0.12+0.10
−0.05
• Highly accurate reference voltage:
1.25 V (allowance: ±1%)
• Low voltage operation: 1.25 V to 14 V
• Small type surface mounting package
5
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■ Features
0.20
1.20±0.10
SSMINI-5D
• Cellular phone, PHS, office automation equipment and
other small-sized portable equipment
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.
Marking
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A Q
0.01 µF
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■ Block Diagram
VK
Part No. (2 letters)
VCC
K
1
R1
IREF
Indicates No.1 pin
Output
3
Constant current source
5
Ref.
Error
amplifier
Output
transistor
Reference voltage
R2
VREF
2
A
4
VK = VREF (1 + R1) + IREF × R1
R2
Publication date: December 2001
SFF00002CEB
1
AN1433SSM
■ Pin Descriptions
Pin No.
Description
VCC
Power source current supply pin.
2
Anode
The reference voltage pin for the constant voltage of this shunt regulator IC. The current
from VCC, 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.
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1
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 normal 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.
■ Absolute Maximum Ratings
Symbol
Rating
Unit
VK
14.2
V
VREF
7
V
IK
1.5
mA
IREF
50
µA
Cathode-anode reverse current
−IKA
−10
mA
Cathode-reference reverse current
−IKR
−10
mA
IK
20
mA
PD
50
mW
−30 to +85
°C
−55 to +150
°C
Cathode voltage
Reference voltage
Supply current
Reference current
Cathode current
Power dissipation
*2
Storage temperature
*1
Topr
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Operating ambient temperature
*1
ue
Parameter
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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 Ta = 25°C.
*2: The value at Ta = 85°C.
■ Recommended Operating Range
Parameter
Supply voltage
2
Symbol
Range
Unit
VCC
VREF to 14
V
SFF00002CEB
AN1433SSM
■ Electrical Characteristics at VCC = 1.8 V, Ta = 25°C
Parameter
Symbol
Conditions
Min
Reference voltage
VREF
IK = 10 mA
Reference voltage
supply voltage fluctuation
∆VREF
∆VCC
1.7 V ≤ VCC ≤ 14.0 V,
IK = 10 mA

Reference voltage
cathode current fluctuation
∆VREF
∆IK
0.2 mA ≤ IK ≤ 20 mA

Typ
Max
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1.2375 1.25 1.2625
− 0.73 −1.5
Unit
V
mV/V
0.04
0.3
mV/mA
IREF
R1 = 10 kΩ, IK = 10 mA

4.0
10
µA
Minimum cathode current
IK min
VK = VREF


0.2
mA
Off time total current
IOFF
VK = 14.0 V, VREF = 0 V


1
µA
Cathode saturation voltage
VKsat
IK = 10 mA, VREF = 1.3 V

0.08
0.15
V
Supply current
ICC
IK = 10 mA

0.75
1.50
mA
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Reference input current
• Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Reference voltage change
with temperature
∆VREF /
∆Ta
VKA = VREF , IKA = 10 mA
0°C ≤ Ta ≤ +70°C
Reference input current change
with temperature
∆IREF /
∆Ta
R1 = 10 kΩ, IK = 10 mA
0°C ≤ Ta ≤ +70°C
■ Application Notes
Reference value
Unit
3
mV
1.1
mA
1. PD  Ta curves of SSMINI-5D package
PD  T a
Power dissipation PD (W)
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0.200
0.150
0.120
0.100
0.050
Independent IC
without heat sink
Rth(j-a) = 833.3°C/W
0.000
0
0
25
50
75
100
125
Ambient temperature Ta (°C)
SFF00002CEB
3
AN1433SSM
■ Application Notes (continued)
2. Main Characteristics
Supply current
Reference input current
VK = VREF
1.00
VCC = 1.8 V
R1 = 10 kΩ
10
9
0.95
8
0.90
VCC = 14 V
7
IREF (µA)
VCC = 5 V
0.80
VCC = 1.8 V
0.75
5
0.70
4
0.65
3
2
0.60
1
0.55
0
0.50
0
2
4
6
8
10
12
14
16
18
0
20
Reference voltage (temperature characteristics)
6.0
2
4
6
8
10
12
14
16
18
20
IK (mA)
IK (mA)
VCC = 1.8 V
VK = VREF
Reference current (temperature characteristics)
VCC = 1.8 V
VK = VREF
10
4.0
9
Ta = 0°C
25°C
2.0
8
7 Ta = −25°C
0
−25°C
IREF (µA)
∆VREF (mV)
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ICC (mA)
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0.85
−2.0
−4.0
6
0°C
25°C
5
4
50°C
−6.0
95°C
95°C
3
75°C
75°C
50°C
2
0
2
4
6
8
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−10.0
ue
−8.0
10
12
14
16
IK (mA)
18
1
0
20
0
en
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2
int
12
14
16
18
20
VCC = 1.8 V
VK = VREF
3
−2
∆VREF (mV)
∆VREF (mV)
10
5
−4
−6
−8
2
1
0
−1
−10
−2
−12
−3
−14
−4
4
6
8
10
12
−5
14
VCC (V)
4
8
4
0
−16
1.5 2
6
Reference voltage cathode current fluctuation
VK = VREF
IK = 10 mA
Ma
4
4
IK (mA)
Reference voltage supply voltage fluctuation
6
2
0
2
4
6
8
10
12
IK (mA)
SFF00002CEB
14
16
18
20
AN1433SSM
■ Application Notes (continued)
2. Main Characteristics (continued)
VREF temperature characteristic
Cathode saturation voltage
1.26
1.258
200
1.256
180
VCC = 1.8 V
VREF = 1.3 V
160
1.254
140
VREF (V)
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VKsat (mV)
1.252
1.25
1.248
1.246
120
100
80
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60
1.244
40
1.242
20
1.24
−50
0
0
50
100
150
Temp. (°C)
0
2
4
6
8
10
12
14
16
18
20
IK (mA)
Minimum cathode current
VCC = 1.8 V
0
−10
−30
−40
−50
−60
−70
ue
−80
4.6
4.7
4.8
4.9
5.0
5.1
en
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IK (µA)
int
−100
4.5
ce
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−90
Ma
∆VREF (mV)
−20
5.2
5.3
5.4
5.5
SFF00002CEB
5
AN1433SSM
■ Application Circuit Example
This circuit amplifies the error voltage of the secondary side output voltage in the insulation type switching power
supply, then transfers it to the primary side via a photocoupler.
Replaceable with the conventional products (AN1431M, AN1431T, AN1432MS).
(Secondary side)
(Primary side)
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EO (+)
VREF
AN1433SSM
VCC
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0.01 µF
EO (−)
Primary side
to control IC
Note) As VCC and cathode pin are separated, VK can operate till 0.15 Vmax (at IK = 10 mA) at least.
■ New Package Dimensions (Unit: mm)
• SSMINI-5DA (Lead-free package)
0.20
0.20+0.10
-0.05
4
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ce 0.20
/D
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1.60±0.10
1.20±0.10
5
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Ma
0.60 max.
0 to 0.10
2
3
0.50 0.50
1.00±0.10
1.60±0.10
+0.10
-0.05
en
an
1
0.10
1
2
5
6
0.10 M
Seating plane
3
4
SFF00002CEB
Request for your special attention and precautions in using the technical information and
semiconductors described in this book
(1) If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and
regulations of the exporting country, especially, those with regard to security export control, must be observed.
(2) The technical information described in this book is intended only to show the main characteristics and application circuit examples
of the products, and no license is granted under any intellectual property right or other right owned by our company or any other
company. Therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any other
company which may arise as a result of the use of technical information described in this book.
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(3) The products described in this book are intended to be used for standard applications or general electronic equipment (such as office
equipment, communications equipment, measuring instruments and household appliances).
Consult our sales staff in advance for information on the following applications:
– Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support
systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body.
– Any applications other than the standard applications intended.
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(4) The products and product specifications described in this book are subject to change without notice for modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product
Standards in advance to make sure that the latest specifications satisfy your requirements.
(5) When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions
(operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute
maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any
defect which may arise later in your equipment.
Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure
mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire
or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products.
(6) Comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (ESD, EOS,
thermal stress and mechanical stress) at the time of handling, mounting or at customer's process. When using products for which
damp-proof packing is required, satisfy the conditions, such as shelf life and the elapsed time since first opening the packages.
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(7) This book may be not reprinted or reproduced whether wholly or partially, without the prior written permission of Matsushita
Electric Industrial Co., Ltd.