PANASONIC AN1432MS

Voltage Regulators
AN1432MS
Variable output, low voltage operation shunt regulator IC
The AN1432MS is a low voltage operation and positive voltage variable output type shunt regulator IC. Since
the output voltage is adjustable from approximately 1.26
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.
0.40
1.45
Unit: mm
0.65 ± 0.15
■ Overview
+ 0.10
– 0.05
0.16 +– 0.10
0.06
1.90 ± 0.20
2.90 –+ 0.20
0.05
■ Features
0.40 ± 0.20
5°
2
0.95
0.65 ± 0.15
1
0.95
2.80 +– 0.20
0.30
1.50 +– 0.25
0.05
3
+ 0.20
0 to 0.1 1.10 – 0.10
0.30
1.10 +– 0.10
10°
• High precision reference voltage: 1.26 V (allowance:
±2%)
• Low voltage operation: 1.26 V to 15 V
• Small type surface mounting package
MINI-3D
■ Applications
• Portable telephone, PHS, office automation equipment,
and other small-sized portable equipment
2
K
■ Block Diagram
Constant current source
1
Error
amplifier
Output
transistor
3
Reference voltage
A
Ref.
1
AN1432MS
Voltage Regulators
■ Pin Descriptions
Pin No.
Symbol
Description
1
Reference
The reference voltage (1.26 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.
2
Cathode
The pin for the combined use of the power source current supply of IC and the constant
voltage output as the shunt regulator. An excessive current supplied to this pin is bypassed
to the anode pin through the output transistor.
3
Anode
The constant voltage reference pin of the shunt regulator and flows out the current from
the cathode and reference. Usually grounded.
■ Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
VK
15
V
VREF
7
V
IK
20
mA
Reference current
IREF
50
µA
Cathode  anode reverse current
−IKA
−10
mA
Cathode  reference reverse current
−IKR
−10
mA
PD
104
mW
Topr
−30 to +85
°C
Tstg
−55 to +150
°C
Supply voltage
Reference voltage
Supply current
Power dissipation
*2
Operating ambient temperature
Storage temperature
*1
*1
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 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
Symbol
Range
Unit
VCC
VREF to 15
V
■ Electrical Characteristics at Ta = 25°C
Parameter
2
Symbol
Conditions
Min
Typ
Max
Unit
1.235
1.26
1.285
V
Reference voltage
VREF
VKA = VREF , IK = 10 mA
Reference voltage fluctuation 1
∆VREF
/∆VKA
VREF≤ VKA ≤ 5 V,
IK = 10 mA

1.9
3.5
mV/V
Reference voltage fluctuation 2
∆VREF
/∆VKA
5 V ≤ VKA ≤ 15 V,
IK = 10 mA

1.0
2.0
mV/V
Reference input current
IREF
RI = 10 kΩ, IK = 10 mA

2.5
4.4
µA
Minimum cathode current
IK min
VKA = VREF

290
350
µA
Off time cathode current
IK OFF
VKA = 15 V, VREF = 0 V


1.0
µA
Dynamic impedance
ZKA
VKA = VREF , f ≤ 1 kHz,
IK = 1 mA to 10 mA

0.1
0.5
Ω
Voltage Regulators
AN1432MS
■ Electrical Characteristics at Ta = 25°C (continued)
• 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
Reference value
Unit
3
mV
0.4
µA
■ Application Notes
• PD  Ta curves of mini-type 3-pin package
PD  T a
200
Power dissipation PD (mW)
175
Independent IC
Rth(j−a) = 625°C/W
PD = 200 mW (25°C)
150
125
104
100
75
50
25
0
0
25
50
75 85
100
125
150
Ambient temperature Ta (°C)
■ Application Circuit Example
This circuit amplifies the error voltage of the secondary side output voltage in the insulation type switching power
supply, then transfer it to the primary side via a photocoupler.
Replaceable with the conventional product (AN1431M/AN1431T).
(Primary side)
(Secondary side)
VOUT
AN1432
Primary side
to control IC
3