Datasheet AS432CR5VS7, AS432CR5VS13, AS432CR5ST, AS432CR5SB, AS432CR5SA Datasheet (ASTEC)

1

ASTEC Semiconductor

AS432

1.24V Precision Adjustable Shunt Reference/Amplifier

Features

¥

Temperature-compensated:
50 ppm/¡C

¥

0.25% to 2.0% bandgap offered

¥

Internal amplifier with 150 mA
capability

¥

Multiple temperature ranges

¥

Low frequency dynamic output
impedance: < 150 m½

¥

Low output noise

Description

The AS432 is a three terminal adjustable shunt regulator utilizing an accurate

1.24V bandgap reference. The AS432 is functionally similar to an AS431 except
for its lower reference voltage, making it usable in a wide variety of low voltage
applications.

Because of its robust bipolar technology, the AS432 handles a wide range of cur­rent, and holds off more than 18V so its use is not limited to low power, low volt­age systems. Significant care has been taken to provide adequate AC bandwidth
to allow the AS432 as an amplifier in control systems and power electronics.

SEMICONDUCTOR

Pin Configuration Ñ Top view

Ordering Information

CATHODE

TO-92 (LP) SOIC (D)

ANODE

REFERENCE

REFERENCE

ANODE

ANODE

N/C

CATHODE

ANODE

ANODE

N/C

SOT-89 (S)

CATHODE

ANODE

REFERENCE

1

2

3

4

8

7

6

5

SOT-23/5L (DBV)

ANODE

REFERENCE

N/C

N/C

CATHODE

SOT-23/3L (VS)

CATHODE

REFERENCE

ANODE

Circuit Type:

1.24V Precision Adjustable
Shunt Regulator/Amplifier

Temperature Range:
A
B
C

Bandgap Tolerance:
2
1
R5
R25

= 0°C to 70°C
= 0°C to 105°C
= –40°C to +85°C

= ±2%
= ±1%
= ±0.5%
= ±0.25%

Packaging Option:
A
B
T
7
13

Package Style:
D
DBV
LP
S
VS

= Ammo Pack
= Bulk
= Tube
= Tape and Reel (7" Reel Dia)
= Tape and Reel (13" Reel Dia)

= SOIC
= SOT-23/5L
= TO-92
= SOT-89
= SOT-23/3L

AS432 A 2 D 7

2

ASTEC Semiconductor

AS432 1.24V Precision Adjustable Shunt Reference/Amplifier

Functional Block Diagram

Ð

+

REFERENCE

(R)

ANODE (A)

CATHODE (K)

1.24 V

Ð

+

Absolute Maximum Ratings

Parameter Symbol Rating Units

Cathode-Anode Reverse Breakdown V

KA

18 V

Anode-Cathode Forward Current I

AK

1 A

Operating Cathode Current I

KA

100 mA

Reference Input Current I

REF

1 mA

Continuous Power at 25¡C P

D

TO-92 775 mW

8L SOIC 750 mW

SOT-89 1000 mW

SOT-23/3L/5L 200 mW

Junction Temperature T

J

150 ¡C

Storage Temperature T

STG

Ð65 to 150 ¡C

Lead Temperature (Soldering 10 sec.) T

L

300 ¡C

Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sec­tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Recommended Conditions

Parameter Symbol Rating Unit

Cathode Voltage V

KA

V

REF

to 18 V

Cathode Current I

K

10 mA

Typical Thermal Resistances

Package θ

JA

θ

JC

Typical Derating

TO-92 160¡C/W 80¡C/W 6.3 mW/¡C

SOIC 175¡C/W 45¡C/W 5.7 mW/¡C

SOT-89 110¡C/W 8¡C/W 9.1 mW/¡C

SOT-23/3L/5L 575¡C/W 150¡C/W 1.7 mW/¡C

3

ASTEC Semiconductor

AS4321.24V Precision Adjustable Shunt Reference/Amplifier

Electrical Characteristics

Electrical characteristics are guaranteed over the full junction temperature range (0Ð105¡C). Ambient temperature must be derated
based upon power dissipation and package thermal characteristics. Unless otherwise stated, test conditions are: V

KA

= V

REF

and

IK= 10 mA.

Test AS432 (0.25%) AS432 (0.5%)

Parameter Symbol Condition Min. Typ. Max. Min. Typ. Max. Unit

Output Voltage V

REF

IK= 10 mA 1.237 1.240 1.243 1.234 1.240 1.246 V
TJ= 25¡C
VK= V

REF

Line Regulation ÆV

REF

VKA= 1.25 to 15 V 28 50 28 50 mV

Load Regulation ÆV

REF

IK= 1 to 100 mA 3.9 6 3.9 6 mV

Temperature Deviation ÆV

REF

0 < TJ< 105¡C 5 10 5 10 mV

Reference Input Current I

REF

2.3 6 2.3 6 µA

Reference Input Current ÆI

REF

0 < TJ< 105¡C 0.14 0.6 0.14 0.6 µA

Temperature Coefficient

Minimum Cathode I

K(min)

0.2 1 0.2 1 mA

Current for Regulation

Off State Leakage I

K(min)

V

REF

= 0 V, 0.04 500 0.04 500 nA

VKA= 15 V

Test AS432 (1.0%) AS432 (2.0%)

Parameter Symbol Condition Min. Typ. Max. Min. Typ. Max. Unit

Output Voltage V

REF

IK= 10 mA 1.228 1.240 1.252 1.215 1.240 1.256 V
TJ= 25¡C
VK= V

REF

Line Regulation ÆV

REF

VKA= 1.25 to 15 V 28 50 28 50 mV

Load Regulation ÆV

REF

IK= 1 to 100 mA 3.9 6 3.9 6 mV

Temperature Deviation ÆV

REF

0 < TJ< 105¡C 5 12 5 12 mV

Reference Input Current I

REF

2.3 6 2.3 6 µA

Reference Input Current ÆI

REF

0 < TJ< 105¡C 0.14 0.6 0.14 0.6 µA

Temperature Coefficient

Minimum Cathode I

K(min)

0.2 1 0.2 1 mA

Current for Regulation

Off State Leakage I

K(min)

V

REF

= 0 V, 0.04 500 0.04 500 nA

VKA= 15 V

*Temperature deviation is defined as the maximum deviation of the reference over the given temperature range and does not imply
an incremental deviation at any given temperature.

4

ASTEC Semiconductor

AS432 1.24V Precision Adjustable Shunt Reference/Amplifier

Test Circuits

Figure 1a. Test Circuit 1 Figure 1b. Test Circuit 2 Figure 1c. Test Circuit 3

R

1

R

2

I

K

V

IN

V

KA

(V

REF

)

I

REF

I

REF

I

K

V

IN

VKA = V

REF

I

K (OFF)

V

IN

VKA

Typical Performance Curves

*Calculating Average Temperature Coefficient (TC)

0

–5

–10

0.22000

0 0

0 15

0.021 mV/°C

0.008%/°C

8.0 ppm/°C

30 45 60 75 90 105

ppm

mV

%

∆V

REF

∆T

Temperature (°C)

• TC in mV/°C =

• TC in %/°C =

∆T

A

∆T

A

X 100

∆V

REF

(mV)

V

REF

at 25°C

∆V

REF

• TC in ppm/°C =
∆T

A

X 10

6

V

REF

at 25°C

∆V

REF

5

ASTEC Semiconductor

AS4321.24V Precision Adjustable Shunt Reference/Amplifier

Typical Performance

Figure 2

Figure 4

Figure 3

Figure 5

VKA – Cathode Voltage (V)

I

K

– Cathode Current (µA)

–0.5 0 0.5 1.0 1.5

–200

–100

0

100

200

300

400

500

600

700

800

900

Low Current Operating Characteristics

–55°C

25°C

125°C

I

K

– Cathode Current (mA)

VKA – Cathode Voltage (V)

–2 –1 0 1 2

–100

–75

–50

–25

0

25

50

75

100

125

150

175

High Current Operating Characteristics

VKA = V

REF

Temperature Range –55 to 125°C

–60 –30 0 30

T

A

– Ambient Temperature (°C)

60 90 120

I

Z

off – Off State Cathode Current (nA)

100

10

1

0.1

0.01

Off State Leakage

VKA = 15 V
V

REF

= 0 V

–60 –30 0 30

T

A

– Ambient Temperature (°C)

60 90 120

V

REF

– Reference Voltage (V)

1.27

1.26

1.25

1.24

1.23

1.22

1.21

1.20

1.19

Reference Voltage vs Ambient Temperature

VKA = V

REF

IK = 10 mA

V

REF

= 1.240 V at 25°C

6

ASTEC Semiconductor

AS432 1.24V Precision Adjustable Shunt Reference/Amplifier

Typical Performance Curves

Figure 6

Figure 8

Figure 7

Figure 9

–60 –30 0 30

T

A

– Ambient Temperature (°C)

60 90 120

I

REF

– Reference Input Current (µA)

2.4

2.3

2.2

2.1

2.0

Reference Input Current

R1 = 10 kΩ
R2 = ∞
I

K

= 10 mA

0 3 6 9 12 15 18

–40°C

25°C

75°C

125°C

VKA – Cathode Voltage (V)

∆V

REF

– Change in Reference Voltage (mV)

0

–10

–20

–30

–40

–50

Reference Voltage Line Regulation

IK = 10 mA

Temperature Range: –55 to 125°C

10 100 1 k 10 k 100 k

f – Frequency (Hz)

70

60

50

40

30

20

10

0

Noise Voltage nV/√Hz

Noise Voltage

VKA = V

REF

IK = 10 mA
T

A

= 25°C

–60 –30 0 30

T

A

– Free Air Temperature (°C)

60 90 120

40

30

20

10

0

Z

KA

– Dynamic Impedance (mΩ)

Low Frequency Dynamic Output Impedance

VKA = V

REF

VKA = 1 to 100 mA
f ≤ 1kHz

7

ASTEC Semiconductor

AS4321.24V Precision Adjustable Shunt Reference/Amplifier

Typical Performance Curves

Figure 10

Figure 11

100

10

1.0

Z

KA

– Dynamic Impedance (Ω)

0.1

0.01
1 k 10 k 100 k

f – Frequency (Hz)

1 M 10 M

TA = 25°C
I

K

= 1 to 100 mA

Dynamic Output Impedance

80

70

60

50

40

30

20

10

0

1 k 10 k 100 k 1 M 10 M

f – Frequency (Hz)

230 Ω

I

K

A

V

– Small Signal Voltage Gain (dB)

Temperature Range: –55° to 125°C

I

K

= 10 mA

OUT

GND

15 k

8.25 k

9 µF

Small Signal Voltage Gain vs. Frequency

8

ASTEC Semiconductor

AS432 1.24V Precision Adjustable Shunt Reference/Amplifier

Typical Performance Curves

Figure 12

Figure 13

4

3

Input and Output Votages (V)

2

1

0

–1

0 1 2 3 4 5 6 7

t – Time (µs)

8 9 10 11 12

Input

Output

Pulse Response

INPUT
MONITOR

220 Ω

50 Ω

OUT

GND

fP = 100 kHz

100

90
80
70
60

50
40
30
20

10

0

10

0101

10210

3

CL – Load Capacitance (pF)

10

4105106107

150 Ω

C

L

10 K

I

K

A

C

D

B

T

A

= 25°C

Stability Boundary Conditions

Stability
Region

I

K

– Cathode Current (mA)

A: VKA = V

REF

B: VKA = 5 V at IK = 10 mA
C: V

KA

= 10 V at IK = 10 mA

D: V

KA

= 15 V at IK = 10 mA