AS1431M5 [ETC]

Analog IC ; 模拟IC\n


型号：	AS1431M5
厂家：	ETC
描述：	Analog IC 模拟IC\n 模拟IC
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AS1431

Precision Adjustable Shunt Regulator

FEATURES

APPLICATIONS

•

Voltage Tolerance ................................................0.4%

•

Battery Operating Equipment

Adjustable Supplies

Wide Operating Current .....................1mA to 150mA

Extended Temperature Range ........... -55°C to 125°C

Low Temperature Coefficient ........................30 ppm/°C

Improved Replacement in Performance for LT1431

Offered In Small Low Power SOT-89 Package

Low Output Noise

Switching Power Supplies

Error Amplifiers

Single Supply Amplifiers

Monitors / VCR / TV

Personal Computers

PRODUCT DESCRIPTION

The AS1431 is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate 0.4% bandgap reference. AS1431 acts as

an open-loop error amplifier with a 2.5V temperature compensation reference. The AS1431 thermal stability, wide operating current

(150mA) and temperature range (125°C) makes it suitable for all varieties of applications that are looking for a low cost solution with

high performance. AS1431 tolerance of 0.4% is proven to be sufficient to overcome all of the other errors in the system to

virtually eliminate the need for trimming in the power supply manufactures assembly line and contribute a significant Cost

Savings.

In the standard shunt configuration, the combination of low temperature coefficient (T.C.), sharp turn-on characteristics, low output

impedance and programmable output voltage that makes this precision reference an excellent error amplifier.

The AS1431 is a direct improved replacement for the AS431 and TL431 in low voltage, low current applications.

PIN CONFIGURATIONS

Standard Pinout

SOT-23-5 (M5)

SOT-89 (M1)

AS1431

TO-92 (N)

8-Pin Surface Mount (S)

REF

ANODE

CATHODE

ANODE

N/C

REF

ANODE

N/C

AS1431

₃AS1431₆

REF

CATHODE

N/C

CATHODE

REF

ANODE

Front View

Top View

Bottom View

Rev. 10/5/00

AS1431

ORDERING INFORMATION

CATHODE (K)

Part

Temperature

Package

Type

Number

Range

AS1431N

-55°C to 125°C

TO-92

AS143S1/S2

AS1431M1

AS1431M5

SOIC

SOT-89

SOT-23-5

REFERENCE

(R)

2.5V

ANODE (A)

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

V_KA

I_AK

Rating

Units

Cathode-Anode Reverse Breakdown

Anode-Cathode Forward Current

Operating Cathode Current

Reference Input Current

Continuous Power Dissipation at 25°C

TO-92

I_KA

250

I_REF

P_D

775

200

°C

SOT-23

750

8L SOIC

1000

150

SOT-89

Junction Temperature

Storage Temperature

Lead Temperature (Soldering 10 sec.)

T_J

T_STG

T_L

- 65 to 150

300

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

TYPICAL THERMAL RESISTANCES

PARAMETER

Cathode Voltage

Cathode Current

SYMBOL RATING UNIT

PACKAGE

TO-92

0_JA

0_JC

TYPICAL DERATING

6.3 mW/°C

V_KA

I_K

V_REFto 20

160° C/W

80° C/W

SOT-23

575° C/W 150° C/W

1.7 mW/°C

SOIC

SOT-89

175° C/W

110° C/W

45° C/W

8° C/W

5.7 mW/°C

9.1 mW/°C

Rev. 10/5/00

AS1431

ELECTRICAL CHARACTERISTICS are guaranteed over full junction temperature range (-55°C to 125°C). Ambient

temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: V_KA= V_REFand

I_K= 10mA, unless otherwise specified.

Parameter

Symbol

Test Conditions

T_A= 25°C

Over Temp.

Test Circuit

Min

2.490

2.465

Typ

Max

2.510

2.535

0.16

Units

Reference Voltage

V_REF

2.500

V_REFwith Temp*

0.06

-1.1

mV/°

Ratio of Change in V_REF

to Cathode Voltage

Reference Input Current

I_REFTemp Deviation

Min I_Kfor Regulation

Off State Leakage

V_REF

V_K= 3V to 36V

-2

mV/V

I_REF

I_{K (min)}

I_{K (off)}

R_I= 10 k; R₂=

Over Temp.

0.7

0.4

0.04

1.9

1.2

µA

V_REF= 0V, V_KA

36V

250

Dynamic Output

Impedance

Z_KA

f < 1 kHz I_K1 to

100mA

0.15

0.2

Ω

Calculating Average Temperature Coefficient (TC)

∆

V_REF(mV)

TC in mV/°C =

∆

T_A

∆

V_REF

)

∆

V_REF

∆Τ

x 100

)

V_REFat 25°C

-10

TC in %/°C =

5000 0.5

∆

T_A

)

∆

V_REF

x 10⁶

)

V_REFat 25°C

-20

TC in ppm/°C =

-55 -25

25 50 75 100 125

Temperature (°C)

0.06 mV/°C

∆

T_A

0.002 %/°C

24 ppm/°C

TEST CIRCUITS

V_IN

V_KA= V_REF

V_IN

V_KA

V_IN

V_KA

I_REF

I_K

I_{K (OFF)}

R₁

(V_REF

I_REF

)

R₂

1a. Test Circuit 1

1b. Test Circuit 2

1c. Test Circuit 3

Figure

Rev. 10/5/00

AS1431

TYPICAL PERFORMANCE CURVES

High Current Operating Characteristics

Low Current Operating Characteristics

900

150

125

100

V_KA= V

Temperature Range:^R-^EF55 to 125 °C

800

V_KA= V

Temperature Range:^R-^EF55 to 125 °C

700

600

500

400

125 °C

25 °C

-55 °C

300

200

100

-25

-50

-75

-100

-200

-2

-1

-1.0

1.0

2.0

3.0

V_KA- Cathode Voltage (V)

Figure 3

V_KA- Cathode Voltage (V)

Figure 2

Off State Leakage

Reference Voltage vs. Ambient Temperature

100

2.53

V_KA= V_REF

I_K= 10

V_KA= 18V

V_REF= 0V

2.52

2.51

2.50

2.49

2.48

2.47

2.46

2.45

V_REF= 2.500 V at 25 °C

0.1

0.01

-60

-30

120

-60

-30

120

T_A- Ambient Temperature ( °C)

Figure 4

T_A- Ambient Temperature ( °C)

Figure 5

Rev. 10/5/00

AS1431

TYPICAL PERFORMANCE CURVES

Reference Input Current

Reference Voltage Line Regulation

3.0

-10

-20

-30

R1 = 10 k

R2 =

I_K= 10 mA

Ω

∞

2.5

2.0

1.5

1.0

0.5

-55 °C

0 °C

25 °C

75 °C

125 °C

-40

-50

-60

-30

120

T_A- Ambient Temperature ( °C)

Figure 6

V_KA- Cathode Voltage (V)

Figure 7

Noise Voltage

Low Frequency Dynamic Output Impedance

0.150

V_KA= V

REF

I_KA= 1 to 100 mA

f < 1 kHz

0.125

0.100

0.075

0.050

0.025

0.0

_KA= V

REF

I_K= 10 mA

T_A= 25 C

-60

-30

120

100

1 k

10 k

100 k

f - Frequency (Hz)

Figure 8

T_A- Free Air Temperature

Figure 9

Rev. 10/5/00

AS1431

TYPICAL PERFORMANCE CURVES

Dynamic Output Impedance

100

T_A= 25 °C

I_K= 1 to 100 mA

1.0

0.1

0.01

1 k

10 k

100 k

1 M

10 M

f - Frequency (Hz)

Figure 10

Small Signal Voltage Gain vs. Frequency

Temperature Range: -55 to 125 °C

I_K= 10 mA

OUT

230

Ω

I_K

15 k

9 µF

8.25 k

GND

1 k

10 k

100 k

1 M

10 M

f - Frequency (Hz)

Figure 11

Rev. 10/5/00

AS1431

TYPICAL PERFORMANCE CURVES

Pulse Response

INPUT

MONITOR

220

Ω

OUT

OUTPUT

Ω

f_P= 100 kHz

GND

-1

t - Time ( s)

Figure 12

Stability Boundary Conditions

100

A: V_KA= V_REF

B: V_KA= 5V at I _K= 10 mA

_KA= 10V at I _K= 10 mA

_KA= 15V at I _K= 10 mA

150

Ω

I_K

STABILITY

REGION

C_L

10 k

_A= 25 °C

10⁰

10¹

10²

10³

10⁴

10⁵

10⁶

10⁷

C_L- Load Capacitance (pF)

Figure 13

Rev. 10/5/00

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