ADMOS AMS431CS, AMS431CN, AMS431CM, AMS431CL, AMS431BS Datasheet

Advanced AMS431
Monolithic PRECISION ADJUSTABLE SHUNT REGULATOR
Systems

FEATURES APPLICATIONS

•• Trimmed 0.25% Reference •• Battery Powered Systems

•• Wide Operating Current Range 250µµA to 150mA •• Switching Power Supplies

•• Low Dynamic Output Impedance •• Adjustable Power Supplies

•• Low Output Noise •• Linear Regulators

•• Nominal Temperature Range to 85°°C •• Error Amplifiers

•• Temperature-Compensated: 60ppm/°°C •• Notebook/Personal Computer

•• Internal Amplifier with 150mA Capability •• Monitors/ VCR/ TV

•• Pagers

GENERAL DESCRIPTION

The AMS431 is a three-terminal adjustable shunt regulator with guaranteed temperature stability over the entire range of
operation. The output voltage can be set to any value between 2.5V (VREF) and 36V by adding two external resistors. Due to
the sharp turn-on characteristics this device is an excellent replacement for zener diodes in many applications.
AMS431 is available in TO-92, SO-8, SOT-89 and SOT-23 packages.

ORDERING INFORMATION:

TOL. PACKAGE TYPE OPERATING

±0.25%
±0.5%
±1.0%

TO-92 8 LEAD SOIC SOT-89 3 LEAD SOT-23

AMS431AN AMS431AS AMS431AL AMS431AM
AMS431BN AMS431BS AMS431BL AMS431BM
AMS431CN AMS431CS AMS431CL AMS431CM

TEMP. RANGE

-40 to +85° C

-40 to +85° C

-40 to +85° C

PIN CONNECTIONS

TO-92 8L SOIC SOT-89 3L SOT-23

Plastic Package (N) SO Package (S) (L) (M)

ANODE

8
7
6
5

REF
ANODE
ANODE
N/C

1 2 3

CATHODEANODEREF

CATHODEREF

REF

1 2 3

ANODE

CATHODE

CATHODE

ANODE
ANODE

N/C

1
2
3
4

Bottom View Top View Top View Top View

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS431

ABSOLUTE MAXIMUM RATINGS (Note 1)

Cathode Voltage (VZ) 37V Internal Power Dissipation (PD)
Continuous Cathode Current (IZ) -10mA to +150mA TO-92 Package 0.78W
Reference Input Current (I
Junction Temperature (TJ)

Storage temperature
Lead Temperature (Soldering, 10sec.)

Note 1 : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at IZ =10 mA and TA = +25°C unless otherwise specified.

) 10mA SO-8 Package 0.71W

REF

-40°C to +125°C

SOT-89 Package 0.91W
SOT-23 Package 0.28W

-65°C to +150°C Thermal Resistance (ϕJA)
265°C

TO-92 Package
SO-8 Package
SOT-89 Package
SOT-23 Package

160°C/W
175°C/W
110°C/W
410°C/W

Parameter Conditions

Reference Voltage 2.489 2.495 2.501 2.483 2.495 2.507 2.470 2.495 2.520 V
Deviation of Reference

Input Voltage over
Temperature

Ratio of Change in
Reference Voltage to

Cathode Voltage
Reference Input Current

Reference Input Current
Deviation over
Temperature

Off State Cathode
Current

Dynamic Output
Impedance

Minimum Operating
Current

VZ = V
TA = +25°C to +85°C
TA = -40°C to +25°C

VZ from V
VZ from V

R1 =10kΩ, R2 = ∞Ω
(test circuit 2)

R1 =10kΩ, R2 = ∞Ω
TA = Full Range

(test circuit 2)
VZ = 36V, V

( test circuit 3)
f < 1KHz, VZ = V

IZ =100µA to 100mA
(test circuit 1)

VZ = V
(test circuit 1)

REF

REF

REF

REF

(circuit 1)

to 10V
to 36V

REF

Min Typ Max

= 0V

REF

AMS431A

Min Typ Max

8.0

8.0

-0.5

-1.0

0.5 4.0 0.5 4.0 0.5 4.0

0.4 1.2 0.4 1.2 0.4 1.2

0.04 0.5 0.04 0.5 0.04 0.5

0.25 0.5 0.25 0.5 0.25 0.5

100 250 100 250 100 250

15
15

-2.7 -0.5 -2.7 -0.5 -2.7 mV/V

-2.0 -1.0 -2.0 -1.0 -2.0 mV/V

AMS431B

8.0

8.0

15
15

AMS431C

Min Typ Max

8.0

8.0

15
15

Units

mV
mV

µA

µA

µA

Ω

µA

RECOMMENDED OPERATING CONDITIONS:

Min Max

Cathode Voltage, (VZ) V

REF

Cathode Current, (IZ) 0.25mA 120mA

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

36 V

TEST CIRCUITS

AMS431

I

VZ = V

Z

V

IN

I

REF

V

REF

Figure 1. Test Circuit for VZ=V

TYPICAL APPLICATIONS

Shunt Regulator

V+

R1

V

REF

R2

VO ≈ (1+R1/R2)V

REF

I

Z

REF

REF

V

Z

.

vs IZ.

V

IN

Figure 3. Test Circuit for Off-State Current

REF

REF

V

IN

R1

I

REF

V

R2

REF

Figure 2. Test Circuit for V

Test circuit for I

V

IZ OFF

Z

Single Supply Comparator with

Temperature Compensated Threshold

V

O

IN

V

≈ 2.5V

TH

V+

OUT

V

≈ 2V

ON

V

= V+

OFF

GND

Series Regulator Higher Current Shunt Regulator

V+

30Ω

0.01µF

R1

R2

VO ≈ (1+R1/R2)V

REF

V

O

VO ≈ (1+R1/R2)V

V+

R1

R1

REF

V

O

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]