ADMOS AMS3431CN, AMS3431CM, AMS3431BN, AMS3431BM, AMS3431AN Datasheet

Advanced AMS3431
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 AMS3431 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.
AMS3431 is available in the space saving SOT-23 package and in the TO-92 package.

ORDERING INFORMATION:

TOL. PACKAGE TYPE OPERATING

±0.25%
±0.5%
±1.0%

TO-92 3 LEAD SOT-23

AMS3431AN AMS3431AM
AMS3431BN AMS3431BM
AMS3431CN AMS3431CM

TEMPERATURE RANGE

-40 to +85° C

-40 to +85° C

-40 to +85° C

PIN CONNECTIONS

TO-92 3L SOT-23

Plastic Package (N) (M)

ANODE

1 2 3

CATHODE

ANODE

Bottom View Top View

REF

CATHODE REF

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

AMS3431

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 SOT-23 Package 0.28W

REF

-40°C to +125°C Thermal Resistance (ϕJA)

-65°C to +150°C
265°C

TO-92 Package
SOT-23 Package

160°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

= 0V

REF

REF

AMS3431A

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

AMS3431B

Min Typ Max

8.0

8.0

15
15

AMS3431C

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