ADMOS AMS431LCN, AMS431LCM1, AMS431LCM, AMS431LCL, AMS431LBN Datasheet

Advanced AMS431L

REFERENCE

Monolithic 1.2V SHUNT REGULATOR
Systems

FEATURES APPLICATIONS

•• Trimmed 0.5% Tolerance •• Battery Powered Systems

•• Wide Operating Current Range 60µµA to 100mA •• Switching Power Supplies

•• Low Reference Input Current 0.4µµA •• Adjustable Power Supplies

•• Low Dynamic Output Impedance •• Telecommunications

•• Low Output Noise •• Error Amplifiers

•• Nominal Temperature Range to 85°°C •• Notebook/Personal Computer

•• Temperature-Compensated: 60ppm/°°C •• Monitors/ VCR/ TV

•• Pagers

GENERAL DESCRIPTION

The AMS431L 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 1.24V (V
AMS431L features 0.5% initial tolerance, low dynamic output impedance and operates over a wide current range. 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, SOT-89, 3 pin SOT-23 and 5 pin SOT-23 packages.

) and 20V by adding two external resistors. The

REF

ORDERING INFORMATION:

TOL. PACKAGE TYPE OPERATING

±0.5%
±1.0%
±2.0%

TO-92 SOT-89 3 LEAD SOT-23 5 LEAD SOT-23

AMS431LAN AMS431LAL AMS431LAM AMS431LAM1
AMS431LBN AMS431LBL AMS431LBM AMS431LBM1
AMS431LCN AMS431LCL AMS431LCM AMS431LCM1

TEMP. RANGE

-40 to +85° C

-40 to +85° C

-40 to +85° C

PIN CONNECTIONS

TO-92 SOT-89 3L SOT-23 5L SOT-23

Plastic Package (N) (L) (M) (M1)

ANODE

REF

1 2 3

ANODE

CATHODE

1 2 3

CATHODEANODEREF

CATHODEREF

N/C ANODE
N/C12

CATHODE

3

5

4

Bottom View Top View Top View Top View

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

AMS431L

ABSOLUTE MAXIMUM RATINGS (Note 1)

Cathode Voltage (VZ) 20V Internal Power Dissipation (PD)
Continuous Cathode Current (IZ) 100mA 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 noted.

) 3mA SOT-89 Package 0.91W

REF

-40°C to +125°C

SOT-23-3 Package 0.28W
SOT-23-5 Package 0.3 W

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

TO-92 Package
SOT-89 Package
SOT-23-3 Package
SOT-23-5 Package

160°C/W
110°C/W
410°C/W
410°C/W

Parameter Conditions

Reference Voltage 1.234 1.240 1.246 1.228 1.240 1.252 1.215 1.240 1.265 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 = -40°C to +85°C

IZ = 10mA
∆V = from V
R1 =10kΩ, R2 = ∞Ω

(test circuit 2)
R1 =10kΩ, R2 = ∞Ω

TA = Full Range
(test circuit 2)

VZ = 6V, V
( test circuit 3)

f < 1KHz, VZ = V
IZ =100µA to 100mA

(test circuit 1)
VZ = V

(test circuit 1)

REF

REF

(circuit 1)

REF

= 0V

REF

REF

AMS431LA

Min Typ Max

10 25 10 25 10 35 mV

-0.5

0.15 0.5 0.15 0.5 0.15 0.5

0.1 0.4 0.1 0.4 0.1 0.4

0.04 0.1 0.04 0.1 0.04 0.1

0.25 0.4 0.25 0.4 0.25 0.4

60 80 60 80 60 80

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

AMS431LB

Min Typ Max

AMS431LC

Min Typ Max

Units

µA

µA

µA

Ω

µA

RECOMMENDED OPERATING CONDITIONS:

Min Max

Cathode Voltage, (VZ) V
Cathode Current, (IZ)

REF

80µA

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

20 V

100mA

TEST CIRCUITS

AMS431L

I

VZ = V

Z

V

IN

I

REF

V

REF

Figure 1. Test Circuit for VZ=V

TYPICAL APPLICATIONS

V

IN

R1

V

REF

R2

GND

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

OUT

V

IZ OFF

Z

1) Set the V

according to the following equation:

OUT

R1





1V V REFREFOUT +

+=



R2



R1I




2) Choose the value of R as follows:

• The maximum limit for R should be such that the cathode current, IZ is greater than the minimum operating current (80µA) at V

IN(min)

.

• The minimum limit for R should b such that IZ does not exceed 100mA under all load conditions, and the instantaneous turn-on value for IZ does not exceed

150mA. Both of the following conditions must be met:

V

IN(max)

min Ion - turnousinstantanelimit to

R ≥

R Z

min

≥

( )

150mA

V-V

OUTIN(max)

( )

OUT(min)

100mAI

+

Z

conditions operating normalunder Ilimit to

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