AMS3431

Advanced AMS3431 Monolithic PRECISION ADJUSTABLE SHUNT REGULATOR Systems

RoHS compliant FEATURES APPLICATIONS

• Trimmed 0.25% Reference • Battery Powered Systems • Wide Operating Current Range 250µA 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:

±0.25% ±0.5% ±1.0%

TO-92

Plastic Package (N)

123TOL. PACKAGE TYPE www.BDTIC.com/AMSOPERATING TO-92 3 LEAD SOT-23 TEMPERATURE RANGE

AMS3431AN AMS3431AM -40 to +85° C AMS3431BN AMS3431BM -40 to +85° C AMS3431CN AMS3431CM -40 to +85° C

PIN CONNECTIONS

3L SOT-23

(M)

ANODECATHODEANODE REF

Bottom View

CATHODEREF

Top View

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS3431

ABSOLUTE MAXIMUM RATINGS (Note 1)

Cathode Voltage (VZ)

Continuous Cathode Current (IZ) Reference Input Current (IREF) Junction Temperature (TJ) Storage Temperature

Lead Temperature (Soldering, 25sec.)

37V

-10mA to +150mA

10mA

-40°C to +125°C -65°C to +150°C

265°C

Internal Power Dissipation (PD) TO-92 Package 0.78W SOT-23 Package 0.28W

Thermal Resistance (ϕJA)

TO-92 Package 160°C/W SOT-23 Package 410°C/W

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. AMS3431A AMS3431B Parameter Conditions Min Typ Max Min Typ Max

Reference Voltage 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 = VREF (circuit 1) TA = +25°C to +85°C TA = -40°C to +25°C VZ from VREF to 10V VZ from VREF to 36V R1 =10kΩ, R2 = ∞Ω (test circuit 2)

AMS3431C

Min Typ Max

Units

2.489 2.495 2.501 2.483 2.495 2.507 2.470 2.495 2.520 V

8.0 8.0

-0.5 -1.0

15 15

8.0 8.0

15 15

8.0 8.0

15 15

mV mV

-2.7 -0.5 -2.7 -0.5 -2.7 mV/V -2.0

-1.0

-2.0

-1.0

-2.0

mV/V

www.BDTIC.com/AMS

0.04

0.5

0.04

0.5

0.5 4.0 0.5 4.0 0.5 4.0 µA

R1 =10kΩ, R2 = ∞Ω TA = Full Range

(test circuit 2) VZ = 36V, VREF = 0V

( test circuit 3) f < 1KHz, VZ = VREF IZ =100µA to 100mA (test circuit 1) VZ = VREF (test circuit 1)

0.4 1.2 0.4 1.2 0.4 1.2 µA

0.04 0.5 µA

0.25 0.5 0.25 0.5 0.25 0.5 Ω

100 250 100 250 100 250 µA

RECOMMENDED OPERATING CONDITIONS:

Min Max Cathode Voltage, (VZ) VREF 36 V Cathode Current, (IZ) 0.25mA 120mA

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS3431

TEST CIRCUITS

VINVZ = VREFVIN

VZ

VINVZIREFIZVREFR1IREFIZ OFFIZR2VREF

Figure 1. Test Circuit for VZ=VREF Figure 2. Test Circuit for VREF vs IZ

Test circuit for IREF.

Figure 3. Test Circuit for Off-State Current

TYPICAL APPLICATIONS

Shunt Regulator

V+R1VOSingle Supply Comparator with Temperature Compensated Threshold

V+VREFwww.BDTIC.com/AMSR2OUTVO ≈ (1+R1/R2)VREF

INVTH ≈ 2.5VVON ≈ 2VVOFF = V+GND

Series Regulator

V+

Higher Current Shunt Regulator

V+VO30ΩR10.01µFR1VOR2R1VO ≈ (1+R1/R2)VREF

VO ≈ (1+R1/R2)VREF

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS3431

TYPICAL APPLICATIONS (Continued)

Over Voltage/Under Voltage

Protection Circuit

V+R1BOUT ONWHENLOW < V+ < HIGHLIMIT LIMITVoltage Monitor

V+R1BR1AR1AR2AR2BR2AR2B

LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE LOW LIMIT ≈ VREF( 1+R1A/R2A)

LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE LED ON WHEN

LOW LIMIT ≈ VREF( 1+R1A/R2A) LOW LIMIT < V+ < HIGH LIMIT

Delay Timer

V+

Current Limiter or Current Source

IORCLwww.BDTIC.com/AMSV+RONCOFFDELAY = R*C*ln*V+/(V+)-VREF

IO =VREF/RCL

Constant Current Sink

V+IORS

IO = VREF/RS

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS3431

TYPICAL PERFORMANCE CHARACTERISTICS

Input Current vs VZΤΑ = 25°CVZ = VREFThermal Information1000REFERENCE VOLTAGE (V)INPUTT CURRENT (mA)150Input Current vs VZΤΑ = 25°CVZ = VREFINPUTT CURRENT (µA)50040030020010000IZ MIN100500TO-9250SOT-231.02.0CATHODE VOLTAGE (V)3.0100257085TEMPERATURE (° C)012501.02.0CATHODE VOLTAGE (V)3.0

PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.

www.BDTIC.com/AMS3L TO-92 PLASTIC PACKAGE (N)

0.180±0.005(4.572±0.127)0.060±0.010(1.524±0.254)0.140±0.010(3.556±0.127)

0.060±0.005(1.524±0.127)DIA0.180±0.005(4.572±0.127)0.90(2.286)NOM5° NOM0.500(12.70)MIN10° NOM0.050(1.270)MAXUNCONTROLLEDLEAD DIMENSIONS0.050±0.005(1.270±0.127)0.016±0.003(0.406±0.076)0.015±0.002(0.381±0.051)N (TO-92 ) AMS DRW# 042391

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

AMS3431

PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).

3 LEAD SOT-23 PLASTIC PACKAGE (M)

0.110-0.120(2.794-3.048)0.015-0.017(0.381-0.432)0.083-0.098(2.108-2.489)0.047-0.055(1.194-1.397)0.035-0.040(0.889-1.016)0.018-0.024(0.457-0.610)10°NOM0.035-0.041(0.089-1.041)www.BDTIC.com/AMS0.070-0.080(1.778-2.032)10°NOM0.018-0.024(0.457-0.610)0.0034-0.0050(0.086-0.127)0.0005-0.0040(0.013-0.102) (SOT-23 ) AMS DRW# 051991

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723