Advanced Monolithic Systems AMS431L 1.2V SHUNT REGULATOR RoHS compliant FEATURES APPLICATIONS • Trimmed 0.5% Tolerance • Wide Operating Current Range 60µA to 100mA • Low Reference Input Current 0.4µA • Low Dynamic Output Impedance • Low Output Noise • Nominal Temperature Range to 85°C • Temperature-Compensated: 60ppm/°C • Battery Powered Systems • Switching Power Supplies • Adjustable Power Supplies • Telecommunications • Error Amplifiers • Notebook/Personal Computer • 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 (VREF) and 20V by adding two external resistors. The 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. ORDERING INFORMATION: TOL. PACKAGE TYPE TO-92 AMS431LAN AMS431LBN AMS431LCN ±0.5% ±1.0% ±2.0% SOT-89 AMS431LAL AMS431LBL AMS431LCL OPERATING 3 LEAD SOT-23 AMS431LAM AMS431LBM AMS431LCM 5 LEAD SOT-23 AMS431LAM1 AMS431LBM1 AMS431LCM1 TEMP. RANGE -40 to +85° C -40 to +85° C -40 to +85° C PIN CONNECTIONS TO-92 Plastic Package (N) SOT-89 (L) 3L SOT-23 (M) 5L SOT-23 (M1) ANODE 1 2 3 N/C 1 5 ANODE N/C 2 1 CATHODE REF ANODE REF Bottom View Advanced Monolithic Systems, Inc. 2 3 ANODE CATHODE Top View CATHODE 3 REF CATHODE Top View www.advanced-monolithic.com 4 REFERENCE Phone (925) 443-0722 Top View Fax (925) 443-0723 AMS431L ABSOLUTE MAXIMUM RATINGS (Note 1) Cathode Voltage (VZ) Continuous Cathode Current (IZ) Reference Input Current (IREF) Junction Temperature (TJ) 20V 100mA 3mA -40°C to +125°C Storage temperature Lead Temperature (Soldering, 25sec.) -65°C to +150°C 265°C Internal Power Dissipation (PD) TO-92 Package SOT-89 Package SOT-23-3 Package SOT-23-5 Package Thermal Resistance (θJA) TO-92 Package SOT-89 Package SOT-23-3 Package SOT-23-5 Package 0.78W 0.91W 0.28W 0.3 W 160°C/W 110°C/W 410°C/W 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 noted. Parameter Conditions Min Reference Voltage 1.234 AMS431LA Typ Max 1.240 1.246 Min 1.228 AMS431LB Typ Max 1.240 1.252 Min 1.215 AMS431LC Typ Max Units 1.240 1.265 V Deviation of Reference Input Voltage over Temperature VZ = VREF (circuit 1) TA = -40°C to +85°C 10 25 10 25 10 35 mV Ratio of Change in Reference Voltage to Cathode Voltage IZ = 10mA -0.5 -2.7 -0.5 -2.7 -0.5 -2.7 mV/V 0.15 0.5 0.15 0.5 0.15 0.5 µA 0.1 0.4 0.1 0.4 0.1 0.4 µA 0.04 0.1 0.04 0.1 0.04 0.1 µA 0.25 0.4 0.25 0.4 0.25 0.4 Ω 60 80 60 80 60 80 µA Reference Input Current Reference Input Current Deviation over Temperature Off State Cathode Current Dynamic Output Impedance Minimum Operating Current ∆V = from VREF R1 =10kΩ, R2 = ∞Ω (test circuit 2) R1 =10kΩ, R2 = ∞Ω TA = Full Range (test circuit 2) VZ = 6V, VREF = 0V ( test circuit 3) f < 1KHz, VZ = VREF IZ =100µA to 100mA (test circuit 1) VZ = VREF (test circuit 1) RECOMMENDED OPERATING CONDITIONS: Cathode Voltage, (VZ) Cathode Current, (IZ) Min VREF 80µA Advanced Monolithic Systems, Inc. Max 20 V 100mA www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS431L TEST CIRCUITS VZ = VREF VIN VZ VIN IREF R1 IZ VIN VZ IZ OFF IREF IZ VREF R2 Figure 1. Test Circuit for VZ=VREF VREF Figure 2. Test Circuit for VREF vs IZ. Test circuit for IREF. Figure 3. Test Circuit for Off-State Current TYPICAL APPLICATIONS VIN VOUT R1 VREF R2 GND 1) Set the VOUT according to the following equation: R1 ⎞ ⎛ VOUT = VREF⎜1 + ⎟ + IREFR1 R2 ⎠ ⎝ 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 VIN(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: Rmin ≥ VIN(max) (to limit instantaneous turn - on IZ ) 150mA Rmin ≥ VIN(max) - VOUT (to limit IZ under normal operating conditions ) IOUT(min) + 100mA Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS431L TYPICAL PERFORMANCE CHARACTERISTICS Cathode Current vs. Cathode Voltage 150 100 0 -100 -200 -1 -0.5 0.5 1 0 CATHODE VOLTAGE (V) 100 50 0 -50 -100 -150 -1.5 1.5 150 ∆VREF/∆VZ(-mV/V) IZ= 10mA R1= 10kΩ R2= ∞ 100 75 50 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (° C) -1 -0.5 0 0.5 1 CATHODE VOLTAGE (V) 0.40 1.244 1.242 1.240 IR= 60µA 1.238 1.236 1.234 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (° C) Off State Cathode Current vs. Junction Temperature 250 VREF= 0V 200 VR= 16V 150 100 50 VZ= 6V 0 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (° C) 100 IZ = 0.1 to 100mA VZ= V REF f< 1kHz 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (° C) Advanced Monolithic Systems, Inc. IZ= 100mA 1.246 Reference Impedance vs. Frequency REFERENCE IMPEDANCE (Ω) 0.50 0.45 1.5 Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Junction Temperature 1.2 1.1 IZ= 10mA ∆VZ= 16V to V REF 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (° C) Reference Impedance vs. Junction Temperature REFERENCE IMPEDANCE (Ω) REFERENCE INPUT CURRENT (nA) Reference Input Current vs. Junction Temperature 125 REFERENCE VOLTAGE (V) 200 1.248 T A =25° C VR= VREF CATHODE CURRENT(OFF STATE) (nA) TA =25° C VR= V REF CATHODE CURRENT (mA) CATHODE CURRENT (µA) 300 -300 Reference Voltage vs. Junction Temperature Cathode Current vs. Cathode Voltage TA =25° C 10 1 0.1 0.01 1 www.advanced-monolithic.com 100 1000 10 FREQUENCY (kHz) Phone (925) 443-0722 100000 Fax (925) 443-0723 AMS431L TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Small Signal Gain and Phase Shift vs. Frequency 70 -180 -225 60 -270 50 -315 40 -360 30 20 10 OUT IZ 10µF PHASE SHIFT (deg) SMALL SIGNAL GAIN (dB) 80 Small Signal Gain and Phase Shift Test Circuit 15k 232 + - 8.25k GND 0 -10 -20 100 1k 10k 100k FREQUENCY (Hz) 1000k Stability Boundary Condition Stability Circuit 3.5 CATHODE CURRENT (mA) T A =25° C 3.0 2.5 IZ Stable Stable + R1 CL - 2.0 R2 1.5 VZ = V REF 1.0 0.5 0.0 0.001 VZ = 2V 0.01 1 0.1 LOAD CAPACITANCE (µF) Advanced Monolithic Systems, Inc. 10 www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS431L PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3L TO-92 PLASTIC PACKAGE (N) 0.180±0.005 (4.572±0.127) 0.060±0.005 (1.524±0.127) DIA 0.060±0.010 (1.524±0.254) 0.90 (2.286) NOM 0.180±0.005 (4.572±0.127) 0.140±0.010 (3.556±0.127) 5° NOM 0.500 (12.70) MIN 0.050 (1.270) MAX UNCONTROLLED LEAD DIMENSIONS 0.015±0.002 (0.381±0.051) 0.016±0.003 (0.406±0.076) 0.050±0.005 (1.270±0.127) 10° NOM N (TO-92 ) AMS DRW# 042391 5 LEAD SOT-23 PLASTIC PACKAGE (M1) 0.110-0.120 (2.794-3.048) 0.102-0.118 (2.60-3.00) 0.059-0.070 (1.50-1.75) 0.014-0.020 (0.350-0.50) 0.037 (0.95) TYP 0.018-0.024 (0.457-0.610) 10° NOM 0.036-0.051 (0.090-1.30) 0.0035-0.0080 (0.090-0.20) 0.003 (0.150) MAX Advanced Monolithic Systems, Inc. 0.075 (1.90) TYP www.advanced-monolithic.com 10° NOM 0.018-0.024 (0.457-0.610) (SOT-23-5 ) AMS DRW# 051001 Phone (925) 443-0722 Fax (925) 443-0723 AMS431L 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° NOM 0.035-0.041 (0.089-1.041) 0.0034-0.0050 (0.086-0.127) 0.0005-0.0040 (0.013-0.102) 10° NOM 0.070-0.080 (1.778-2.032) 0.018-0.024 (0.457-0.610) (SOT-23 ) AMS DRW# 051991 SOT-89 PLASTIC PACKAGE (L) 0.173-0.181 (4.40-4.60) 0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44) 0.064-0.072 (1.62-1.83) 0.155-0.167 (3.94-4.25) 0.084-0.090 (2.13-2.29) 0.090-0.102 (2.29-2.60) 0.035-0.047 (0.89-1.20) 0.059 (1.50) BSC 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56) L (SOT-89 ) AMS DRW# 042392 0.118 (3.00) BSC Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723