AMS421

Advanced Monolithic Systems FEATURES • Trimmed 0.5% Tolerance • Wide Operating Current Range 0.1µA to 10mA • Low Reference Input Current 1.5nA • Low Dynamic Output Impedance • Low Output Noise • Nominal Temperature Range to 125°C • Temperature-Compensated: 50ppm/°C • Low supply current: typ. 10µA AMS421 0.5V SHUNT REGULATOR RoHS compliant APPLICATIONS • Battery Powered Systems • Switching Power Supplies • Isolated Power Supplies • Telecommunications • Error Amplifiers • Notebook/Personal Computer • Monitors/ VCR/ TV • Opto-isolator driver GENERAL DESCRIPTION The AMS421 is a four-terminal adjustable open collector shunt regulator with guaranteed temperature stability over the entire range of operation. The output voltage can be set to any value between 0.5V (VREF) and 15V by adding two external resistors. The AMS421 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. AMS421 is available 5 pin SOT-23 packages. ORDERING INFORMATION: PIN CONNECTIONS TOL. ±0.5% ±1.0% ±2.0% Package 5 LEAD SOT-23 AMS421AM1 AMS421BM1 AMS421CM1 OPERATING TEMP. RANGE -40 to + 125°C -40 to + 125°C -40 to + 125°C 5L SOT-23 (M1) VCC 1 GND 2 5 COLL BLOCK DIAGRAM VCC 1 5 Ref 4 Co N/C 3 4 REF Top View + 0.5V 2 GND Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (VCC) Continuous Collector Current (IC) Reference Input Current (IREF) Junction Temperature (TJ) Storage temperature Lead Temperature (Soldering, 10sec.) 15V 10mA 0.5mA -40°C to +125°C -65°C to +150°C 265°C Internal Power Dissipation (PD) SOT-23-5 Package Thermal Resistance (θJA) SOT-23-5 Package 410°C/W 0.3 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 ICOL =1 mA and TA = +25°C unless otherwise noted. Parameter Reference Voltage Deviation of Reference Voltage over Temperature Change in Reference Voltage to Supply Voltage Reference Input Current Reference Input Current Deviation over Temperature Off State Collector Current Dynamic Output Impedance Minimum Operating Current Input Supply Current VCOL = VREF TA = -40°C to +125°C ICOL = 100µA Vcc=1.4V to 15V ICOL = 0.1µA to 10mA ICOL = 0.1µA to 10mA TA = Full Range VREF = 0V f < 1KHz, ICOL =1 nA to 10mA VCOL = VREF ICOL = 100 µA 15 0.1 20 15 0.1 20 15 0.1 20 nA µA 0.04 0.35 0.1 0.5 0.04 0.35 0.1 0.5 0.04 0.35 0.1 0.5 nA Ω 0.5 5 0..5 5 0.5 5 nA Conditions Min 497.5 AMS421A Typ Max 500.0 0.5 502.25 2.5 Min 495.0 AMS421B Typ Max 500.0 0.5 505.0 3 Min 490.0 AMS421C Typ Max 500.0 0.5 510.0 5 Units mV mV 0.5 1.0 0.5 1.5 0.5 2 mV 0.1 0.7 0.1 0.7 0.1 0.7 nA RECOMMENDED OPERATING CONDITIONS: Collector Voltage, (VCOL) Collector Current, (ICOL) Min VREF 1µA Max 15 V 10mA Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 TYPICAL APPLICATIONS 1.5V ≤ VCC ≤ 15V 1.5V to 15V 0.1µF 1 5 10K VO 1.000V 100K Ref 4 + 0.47µF 0.5V 100K 500 pF 2 LOW NOISE PRECISSION 1.000V REFERENCE 2.5V ≤ VCC ≤ 15V VO Q1 0.1µ R3 1 5 4 + R1 0.47µF Co 0.5V R2 2 GND Low cost LDO using an External PNP Set the VOUT according to the following equation: R1 ⎞ ⎛ VOUT = VREF⎜1 + ⎟ + IREFR1 R2 ⎠ ⎝ Maximum output current is (PNP Hfe)10mA. The transistor current rating and package depends of the application dropout. The power dissipation for the PNP transistor is Iout (Vin-Vout). The package type should be selected according to the Power dissipation. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 TYPICAL PERFORMANCE CHARACTERISTICS Output voltage vs. Supply voltage @ 100 µA 1 0.8 0.6 mV 0.4 0.2 0 -0.2 0 5 Vcc 10 15 V out change 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2 Vout change Output resistance Vs load output res 4 6 8 10 Load step mA Supply Current vs Input Voltage @100uA load 30 25 uA 20 uA 15 10 5 0 0 10 Volts 20 30 IVcc uA Supply current vs load 200 180 160 140 120 100 80 60 40 20 0 1.00E-06 1.00E-05 1.00E-04 1.00E-03 1.00E-02 Load Ivcc uA Very low current regulation 0.51 0.505 Volts ouptut 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 Input output transfer characteristic Volts 0.5 0.495 0.49 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E09 08 07 06 05 04 03 load Vout Vout 1 2 3 4 5 Volts input Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Output rejection Load 1k /10n -30 -35 -40 -45 dB PSRR 0 -10 -20 dB -30 Vout -40 -50 -60 -70 10 100 1000 Hz 10000 100000 1000000 -50 -55 -60 -65 -70 1.00E+03 1.00E+04 Hz 1.00E+05 1.00E+06 Vout Input Bias Current 6 5 4 nA 3 2 1 0 5 10 Volts 15 20 Ibias 2 mA load Transient @ VCC=5V, Output Cap=10 nF 2 mA load Transient at VCC=15V, Output Cap=10nF Fast Start up 0-2V with common supply Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Slow Start up 0-2V with common supply Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 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) 0.037 (0.95) TYP 0.018-0.024 (0.457-0.610) 0.014-0.020 (0.350-0.50) 10° NOM 0.036-0.051 (0.090-1.30) 0.0035-0.0080 (0.090-0.20) 0.003 (0.150) MAX 0.075 (1.90) TYP 10° NOM 0.018-0.024 (0.457-0.610) (SOT-23-5 ) AMS DRW# 051001 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723