AMS421_07 ADMOS | Alldatasheet

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Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 Advanced AMS421 Monolithic 0.5V SHUNT REGULATOR Systems RoHS compliant FEATURES APPLICATIONS

  • Trimmed 0.5% Tolerance • Battery Powered Systems
  • Wide Operating Current Range 0.1µA to 10mA • Switching Power Supplies
  • Low Reference Input Current 1.5nA • Isolated Power Supplies
  • Low Dynamic Output Impedance • Telecommunications
  • Low Output Noise • Error Amplifiers
  • Nominal Temperature Range to 125°C • Notebook/Personal Computer
  • Temperature-Compensated: 50ppm/°C • Monitors/ VCR/ TV
  • Low supply current: typ. 10µA • 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 (V REF) and 15V by adding two external resistors. The AMS421 features 0.5% initial toleran ce, low dynamic output impedance and opera tes 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. Package

5 LEAD SOT-23

TEMP. RANGE ±0.5% AMS421AM1 -40 to + 125°C ±1.0% AMS421BM1 -40 to + 125°C ±2.0% AMS421CM1 -40 to + 125°C BLOCK DIAGRAM 5L SOT-23 (M1) VCC COLL N/C REF GND 3 4 Top View VCC GND Ref 0.5V Co

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) 15V Internal Power Dissipation (P D) Continuous Collector Current (IC) 10mA SOT-23-5 Package 0.3 W Reference Input Current (IREF) 0.5mA Junction Temperature (TJ) -40°C to +125°C Thermal Resistance (θJA) Storage temperature -65°C to +150°C SOT-23-5 Package 410°C/W Lead Temperature (Soldering, 10sec.) 265°C 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 Conditions AMS421A Min Typ Max AMS421B Min Typ Max AMS421C Min Typ Max Units Deviation of Reference Voltage over Temperature V COL = VREF TA = -40°C to +125°C 0.5 2.5 0.5 0.5 mV Change in Reference Voltage to Supply Voltage I COL = 100µA Vcc=1.4V to 15V Reference Input Current ICOL = 0.1µA to 10mA 0.5 5 0..5 5 0.5 5 nA Reference Input Current Deviation over Temperature I COL = 0.1µA to 10mA TA = Full Range Off State Collector Current VREF = 0V Dynamic Output Impedance f < 1KHz, ICOL =1 nA to 10mA Minimum Operating Current VCOL = VREF 0.1 0.1 0.1 nA Input Supply Current I COL = 100 µA 15 20 15 20 15 20 µA RECOMMENDED OPERATING CONDITIONS: Min Max Collector Voltage, (VCOL) VREF 15 V Collector Current, (ICOL) 1µA 10mA

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 TYPICAL APPLICATIONS LOW NOISE PRECISSION 1.000V REFERENCE Low cost LDO using an External PNP Set the V OUT according to the following equation: 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. 0.5V 2.5V ≤ VCC ≤ 15V 0.1µ 0.47µF Co VO GND R1IR2 R11V V REFREFOUT +⎟ ⎛ += 1.5V ≤ VCC ≤ 15V 1.5V to 15V 0.1µF 1 10K VO 1.000V 100K 0.47µF 100K 500 pF Ref 0.5V

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 TYPICAL PERFORMANCE CHARACTERISTICS Vout change -0.2 0.2 0.4 0.6 0.8 0 5 10 15 Vcc mV Vout change Output resistance Vs load 0.1 0.2 0.3 0.4 0.5 0.6 02468 1 0 Load step mA output res Supply Current vs Input Voltage @100uA load 01 0 2 0 3 0 Volts uA IVcc uA Supply current vs load 100 120 140 160 180 200 Load uA Ivcc uA Very low current regulation 0.49 0.495 0.5 0.505 0.51 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- load Volts Vout Input output transfer characteristic 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 012345 Volts input Volts ouptut Vout Output voltage vs. Supply voltage @ 100 µA

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS421 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) PSRR -70 -60 -50 -40 -30 -20 -10 10 100 1000 10000 100000 1000000 Hz dB Vout Output rejection Load 1k /10n -70 -65 -60 -55 -50 -45 -40 -35 -30 1.00E+03 1.00E+04 1.00E+05 1.00E+06 Hz dB Vout Input Bias Current 51 0 1 5 2 0 Volts nA 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)

0.059-0.070 (1.50-1.75) 0.014-0.020 (0.350-0.50) 0.110-0.120 (2.794-3.048) 0.102-0.118 (2.60-3.00) 0.037 (0.95) TYP 0.075 (1.90) TYP 0.018-0.024 (0.457-0.610) 10° NOM 0.0035-0.0080 (0.090-0.20) (SOT-23-5 ) AMS DRW# 051001 0.036-0.051 (0.090-1.30) 0.003 (0.150) MAX 0.018-0.024 (0.457-0.610) 10° NOM