1.24V ADJUSTABLE PRECISION SHUNT REGULATORS Low-voltage operation
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
Low-voltage operation, down 1.24V 0.5%, reference voltage tolerance Adjustable output voltage, Vref Wide operating current range, 80µA 100mA dynamic output impedance, 0.05 typical Wide temperature range, Pin-to-pin replacement TLV431, SC431L Available SOT-23-3, SOT-23-5, SOT-89 TO-92 SO-8 GM432's low-voltage three-terminal adjustable precision shunt regulators with specified thermal stability over their full temperature range. Output voltage value from Vref (1.24V) using external resistors. Their active output circuitry provides very sharp turn-on characteristIc, making them excellent replacements zener diodes many applications such onboard regulation adjustable power supplies. home wide range applications, these versatile darlings ideal voltage references 3.0V 3.3V switching power suppies. With operational cathode current 80µA, batteries keep going. Whatever your application, GM432's offer optimum combination performance, reliability, economy. Applications include: Switching power supplies Linear regulators Adjustable power supplies Battery-operated computers, PDA's, portable devices Monitors, TV's, VCR's, camcorders Computer disk drives Instrumentation CONFIGURATIONS
SOT-23-3 (TOP VIEW)
CATHODE
ANODE
SOT-23-5 (TOP VIEW)
CATHODE
ANODE
SOT-89 (TOP VIEW)
ANODE
CATHODE
TO-92 (TOP VIEW)
CATHODE ANODE
SO-8 (TOP VIEW)
CATHODE ANODE ANODE
ANODE ANODE
BLOCK DIAGRAM (POSITIVE LOGIC)
CATHODE
LOGIC SYMBOL
REFERENCE REFERENCE
ANODE
CATHODE
Vref 1.24V
ANODE
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ABSOLUTE MAXIMUM RATINGS (over free-air temperature range except noted)
PARAMETER Cathode Voltage
SYMBOL Iref
MAXIMUM 0.37 0.49 0.95
UNIT
Continuous cathode current Reference input current Power dissipation SOT-23 SO-8 TO-92 Package thermal impedance SOT-23-3 SOT-23-5 TO-92 SO-8 Operating ambient temperature range Operating junction temperature range Lead temperature (soldering) seconds Storage temperature range rating (human body model)
TLEAD TSTG VESD
+150
These stress ratings only. Functional operation device these conditions beyond "recommended operatiing conditions" implied. Exposure absolute maximum rated conditions affect device reliability.
NOTES: Voltage values with respect anode except noted. Maximum power dissipation function TJ(max), Maximum allowable power dissipation allowable ambient temperature (TJ(max) TA)/JA. Operation absolute maximum affect device reliability. Package thermal impedance calculated JESD
RECOMMENDED OPERATING CONDITIONS
PARAMETER Cathode Voltage Cathode Current Operating free-air temperature range SYMBOL MINIMUM Vref 80µA MAXIMUM 100mA UNIT
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ELECTRICAL CHARACTERISTICS unless otherwise noted) GM432 (0.5%)
PARAMETER Reference Voltage Vref temp deviation Ratio change Vref change Reference input current Iref temp deviation Vref Vdev Vref Iref Iref(dev) CONDITION Vref, Vref,
1.234 C(1) 1.222
1.240
1.246 1.258
UNIT mV/V
Vref,
10mA, Vref 10mA, 10K, 10mA, full range
10K,
0.15
Minimum operating current Off-state cathode current Dynamic impedance
IK(min) IK(off)
Vref Vref 16V, Vref
0.125 0.135 0.05
0.150 0.150 0.15
1kHz, Vref, 100µA 100mA
GM432 (1.0%)
PARAMETER Reference Voltage Vref temp deviation Ratio change Vref change Reference input current Iref temp deviation Vref Vdev Vref Iref Iref(dev) CONDITION Vref, Vref,
1.228 C(1) 1.215
1.240 0.15
1.252 1.258
UNIT mV/V
Vref,
10mA, Vref 10mA, 10K, 10mA, full range
10K,
Minimum operating current Off-state cathode current Dynamic impedance
NOTES: test circuit page test circuit page test circuit page
IK(min) IK(off)
Vref Vref 16V, Vref
0.125 0.135 0.05
0.150 0.150 0.15
1kHz, Vref, 100µA 100mA
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ELECTRICAL CHARACTERISTICS unless otherwise noted) GM432 (2.0%)
PARAMETER Reference Voltage Vref temp deviation Ratio change Vref change Reference input current Iref temp deviation Vref Vdev Vref Iref Iref(dev) CONDITION Vref, Vref, C(1) Vref, 10mA, Vref 10mA, 10K, 10mA, full range Minimum operating current Off-state cathode current Dynamic impedance
NOTES: test circuit test circuit test circuit
1.215 1.200
1.240
1.265 1.280
UNIT mV/V
10K,
0.15
IK(min) IK(off)
Vref Vref 16V, Vref
0.125 0.135 0.05
0.150 0.150 0.15
1kHz, Vref, 100µA 100mA
TEST CIRCUITS
Vref Iref (off)
Iref
Test Circuit Vref
Test Circuit Vref
Test Circuit Off-State
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
TYPICAL APPLICATION CIRCUIT VOUT
VREF
GM432
Notes: VOUT according following equation:
VOUT VREF
IREF
Choose value follows:
maximum limit should such that cathode current, greater than minimum operating current (80µA) VIN(MIN)* minimum limit should such that cathode current,
does exceed 100mA under load conditions, instantanenous turn-on value does exceed Both following conditions must met:
VIN(max) Rmin
limit instantaneous turn-on
VIN(max) VOUT Rmin limit under normal operating conditions) IOUT(min) 100mA
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
Cathode Current Cathode Voltage
Cathode Current
25*C
Cathode Current (mA)
25*C
-0.5
Cathode Voltage
-0.5
Cathode Voltage
Ref. Voltage Junction Temperature
erence Input Current erence Voltage Open
Ref. Input Current Junction Temperature
1.2440
1.2420
1.2400
1.2380
1.2360
Junction Temperature
1.2340 Junction Temperature
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
STABILITY BOUNDARY CONDITIONS
Note About Stability
TA=25°C VKA=Vref
Cathode Current
Stable
VKA=2
VKA=3V
0.001 0.01
When using GM432 shunt regulator, optimize stability setting either load capacitance across GM432, decouple load; large capacitance across GM432, optional decoupling load. GM432 become unstable with capacitances approximately 10nF when cathode currents less than with instability increasing cathode current reduced. while GM432 happily stable example, cathode current 10mA with 0.1µF capacitor across oscillate transiently cathode current rises through region instability. avoid this problem completely, simply eliminate capacitor select very very high (e.g. 10µF) capacitor Since will probably want local decoupling load, best idea capacitance across device. Just resistance capacitance traces vias will prevent local load decoupling from causing transient oscillation during start-up. place GM432 right next load, with load decoupling capacitor directly across must capacitor $10µF.
Load Capacitance Ceramic Capacitors
Test Circuit Stability
Cathode Current
TA=25°C VKA=Vref
Stable
GM432
VKA=2 Device does Oscillate
0.01
0.001
Load Capacitance Tantalum Capacitors Stability boundary condition test shows that tantalum capacitors recommended minimize conditions that cause device oscillate.
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
Small Signal Voltage Gain/Phase Margin Small Signal Voltage Gain/Phase Margin Frequency Frequency
Small Signal Voltage Gain/Phase Margin
10mA
100K
Frequency
Test Circuit Small-Signal Gain Phase
GM432
8.25k
Revision 2002
Phase Shift degrees
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ORDERING INFORMATION
Tolerance PACKAGE
+150 +150 +150 +150 +150
0.5%
GM432A-ST23 GM432A-ST25 GM432A-S8 GM432A-TO92 GM432A-ST89
1.0% GM432B-ST23 GM432B-ST25 GM432B-S8 GM432B-TO92 GM432B-ST89
2.0% GM432C-ST23 GM432C-ST25 GM432C-S8 GM432C-TO92 GM432C-ST89
SOT- SOT- SO-8
SOT-89
NOTES: Shipped tape reel, 3000 units reel. Shipped tape reel, 2500 units reel. Available bulk pack 1000 units suffix), tape reel (3000 units reel, suffix-R) ammo pack (2000 units, suffix-A)
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
SOT-23-3 PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 0.900 0.000 0.900 0.300 0.080 2.800 1.200 2.250 0.950TYP 1.800 0.550TYP 0.300 0.500 2.000 1.100 0.100 1.000 0.500 0.150 3.000 1.400 2.550
Dimensions Inches 0.035 0.000 0.035 0.012 0.003 0.110 0.047 0.089 0.037TYP 0.071 0.022TYP 0.012 0.020 0.079 0.043 0.004 0.039 0.020 0.006 0.118 0.055 0.100
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
SOT-23-5 PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 1.050 0.000 1.050 0.300 0.100 2.820 1.500 2.650 0.950TYP 1.800 0.700REF 0.300 0.600 2.000 1.250 0.100 1.150 0.400 0.200 3.020 1.700 2.950
Dimensions Inches 0.041 0.000 0.041 0.012 0.004 0.111 0.059 0.104 0.037TYP 0.071 0.028REF 0.012 0.024 0.079 0.049 0.004 0.045 0.016 0.008 0.119 0.067 0.116
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
TO-92 PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 3.300 1.100 0.380 0.360 4.400 3.430 4.300 1.270TYP 2.440 14.100 0.000 2.640 14.500 1.600 0.380 3.700 1.400 0.550 0.510 4.700 4.700
Dimensions Inches 0.130 0.043 0.015 0.014 0.173 0.135 0.169 0.050TYP 0.096 0.555 0.000 0.104 0.571 0.063 0.015 0.146 0.055 0.022 0.020 0.185 0.185
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
SOT-89-3L PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 1.400 0.320 0.360 0.350 4.400 1.400 2.300 3.940 1.500TYP 2.900 0.900 3.100 1.100 1.600 0.520 0.560 0.440 4.600 1.800 2.600 4.250
Dimensions Inches 0.055 0.013 0.014 0.014 0.173 0.055 0.091 0.155 0.060TYP 0.114 0.035 0.122 0.043 0.063 0.020 0.022 0.017 0.181 0.071 0.102 0.167
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GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
SOP-8 PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 1.45 1.35 0.306 0.153 4.81 3.84 5.84 1.27 0.45 1.75 0.25 1.55 0.506 0.253 5.01 4.04 6.24
Dimensions Inches 0.057 0.004 0.053 0.012 0.006 0.189 0.151 0.23 0.05 0.018 0.039 0.069 0.01 0.061 0.02 0.01 1.197 0.159 0.246
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