100mA Dropout Voltage Regulators Power Management GM2950 GM2

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100mA Dropout Voltage Regulators Power Management GM2950 GM2

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GM2950/ GM2951
100mA Dropout Voltage Regulators
Power Management
GM2950 GM2951 power voltage regulator. This device excellent choice battery powered application such cordless telephone, radio control systems, portable computers. GM2950/GM2951 features very quiescent current (75µA Typ.) very drop output voltage (Typ. 40mV light load 380mV 100mA). This includes tight initial tolerance 0.5% typ., extremely good load line regulation 0.05% typ., very output temperature coefficient, making GM2950/ GM2951 useful lowpower voltage reference. error flag output feature used power-on reset warn output voltage, following batteries input. Other feature logic-compatible shutdown input which enable regulator switched off. GM2951 available 8-pin plastic packages. regulator output voltage pin-strapped volt programmed from 1.24 volt volts with external pair resistors. GM2950 offered 3-pin TO-92 package compatible with other fixed regulator.
Features
High accuracy output voltage Guaranteed 100mA output Very quiescent current dropout voltage Extremely tight load line regulation Very temperature coefficient Needs only stability Error Flag warns output dropout Logic-Controlled electronic shutdown Output programmable from 1.24
Application
Battery powered systems Cordless telephones Radio control systems Portable/Palm top/Notebook computers Portable consumer equipment Portable Instrumentation Avionics Automotive Electronics SMPS Post-Regulator Voltage Reference
Revision Feb. 2004
3.3µF
TYPICAL APPLICATION
+VIN +VIN ERROR VOUT
100KW
VOUT
VOUT
GM2951
0.01
3.3µF
SHUTDOWN INPUT
1.23V VREF
Pins Left open VOUT VREF(1
www.gammamicro.com
PRELIMINARY
GM2950/ GM2951
GM2950
ERROR OUTPUT
VOUT
GM2950/ GM2951
MARKING INFORMATION CONFIGURATIONS (TOP VIEW)
2950 AYWW Output Input Output Sense
SOP-8(SO-8)
Feedback Input VTAP ERROR
GM2951 VVAYWW
Ground Shutdown
Assembly Location Output Voltage Year Work Week
ORDERING INFORMATION
Ordering Number
GM2950-5.0T92B GM2950-5.0T92RL GM2951-5.0S8T GM2951-5.0S8R
Output Voltage
Package
TO-92 TO-92
Shipping
1,000 Units/ 2,000 Units/ Ammo Pack(Tape) Units/ Tube 2,500 Units/ Tape Reel
detail Ordering Number identification, please last page.
GM2950/ GM2951
GM2950/ GM2951
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Lead Temperature (Soldering, seconds) Storage Temperature Range Operating Junction Temperature Range Input Supply Voltage Feedback Input Voltage Shutdown Input Voltage Error Comparator Output
VALUE
+150 +150 -0.3 -1.5 -0.3 -0.3
UNITS
BLOCK DIAGRAM
Unregulated
Input Output Error Amplifier
VOUT 100mA
1.23V Reference
Ground
GM2950
Feedback
Input
Output
Form COMS Shutdown 60mV 1.23V Error Detection Comparator Error Amplifier
Sense VTAP ERROR Ground CMOS
GM2951
GM2950/ GM2951
Unregulated
VOUT 100mA
GM2950/ GM2951
ELECTRICAL CHARACTERISTICS
=25°C,V =15V;unlessotherwisenoted)
PARAMETER
Output Voltage Output Voltage
CONDITIONS
-25°C 85°C Full Operating Temperature 100µA 100mA, TJMAX
0.985 IV0I 0.98 IV0I 0.976 IV0I
1.015 IV0I 1.02 IV0I 1.024 IV0I
Units
Output Voltage Temperature Coefficient (Note Line Regulation (Note Load Regulation (Note Dropout Voltage (Note Ground Current Dropout Ground Current Current Limit Thermal Regulation 200µF 3.3µF (Bypass 0.01µF pins GM2951-XX) 100µA (Note
ppm/°C
0.04 0.05
100mA
100µA 100mA 100µA 100mA 0.5V, 100µA VOUT
Output Noise, 10Hz 100KHz
µVrms
Versions Only Reference Voltage Reference Voltage Feedback Bias Current Reference Voltage Temperature Coefficient Feedback Bias Current Temperature Coefficient Error Comparator Output Leakage Current Output Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis =30V 4.5V, 400µA (Note (Note (Note 0.01 (Note Over Temperature (Note 1.21 1.185 1.235 1.26 1.285 ppm/°C nA/°C
GM2950/ GM2951
GM2950/ GM2951 ELECTRICAL CHARACTERISTICS
=25°C,V =15V;unlessotherwisenoted)
PARAMETER
Shutdown Input Input Logic Voltage Shutdown Input Current
CONDITIONS
Units
(Regulator High(Regulator OFF) 2.4V (Note
Regulator Output Current Shutdown 3.3V 2.0V
VOUT 5.0V VOUT 5.0V VOUT 3.3V
Note Output reference voltage temperature coefficients defined worst case voltage change divided total temperature range. Note Unless otherwise specified limits guaranteed 25°C, 100µA 1µF. Additional conditions 8-pin versions feedback tied output tied output Sense (VOUT Vshutdown Note Regulations measured constant junction temperature, using pulse testing with duty cycle. Changes output voltage heating effects covered under specification thermal regulation. Note Line regulation GM2951-XX tested 150°C 1mA. 100µA 125°C, line regulation guaranteed design 0.2%. typical performance characteristics line regulation versus temperature load current. Note Dropout voltage defined input output differential which output voltage drops 100mV below nominal value measured differential. very values programmed output voltage, minimum input supply voltage (2.3V over temperature) must taken into account. Note 1V), 2.3V 30V, 100µA 100µA, JMAX
Note Output reference voltage temperature coefficient defined worst case voltage change divided total tempera ture range Note Comparator thresholds expressed terms voltage differential feedback terminal below nominal reference voltage measured input. express these thresholds terms output voltage change, multiply error amplifier gain +R2)/R2. example, programmed output voltage error output guaranteed when output drops 95mV 1.235V=384mV. Thresholds remain constant percent VOUT varied with dropout warning occurring typically below nominal, 7.5% guaranteed. Note shutdown 30V, Feed-back tied Tap.
GM2950/ GM2951
GM2950/ GM2951 TYPICAL CHARACTERISTICS
Quiescent Current (µA)
Output
Short Circuit Current (mA)
Dropout Voltage (mV)
100mA
100µA
Input Voltage (VOLTS)
Temperature (°C)
Temperature (°C)
Figure Quiescent Current
Figure Short Circuit Current
Figure Dropout Voltage
Minimum Operating Voltage Dropout Voltage (mV)
10mA 100mA
Output Current Temperature (°C) Bias Current (nA)
Temperature (°C)
100µA 25°C
Figure Dropout Voltage
Figure Minimum Operating Voltage (GM2951)
Figure Feedback Bias Current (GM2951)
GM2950/ GM2951
Feedback current (µA)
Driven External Source (Regulator open loop) Error Output
-100 -150 -200 125°C 25°C -55°C
Sink Current (mA)
Resistor External Supply
Input Voltage Resistor VOUT
125°C
Output Voltage (°C)
Hysteresis
25°C -55°C
-250 -2.0 -1.5 -1.0 -0.5
Feedback Voltage
Figure Feedback Current (GM2950)
Figure Error Comparator Output (GM2951)
Figure Comparator Sink Current (GM2951)
GM2950/ GM2951
APPLICATIONS INFORMATION
EXTERNAL CAPACITORS
1.0µF greater) capacitor required between output ground stability output voltages
more. lower output voltages, more capacitance required (2.2µF more recommended 3.3V versions). Without this capacitor part will oscillate. Most types tantalum aluminum electrolytics work fine here; even film types work recommended reasons cost. Many aluminum electrolytics have electrolytes that freeze about -30°C, solid tantalums recommended operation below -25°C. important parameters capacitor about less resonant frequency above kHz. value this capacitor increased without limit. lower values output current, less output capacitance required stability. capacitor reduced 0.33 currents below currents below Using adjustable versions voltages below runs error amplifier lower gains that more output capacitance needed. worst-case situation load 1.23V output (Output shorted Feedback) greater) capacitor should used. Unlike many other regulators, GM2950 will remain stable regulation with load addition internal voltage divider. This especially important CMOS keep-alive applications. When setting output voltage GM2951 versions with external resistors, minimum load recommended. tantalum aluminum electrolytic capacitor should placed from GM2950/GM2951 input ground there more than inches wire between input filter capacitor battery used input. Stray capacitance GM2951 Feedback terminal cause instability. This especially problem when using high value external resistors output voltage. Adding capacitor between Output Feedback increasing output capacitor least will this problem. ERROR DETECTION COMPARATOR OUTPUT comparator produces logic output whenever GM2951 output falls regulation more than approximately This figure comparator's built-in offset about divided 1.235 reference voltage. (Refer block diagram front datasheet.) This trip level remains below normal" regardless programmed output voltage 2951. example, error flag trip level typically 4.75V output 11.4V output. regulation condition either input voltage, current limiting, thermal limiting. Figure Below gives timing diagram depicting ERROR signal regulated output voltage GM2951 input ramped down. versions, ERROR signal becomes valid (low) about 1.3V input. goes high about input (the input voltage which VOUT 4.75V). Since GM2951's dropout voltage load-dependent (see curve typical performance characteristics), input voltage trip point (about will vary with load current. output voltage trip point (approx. 4.75V) does vary with load. error comparator open-collector output which requires external pull-up resistor. This resistor returned output some other supply voltage depending system requirements. determining value this resistor, note that while output rated sink this sink current adds battery drain battery condition. Suggested values range from 100k 1MW. resistor required this output unused.
4.75V Output Voltage *When 1.3V, error flag becomes high impedance, error flag voltage rises pull-up voltage. Using VOUT pull-up voltage (see Figure 11), rather than external source, will keep error flag voltage under 1.2V (typ.) this condition. user wish divide down error flag voltage using equal-value resistors suggested), ensure lowlevel logic signal during fault condition, while still allowing valid high logic level during normal operation. Input Voltage 1.3V
ERROR*
Figure10. ERROR Output Timing
GM2950/ GM2951
GM2950/ GM2951
PROGRAMMING OUTPUT VOLTAGE (GM2951) GM2951 pin-strapped nominal fixed output voltage using internal voltage divider tying output sense pins together, also tying feedback VTAP pins together. Alternatively, programmed output voltage between 1.235V reference maximum rating. seen Figure external pair resistors required. complete equation output voltage VOUT VREF IFBR1
where VREF nominal 1.235 reference voltage feedback bias current, nominally minimum recommended load current forces upper limit value regulator must work with load condition often found CMOS standby). will produce typical error VOUT which eliminated room temperature trimming better accuracy, choosing 100k reduces this error 0.17% while increasing resistor program current Since GM2951 typically draws 60µA load with open-circuited, this small price pay.
+VIN 100K ERROR OUTPUT +VIN ERROR
VOUT
GM2951 1.23V VREF
0.01
**SHUTDOWN INPUT
3.3µF
*See Application Hints
VOUT VREF
**Drive with TTL-Hing shut down. Ground leave open shutdown feature used. Note: Pins left open.
Figure Adjustable Regulator
GM2950/ GM2951
REDUCING OUTPUT NOISE reference applications advantageous reduce noise present output. method reduce regulator bandwidth increasing size output capacitor. This only noise reduced the3 lead GM2950 relatively inefficient, increasing capacitor from only decreases noise from bandwidth output. Noise reduced fourfold bypass capacitor across since reduces high frequency gain from unity. Pick CBYPASS 2pR1 200Hz about 0.01 When doing this, output capacitor must increased maintain stability. These changes reduce output noise from bandwidth output. With bypass capacitor added, noise longer scales with output voltage that improvements more dramatic higher output voltages.
GM2950/ GM2951 TO-92 PACKAGE OUTLINE DIMENSIONS
0.15
1.45
0.46
14.5
INDENT
0.191
+0.004 -0.002 +0.10 -0.05
0.38 0.015 1.27 1.27
0.15
Unit:
SOP-8(SO-8) PACKAGE OUTLINE DIMENSIONS
0.008 +0.0018 -0.0005
0.028
+0.022 -0.013 +0.56 -0.33
(0.20
+0.05 -0.01
(0.71
Layout
0.060 1.52
0.236 0.008
GM2950/ GM2951
0.154 0.063 0.005 (1.60 0.13)
(5.99
+0.21 -0.20
0.275
0.155
+0.003 -0.004
(3.91 0.1)
0.024
0.050 1.270
Inches
(4.85
0.057 (1.45)
Inches
0.0025 0.0015 (0.175 0.075)
0.050 (1.270)
0.016
+0.004 -0.003 +0.10 -0.08
(0.41
GM2950/ GM2951
ORDERING NUMBER
2950/ 2951
Gamma Micro. Shipping Ammo Pack Tape Reel Tube
(Tape)
Circuit Type
Output Voltage 5.0: 5.0V
Package T92: TO-92 SO-8
GM2950/ GM2951

100mA Dropout Voltage Regulators Power Management GM2950 GM2

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