LP2950 LP2951 Micropower Voltage Regulators LP2950 LP2951 micropo
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LP2950 LP2951 Micropower Voltage Regulators
LP2950 LP2951 micropower voltage regulators that specifically designed maintain proper regulation with extremely input-to-output voltage differential. These devices feature very quiescent bias current capable supplying output currents excess Internal current thermal limiting protection provided. LP2951 three additional features. first Error Output that used signal external circuitry regulation condition, microprocessor power-on reset. second feature allows output voltage preset output (depending version) programmed from 1.25 consists pinned resistor divider along with direct access Error Amplifier feedback input. third feature Shutdown input that allows logic level signal turn-off turn-on regulator output. input-to-output voltage differential bias current specifications, these devices ideally suited battery powered computer, consumer, industrial equipment where extension useful battery life desirable. LP2950 available three case DPAK packages, LP2951 available eight dual-in-line, SO-8 Micro-8 surface mount packages. suffix devices feature initial output voltage tolerance 0.5%. LP2950 LP2951 Features:
MICROPOWER DROPOUT VOLTAGE REGULATORS
SUFFIX PLASTIC PACKAGE CASE (TO-226AA/TO-92)
Pin: Output Ground Input
SUFFIX PLASTIC PACKAGE CASE 369A (DPAK)
Pin: Input Ground Output
Quiescent Bias Current Input-to-Output Voltage Differential 0.5% Allows Regulator Reference Extremely Tight Line Load Regulation Requires Only Output Capacitor Stability Internal Current Thermal Limiting
(Top View) Heatsink surface (shown terminal case outline drawing) connected
SUFFIX PLASTIC PACKAGE CASE (SO-8)
LP2951 Additional Features: Error Output Signals Regulation Condition Output Programmable from 1.25 Logic Level Shutdown Input
SUFFIX PLASTIC PACKAGE CASE
SUFFIX PLASTIC PACKAGE CASE 846A (Micro-8)
Output Sense Shutdown (See Following Page Ordering Information.)
Motorola, Inc. 1996
(Top View)
Input Feedback Error Output
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
ORDERING INFORMATION
Device LP2950CZ-** LP2950ACZ-** LP2950CDT-** LP2950ACDT-** LP2951CD LP2951ACD LP2951CD-** LP2951ACD-** LP2951CN LP2951ACN LP2951CN-** LP2951ACN-** LP2951CDM LP2951ACDM LP2951CDM-** LP2951ACDM-** Type Operating Temperature Range Package TO-92/TO-226AA Fixed Voltage (3.0, Adjustable Fixed Adjustable Fixed (3.0, Adjustable Fixed Adjustable Fixed (3.0, Adjustable Fixed Adjustable Fixed (3.0, Micro-8 Micro -40° +125°C 125°C Plastic SO-8 DPAK
Voltage option 3.0,
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
Device (±1%) LP2950CX-5.0 LP2950CX-3.3 LP2950CX-3.0 LP2951CX LP2950CX-3.3 LP2951CX-3.0
Package suffix.
Device (±0.5%) LP2950ACX-5.0 LP2950ACX-3.3 LP2950ACX-3.0 LP2951ACX LP2951ACX-3.3 LP2951ACX-3.0
Nominal Voltage Adjustable Adjustable Adjustable
Representative Block Diagrams
Input Battery Unregulated Error Amplifier 1.23 Reference Battery Unregulated Input Output Sense V/100 Error Amplifier Feedback Output V/100
LP2950CZ-5.0
Shutdown From CMOS/TTL
Error Output CMOS/TTL
1.23 Reference
Error Detection Comparator
LP2951CD
This device contains active transistors.
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
MAXIMUM RATINGS 25°C, unless otherwise noted.)
Input Voltage Power Dissipation Thermal Characteristics Maximum Power Dissipation Case 751(SO-8) Suffix Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 369A (DPAK) Suffix [Note Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case (TO-226AA/TO-92) Suffix Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case Suffix Thermal Resistance, Junction-to-Ambient Case 846A (Micro-8) Suffix Thermal Resistance, Junction-to-Ambient Feedback Input Voltage Internally Limited -1.5 -0.3 -0.3 °C/W °C/W °C/W °C/W °C/W °C/W °C/W °C/W
Rating
Symbol
Value
Unit
Shutdown Input Voltage Error Comparator Output Voltage Operating Junction Temperature Storage Temperature Range Verr +125 +150 Tstg
NOTE: Junction-to-Ambient Thermal Resistance determined board copper area Figure data available upon request.
ELECTRICAL CHARACTERISTICS (Vin 25°C [Note unless otherwise
noted.) Characteristic Output Voltage, Versions 25°C LP2950C-5.0/LP2951C LP2950AC-5.0/LP2951AC +125°C LP2950C-5.0/LP2951C LP2950AC-5.0/LP2951AC +125°C LP2950C-5.0/LP2951C LP2950AC-5.0/LP2951AC Output Voltage, Versions 25°C LP2950C-3.3/LP2951C-3.3 LP2950AC-3.3/LP2951AC-3.3 +125°C LP2950C-3.3/LP2951C-3.3 LP2950AC-3.3/LP2951AC-3.3 +125°C LP2950C-3.3/LP2951C-3.3 LP2950AC-3.3/LP2951AC-3.3 Output Voltage, Versions 25°C LP2950C-3.0/LP2951C-3.0 LP2950AC-3.0/LP2951AC-3.0 +125°C LP2950C-3.0/LP2951C-3.0 LP2950AC-3.0/LP2951AC-3.0 +125°C LP2950C-3.0/LP2951C-3.0 LP2950AC-3.0/LP2951AC-3.0 Symbol 4.950 4.975 4.900 4.940 4.880 4.925 3.267 3.284 3.234 3.260 3.221 3.254 2.970 2.985 2.940 2.964 2.928 2.958 3.000 3.000 3.030 3.015 3.060 3.036 3.072 3.042 3.300 3.300 3.333 3.317 3.366 3.340 3.379 3.346 5.000 5.000 5.050 5.025 5.100 5.060 5.120 5.075 Unit
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
ELECTRICAL CHARACTERISTICS (continued) (Vin 25°C [Note unless otherwise
noted.) Characteristic Line Regulation (Vin VO(nom) +1.0 [Note LP2950C-XX/LP2951C/LP2951C-XX Load Regulation LP2950C-XX/LP2951C/LP2951C-XX Dropout Voltage Supply Bias Current Dropout Supply Bias Current (Vin VO(nom) [Note Current Limit Shorted Ground) Thermal Regulation Output Noise Voltage kHz) [Note LP2951A/LP2951AC ONLY Reference Voltage 25°C) LP2951C/LP2951C-XX LP2951AC/LP2951AC-XX Reference Voltage +125°C) LP2951C/LP2951C-XX LP2951AC/LP2951AC-XX Reference Voltage +125°C) LP2951C/LP2951C-XX LP2951AC/LP2951AC-XX Feedback Bias Current ERROR COMPARATOR Output Leakage Current (VOH Output Voltage (Vin Upper Threshold Voltage (Vin Lower Threshold Voltage (Vin Hysteresis (Vin SHUTDOWN INPUT Input Logic Voltage Logic (Regulator "On") Logic (Regulator "Off") Shutdown Input Current Vshtdn Vshtdn Regulator Output Current Shutdown Mode (Vin Vshtdn Connected Vshtdn Ishtdn Ioff Ilkg Vthu Vthl 0.01 Vref 1.210 1.220 Vref 1.200 1.200 Vref 1.185 1.190 1.285 1.270 1.270 1.260 1.235 1.235 1.260 1.250 Symbol Regline Regload ICCdropout ILimit Regthermal 0.05 0.20 µVrms 0.13 0.05 0.20 0.10 0.08 0.04 0.20 0.10 Unit
NOTES: duty pulse techniques used during test maintain junction temperature close ambient possible. VO(nom) part number voltage option. Noise tests LP2951 made with 0.01 capacitor connected across Pins
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
DEFINITIONS
Dropout Voltage input/output voltage differential which regulator output longer maintains regulation against further reductions input voltage. Measured when output drops below nominal value (which measured differential), dropout voltage affected junction temperature, load current minimum input supply requirements. Line Regulation change output voltage change input voltage. measurement made under conditions dissipation using pulse techniques such that average chip temperature significantly affected. Load Regulation change output voltage change load current constant chip temperature. Maximum Power Dissipation maximum total device dissipation which regulator will operate within specifications. Bias Current Current which used operate regulator chip delivered load. Figure Quiescent Current
LP2950/LP2951 BIAS CURRENT (mA) Vout OUTPUT VOLTAGE LP2951C 25°C
Output Noise Voltage voltage output, with constant load input ripple, measured over specified frequency range. Leakage Current Current drawn through bipolar transistor collector-base junction, under specified collector voltage, when transistor "off". Upper Threshold Voltage Voltage applied comparator input terminal, below reference voltage which applied other comparator input terminal, which causes comparator output change state from logic "1". Lower Threshold Voltage Voltage applied comparator input terminal, below reference voltage which applied other comparator input terminal, which causes comparator output change state from logic "0". Hysteresis difference between Lower Threshold voltage Upper Threshold voltage.
Figure Dropout Characteristics
0.01
LOAD CURRENT (mA)
Vin, INPUT VOLTAGE
Figure Input Current
BIAS CURRENT Load Current Load Vin, INPUT VOLTAGE 5.00 4.99 4.98 4.97 4.96
Figure Output Voltage versus Temperature
Vout OUTPUT VOLTAGE
LP2951C 4.95
AMBIENT TEMPERATURE (°C)
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
Figure Dropout Voltage versus Output Current
DROPOUT VOLTAGE (mV) 25°C DROPOUT VOLTAGE (mV)
Figure Dropout Voltage versus Temperature
DROPOUT VOLTAGE (mV) OUTPUT VOLTAGE CHANGE (mV) OUTPUT VOLTAGE CHANGE (mV)
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
Figure Error Comparator Output
Vout OUTPUT VOLTAGE 4.70 LP2951C 25°C Decreasing Increasing
Figure Line Transient Response
25°C TIME (µs)
INPUT VOLTAGE
Vout
4.74
4.78
4.82
4.86
4.90
Vin, INPUT VOLTAGE
Figure LP2951 Enable Transient
SHUTDOWN OUTPUT VOLTAGE Shutdown Input -1.0 -100 25°C Vout LOAD CURRENT (mA)
Figure Load Transient Response
Vout 25°C ILoad TIME (ms) Vout
TIME (µs)
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
Figure Ripple Rejection
VOLTAGE NOISE
Figure Output Noise
25°C LP2951C
RIPPLE REJECTION (dB)
25°C Vout
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure Shutdown Threshold Voltage versus Temperature
SHUTDOWN THRESHOLD VOLTAGE Output "Off" Output "On" Vout OUTPUT CURRENT (mA) LP2951CN
Figure Maximum Rated Output Current
25°C 75°C OUTPUT VOLTAGE CHANGE (mV)
TEMPERATURE (°C)
Vin, INPUT VOLTAGE
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
APPLICATIONS INFORMATION Introduction LP2950/LP2951 regulators designed with internal current limiting thermal shutdown making them user-friendly. Typical application circuits LP2950 LP2951 shown Figures through These regulators internally compensated thus require greater) capacitance between LP2950/LP2951 output terminal ground stability. Most types aluminum, tantalum multilayer ceramic will perform adequately. Solid tantalums appropriate multilayer ceramic capacitors recommended operation below 25°C. lower values output current, less output capacitance required output stability. capacitor reduced 0.33 currents less than currents below Using 8-pin versions voltages less than operates error amplifier lower values gain, that more output capacitance needed stability. worst case operating condition load 1.23 output (Output connected feedback minimum capacitance recommended. LP2950 will remain stable regulation when operated with output load. When setting output voltage LP2951 with external resistors, resistance values should chosen draw minimum bypass capacitor recommended across LP2950/LP2951 input ground more than inches wire connects input either battery power supply filter capacitor. Input capacitance LP2951 Feedback create pole, causing instability high value external resistors used output voltage. Adding capacitor between Output Feedback increasing output filter capacitor least will stabilize feedback loop. Error Detection Comparator comparator switches positive logic whenever LP2951 output voltage falls more than approximately 5.0% regulation. This value comparator's designed-in offset voltage divided 1.235 internal reference. shown representative block diagram. This trip level remains 5.0% below normal regardless value regulated output voltage. example, error flag trip level 4.75 normal regulated output, 9.50 output voltage. Figure timing diagram which shows ERROR signal regulated output voltage input voltage LP2951 ramped down. ERROR signal becomes valid (low) about input. goes high when input reaches about (Vout exceeds about 4.75 Since LP2951's dropout voltage dependent upon load current (refer curve Typical Performance Characteristics), input voltage trip point will vary with load current. output voltage trip point does vary with load. error comparator output open collector which requires external pull-up resistor. This resistor returned output some other voltage within system. resistance value should chosen consistent with sink capability error comparator. value between suggested. pull-up resistance required this output unused. When operated shutdown mode, comparator output will high been pulled external supply. avoid this invalid response, comparator output should pulled Vout Figure 15). Figure ERROR Output Timing
Output Voltage 4.75 4.70
error error (see
ERROR
Valid
Valid
Pull-Up Pull-Up Vout
4.75 Vdropout Input Voltage
4.70 Vdropout
Programming Output Voltage (LP2951) LP2951CX pin-strapped using internal voltage divider tying (output) (sense) (feedback) (5.0 tap). Alternatively, programmed output voltage between 1.235 reference voltage maximum rating. external pair resistors required, shown Figure Figure Adjustable Regulator
Error Output Error
Vout
0.01 Vout 1.23
Shutdown Input
complete equation output voltage
Vref
where Vref nominal 1.235 reference voltage feedback bias current, nominally minimum recommended load current forces upper limit value regulator must work with load. will produce typical error Vout which eliminated room temperature adjusting better accuracy, choosing reduces this MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
error 0.17% while increasing resistor program current Since LP2951 typically draws load with open circuited, extra current drawn often worthwhile tradeoff eliminating need output voltage test. Output Noise many applications desirable reduce noise present output. Reducing regulator bandwidth increasing size output capacitor only method reducing noise lead LP2950. However, increasing capacitor from only decreases noise from µVrms bandwidth output. Noise reduced fourfold bypass capacitor across since reduces high frequency gain from unity. Pick Bypass Figure Regulator with Dropout
Unregulated Input MTB23P06E 0.01 Vout ±1.0% Vout
Error Output
Error
LP2951CN Shutdown Input
2pR1
0.002
about 0.01 When doing this, output capacitor must increased maintain stability. These changes reduce output noise from µVrms bandwidth output. With bypass capacitor added, noise longer scales with output voltage that improvements more dramatic higher output voltages.
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
TYPICAL APPLICATIONS
Figure Lithium Battery Cell Charger Figure Drift Current Sink
Unregulated Input 0.025 1.0% 1.0% Error Vout Load 1.23/R
Error
Vout
1N4001
LP2951CN
Error Output Lithium Rechargeable Cell
Shutdown Input
LP2951CN
Figure Latch When Error Flag Occurs
+Vin
Figure Regulator with Sleep Function
+Vin *Sleep Input
CMOS Gate
2N3906 Reset Normally Closed Error
Vout
Vout
Error Output Error
Vout 2N3906 Vout
LP2951CN
LP2951CN Shutdown Input
Error flag occurs when maintain Vout, Vout reduced excessive load current.
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
Figure Regulator with Early Warning Auxiliary Output
+Vin Error
Vout
Memory NiCad
LP2951CN
Early Warning Reset
diodes 1N4148. Early Warning flag input voltage. Main output latches lower input voltages. Battery backup auxiliary output.
2N3906
Error
Vout
Main Output
LP2951CN
Operation: Regulator #1's Vout programmed diode drop above error flag becomes active when When drops below error flag regulator becomes active latches main output "off". When again exceeds regulator back regulation early warning signal rises, unlatching regulator
Figure Dropout Regulator
Current Limit Section 2N3906 2N3906 MJE2955 Error Flag Error +Vin
0.05
1000
Vout
Tant Vout
LP2951CN
0.033
Vout 1.25V (1.0 R1/R2) output, internal resistors. Wire wire +Vout Bus.
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
Figure Open Circuit Detector Current Loop
Output* Error
Vout
LP2951CN 1N4001
High
1N457 1N457 1N457
Figure Battery Disconnect
31.6 2N3906 Error
Lead-Acid Battery
MC34164P-5
Vout
Main Memory
LP2951CN
NiCad Backup Battery
Figure DPAK Thermal Resistance Maximum Power Dissipation versus P.C.B. Copper Length
Free Mounted Vertically Minimum Size PD(max) 50°C Copper MAXIMUM POWER DISSIPATION THERMAL RESISTANCE JUNCTION-TO-AIR (°C/W) LENGTH COPPER (mm)
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
OUTLINE DIMENSIONS
SUFFIX PLASTIC PACKAGE CASE 29-04 (TO-226AA/TO-92) ISSUE
SEATING PLANE
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: INCH. CONTOUR PACKAGE BEYOND DIMENSION UNCONTROLLED. DIMENSION APPLIES BETWEEN DIMENSION APPLY BETWEEN MINIMUM. LEAD DIMENSION UNCONTROLLED BEYOND DIMENSION MINIMUM. INCHES 0.175 0.205 0.170 0.210 0.125 0.165 0.016 0.022 0.016 0.019 0.045 0.055 0.095 0.105 0.015 0.020 0.500 0.250 0.080 0.105 0.100 0.115 0.135 MILLIMETERS 4.45 5.20 4.32 5.33 3.18 4.19 0.41 0.55 0.41 0.48 1.15 1.39 2.42 2.66 0.39 0.50 12.70 6.35 2.04 2.66 2.54 2.93 3.43
SECTION
SUFFIX PLASTIC PACKAGE CASE 369A-13 (DPAK) ISSUE
SEATING PLANE NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: INCH. INCHES 0.235 0.250 0.250 0.265 0.086 0.094 0.027 0.035 0.033 0.040 0.037 0.047 0.180 0.034 0.040 0.018 0.023 0.102 0.114 0.090 0.175 0.215 0.020 0.050 0.020 0.030 0.050 0.138 MILLIMETERS 5.97 6.35 6.35 6.73 2.19 2.38 0.69 0.88 0.84 1.01 0.94 1.19 4.58 0.87 1.01 0.46 0.58 2.60 2.89 2.29 4.45 5.46 0.51 1.27 0.51 0.77 1.27 3.51
0.13 (0.005)
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
OUTLINE DIMENSIONS
SUFFIX PLASTIC PACKAGE CASE 626-05 ISSUE
NOTES: DIMENSION CENTER LEAD WHEN FORMED PARALLEL. PACKAGE CONTOUR OPTIONAL (ROUND SQUARE CORNERS). DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. MILLIMETERS 9.40 10.16 6.60 6.10 4.45 3.94 0.51 0.38 1.78 1.02 2.54 1.27 0.76 0.30 0.20 3.43 2.92 7.62 0.76 1.01 INCHES 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 0.030 0.050 0.008 0.012 0.115 0.135 0.300 0.030 0.040
NOTE
SEATING PLANE
0.13 (0.005)
SUFFIX PLASTIC PACKAGE CASE 751-05 (SO-8) ISSUE
NOTES: DIMENSIONING TOLERANCING ASME Y14.5M, 1994. DIMENSIONS MILLIMETERS. DIMENSION INCLUDE MOLD PROTRUSION. MAXIMUM MOLD PROTRUSION 0.15 SIDE. DIMENSION DOES INCLUDE MOLD PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL 0.127 TOTAL EXCESS DIMENSION MAXIMUM MATERIAL CONDITION. MILLIMETERS 1.35 1.75 0.10 0.25 0.35 0.49 0.18 0.25 4.80 5.00 3.80 4.00 1.27 5.80 6.20 0.25 0.50 0.40 1.25
0.25
SEATING PLANE
0.10 0.25
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
OUTLINE DIMENSIONS
SUFFIX PLASTIC PACKAGE CASE 846A-02 (Micro-8) ISSUE
NOTES: DIMENSIONING TOLERANCING ANSI Y14.5M, 1982. CONTROLLING DIMENSION: MILLIMETER. DIMENSION DOES INCLUDE MOLD FLASH, PROTRUSIONS GATE BURRS. MOLD FLASH, PROTRUSIONS GATE BURRS SHALL EXCEED 0.15 (0.006) SIDE. DIMENSION DOES INCLUDE INTERLEAD FLASH PROTRUSION. INTERLEAD FLASH PROTRUSION SHALL EXCEED 0.25 (0.010) SIDE. MILLIMETERS 2.90 3.10 2.90 3.10 1.10 0.25 0.40 0.65 0.05 0.15 0.13 0.23 4.75 5.05 0.40 0.70 INCHES 0.114 0.122 0.114 0.122 0.043 0.010 0.016 0.026 0.002 0.006 0.005 0.009 0.187 0.199 0.016 0.028
0.08 (0.003)
SEATING PLANE
0.038 (0.0015)
MOTOROLA ANALOG DEVICE DATA
LP2950 LP2951
Motorola reserves right make changes without further notice products herein. Motorola makes warranty, representation guarantee regarding suitability products particular purpose, does Motorola assume liability arising application product circuit, specifically disclaims liability, including without limitation consequential incidental damages. "Typical" parameters which provided Motorola data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. Motorola does convey license under patent rights rights others. Motorola products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure Motorola product could create situation where personal injury death occur. Should Buyer purchase Motorola products such unintended unauthorized application, Buyer shall indemnify hold Motorola officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that Motorola negligent regarding design manufacture part. Motorola registered trademarks Motorola, Inc. Motorola, Inc. Equal Opportunity/Affirmative Action Employer. reach EUROPE Locations Listed: Motorola Literature Distribution; P.O. 20912; Phoenix, Arizona 85036. 1-800-441-2447 602-303-5454 MFAX: RMFAX0@email.sps.mot.com TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com
JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-81-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Ping Industrial Park, Ting Road, N.T., Hong Kong. 852-26629298
MOTOROLA ANALOG DEVICE DATA
*LP2950/D*
LP2950/D
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