LP2951 Adjustable Micro-Power Voltage Regulator Features Description • • • • • • • • • The LP2951 is an adjustable micro-power voltage regulator suitable for battery-powered systems. This regulator has various functions such as alarm that warns of a low output voltage often due to falling batteries on the input, the external shutdown enables the regulator to be switched on and off, current and temperature limiting. Adjustable or Fixed 5 V Output Voltage Low Quiescent Current Low Dropout Voltage Low Temperature Coefficient Tight Line and Load Regulation Guaranteed 100 mA Output Current Internal Short Current and Thermal Limit Error Signals of Output Dropout External Shut Down 8-SOIC 1 Applications • Automotive Electronics • Voltage Reference Ordering Information Part Number Operating Temperature Range Top Mark Package Packing Method LP2951CM LP2951CMX -40°C to +125°C -40°C to +125°C LP2951CM LP2951CM SOIC 8L SOIC 8L Rail Tape and Reel Block Diagram 5V [3] 1.26V Figure 1. Block Diagram © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 www.fairchildsemi.com LP2951 — Adjustable Micro-Power Voltage Regulator August 2014 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted. Symbol VIN PD RθJA TSTG TOPR Parameter Input Supply Voltage Power Dissipation Thermal Resistance Junction-to-Air Storage Temperature Range Operating Junction Temperature Range Value Unit -0.3 to 30.0 Internally Limited 127.5 -65 to 150 -40 to 125 V W °C/W °C °C Electrical Characteristics FEEDBACK (Pin 7) tied to TAP (Pin 6), VOUT (Pin 1) tied to PROGRAM (Pin 2). Values are at TA = 25°C, unless otherwise specified. Symbol Parameter VOUT Fixed Output Voltage ALL VOLTAGE OPTIONS Output Voltage Temperature ΔV/ΔT Coefficient(1) ΔV Line Regulation(2) ΔV Load Regulation VD Dropout Voltage IG Ground Current ICL Current Limit VREF (2) Reference Voltage Feedback Bias Current IFB ERROR COMPARATOR Output Low Voltage VOL High Threshold Voltage(4) VTH Low Threshold Voltage(4) VTL Hysteresis(4) VHYS SHUTDOWN INPUT Shutdown Threshold Range VSD ISD Shutdown Input Current Conditions IL = 50 mA Min. Typ. Max. Unit 4.9 5.0 5.1 V 50 (VO + 1) V ≤ VIN ≤ 28 V, IL = 50 mA 100 μA ≤ IL ≤ 100 mA IL = 100 μA IL = 100 mA IL = 100 μA IL = 100 mA VO = 0 V VIN = (VO + 1) V, IL = 100 μA (3) 110 1.235 1.225 VIN = (VO - 0.5) V, IOL = 400 μA 25 (5) 0.6 VSD = 2.4 V VSD = 28 V 165 1.260 1.260 20 ppm/°C 0.4 % 0.3 150 600 140 7 220 1.285 1.295 % mV μA mA mA V nA 150 60 75 15 400 1.3 30 450 2.0 100 750 140 mV mV mV mV V μA Notes: 1. Output or reference voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. 3. VREF ≤ VOUT ≤ (VIN - 1 V), 2.5 V ≤ VIN ≤ 28 V, 100 μA ≤ IL ≤ 100 mA, TA ≤ TAMAX. 4. Threshold and hysteresis are expressed in terms of voltage differential at the feedback terminal below the normal reference. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VO / VREF = (R1 + R2) / R2. 5. Vshutdown ≤ 0.6 V, VOUT = ON, Vshutdown ≥ 2.0 V, VOUT = OFF. © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 www.fairchildsemi.com 2 LP2951 — Adjustable Micro-Power Voltage Regulator Absolute Maximum Ratings 6 2.0 OUTPUT VOLTAGE(V) GROUND CURRENT(mA) 5 5V OUTPUT 1.6 1.2 0.8 0.4 RL=50Ω 3 2 1 0 0.1 1 10 100 0 1 2 4 5 6 Figure 3. Dropout Characteristics Figure 2. Quiescent Current 120 250 RL=50Ω 5V OUTPUT 100 200 RL=50K INPUT CURRENT(mA) INPUT CURRENT(uA) 3 INP UT VO L T AG E (V) LOAD CURRENT(mA) 150 100 RL=∞ 50 80 60 40 20 0 0 0 2 4 6 8 10 0 2 4 8 10 Figure 5. Input Current Figure 4. Input Current 5.06 200 5V OUTPUT SHORT CIRCUIT CURRENT(mA) 5.04 6 INPUT VOL TAGE(V ) INPUT VOLTAGE(V) OUTPUT VOLTAGE(V) RL=50KΩ 4 5.02 5.00 4.98 4.96 180 160 140 120 4.94 -50 -25 0 25 50 75 100 100 -5 0 125 TEMPERATURE(oC) 0 25 50 75 100 125 o T E M P E R A T UR E ( C ) Figure 6. Output Voltage vs. Temperature © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 -2 5 Figure 7. Short-Circuit Current www.fairchildsemi.com 3 LP2951 — Adjustable Micro-Power Voltage Regulator Typical Performance Characteristics 600 500 IL = 100mA DROPOUT VOLTAGE(mV) DROPOUT VOLTAGE(V) 500 400 300 200 IL = 100P A 100 0 -50 -25 0 25 50 75 100 300 200 o TJ = 25 C 100 0 0.1 125 TEMPERATURE(oC) 1 10 100 OUTPUT CURRENT(mA) Figure 8. Dropout Voltage © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 400 Figure 9. Dropout Voltage www.fairchildsemi.com 4 LP2951 — Adjustable Micro-Power Voltage Regulator Typical Performance Characteristics (Continued) LP2951 — Adjustable Micro-Power Voltage Regulator Typical Application VIN 8 VIN ERROR SHUTDOWN 5 ERROR V 1 OUT KA78RLOOD LP2951 3 SD GND VOUT R1 FB Co(6) 1 μF 7 4 VREF R2 * Pin2 and Pin 6 are left open V O = VREF (1+ R1/ R2)+IFB R1 Figure 10. Adjustable Regulator VIN 8 VIN ERROR SHUTDOWN 5 ERROR V 1 OUT 2 LP2951 KA78RLOOD Program 3 TAP 6 SD FB GND VOUT (6) R1 Co 1 μF 7 4 VREF R2 Figure 11. Fixed Output 5 V Note: 6. CO is required between the output and ground for stability at output voltages of 5 V or more. Since IFB is controlled to less than 40 nA, the error associated with this term is negligible in most applications. At lower output voltage, more capacitance is required. without this capacitance the part oscillates. © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 www.fairchildsemi.com 5 Figure 12. Wide Input Voltage Range Current Limiter Figure 13. 5 V Regulator with 2.5 V Sleep Function Figure 14. Low Drift Current Source Figure 15. 5 V Current Limiter Figure 16. Latch Off When Error Flag Occurs Figure 17. Open Circuit Detector for 4 mA to 20 mA Current Loop © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 www.fairchildsemi.com 6 LP2951 — Adjustable Micro-Power Voltage Regulator Typical Application (Continued) LP2951 — Adjustable Micro-Power Voltage Regulator Typical Application (Continued) PROGRAM Figure 18. Low Battery Disconnect © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 www.fairchildsemi.com 7 LP2951 — Adjustable Micro-Power Voltage Regulator Physical Dimensions Figure 19. 8 Lead, SOIC, JEDEC MS-012, 0.150 inch NARROW BODY Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/dwg/M0/M08A.pdf. For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area: http://www.fairchildsemi.com/packing_dwg/PKG-M08A.pdf. © 2002 Fairchild Semiconductor Corporation LP2951 Rev. 1.1.1 www.fairchildsemi.com 8 TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not intended to be an exhaustive list of all such trademarks. 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