LM7705 NSC | Alldatasheet
Document overview
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Technical content
Features
■ Regulated output voltage −0.232V ■ Output voltage tolerance 5% ■ Output voltage ripple 4 mVPP ■ Max output current 26 mA ■ Supply voltage 3V to 5.25V ■ Conversion efficiency up to 98% ■ Quiescent current 78 µA ■ Shutdown current 20 nA ■ Turn on time 500 µs ■ Operating temperature range −40°C to 125°C ■ 8-Pin MSOP Package
Applications
■ True zero amplifier output ■ Portable instrumentation ■ Low voltage split power supplies Typical Application 20173001 © 2009 National Semiconductor Corporation 201730 www.national.com LM7705 Low Noise Negative Bias Generator
Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage VDD - VSS +5.75V SD VDD+0.3V, VSS-0.3V ESD Tolerance (Note 2) Human Body Model For input pins only 2000V For all other pins 2000V Machine Model 200V Charge Device Model 750V Storage Temp. Range −65°C to 150°C Junction Temperature (Note 7) 150°C max Mounting Temperature Infrared or Convection (20 sec) 260°C Operating Ratings Supply Voltage ( VDD to GND) 3V to 5.25V Supply Voltage ( VDD wrt VOUT) 3.23V to 5.48V Temperature Range −40°C to 125°C Thermal Resistance (θJA ) 8-Pin MSOP 253°C/W 3.3V Electrical Characteristics Unless otherwise specified, all limits are guaranteed for TA = 25°C, VDD = 3.3V, VSS = 0V, SD = 0V, CFLY= 5 µF, CRES = 22 µF, COUT = 22 µF. Boldface limits apply at temperature extremes (Note 5). Symbol Parameter Conditions Min (Note 6) Typical (Note 7) Max (Note 6) Units VOUT Output Voltage IOUT = 0 mA −0.242 −0.251 −0.232 −0.219 −0.209 VIOUT = −20 mA −0.242 −0.251 −0.226 −0.219 −0.209 VR Output Voltage Ripple IOUT = −20 mA 4 mVPP IS Supply Current No Load 50 78 100 150 μA ISD Shutdown Supply Current SD = VDD 20 nA ηPOWER Current Conversion Efficiency −5 mA ≤ IOUT ≤ −20 mA 98 % ηPOWER Current Conversion Efficiency IOUT = −5 mA 98 % tON Turn On Time IOUT = −5 mA 500 μs t OFF Turn Off Time IOUT = −5 mA 700 μs tOFF CP Turn Off Time Charge Pump IOUT = −5 mA 11 μs ZOUT Output Impedance −1 mA ≤ IOUT ≤ −20 mA 0.23 0.8 1.3 Ω IO_MAX Maximum Output Current VOUT < −200 mV -26 mA fOSC Oscillator Frequency 92 kHz VIL Shutdown Input Low 1.6 1.25 V VIH Shutdown Input High 1.85 2.15 V IC Shutdown Pin Input Current SD = VDD 50 pA Load Regulation 0 mA ≤ IOUT ≤ −20 mA 0.12 0.6 0.85 %/mA Line Regulation 3V ≤ VDD ≤ 5.25V (No Load) -0.2 0.29 0.7 1.1 %/V www.national.com 2 LM7705
5.0V Electrical Characteristics Unless otherwise specified, all limits are guaranteed for TA = 25°C, VDD = 5.0V, VSS = 0V, SD = 0V, CFLY = 5 µF, CRES = 22 µF, COUT = 22 µF. Boldfacelimits apply at temperature extremes (Note 5). Symbol Parameter Conditions Min (Note 6) Typical (Note 7) Max (Note 6) Units VOUT Output Voltage IOUT = 0 mA −0.242 −0.251 −0.233 −0.219 −0.209 VIOUT = −20 mA −0.242 −0.251 −0.226 −0.219 −0.209 VR Output Voltage Ripple IOUT = −20 mA 4 mVPP IS Supply Current No Load 60 103 135 240 μA ISD Shutdown Supply Current SD = VDD 20 nA ηPOWER Current Conversion Efficiency −5 mA ≤ IOUT ≤ −20 mA 98 % ηPOWER Current Conversion Efficiency IOUT = −5 mA 98 % tON Turn On Time IOUT = −5 mA 200 μs t OFF Turn Off Time IOUT = −5 mA 700 μs tOFF CP Turn Off Time Charge Pump IOUT = −5 mA 11 μs ZOUT Output Impedance −1 mA ≤ IOUT ≤ −20 mA 0.26 0.8 1.3 Ω IO_MAX Maximum Output Current VOUT < − 200 mV −35 mA fOSC Oscillator Frequency 91 kHz VIL Shutdown Input Low 2.55 1.95 V VIH Shutdown Input High 2.8 3.25 V IC Shutdown Pin Input Current SD = VDD 50 pA Load Regulation 0 mA ≤ IOUT ≤ −20 mA 0.14 0.6 0.85 %/mA Line Regulation 3V ≤ VDD ≤ 5.25V (No Load) −0.2 0.29 0.7 1.1 %/V 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 specific performance is not guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine model, applicable std JESD22–A115–A (ESSD MM srd of JEDEC). Field induced Charge-Device Model, applicable std. JESD22–C101–C. (ESD FICDM std of JEDEC). Note 3: The maximum power dissipation is a function of TJ(MAX), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/ θJA. All numbers apply for packages soldered directly onto a PC board. Note 4: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ > TA. Note 5: Boldface limits apply to temperature range of −40°C to 125°C Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material. 3 www.national.com LM7705
Pin Number Symbol Description
1 CF+ CFLY Positive Capacitor Connection
2 VSS Power Ground
3 SD Shutdown Pin
If SD pin is LOW, device is ON If SD pin is HIGH, device is OFF
4 VDD Positive Supply Voltage
5 VSS Power Ground
6 VOUT Output Voltage
7 CRES Reserve Capacitor Connection
8 CF- CFLY Negative Capacitor Connection
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing 8-Pin MSOP LM7705MM F26A 1k Units Tape and Reel MUA08ALM7705MME 250 Units Tape and Reel LM7705MMX 3.5k Units Tape and Reel Block Diagram 20173003 LM7705 www.national.com 4 LM7705
Typical Performance Characteristics VDD = 3.3V and TA = 25°C unless otherwise noted. Output Voltage vs. Supply Voltage 20173010 Supply Current vs. Supply Voltage 20173011 Output Voltage vs. Output Current 20173012 Output Voltage vs. Output Current 20173013 Output Voltage Ripple vs. Temperature 20173014 Output Voltage Ripple vs. Temperature 20173015 5 www.national.com LM7705
Supply Current vs. Output Current 20173016 Supply Current vs. Output Current 20173017 Current Conversion Efficiency vs. Output Current 20173018 Current Conversion Efficiency vs. Output Current 20173019 Turn On Time 20173020 Turn On Time 20173021 www.national.com 6 LM7705
Load Regulation vs. Temperature 20173022 Load Regulation vs. Temperature 20173023 Transient Response 20173024 Transient Response 20173025 Transient Response 20173029 Transient Response 20173030 7 www.national.com LM7705
Output voltage vs. shutdown Voltage 20173026 Supply Current vs. Shutdown Voltage 20173027 Oscillator Frequency vs. Temperature 20173028 www.national.com 8 LM7705
Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin MSOP www.national.com 14 LM7705
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