Datasheet

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SOT-23-5

LM8261

www.ti.com

SNOS469I –APRIL 2000–REVISED MARCH 2013

LM8261 Single RRIO, High Output Current & Unlimited Cap Load Op Amp in SOT-23-5

Check for Samples: LM8261

FEATURES

DESCRIPTION

The LM8261 is a Rail-to-Rail input and output Op

= 5V, T

= 25°C, Typical Values Unless

Amp which can operate with a wide supply voltage

Specified).

range. This device has high output current drive,

• GBWP 21MHz

greater than Rail-to-Rail input common mode voltage

• Wide Supply Voltage Range 2.5V to 30V

range, unlimited capacitive load drive capability, and

provides tested and guaranteed high speed and slew

• Slew Rate 12V/µs

rate while requiring only 0.97mA supply current. It is

• Supply Current 0.97 mA

specifically designed to handle the requirements of

• Cap Load Limit Unlimited

flat panel TFT panel V

COM

driver applications as well

as being suitable for other low power, and medium

• Output Short Circuit Current +53mA/−75mA

speed applications which require ease of use and

• ±5% Settling Time 400ns (500pF, 100mV

enhanced performance over existing devices.

step)

Greater than Rail-to-Rail input common mode voltage

• Input common mode voltage 0.3V beyond rails

range with 50dB of Common Mode Rejection, allows

• Input voltage noise 15nV/√Hz

high side and low side sensing, among many

• Input current noise 1pA/√Hz

applications, without having any concerns over

exceeding the range and no compromise in accuracy.

• THD+N < 0.05%

Exceptionally wide operating supply voltage range of

2.5V to 30V alleviates any concerns over functionality

APPLICATIONS

under extreme conditions and offers flexibility of use

• TFT-LCD flat panel V

COM

driver

in multitude of applications. In addition, most device

parameters are insensitive to power supply variations;

• A/D converter buffer

this design enhancement is yet another step in

• High side/low side sensing

simplifying its usage. The output stage has low

• Headphone amplifier

distortion (0.05% THD+N) and can supply a

respectable amount of current (15mA) with minimal

headroom from either rail (300mV).

The LM8261 is offered in the space saving SOT-23-5

package.

Figure 1. Output Response with Figure 2. SOT-23-5

Heavy Capacitive Load Top View

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (29 pages)

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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 LM8261 Single RRIO, High Output Current & Unlimited Cap Load Op Amp in SOT-23-5 Check for Samples: LM8261 FEATURES 1 (VS = 5V, TA = 25°C, Typical Values Unless Specified). 2 • • • • • • • • • • • GBWP 21MHz Wide Supply Voltage Range 2.5V to 30V Slew Rate 12V/µs Supply Current 0.97 mA Cap Load Limit Unlimited Output Short Circuit Current +53mA/−75mA ±5% Settling Time 400ns (500pF, 100mVPP step) Input common mode voltage 0.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) Human Body Model (2) ESD Tolerance 2KV Machine Model (3) 200V VIN Differential +/−10V See (4) (5) Output Short Circuit Duration Supply Voltage (V+ - V−) 32V V+ +0.8V, V− −0.1V Voltage at Input/Output pins −65°C to +150°C Storage Temperature Range Junction Temperature (6) Soldering Information: (1) (2) (3) (4) (5) (6) +150°C Infrared or Convection (20 sec.) 235°C Wave Soldering (10 sec.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 2.7V ELECTRICAL CHARACTERISTICS Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 2.7V, V− = 0V, VCM = 0.5V, VO = V+/2, and RL > 1MΩ to V−. Boldface limits apply at the temperature extremes. (1) Symbol Parameter Condition Typ (2) Limit (3) Units +/−0.7 +/−5 +/−7 mV max µV/C VOS Input Offset Voltage VCM = 0.5V & VCM = 2.2V TC VOS Input Offset Average Drift VCM = 0.5V & VCM = 2.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com 2.7V ELECTRICAL CHARACTERISTICS (continued) Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 2.7V, V− = 0V, VCM = 0.5V, VO = V+/2, and RL > 1MΩ to V−. Boldface limits apply at the temperature extremes.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 5V ELECTRICAL CHARACTERISTICS(1) (continued) Unless otherwise specified, all limited guaranteed for TA = 25°C, V+ = 5V, V− = 0V, VCM = 1V, VO = V+/2, and RL > 1MΩ to V−. Boldface limits apply at the temperature extremes. Symbol Parameter (8) Condition Limit (3) Units 12 10 7 V/µs min 10.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com ±15V ELECTRICAL CHARACTERISTICS(1) (continued) Unless otherwise specified, all limited guaranteed for TA = 25°C, V+ = 15V, V− = −15V, VCM = 0V, VO = 0V, and RL > 1MΩ to 0V. Boldface limits apply at the temperature extremes. Symbol VO Output Swing High Output Swing Low ISC Typ (2) Limit (3) RL = 10KΩ 14.83 14.65 14.61 RL = 2KΩ 14.73 14.60 14.55 RL = 10KΩ −14.91 −14.75 −14.65 RL = 2KΩ −14.83 −14.65 −14.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, Unless Otherwise Noted VOS vs. VCM for 3 Representative Units VOS vs. VCM for 3 Representative Units Figure 3. Figure 4. VOS vs. VCM for 3 Representative Units VOS vs. VS for 3 Representative Units Figure 5. Figure 6. VOS vs. VS for 3 Representative Units VOS vs. VS for 3 Representative Units Figure 7. Figure 8.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = 25°C, Unless Otherwise Noted 8 IB vs. VCM IB vs. VS Figure 9. Figure 10. IS vs. VCM IS vs. VCM Figure 11. Figure 12. IS vs. VCM IS vs. VS (PNP side) Figure 13. Figure 14.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = 25°C, Unless Otherwise Noted IS vs. VS (NPN side) Gain/Phase vs. Frequency Figure 15. Figure 16. Unity Gain Frequency vs. VS Phase Margin vs. VS Figure 17. Figure 18. Unity Gain Freq. and Phase Margin vs. VS Unity Gain Frequency vs. Load Figure 19. Figure 20.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = 25°C, Unless Otherwise Noted 10 Phase Margin vs. Load Unity Gain Freq. and Phase Margin vs. CL Figure 21. Figure 22. CMRR vs. Frequency +PSRR vs. Frequency Figure 23. Figure 24. −PSRR vs. Frequency Output Voltage vs. Output Sourcing Current Figure 25. Figure 26.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = 25°C, Unless Otherwise Noted Output Voltage vs. Output Sourcing Current Output Voltage vs. Output Sinking Current Figure 27. Figure 28. Max Output Swing vs. Load Max Output Swing vs. Frequency Figure 29. Figure 30. % Overshoot vs. Cap Load ±5% Settling Time vs. Cap Load Figure 31. Figure 32.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = 25°C, Unless Otherwise Noted 12 +SR vs. Cap Load −SR vs. Cap Load Figure 33. Figure 34. +SR vs. Cap Load −SR vs. Cap Load Figure 35. Figure 36. Settling Time vs. Error Voltage Settling Time vs. Error Voltage Figure 37. Figure 38.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = 25°C, Unless Otherwise Noted Input Noise Voltage/Current vs. Frequency Input Noise Voltage for Various VCM Figure 39. Figure 40. Input Noise Current for Various VCM Input Noise Voltage vs. VCM Figure 41. Figure 42. Input Noise Current vs. VCM THD+N vs. Frequency Figure 43. Figure 44.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = 25°C, Unless Otherwise Noted 14 THD+N vs. Frequency THD+N vs. Frequency Figure 45. Figure 46. THD+N vs. Amplitude THD+N vs. Amplitude Figure 47. Figure 48. Small Signal Step Response Large Signal Step Response Figure 49. Figure 50.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 APPLICATION HINTS BLOCK DIAGRAM AND OPERATIONAL DESCRIPTION A) Input Stage Figure 51. Simplified Schematic Diagram As can be seen from the simplified schematic in Figure 51, the input stage consists of two distinct differential pairs (Q1-Q2 and Q3-Q4) in order to accommodate the full Rail-to-Rail input common mode voltage range.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com Figure 52. Input Stage Current vs. Differential Input Voltage B) Output Stage The output stage Figure 51 is comprised of complementary NPN and PNP common-emitter stages to permit voltage swing to within a VCE(SAT) of either supply rail. Q9 supplies the sourcing and Q10 supplies the sinking current load.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 For the LM8261, the available output current increases with the input overdrive. Referring to Figure 53 and Figure 54, Output Short Circuit Current vs. Input Overdrive, it can be seen that both sourcing and sinking short circuit current increase as input overdrive increases.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com Figure 55. Buffer Amplifier scope photo ESTIMATING THE OUTPUT VOLTAGE SWING It is important to keep in mind that the steady state output current will be less than the current available when there is an input overdrive present. For steady state conditions, the Output Voltage vs. Output Current plot ( TYPICAL PERFORMANCE CHARACTERISTICS section) can be used to predict the output swing.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 Figure 57. Output Sinking Characteristics with Load Lines TFT APPLICATIONS Figure 58 below, shows a typical application where the LM8261 is used as a buffer amplifier for the VCOM signal employed in a TFT LCD flat panel: Figure 58. VCOM Driver Application Schematic Figure 59 shows the time domain response of the amplifier when used as a VCOM buffer/driver with VREF at ground.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com Figure 59. VCOM driver performance scope photo OUTPUT SHORT CIRCUIT CURRENT AND DISSIPATION ISSUES The LM8261 output stage is designed for maximum output current capability.
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LM8261 www.ti.com SNOS469I – APRIL 2000 – REVISED MARCH 2013 The table entries are normalized to VS2/ RL. To figure out the AC load current component of power dissipation, simply multiply the table entry corresponding to the output waveform by the factor VS2/ RL. For example, with ±15V supplies, a 600Ω load, and triangular waveform power dissipation in the output stage is calculated as: PAC= (46.9 x 10−3) · [302/600]= 70.
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LM8261 SNOS469I – APRIL 2000 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision H (March 2013) to Revision I • 22 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) LM8261M5 SOT-23 DBV 5 1000 178.0 8.4 LM8261M5X SOT-23 DBV 5 3000 178.0 8.4 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM8261M5 SOT-23 DBV 5 1000 210.0 185.0 35.0 LM8261M5X SOT-23 DBV 5 3000 210.0 185.0 35.
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