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SEL

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LPV531

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SNOSAK5B –MARCH 2006–REVISED MARCH 2013

LPV531 Programmable Micropower CMOS Input, Rail-to-Rail Output Operational Amplifier

Check for Samples: LPV531

FEATURES

DESCRIPTION

• (Typical 5V Supply, unless otherwise Noted.)

The LPV531 is an extremely versatile operational

• Supply Voltage 2.7V to 5.5V

amplifier. A single external resistor gives the system

designer the ability to define the quiescent current,

• Dynamic Power Mode Setting

gain bandwidth product and output short circuit

• Continuously Programmable Supply Current

current. This innovative feature gives the system

– Range 5 μA to 425 μA

designer a method to dynamically switch the power

• Continuously Programmable Bandwidth

level to optimize the performance of the op amp and

meet the system design requirements.

– Range 73 kHz to 4.6 MHz

The LPV531 can be tailored to a wide variety of

• Input Common Mode Voltage Range −0.3V to

applications. It offers the system designer the ability

3.8V

to dynamically trade off supply current for bandwidth

• CMRR 95 dB

by adjusting the current drawn from the I

SEL

pin using

• Rail-to-Rail Output Voltage Swing

a DAC or switching in different value resistors in

series with the I

SEL

pin. The LPV531 is capable of

• Input Offset Voltage 1 mV

operating from 73 kHz, consuming only 5 μA, to as

fast as 4.6 MHz, consuming only 425 μA. The input

APPLICATIONS

offset voltage is relatively independent and therefore

• AC Coupled Circuits

is not significantly affected by the chosen power level.

• Portable Instrumentation

Utilizing a CMOS input stage, the LPV531 achieves

• Active Filters

an input bias current of 50 fA and a common mode

input voltage which extends from the negative rail to

Typical Application

within 1.2V of the positive supply. The LPV531's rail-

to-rail class AB output stage enables this op amp to

offer maximum dynamic range at low supply voltage.

Offered in the space saving 6-pin SOT package, the

LPV531 is ideal for use in handheld electronics and

portable applications. The LPV531 is manufactured

using TI’s advanced VIP50 process.

A fixed supply current/gain bandwidth is available

upon request.

Figure 1. AC Coupled Application

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 (27 pages)

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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 LPV531 Programmable Micropower CMOS Input, Rail-to-Rail Output Operational Amplifier Check for Samples: LPV531 FEATURES 1 • • • • 2 • • • • • (Typical 5V Supply, unless otherwise Noted.) Supply Voltage 2.7V to 5.5V Dynamic Power Mode Setting Continuously Programmable Supply Current – Range 5 μA to 425 μA Continuously Programmable Bandwidth – Range 73 kHz to 4.6 MHz Input Common Mode Voltage Range −0.3V to 3.
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 www.ti.com 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.
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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 5V Full Power Mode Electrical Characteristics Unless otherwise specified, all limits are ensured for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2, ISEL pin connected to V−, RL = 100 kΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (1) Typ (2) VOS Input Offset Voltage ΔVOS Input Offset Voltage Difference TC VOS Input Offset Average Drift (3) ±2 IB Input Bias Current (4) .
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 www.ti.com 5V Mid-Power Mode Electrical Characteristics Unless otherwise specified, all limits are ensured for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2, ISEL pin connected to V− through 100 kΩ resistor, RL = 100 kΩ. Boldface limits apply at the temperature extremes.
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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 5V Low Power Mode Electrical Characteristics Unless otherwise specified, all limits are ensured for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2, ISEL connected to V− through 1 MΩ resistor, RL = 100 kΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (1) Typ (2) VOS Input Offset Voltage ΔVOS Input Offset Voltage Difference TC VOS Input Offset Average Drift (3) ±2 IB Input Bias Current (4) .
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 www.ti.com Power Select Electrical Characteristics Unless otherwise specified, all limits are ensured for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2, RL = 100 kΩ. Boldface limits apply at the temperature extremes.
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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 Typical Performance Characteristics Unless otherwise specified, V = 5V, TJ = 25°C. For Full Power Mode the ISEL pin is connected to V−; for Mid-Power Mode the ISEL pin is connected to V− through a 100 kΩ resistor; for Low Power Mode the ISEL pin is connected to V− through a 1 MΩ resistor. + Supply Current vs. ISEL Supply Current vs.
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, V = 5V, TJ = 25°C. For Full Power Mode the ISEL pin is connected to V−; for Mid-Power Mode the ISEL pin is connected to V− through a 100 kΩ resistor; for Low Power Mode the ISEL pin is connected to V− through a 1 MΩ resistor. + 120 Gain and Phase vs.
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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified, V = 5V, TJ = 25°C. For Full Power Mode the ISEL pin is connected to V−; for Mid-Power Mode the ISEL pin is connected to V− through a 100 kΩ resistor; for Low Power Mode the ISEL pin is connected to V− through a 1 MΩ resistor. + PSRR vs. Frequency (Full Power Mode) PSRR vs.
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, V = 5V, TJ = 25°C. For Full Power Mode the ISEL pin is connected to V−; for Mid-Power Mode the ISEL pin is connected to V− through a 100 kΩ resistor; for Low Power Mode the ISEL pin is connected to V− through a 1 MΩ resistor.
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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified, V = 5V, TJ = 25°C. For Full Power Mode the ISEL pin is connected to V−; for Mid-Power Mode the ISEL pin is connected to V− through a 100 kΩ resistor; for Low Power Mode the ISEL pin is connected to V− through a 1 MΩ resistor.
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, V = 5V, TJ = 25°C. For Full Power Mode the ISEL pin is connected to V−; for Mid-Power Mode the ISEL pin is connected to V− through a 100 kΩ resistor; for Low Power Mode the ISEL pin is connected to V− through a 1 MΩ resistor. + Input Referred Voltage Noise vs. Frequency Phase Margin vs.
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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 APPLICATION INFORMATION The LPV531 is an extremely versatile operational amplifier because performance and power consumption can be adjusted during operation. This provides a method to dynamically optimize the supply current, the bandwidth and the output short circuit current in the application. The power level can be set by the current drawn from the ISEL pin according to the application performance requirements.
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 IN www.ti.com 4 + + + 6 V VINT = 110 mV RINT = 11 k: IN 3 - 1 2 V OUT - 5 ISEL REXT Figure 36. Single Power Mode Switched Discrete Power Modes In this typical application, the LPV531 can operate at two (or more) power modes in order to fulfill the demands of the design. One of the modes is used to save power. It is a low power mode which is set by using a large resistor.
PAGE 15
LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 - + LPV531 IN - DAC + VOUT ISEL VCONTROL REXT2 REXT1 Figure 38. DAC Controlled Power Mode Configurations The output of the resistive voltage divider should have an impedance that is small compared to the value of RINT to allow a linear control of the power level. Therefore, REXT2 needs to have a value in the order of RINT/10 and REXT1 = 125 mV * REXT2 /VCONTROL,MAX.
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LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 RLOAD,MIN = 0.07 REXT + 11 k: or REXT = www.ti.com 0.07 RLOAD,MIN -11 k: (5) For the characterized power modes these equations lead to the minimum values in Table 2 below. Table 2. Minimum Values for Characterized Power Modes REXT ISEL ISC RLOAD 1Ω 9 µA 3 mA 770Ω 100 kΩ 0.9 µA 300 µA 7.8 kΩ 1 MΩ 99 nA 55 µA 70.8 kΩ The smallest load resistor that the LPV531 can drive when in low power mode is 70.8 kΩ, as shown in Table 2.
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LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 C1 R2 R1 VIN - R3 VOUT + +V C2 ISEL R4 REXT I/O PIN MICROCONTROLLER Figure 39. Inverting AC Coupled Application PROGRAMMABLE POWER LEVELS AND THE EFFECTS OF STABILITY COMPENSATION METHODS USING EXTERNAL COMPONENTS In some op amp application circuits, external capacitors are used to improve the stability of the feedback loop around the amplifier.
PAGE 18
LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 www.ti.com When the power setting of the LPV531 is reduced, both the transconductance of the input stage and the transconductance of the output stage will scale lineary with the power level to lower levels. This means that both the unity gain frequency and the pole to the transconductance of the output stage and the load capacitance will move down.
PAGE 19
LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 INPUT CAPACITANCE AND FEEDBACK CIRCUIT ELEMENTS The LPV531 has a very low input bias current (50 fA). To obtain this performance a large CMOS input stage is used, which adds to the input capacitance of the op amp, CIN.
PAGE 20
LPV531 SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 R1 < (1 - AV) www.ti.com 2 2A0AVCIN (8) In Figure 43, CF is added to compensate for input capacitance and to increase stability. In addition, CF reduce or eliminates the gain peaking that can be caused by having a larger feedback resistor.
PAGE 21
LPV531 www.ti.com SNOSAK5B – MARCH 2006 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision A (March 2013) to Revision B • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-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) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LPV531MK/NOPB SOT DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LPV531MKX/NOPB SOT DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LPV531MK/NOPB SOT DDC 6 1000 210.0 185.0 35.0 LPV531MKX/NOPB SOT DDC 6 3000 210.0 185.0 35.
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