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Texas Instruments LPV531MK/NOPB
- Part No.:
- LPV531MK/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LPV531MK/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,562
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Product details
Overview
LPV531MK/NOPB from Texas Instruments is a programmable micropower CMOS-input rail-to-rail output operational amplifier with dynamically adjustable supply current (5 μA to 425 μA), gain-bandwidth product (73 kHz to 4.6 MHz), and output short-circuit current - used in battery-powered instrumentation, AC-coupled signal chains, and low-power active filters.
For engineers reviewing the LPV531MK/NOPB datasheet, LPV531MK/NOPB pinout, LPV531MK/NOPB application, or LPV531MK/NOPB equivalent, this page delivers verified specifications, validated pin functions, confirmed power-mode behavior across temperature, real-world application constraints for REXT selection, and two technically documented alternative op-amps with quantified trade-offs.
Technical Context
The LPV531MK/NOPB implements a dual-bias-generator architecture: a fixed low-power reference (ISTDB) and a programmable current source (IPROG) derived from ISEL pin current via internal 11 kΩ resistor and 110 mV reference voltage. Power mode transitions occur within 210 ns (low→full) and 500 ns (full→low).
Its CMOS input stage delivers 50 fA typical input bias current and −0.3 V to 3.8 V input common-mode range (at 5 V supply); rail-to-rail Class AB output supports 30 mV from rails into 100 kΩ load. Stability is internally compensated - external capacitors may degrade phase margin depending on REXT-selected bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and dual-cell alkaline systems without LDO pre-regulation. |
| Programmable Supply Current | 5 μA to 425 μA - enables dynamic trade-off between battery life and signal fidelity in wake/sleep cycles. |
| Gain-Bandwidth Product | 73 kHz to 4.6 MHz - scales linearly with supply current; usable for DC–audio and low-speed sensor conditioning. |
| Input Offset Voltage | ±1 mV (typ) - stable across power modes; avoids recalibration when switching between low/full power. |
| Input Common-Mode Range | −0.3 V to 3.8 V at 5 V supply - allows direct sensing of signals near ground or above mid-supply in single-supply systems. |
| Rail-to-Rail Output Swing | 30 mV from V+ and 95 mV from V− into 100 kΩ - maximizes dynamic range in 3.3 V or lower supply applications. |
| CMRR | 95 dB (typ) - maintains accuracy in noisy industrial or portable environments with varying common-mode transients. |
Pinout & Package
LPV531MK/NOPB is housed in a 6-pin SOT-23 (DDC) package - footprint-compatible with industry-standard 2.9 mm × 1.6 mm SOT-23 layouts and suitable for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V− | Negative supply rail | Reference node for ISEL current sink and internal bias generator; must be connected directly to ground or negative rail. |
| 2 - IN+ | Non-inverting input | CMOS input with 50 fA bias current; accepts signals from −0.3 V to 3.8 V at 5 V supply. |
| 3 - IN− | Inverting input | Differential input node; matched to IN+ for <1 mV offset; sensitive to layout-induced coupling. |
| 4 - OUT | Amplifier output | Rail-to-rail Class AB stage; drives ≥100 kΩ loads in low-power mode; requires ≥70.8 kΩ minimum load below 60 kHz GBW. |
| 5 - ISEL | Power mode control | Current-sink terminal setting quiescent current via external resistor (REXT); 99 nA to 9 μA range defines 5–425 μA IS. |
| 6 - V+ | Positive supply rail | Accepts 2.7–5.5 V; thermal resistance θJA = 171 °C/W - limits max continuous power dissipation to ~290 mW at 25 °C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic power mode selection | Single external resistor (REXT) or DAC-controlled current on ISEL pin adjusts supply current, bandwidth, and output drive in real time. |
| Ultra-low quiescent current | 5 μA minimum supply current enables >10-year battery life in always-on sensor nodes with 200 μA·h coin cells. |
| Stable low-power AC coupling | Maintains DC bias on coupling capacitors during sleep - eliminates multi-second settling delays seen with shutdown-based alternatives. |
| Input bias current | 50 fA typical - enables high-impedance pH sensors, photodiode transimpedance amps, and piezoelectric interfaces without leakage error. |
| Internal bias reference | 110 mV precision reference + 11 kΩ internal resistor - ensures monotonic, predictable ISEL-to-GBW mapping across temperature. |
Applications
| Portable Instrumentation | AC-Coupled Signal Chains |
|---|---|
|
Use Scenario: Handheld multimeter front-end amplifying µV-level thermocouple or mV-level strain gauge outputs. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with programmable bandwidth to reject 50/60 Hz noise only when needed. Use Value: Extends battery life by operating at 42 μA/625 kHz during measurement standby, then scaling to 425 μA/4.6 MHz during active sampling. |
Use Scenario: Audio line driver maintaining DC bias on series coupling capacitors during system sleep. IC Role / Device Role / Timing Role: Always-active inverting amplifier holding quiescent voltage on C1/C2 while drawing <7 μA. Use Value: Eliminates >500 ms turn-on settling; enables instant audio playback resume with no pop/click artifacts. |
| Active Filters | Low-Power Sensor Interfaces |
|
Use Scenario: 2nd-order Sallen-Key anti-aliasing filter preceding a 100 kSPS SAR ADC in a wearable ECG monitor. IC Role / Device Role / Timing Role: Programmable cutoff frequency filter stage synchronized to ADC sampling rate changes. Use Value: Reduces filter power from 425 μA (10 kHz cutoff) to 42 μA (1 kHz cutoff) during motion artifact detection mode. |
Use Scenario: High-impedance pH probe buffer interfacing to an ultra-low-power microcontroller ADC. IC Role / Device Role / Timing Role: Unity-gain follower isolating probe from ADC input capacitance and leakage paths. Use Value: 50 fA input bias prevents >10 mV drift over 24 hours; rail-to-rail output ensures full ADC code utilization at 3.3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV851DBVR | Fixed 500 nA supply current; no ISEL pin or programmable bandwidth; 3.5 kHz GBW; rail-to-rail I/O. | Only suitable for static ultra-low-power use - cannot scale performance on demand like LPV531MK/NOPB. | Select TLV851DBVR only if constant sub-1 μA operation suffices and dynamic bandwidth adjustment is unnecessary. |
| OPA313IDBVR | Fixed 50 μA supply current; 1 MHz GBW; rail-to-rail I/O; no programmability; 1.8 V to 5.5 V supply. | Lacks power-mode flexibility - consumes 10× more current than LPV531MK/NOPB's low-power mode with no runtime benefit. | Choose OPA313IDBVR only when guaranteed 1 MHz bandwidth is required continuously and board space permits larger SOT-23-5. |
Compared with TLV851DBVR and OPA313IDBVR, LPV531MK/NOPB uniquely provides continuous, nanosecond-scale reconfiguration of supply current, bandwidth, and output drive - enabling adaptive power management unattainable with fixed-current op-amps.
Availability
LPV531MK/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, AC-coupled signal chains, and low-power sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for LPV531MK/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on power efficiency, reliability, and broad design support.
LPV531MK/NOPB belongs to TI's programmable micropower op-amp product line, engineered specifically for battery-constrained systems needing runtime-adaptive signal conditioning without sacrificing precision or rail-to-rail functionality.
FAQ
What is the minimum load resistance supported by LPV531MK/NOPB in low-power mode?
LPV531MK/NOPB requires ≥70.8 kΩ load resistance when operating in its 5 μA/73 kHz low-power mode, as defined by output short-circuit current limits and internal bias constraints. Driving lower resistances - such as the 10 kΩ load used in characterization - degrades output swing and stability. For 10 kΩ loads, LPV531MK/NOPB must operate in mid- or full-power mode (≥42 μA). This limitation is inherent to the programmable bias architecture and is documented in Table 2 of the SNOSAK5B datasheet.
How does ISEL pin current relate to supply current and bandwidth in LPV531MK/NOPB?
ISEL pin current sets LPV531MK/NOPB's supply current and bandwidth through a linear relationship: 99 nA ISEL yields ~5 μA IS and 73 kHz GBW; 0.9 μA ISEL yields ~42 μA IS and 625 kHz GBW; 9 μA ISEL yields ~425 μA IS and 4.6 MHz GBW. These values derive from the internal 11 kΩ resistor and 110 mV reference, per Equation (1) in the datasheet. The mapping holds across −40°C to +85°C, with <±10% variation.
Can LPV531MK/NOPB be used with external compensation capacitors?
No - LPV531MK/NOPB uses internal Miller compensation optimized for its programmable transconductance stages. Adding external capacitors to the feedback network or output can shift non-dominant poles, reduce phase margin below 45°, and cause instability - especially at lower REXT settings where gm,out decreases. The datasheet explicitly warns against external compensation; stability is ensured only with resistive feedback and ≤20 pF total capacitive load.
What is the maximum recommended PCB trace length for the ISEL pin on LPV531MK/NOPB?
TI recommends keeping the ISEL pin trace under 2 mm in length and routing it away from noisy nodes (especially OUT, V+, and switching regulators) due to its sensitivity to parasitic coupling. Longer traces increase susceptibility to induced currents that distort the precise 99 nA–9 μA ISEL range, causing unintended shifts in supply current and bandwidth. A guard ring tied to V− around the ISEL trace is advised for high-noise environments.
Does LPV531MK/NOPB support true rail-to-rail input at 2.7 V supply?
At 2.7 V supply, LPV531MK/NOPB maintains −0.3 V to 1.5 V input common-mode range (per CMVR specification), not full rail-to-rail. The upper limit is constrained by the CMOS input stage headroom - it extends to within ~1.2 V of V+, so at 2.7 V, maximum valid input is ~1.5 V. Full −0.3 V to V+ − 1.2 V operation is confirmed at 5 V supply; for true rail-to-rail input at 2.7 V, consider TI's LPV821 or similar.
LPV531MK/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2.5V/µs
- Gain Bandwidth Product:
- 4.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.05 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 425µA
- Current - Output / Channel:
- 24 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LPV531MK/NOPB FAQ
1.How can I place an order for LPV531MK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LPV531MK/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LPV531MK/NOPB reliable?
The price and inventory of LPV531MK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPV531MK/NOPB is usually 5 days.
3.What payment methods are accepted for LPV531MK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPV531MK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPV531MK/NOPB?
LPV531MK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPV531MK/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LPV531MK/NOPB?
For technical support, including LPV531MK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPV531MK/NOPB requirements.
6.How does Aetrix verify that LPV531MK/NOPB is sourced from the original manufacturer or authorized distributors?
All LPV531MK/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LPV531MK/NOPB meets industry standards.
7.What is the process for return or replacement of LPV531MK/NOPB?
All LPV531MK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LPV531MK/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LPV531MK/NOPB part is unused and in its original packaging.
Return procedure for LPV531MK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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