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Texas Instruments LPV531MK
- Part No.:
- LPV531MK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LPV531MK.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,201
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Product details
Overview
LPV531MK from Texas Instruments is a programmable micropower CMOS-input rail-to-rail output operational amplifier. It delivers continuously adjustable supply current (5 μA to 425 μA), bandwidth (73 kHz to 4.6 MHz), and output short-circuit current via external resistor control of the ISEL pin. Used in AC-coupled portable instrumentation where quiescent bias maintenance and rapid power-state transitions are critical.
For engineers reviewing the LPV531MK datasheet, LPV531MK pinout, LPV531MK application, or LPV531MK equivalent, this page provides verified specifications, validated pin functions, confirmed operating modes across temperature (−40°C to +85°C), and real-world design trade-offs between power, bandwidth, and output drive capability.
Technical Context
The LPV531MK uses dual internal bias generators: a fixed low-power reference (ISTDB) and a programmable current source (IPROG) derived from VINT = 110 mV and RINT = 11 kΩ. ISEL pin current sets total bias, enabling dynamic adjustment of transconductance and Miller compensation.
Its frequency response features a single dominant pole (20 dB/decade roll-off) with unity-gain stability up to 4.6 MHz; non-dominant pole location depends on load capacitance (CL) and output stage gm. Output swing remains rail-to-rail (within 30–195 mV of rails) across all power modes at RL ≥ 10 kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V - supports single-cell Li-ion and 3.3 V/5 V logic rails without level-shifting. |
| Supply Current Range | 5 μA to 425 μA - enables >85× dynamic power scaling while maintaining functionality. |
| Gain Bandwidth Product | 73 kHz to 4.6 MHz - directly programmable via ISEL; usable for audio preamps (low power) or active filters (full power). |
| Input Offset Voltage | ±1 mV (typ) - stable across power modes and temperature (±2 μV/°C drift), reducing calibration burden. |
| Input Common-Mode Range | −0.3 V to 3.8 V (at 5 V supply) - extends below negative rail, supporting ground-referenced sensor interfaces. |
| Output Swing | Rail-to-rail - delivers full dynamic range at low supply voltages (e.g., 3.3 V), maximizing SNR in battery-powered systems. |
| Input Bias Current | 50 fA (typ) - enables high-impedance sensor buffering (e.g., pH electrodes, piezoelectric sensors) without signal loss. |
Pinout & Package
LPV531MK is housed in a 6-pin SOT-23 (DDC) package - footprint-compatible with industry-standard 2.9 mm × 1.6 mm space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: V− | Negative supply rail | Reference for ISEL bias network and amplifier core; must be connected to system ground or negative rail. |
| 2: IN+ | Non-inverting input | CMOS input with −0.3 V to 3.8 V common-mode range; 50 fA bias current enables high-Z sensing. |
| 3: IN− | Inverting input | Differential pair input node; matched to IN+ for <±1 mV offset and 95 dB CMRR. |
| 4: OUT | Amplifier output | Class AB rail-to-rail stage capable of sourcing/sinking up to ±3 mA (full power) into 770 Ω loads. |
| 5: ISEL | Power mode programming terminal | Current-sink node controlling internal bias; draws 99 nA to 9 μA to set 5 μA–425 μA supply current. |
| 6: V+ | Positive supply rail | Supplies core and output stage; supports 2.7–5.5 V operation with 171 °C/W θJA thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic power mode setting | Single external resistor (REXT) selects one of three characterized modes (low/mid/full) or any intermediate point - no firmware or digital interface required. |
| Sub-μA quiescent operation | 5 μA minimum supply current maintains amplifier bias and output DC level - prevents coupling capacitor discharge in AC-coupled circuits. |
| Fast mode transition | 210 ns (low→full) / 500 ns (full→low) settling - eliminates startup delay when switching from standby to active signal processing. |
| Stable rail-to-rail output | Output swings within 30 mV of rails at 100 kΩ load and 5 μA current - preserves dynamic range even in ultra-low-power mode. |
| High PSRR/CMRR | 90 dB PSRR and 95 dB CMRR at DC - rejects supply noise and common-mode interference in noisy embedded environments. |
Applications
| Portable Instrumentation | AC-Coupled Signal Chains |
|---|---|
Use Scenario: Battery-powered handheld multimeter front-end amplifying microvolt-level sensor signals with minimal self-heating. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with programmable bandwidth to match measurement speed requirements (e.g., 73 kHz for fast sampling, 4.6 MHz for transient capture). Use Value: Enables >100-hour battery life in low-power mode while retaining ability to switch to full bandwidth for fault detection - no re-biasing delay. | Use Scenario: Audio line driver with series coupling capacitors requiring stable DC bias during sleep states. IC Role / Device Role / Timing Role: Active buffer maintaining quiescent voltage on C1/C2 during standby; transitions to full bandwidth (<1 μs) upon wake-up. Use Value: Eliminates 100-ms to 1-s output settling time seen with shutdown-based op amps - critical for responsive voice-activated systems. |
| Active Filters | Low-Power Sensor Interfaces |
Use Scenario: Tunable 2nd-order Sallen-Key filter in environmental monitor adjusting cutoff frequency based on data rate. IC Role / Device Role / Timing Role: Programmable gain-bandwidth product sets filter Q and fc; ISEL-controlled current adjusts filter response in real time. Use Value: Allows single hardware design to support multiple sensor sampling profiles - no component changes or layout revisions needed. | Use Scenario: pH electrode amplifier in wearable health patch operating continuously on coin cell. IC Role / Device Role / Timing Role: Ultra-low-input-bias (50 fA) buffer preserving electrode potential; 5 μA mode sustains bias without draining battery. Use Value: Achieves >3-year operation on CR2032 while maintaining electrode polarization - impossible with standard op amps drawing >100 μA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable-op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV851DBVR | Fixed 250 nA supply current; no ISEL programmability; 3.5 kHz GBW; rail-to-rail input/output. | Only suitable for static ultra-low-power use - cannot trade bandwidth for current or respond to dynamic load demands. | Select TLV851DBVR only if power is fixed and bandwidth ≤ 3.5 kHz suffices; not a functional substitute for LPV531MK's programmability. |
| OPA313IDBVR | Fixed 50 μA supply current; 1 MHz GBW; rail-to-rail I/O; no external power control. | Lacks dynamic adjustment - requires separate enable/disable circuitry for power gating, adding complexity and startup delay. | Choose OPA313IDBVR for mid-power precision apps needing 1 MHz bandwidth and low offset, but not for adaptive power management. |
Compared with TLV851DBVR and OPA313IDBVR, the LPV531MK uniquely enables continuous, resistor-programmed trade-offs between supply current (5–425 μA), bandwidth (73 kHz–4.6 MHz), and output drive - eliminating need for multiple op amp variants or external power switches in resource-constrained designs.
Availability
LPV531MK is available at Aetrix Electronics and suitable for portable instrumentation, AC-coupled signal chains, active filters, low-power sensor interfaces, and battery-operated medical devices requiring stable component supply across extended temperature ranges.
Supply support for LPV531MK 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 system integration.
The LPV531MK belongs to TI's programmable micropower op amp family, designed specifically for battery-powered systems requiring dynamic performance adaptation without sacrificing precision or rail-to-rail operation.
FAQ
What is the minimum supply current achievable with LPV531MK, and under what conditions?
The LPV531MK achieves a minimum supply current of 5 μA in low-power mode, configured by connecting a 1 MΩ resistor from the ISEL pin to V−. This mode maintains amplifier functionality-including rail-to-rail output swing and input bias-across −40°C to +85°C, enabling continuous biasing of coupling capacitors in AC-coupled circuits without discharge.
How does the ISEL pin control bandwidth and supply current in LPV531MK?
The ISEL pin sinks current (99 nA to 9 μA) that sets the internal bias current IPROG, which combines with ISTDB to determine total supply current (5–425 μA) and transconductance. Since gain-bandwidth product is proportional to transconductance, bandwidth scales linearly from 73 kHz to 4.6 MHz as ISEL current increases - confirmed by characterization data in the LPV531MK datasheet.
Can LPV531MK drive a 10 kΩ load in low-power mode?
No - the LPV531MK's low-power mode (5 μA) is specified for loads ≥ 70.8 kΩ per Table 2 of the datasheet. Driving a 10 kΩ load in that mode limits output swing and risks instability; the device must operate in mid-power (42 μA) or full-power (425 μA) mode for reliable 10 kΩ loading, as verified in Electrical Characteristics tables.
What is the maximum operating temperature range for LPV531MK?
The LPV531MK is rated for continuous operation from −40°C to +85°C, with all electrical characteristics guaranteed across this range. Junction temperature must not exceed +150°C; at TA = +85°C and 425 μA supply current, power dissipation remains within safe limits given the 6-pin SOT-23 package's 171 °C/W θJA rating.
Does LPV531MK require external compensation capacitors for stability?
No - the LPV531MK uses internal Miller compensation optimized for unity-gain stability with capacitive loads up to 20 pF. External capacitors may degrade phase margin or cause oscillation because the internal compensation pole shifts with ISEL-programmed bandwidth; stability is ensured across all power modes without added components.
LPV531MK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LPV531MK through Aetrix?
Please submit a Request for Quotation (RFQ) for LPV531MK 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 reliable?
The price and inventory of LPV531MK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPV531MK is usually 5 days.
3.What payment methods are accepted for LPV531MK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPV531MK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPV531MK?
LPV531MK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPV531MK 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?
For technical support, including LPV531MK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPV531MK requirements.
6.How does Aetrix verify that LPV531MK is sourced from the original manufacturer or authorized distributors?
All LPV531MK 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 meets industry standards.
7.What is the process for return or replacement of LPV531MK?
All LPV531MK units undergo pre-shipment inspection (PSI). If there is an issue with LPV531MK, 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 part is unused and in its original packaging.
Return procedure for LPV531MK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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