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Texas Instruments LPV531MKX
- Part No.:
- LPV531MKX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LPV531MKX.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:3,155
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Product details
Overview
LPV531MKX from Texas Instruments is a programmable micropower CMOS-input, rail-to-rail output operational amplifier in a 6-pin SOT-23 package. It delivers continuously adjustable supply current (5 µA to 425 µA), bandwidth (73 kHz to 4.6 MHz), and output short-circuit current via ISEL pin control - enabling dynamic power-performance tradeoffs in battery-constrained signal conditioning circuits.
For engineers reviewing the LPV531MKX datasheet, LPV531MKX pinout, LPV531MKX application, or LPV531MKX equivalent, this page provides verified functional identity, validated pin mapping, confirmed programmable performance ranges, real-world AC-coupled and portable instrumentation use cases, and two technically documented alternative op-amps with quantified differences in quiescent current, bandwidth, and ISEL interface capability.
Technical Context
The LPV531MKX implements a dual internal bias generator architecture: a fixed low-power reference (ISTDB) and a programmable current source (IPROG) derived from an 11 kΩ internal resistor (RINT) and external REXT connected to the ISEL pin. VINT = 110 mV sets the reference voltage across RINT + REXT, defining total bias current.
This architecture enables three distinct, stable operating modes - low (5 µA/73 kHz), mid (42 µA/625 kHz), and full (425 µA/4.6 MHz) - with sub-microsecond mode transition times (tFL = 500 ns, tLF = 210 ns) and input offset voltage < ±4.5 mV across all modes. CMOS input stage ensures 50 fA bias current and −0.3 V to 3.8 V input common-mode range.
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. |
| Supply Current Range | 5 µA to 425 µA - dynamically set via ISEL pin current; enables >85× power scaling for duty-cycled sensing. |
| Gain Bandwidth Product | 73 kHz to 4.6 MHz - scales linearly with supply current; allows bandwidth-on-demand in filter or sensor front-end designs. |
| Input Offset Voltage | ±1 mV (typ), ±4.5 mV (max) - stable across power modes; eliminates recalibration when switching between low/high performance states. |
| Rail-to-Rail Output Swing | Within 30 mV of rails (RL = 100 kΩ) - maximizes dynamic range at 2.7 V supply for low-voltage ADC interfacing. |
| Input Bias Current | 50 fA (typ) - enables high-impedance sensor interfaces (e.g., pH electrodes, photodiodes) without leakage-induced error. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin ambient environments. |
Pinout & Package
LPV531MKX is housed in a 6-pin SOT-23 (DDC) package - footprint-compatible with industry-standard 2.9 mm × 1.6 mm PCB land patterns and reflow-processable per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V− | Negative supply rail | Ground reference for single-supply operation; connects directly to system GND or negative rail. |
| 2 - IN+ | Non-inverting input | High-impedance CMOS node; accepts signals from −0.3 V to 3.8 V (with 5 V supply). |
| 3 - IN− | Inverting input | Differential input node; used with feedback network to configure gain, filtering, or comparator hysteresis. |
| 4 - ISEL | Programmable bias control | Sinks current (0.1 nA–9 µA) to set supply current/bandwidth; requires clean routing to avoid noise coupling. |
| 5 - OUT | Amplifier output | Class AB rail-to-rail stage; drives capacitive loads up to 100 pF while maintaining ≥30° phase margin. |
| 6 - V+ | Positive supply rail | Accepts 2.7–5.5 V; internal ESD protection rated to 2000 V HBM. |
Key Features
| Feature | Design Value |
|---|---|
| Continuously programmable supply current | Adjustable from 5 µA to 425 µA using single external resistor or DAC on ISEL pin - no firmware or digital interface required. |
| Dynamic bandwidth scaling | GBW varies linearly with supply current (73 kHz @ 5 µA → 4.6 MHz @ 425 µA), preserving stability across all modes. |
| Ultra-low input bias current | 50 fA typical enables direct connection to megohm-range sensors without signal attenuation or drift. |
| Fast power-mode transitions | Full-to-low power mode transition in 500 ns; low-to-full in 210 ns - suitable for burst-mode signal acquisition. |
| Rail-to-rail output with low output impedance | Output swing within 30 mV of rails at 100 kΩ load; maintains < 100 Ω effective output impedance up to 100 kHz. |
Applications
| Portable Instrumentation | AC-Coupled Signal Chains |
|---|---|
Use Scenario: Battery-powered handheld multimeter front-end amplifying microvolt-level sensor outputs with intermittent measurement cycles. IC Role / Device Role / Timing Role: Programmable op-amp providing low-noise gain during active sampling and ultra-low-power bias maintenance during sleep. Use Value: Eliminates capacitor discharge/recharge delays; enables instant wake-up with stable DC operating point, reducing measurement latency by >99% vs. shutdown-based alternatives. |
Use Scenario: Audio line receiver with series coupling capacitors requiring continuous DC bias to prevent pop/click on playback start. IC Role / Device Role / Timing Role: Inverting AC-coupled amplifier maintaining quiescent charge on C1/C2 during standby via 5 µA active mode. Use Value: Removes multi-second settling time; achieves usable output within 300 ns after mode switch - critical for responsive user interfaces. |
| Active Low-Power Filters | Medical Sensor Interfaces |
Use Scenario: Tunable second-order Sallen-Key filter in wearable heart-rate monitor, adjusting cutoff frequency based on activity level. IC Role / Device Role / Timing Role: Programmable gain-bandwidth op-amp serving as unity-gain buffer and integrator core with adaptive GBW. Use Value: Enables real-time filter reconfiguration without changing external components; reduces power by 85% during rest periods while retaining signal fidelity. |
Use Scenario: Biopotential amplifier for ECG electrode interface, rejecting motion artifacts while preserving sub-mV ST-segment resolution. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input stage with 50 fA bias current and rail-to-rail output driving 12-bit SAR ADC. Use Value: Prevents electrode polarization errors; supports >10 MΩ source impedances without gain error, extending usable electrode lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV852IDBVR | Fixed 500 nA supply current; no ISEL programmability; 3.5 kHz GBW; rail-to-rail input/output. | Only suitable for static ultra-low-power roles (e.g., always-on comparators); cannot scale bandwidth or drive capability on-the-fly. | Select when absolute minimum quiescent current is mandatory and dynamic performance adjustment is unnecessary. |
| OPA316IDBVR | Fixed 400 µA supply current; 10 MHz GBW; no ISEL pin; 0.3 mV max VOS; 10 pA IB. | Higher speed and precision, but consumes >80× more power in low-signal periods; lacks power-state agility. | Select when consistent high-speed performance is required and battery life is managed via system-level sleep, not analog-domain optimization. |
Compared with TLV852IDBVR and OPA316IDBVR, LPV531MKX uniquely bridges the gap between nanowatt standby and megahertz operation in a single device - enabling true analog-domain power management where supply current, bandwidth, and output drive are co-optimized per signal event rather than fixed at design time.
Availability
LPV531MKX is available at Aetrix Electronics and suitable for portable instrumentation, AC-coupled signal chains, and active low-power filters requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LPV531MKX 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 specializing in analog and embedded processing technologies, with over 50 years of op-amp innovation and broad manufacturing scale.
The LPV531MKX belongs to TI's programmable micropower op-amp product line, designed specifically for energy-constrained systems needing runtime-adjustable analog performance without digital control overhead.
FAQ
What is the function of the ISEL pin on the LPV531MKX?
The ISEL pin on the LPV531MKX sinks a precise current that sets the internal bias current, thereby controlling supply current (5 µA to 425 µA), gain bandwidth product (73 kHz to 4.6 MHz), and output short-circuit capability. It operates with an internal 11 kΩ resistor and 110 mV reference, allowing programming via external resistor or DAC. This pin is central to LPV531MKX's dynamic power-performance adaptability.
Does the LPV531MKX support rail-to-rail input operation?
No - the LPV531MKX features rail-to-rail *output* swing but has a limited input common-mode range of −0.3 V to 3.8 V with a 5 V supply (i.e., does not extend to V+). Its CMOS input stage enables high impedance and low bias current, but input signals must stay ≥1.2 V below V+ to maintain CMRR >50 dB. This is explicitly defined in the LPV531MKX Electrical Characteristics tables.
Can the LPV531MKX drive capacitive loads, and what is its phase margin?
Yes - the LPV531MKX is internally compensated for stability with capacitive loads up to 100 pF, maintaining ≥30° phase margin across all power modes. At 100 pF and RL = 100 kΩ, phase margin is 45° in full-power mode and 70° in low-power mode. Driving larger capacitive loads requires external isolation resistance, as specified in the LPV531MKX application notes.
What is the maximum operating temperature for the LPV531MKX?
The LPV531MKX is rated for continuous operation from −40°C to +85°C, matching industrial-grade requirements. Junction temperature must not exceed +150°C; with θJA = 171°C/W in the SOT-23 package, maximum allowable power dissipation at 85°C ambient is 380 µW. All electrical specifications in the LPV531MKX datasheet are ensured across this full temperature range.
How does input offset voltage behave across LPV531MKX power modes?
The LPV531MKX input offset voltage remains stable across power modes: ±1 mV typical and ±4.5 mV maximum at 25°C in all three characterized modes (low/mid/full). ΔVOS - the difference between full- and low-power mode VOS - is only ±0.1 mV typical, confirming that offset is largely independent of bias current setting. This stability is critical for precision applications using LPV531MKX in adaptive configurations.
LPV531MKX 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
LPV531MKX FAQ
1.How can I place an order for LPV531MKX through Aetrix?
Please submit a Request for Quotation (RFQ) for LPV531MKX 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 LPV531MKX reliable?
The price and inventory of LPV531MKX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPV531MKX is usually 5 days.
3.What payment methods are accepted for LPV531MKX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPV531MKX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPV531MKX?
LPV531MKX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPV531MKX 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 LPV531MKX?
For technical support, including LPV531MKX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPV531MKX requirements.
6.How does Aetrix verify that LPV531MKX is sourced from the original manufacturer or authorized distributors?
All LPV531MKX 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 LPV531MKX meets industry standards.
7.What is the process for return or replacement of LPV531MKX?
All LPV531MKX units undergo pre-shipment inspection (PSI). If there is an issue with LPV531MKX, 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 LPV531MKX part is unused and in its original packaging.
Return procedure for LPV531MKX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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