Texas Instruments LM4132AMF-1.8

Overview

LM4132AMF-1.8 from Texas Instruments is a precision low-dropout (LDO) voltage reference IC delivering a stable 1.8 V output with ±0.05% initial accuracy, 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA quiescent current. It operates from VIN = VREF + 400 mV to 5.5 V, supports up to 20 mA load, and features an enable pin for 3 µA shutdown mode-ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4132AMF-1.8 datasheet, LM4132AMF-1.8 pinout, LM4132AMF-1.8 application, or LM4132AMF-1.8 equivalent, key selection criteria include dropout voltage (230 mV at 10 mA), 0.1–10 Hz noise (170 µV_PP), thermal hysteresis (75 ppm), long-term stability (50 ppm over 1000 hrs), and SOT-23-5 package compatibility with low-ESR ceramic capacitors.

Technical Context

The LM4132AMF-1.8 uses EEPROM-trimmed CMOS band-gap architecture to correct curvature, tempco, and accuracy at package level-overcoming assembly-induced shifts that limit laser-trimmed bipolar references. Its internal LDO regulator eliminates need for output buffer or mandatory C_OUT, unlike shunt references.

It implements a dedicated enable input (EN) with VIH = 65% VIN and VIL = 35% VIN, supporting seamless power sequencing. Dropout is defined as the minimum VIN–VREF differential causing 0.5% output deviation, measured at 10 mA load and specified down to 230 mV (typical) at 25°C.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF3018AIDBZR and ADR3418ARJZ-R7, the LM4132AMF-1.8 uniquely integrates enable control, ultra-low 60 µA supply current, and matched 10 ppm/°C tempco in a pin-compatible SOT-23-5 footprint-making it optimal for power-aware, high-precision embedded systems requiring autonomous shutdown.

Availability

LM4132AMF-1.8 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, medical diagnostics equipment, and automotive battery monitoring systems requiring stable component supply with guaranteed long-term availability.

Supply support for LM4132AMF-1.8 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 decades of expertise in precision analog IC design and high-volume manufacturing.

The LM4132 family was engineered to deliver laser-trimmed reference performance using cost-effective CMOS + EEPROM trimming-targeting high-accuracy data acquisition, test equipment, and battery-constrained industrial systems.

FAQ

What is the maximum load current supported by the LM4132AMF-1.8?

The LM4132AMF-1.8 delivers up to 20 mA of output current while maintaining regulation and specified accuracy. This capability eliminates the need for external buffer amplifiers in most precision applications, including driving ADC reference inputs and low-power op-amp bias networks. The device remains stable under full 20 mA load across its operating temperature range (–40°C to +125°C).

Does the LM4132AMF-1.8 require an output capacitor for stability?

No, the LM4132AMF-1.8 is internally compensated and stable with no output capacitor required. It is explicitly characterized to operate stably with low-ESR ceramic capacitors if added, but C_OUT is optional-not mandatory-for basic regulation. This simplifies layout and reduces BOM count compared to many competing references that demand specific output capacitance.

How does the enable pin (EN) function on the LM4132AMF-1.8?

The EN pin on the LM4132AMF-1.8 is an active-high digital control input. When pulled above 65% of VIN, the device operates normally; when pulled below 35% of VIN, it enters shutdown mode drawing only 3 µA. No external pull-up/down is required-the pin has no internal bias, so system-level GPIO or logic must drive it directly.

What is the minimum input voltage needed for the LM4132AMF-1.8 to regulate at 1.8 V?

The LM4132AMF-1.8 requires VIN ≥ VREF + 400 mV for guaranteed regulation, meaning a minimum input of 2.2 V. At 10 mA load and 25°C, the typical dropout is 230 mV-so regulation begins reliably at VIN = 2.03 V-but 2.2 V is the absolute minimum specified across temperature and process variation to ensure 0.5% output accuracy.

Is the LM4132AMF-1.8 suitable for automotive applications?

The standard LM4132AMF-1.8 is not automotive-qualified; however, the pin-compatible LM4132AMF-1.8-Q1 variant is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient) and shares identical electrical specifications. For automotive BMS, ADAS sensor modules, or infotainment power rails, the Q1 version must be selected-designated by the "-Q1" suffix in the full orderable part number.