Texas Instruments INA205AIPW

Overview

INA205AIPW from Texas Instruments is a unidirectional current-shunt monitor IC with 100 V/V gain, dual open-drain comparators (one latching, one with user-programmable delay), and integrated 1.2-V reference output. It operates from 2.7 V to 18 V, supports –16 V to 80 V common-mode input voltage, and delivers 200 kHz bandwidth for precision shunt-based current sensing in high-side or low-side configurations. It is used in overcurrent protection circuits for telecom power supplies and battery chargers.

For engineers reviewing the INA205AIPW datasheet, INA205AIPW pinout, INA205AIPW application, or INA205AIPW equivalent, key selection criteria include its 100 V/V fixed gain, –16 V to 80 V common-mode range, 200 kHz bandwidth, 1.2-V reference output, and dual-comparator architecture with latch and programmable delay - all critical for robust fault detection in industrial and automotive power systems.

Technical Context

The INA205AIPW implements a high-accuracy current-sense amplifier stage followed by two independent comparator blocks. Comparator 1 features internal hysteresis and latch functionality resettable via active-low CMP1 RESET; Comparator 2 includes a capacitor-programmable delay circuit (C_DELAY) and uses an internal 0.6-V reference that can be overridden on 14-pin packages.

Its current-shunt monitor core achieves ±2% total output error over temperature (–40°C to 125°C), 80 dB minimum CMRR at full common-mode range, and 5 μV/°C offset drift. The 1.2-V reference output provides ±12 mV accuracy (±1%) and 40–100 ppm/°C drift, supporting external threshold generation without additional components.

Key Specifications

Pinout & Package

TSSOP-14 package (5.00 mm × 4.40 mm body size), thermally enhanced for continuous operation at up to 125°C ambient. Pinout validated per TI SBOS393E Rev E (November 2015).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-shunt monitor with dual-comparator applications.

Compared with INA204AIPW and INA206AIPW, the INA205AIPW provides highest sensitivity (100 V/V) for low-shunt applications and retains the most widely adopted open-drain, active-low comparator interface - making it optimal for legacy-compatible overcurrent protection where minimal shunt loss and proven fault-handling behavior are prioritized.

Availability

INA205AIPW is available at Aetrix Electronics and suitable for telecom power systems, battery charger protection circuits, and automotive body control modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for INA205AIPW 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 current sensing and power management ICs.

The INA20x family was designed specifically for high-reliability overcurrent detection in power-constrained systems - integrating current sensing, dual fault comparators, and reference generation into a single TSSOP-14 package to reduce design complexity and board space.

FAQ

What is the maximum common-mode voltage supported by the INA205AIPW?

The INA205AIPW supports a common-mode input voltage range from –16 V to 80 V. This allows direct high-side sensing in 48-V telecom systems and compatibility with negative-rail applications such as motor control return paths. The specification is guaranteed across the full operating temperature range of –40°C to 125°C, and the device maintains 80 dB minimum CMRR throughout this range.

How does the programmable delay on CMP2 work in the INA205AIPW?

The CMP2 DELAY pin on the INA205AIPW accepts an external capacitor to set comparator 2's response delay. Using the formula t_D = 5 × C_DELAY, a 0.1 μF capacitor yields a 0.5 s delay. The internal circuit charges the capacitor at 120 nA until reaching a 0.6-V threshold, ensuring reliable rejection of short transients without firmware intervention. This behavior is documented in TI SBOS393E Figure 29.

Can the 1.2-V reference output of the INA205AIPW drive external circuitry?

Yes, the 1.2-V REF output of the INA205AIPW can source or sink up to 1 mA while maintaining ±12 mV accuracy (±1%). Load regulation is specified at 0.4–2 mV/mA, and capacitive loading up to 10 nF is supported without oscillation. This eliminates the need for an external reference IC in applications like threshold generation for auxiliary comparators or ADC reference buffering.

Is the INA205AIPW pin-compatible with other devices in the INA20x family?

Yes, the INA205AIPW in TSSOP-14 (PW package) shares identical pinout and footprint with INA203AIPW and INA204AIPW. All three devices use the same 14-pin configuration, including VIN+, VIN−, OUT, CMP1/CMP2 I/Os, 1.2-V REF, and GND/VS. This enables drop-in gain replacement during design iteration or qualification without PCB revision.

What is the quiescent current consumption of the INA205AIPW?

The INA205AIPW draws 1.8 mA typical quiescent current at 25°C with V_OUT = 2 V, and up to 2.8 mA over temperature (–40°C to 125°C) with zero input differential voltage. This low power draw supports always-on monitoring in energy-sensitive applications such as battery-backed systems and standby power rails, without compromising bandwidth or accuracy.