Analog Devices Inc./Maxim Integrated MAX6470TA25BD3+

Overview

MAX6470TA25BD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, preset +2.5V output, -12.5% reset threshold accuracy, and 150ms (min) active-low open-drain RESET timeout. It delivers ±2.0% output voltage accuracy over -40°C to +85°C, consumes only 82µA quiescent current, and supports shutdown mode with 0.1µA supply current-ideal for battery-powered portable electronics requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6470TA25BD3+ datasheet, MAX6470TA25BD3+ pinout, MAX6470TA25BD3+ application, or MAX6470TA25BD3+ equivalent, key selection considerations include its fixed +2.5V output, TDFN-EP 8-pin package with exposed paddle, 114mV dropout at 300mA, integrated reset supervisor with manual reset capability absent (SHDN-only control), and compatibility with 3.3µF minimum output capacitance for stable regulation.

Technical Context

The MAX6470TA25BD3+ implements a single-stage LDO architecture with PMOS pass transistor, referenced to an internal 1.229V bandgap-derived SET voltage. Its reset circuit shares the same precision reference and monitors VOUT directly against a -12.5% threshold (i.e., asserts RESET when VOUT falls below 2.1875V for nominal 2.5V output).

It features active-low SHDN input (0.3×VIN logic low, 0.7×VIN logic high), reverse current protection (0.01µA OUT→IN leakage), thermal shutdown at +180°C with 20°C hysteresis, and guaranteed 450mA current limit. The device operates across 2.5V–5.5V input range and maintains stability with ≥3.3µF low-ESR ceramic output capacitor.

Key Specifications

Pinout & Package

MAX6470TA25BD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad (EP), rated for 1951mW max power dissipation at +70°C ambient. GND and EP must be soldered to PCB ground plane for thermal integrity and electrical reference.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO-with-reset applications.

Compared with TPS79925DBVR and ADP196ACBZ-2.5-R7, MAX6470TA25BD3+ uniquely integrates reset supervision with precise 150ms timeout and -12.5% threshold in a single 8-pin TDFN, eliminating BOM count and layout area while guaranteeing coordinated power-up sequencing - critical for systems lacking internal brownout detection.

Availability

MAX6470TA25BD3+ is available at Aetrix Electronics and suitable for handheld medical sensors, USB-powered test equipment, industrial wireless sensor nodes, and low-power digital cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6470TA25BD3+ 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, automotive, and communications markets.

The MAX6469–MAX6484 product line was designed specifically for space-constrained, battery-powered portable electronics needing tightly regulated voltage rails combined with deterministic microprocessor reset behavior - addressing the convergence of power efficiency and system reliability.

FAQ

What is the exact output voltage tolerance of MAX6470TA25BD3+ over temperature?

The MAX6470TA25BD3+ guarantees ±2.0% output voltage accuracy across the full -40°C to +85°C operating temperature range, measured at 1mA ≤ I_OUT ≤ 300mA. This specification applies specifically to the fixed +2.5V output version and is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy (Fixed Output Voltage Operation)" for MAX6469–MAX6476 devices. No additional calibration or external components are required to meet this tolerance.

Does MAX6470TA25BD3+ support manual reset (MR) functionality?

No, MAX6470TA25BD3+ does not include a manual reset (MR) input. Per the Pin Description and Functional Diagram sections, MR is only present on MAX6471–MAX6474 and MAX6479–MAX6482 variants. The MAX6470TA25BD3+ belongs to the SHDN-controlled subgroup (MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–MAX6484) and uses pin 3 exclusively for active-low shutdown - not manual reset.

What is the minimum output capacitance required for stable operation of MAX6470TA25BD3+?

The MAX6470TA25BD3+ requires a minimum 3.3µF low-ESR ceramic capacitor connected between OUT and GND for guaranteed stability across all load and input conditions. This value is explicitly specified in the Typical Operating Circuits and Electrical Characteristics sections. Using less capacitance risks oscillation or poor transient response, especially under 300mA load steps.

Can MAX6470TA25BD3+ be used with an input voltage lower than 2.5V?

No, MAX6470TA25BD3+ has a minimum input voltage rating of 2.5V, as defined in the Absolute Maximum Ratings and Electrical Characteristics tables. Attempting to operate below 2.5V may result in undervoltage lockout activation (V_UVLO = 2.25V min) or failure to regulate. For sub-2.5V inputs, consider alternative regulators such as the MAX1725 or TPS7A05 series.

Is the exposed paddle (EP) on MAX6470TA25BD3+ electrically connected to GND?

Yes, the exposed paddle (EP) on MAX6470TA25BD3+ is internally connected to GND and must be soldered to the PCB ground plane. This connection is mandatory for both thermal performance (derating begins at +70°C) and electrical stability. The datasheet explicitly states "EP is internally connected to GND" and warns against using it as the sole electrical GND connection - it must be reinforced with standard pin 2 (GND) routing.