Diodes Incorporated PT7M7437TAEX

Overview

PT7M7437TAEX from Pericom Semiconductor is a dual-threshold microprocessor supervisory circuit with user-adjustable high/low battery detection, 585mV/615mV internal reference, 1.5μA typical supply current, and open-drain active-low LBOL and active-high LBOH outputs in SOT-23-6 package. It monitors Li-ion or multi-cell alkaline/NiMH/NiCd supplies to trigger low-power mode or system shutdown.

For engineers reviewing the PT7M7437TAEX datasheet, PT7M7437TAEX pinout, PT7M7437TAEX application, or PT7M7437TAEX equivalent, key selection criteria include dual adjustable thresholds (VLTHIN− = 585mV, VHTHIN− = 615mV), 90ms minimum timeout, −40°C to +85°C operation, and open-drain output compatibility with independent pull-up voltages up to 5.5V.

Technical Context

The PT7M7437TAEX integrates two precision comparators with internal 585mV and 615mV references, hysteresis (≈5% between VLTHIN+/VLTHIN− and VHTHIN+/VHTHIN−), and timing logic to generate stable low-battery assertions. Thresholds are set externally via resistor dividers on HTHIN and LTHIN pins.

It features separate assertion/deassertion hysteresis for both thresholds, 90–350ms timeout period (tLBOP), and 100μs delay (tLBOD). Outputs LBOL and LBOH are open-drain, enabling interface with higher-voltage logic while operating from battery voltage ≥1.8V.

Key Specifications

Pinout & Package

SOT-23-6 package (TAE code), lead-free and RoHS-compliant, dimensions per JEDEC MO-178AA: 2.9mm × 1.6mm × 1.1mm height, 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-threshold battery monitor applications.

Compared with MAX6326UT46D3+ and TPS3808G12DBVR, PT7M7437TAEX uniquely delivers two independently configurable thresholds and two open-drain outputs - enabling precise three-state battery management (normal/low-power/shutdown) without additional logic or external components.

Availability

PT7M7437TAEX is available at Aetrix Electronics and suitable for portable medical devices, smart meters, wireless sensor nodes, and industrial handheld terminals requiring stable component supply across extended product lifecycles.

Supply support for PT7M7437TAEX 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

Pericom Semiconductor (now part of Diodes Incorporated) is a fabless analog and mixed-signal IC provider specializing in timing, interface, and power management solutions for communications and computing markets.

The PT7M7436/37/38 series was designed specifically for multi-level battery state monitoring in battery-powered portable electronics, delivering precision threshold detection with ultra-low power consumption and flexible output configurations.

FAQ

What is the function of the HTHIN and LTHIN pins on PT7M7437TAEX?

HTHIN sets the high-threshold trip point (VHTHIN− = 615mV) for LBOH assertion, indicating battery exhaustion; LTHIN sets the low-threshold trip point (VLTHIN− = 585mV) for LBOL assertion, indicating battery weakness. Both accept resistor-divider networks for user-adjustable monitoring across 0.62V–6.0V ranges, with internal hysteresis ensuring stable transitions.

Can PT7M7437TAEX operate from a 1.8V supply while driving a 5V logic input?

Yes. Its open-drain LBOL and LBOH outputs can be pulled up to any voltage ≤5.5V, independent of VCC. When VCC = 1.8V, the outputs remain fully compatible with 3.3V or 5V microcontrollers, eliminating need for external level shifters in mixed-voltage battery systems.

How does the 90ms timeout prevent false low-battery assertions?

The 90ms minimum timeout (tLBOP) requires the input voltage to remain below the threshold for ≥90ms before asserting LBOL or LBOH. This filters out short-duration dips caused by pulsed loads (e.g., GSM transmission, motor startup), ensuring only sustained battery depletion triggers system response.

What is the significance of the 585mV and 615mV internal references?

These references define the base thresholds for VLTHIN− and VHTHIN−, enabling accurate, temperature-stable (±100ppm/°C) battery monitoring without external precision references. They allow resistor-divider programming for exact trip points while maintaining <±2% accuracy at 25°C and robust noise immunity.