STMicroelectronics STM6600BQ24DM6F

Overview

STM6600BQ24DM6F from STMicroelectronics is a smart push-button on/off controller with Smart Reset™ and power-on lockout functionality, designed for secure system power sequencing in battery-powered portable electronics. It operates from 1.6 V to 5.5 V, delivers 0.6 µA standby current, integrates a precise 1.5 V ±1% voltage reference, supports debounced PB/SR inputs with ±15 kV air-discharge ESD tolerance, and asserts EN or EN to control external MOSFETs or DC-DC converters in handheld audio/video players and smartphones.

For engineers reviewing the STM6600BQ24DM6F datasheet, STM6600BQ24DM6F pinout, STM6600BQ24DM6F application, or STM6600BQ24DM6F equivalent, this device provides verified push-button startup validation, configurable Smart Reset™ delay via CSRD capacitor, PSHOLD-based power-up confirmation, and dual-mode long-push behavior (EN deassertion or RST assertion) - critical for robust embedded power management design.

Technical Context

The STM6600BQ24DM6F implements a state-machine-based power controller with factory-trimmed voltage thresholds (VTH+ = 3.4 V typ., VTH– hysteresis = 200 mV typ.) and integrated debounce logic (tDEBOUNCE = 18 ms typ.). Its Smart Reset™ function uses an external CSRD capacitor charged by a 1.2 µA current source to set tSRD delay, enabling programmable long-press detection independent of internal timing.

Startup requires PB press + VCC > VTH+, followed by PSHOLD high assertion within tON_BLANK (fixed 250 ms for STM6601; PB-hold-dependent for STM6600). The device distinguishes interrupt sources via INT/PBOUT correlation and provides separate VCCLO output for undervoltage monitoring - all while maintaining industrial-grade operation from –40 °C to +85 °C.

Key Specifications

Pinout & Package

STM6600BQ24DM6F is housed in a TDFN12 (2 mm × 3 mm, 0.5 mm pitch) package with wettable flanks, optimized for space-constrained portable PCB layouts and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart push-button controller applications.

Compared with TPS3808G125DBVR and MAX16050ETA+, STM6600BQ24DM6F uniquely integrates push-button sensing, PSHOLD-based power-up validation, Smart Reset™ delay tuning, and dual-mode long-press response - delivering complete hardware-managed power sequencing without MCU intervention.

Availability

STM6600BQ24DM6F is available at Aetrix Electronics and suitable for smartphone power sequencing, portable audio player startup, industrial handheld terminals, and Bluetooth headset power control requiring stable component supply across extended product lifecycles.

Supply support for STM6600BQ24DM6F 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog solutions for industrial, automotive, and consumer markets.

The STM6600 series belongs to ST's Smart Power Management portfolio, engineered specifically for autonomous, low-power, push-button-driven power sequencing in space- and energy-constrained portable electronics.

FAQ

What is the function of the PSHOLD pin, and why is it required?

The PSHOLD pin confirms successful microprocessor initialization during power-up. After detecting a valid PB press and sufficient VCC, STM6600BQ24DM6F asserts EN only if PSHOLD is driven high within tON_BLANK (250 ms). This prevents system enable when the MCU is unresponsive or fails to initialize, ensuring deterministic boot behavior in portable devices.

How does the CSRD pin adjust Smart Reset™ delay time?

The CSRD pin accepts an external capacitor that charges at 1.2 µA. When voltage across the capacitor reaches VSRD (1.2 V typ.), the Smart Reset™ delay tSRD expires. Using a 47 nF capacitor yields ~47 ms tSRD; scaling linearly allows precise long-press timing from 0 to >1 s - enabling differentiation between intentional reset and accidental button hold.

Can STM6600BQ24DM6F replace a discrete push-button + supervisor IC solution?

Yes - it consolidates push-button debouncing, voltage monitoring (VTH+ = 3.4 V, hysteresis = 200 mV), reset generation (tREC = 200 ms), interrupt signaling, and power-enable control (EN/EN) into a single TDFN12 package. This eliminates at least four discrete components (RC debounce, supervisor, MOSFET driver, reference) and associated layout area and firmware complexity.

Is the VREF output mandatory to use, and what happens if left unconnected?

VREF requires a mandatory 1 µF ceramic capacitor to ground, even if unused. Without it, the internal 1.5 V reference becomes unstable, causing erratic behavior in voltage-sensitive functions like VTH+ comparison and CSRD charging. The capacitor ensures proper reference settling and noise immunity - omission risks startup failure or false undervoltage detection.