STMicroelectronics STM6600DA55DM6F

Overview

STM6600DA55DM6F 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, features a precise 1.5 V ±1% voltage reference, supports debounced PB/SR inputs with ±15 kV air-discharge ESD tolerance, and provides active-high or active-low enable output (EN/EN) for direct MOSFET or DC-DC converter control.

For engineers reviewing the STM6600DA55DM6F datasheet, STM6600DA55DM6F pinout, STM6600DA55DM6F application, or STM6600DA55DM6F equivalent, this device enables robust power-up confirmation via PSHOLD, configurable Smart Reset™ delay via CSRD capacitor, and dual-mode long-push response (RST assertion or EN deassertion), making it critical for fail-safe startup in handheld and embedded systems where supply integrity and user-initiated reset reliability are essential.

Technical Context

The STM6600DA55DM6F 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 for both PB and SR inputs. Its Smart Reset™ delay (tSRD) is externally programmable via CSRD capacitor charging at ISRD current, enabling precise long-press timing independent of supply voltage.

Startup requires valid PB press + VCC > VTH+, followed by PSHOLD confirmation within tON_BLANK - a fixed blanking period ensuring microprocessor readiness before EN assertion. During normal operation, INT asserts on undervoltage (VCC < VTH–) or PB press, while VCCLO provides dedicated high-threshold status indication and VREF supplies a stabilized 1.5 V reference with 1% accuracy over –40 °C to +85 °C.

Key Specifications

Pinout & Package

STM6600DA55DM6F is housed in a 2 × 3 mm TDFN12 package with exposed thermal pad, optimized for space-constrained portable PCB layouts and thermal performance in low-power applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX16050ETA+, the STM6600DA55DM6F uniquely integrates push-button interface logic, Smart Reset™ delay programming, PSHOLD-based power-up validation, and a precision 1.5 V reference - eliminating four discrete components and enabling fail-safe, battery-aware power sequencing in space- and power-constrained portable systems.

Availability

STM6600DA55DM6F is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld terminals, wireless audio players, and smart wearables requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for STM6600DA55DM6F 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, delivering innovative solutions across automotive, industrial, power, and consumer markets with strong focus on energy efficiency and system integration.

The STM6600 series belongs to ST's Smart Power Management portfolio, designed specifically for intelligent, ultra-low-power system power control in battery-operated portable electronics where secure startup, user-initiated reset, and supply integrity monitoring are mission-critical.

FAQ

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

The PSHOLD pin confirms successful microcontroller initialization during power-up. After PB press and VCC validation, the MCU must drive PSHOLD high within tON_BLANK (typically 100–200 ms) to sustain EN assertion. If unmet, EN deasserts - preventing operation with an unresponsive or uninitialized processor. This is a hardware-enforced safety feature unique to the STM6600 family.

Can the STM6600DA55DM6F operate with a 1.8 V supply, and what is its behavior at that voltage?

Yes - the device operates from 1.6 V to 5.5 V. At 1.8 V, all core functions remain active: PB/SR inputs are fully debounced, VREF outputs 1.5 V ±1%, EN/EN drives loads, and INT/VCCLO provide accurate status. However, VTH+ threshold remains fixed at 3.4 V (typ.), so 1.8 V supply will not meet startup condition - the part enters standby mode until VCC rises above VTH+.

How is the Smart Reset™ delay (tSRD) calculated, and what capacitor value is recommended for a 500 ms delay?

tSRD is determined by CSRD capacitor charging time: tSRD ≈ (VSRD × CSRD) / ISRD, where VSRD = 1.25 V (typ.) and ISRD = 1.2 µA (typ.). For 500 ms, CSRD ≈ 0.5 s × 1.2 µA / 1.25 V ≈ 480 nF - a standard 470 nF X7R ceramic capacitor is recommended. Lower ESR improves timing accuracy and noise immunity.

Is the VREF output mandatory to use, and what happens if no capacitor is connected?

Yes - a 1 µF ceramic capacitor is mandatory on VREF, even if the reference is unused. Without it, internal regulation becomes unstable, causing erratic EN assertion, premature RST pulses, or failure to exit reset. The capacitor ensures loop stability and suppresses reference output noise; omitting it violates the device's absolute maximum operating conditions and risks functional failure.