STMicroelectronics STM6601CA2BDM6F

Overview

STM6601CA2BDM6F 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 adjustable Smart Reset™ delay via external CSRD capacitor, and enforces fixed tON_BLANK power-up confirmation - used in smartphones, audio players, and PDAs.

For engineers reviewing the STM6601CA2BDM6F datasheet, STM6601CA2BDM6F pinout, STM6601CA2BDM6F application, or STM6601CA2BDM6F equivalent, this device requires attention to PSHOLD timing compliance, CSRD capacitor selection for reset delay tuning, EN/EN output polarity configuration, and VREF decoupling with mandatory 1 µF capacitor - all critical for reliable startup and undervoltage-safe operation.

Technical Context

The STM6601 implements a deterministic power-up sequence where enable assertion depends on both PB press duration and PSHOLD confirmation within a fixed tON_BLANK window (not user-adjustable), distinguishing it from the STM6600's PB-hold-dependent startup. Its internal logic integrates debounced PB/SR inputs, dual-threshold VCC monitoring (VTH+ = 3.4 V typ., VHYST = 200 mV), and glitch-immune edge detection for interrupt generation.

Smart Reset™ behavior is configured by external CSRD capacitor charging (ISRD = 1.2 µA typ.) to VSRD threshold, enabling programmable long-push detection timing. The device provides separate open-drain outputs for undervoltage (VCCLO), button state (PBOUT), interrupt (INT), and reset (RST), alongside push-pull EN/EN - supporting flexible power control and system-level fault signaling.

Key Specifications

Pinout & Package

STM6601CA2BDM6F is housed in a TDFN12 (2 mm × 3 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad, optimized for space-constrained portable PCB layouts and low-profile stacking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar push-button power control applications.

Compared with TPS3808G01DBVR and MAX16054ETA+, STM6601CA2BDM6F uniquely integrates hardware-enforced PSHOLD timing, factory-trimmed VTH+/VTH− comparators, and dedicated PB/SR debounce - reducing MCU dependency and enabling certified safe power sequencing in portable medical and industrial devices.

Availability

STM6601CA2BDM6F is available at Aetrix Electronics and suitable for smartphone power management, portable audio player control, and industrial handheld terminal applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for STM6601CA2BDM6F 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 specializing in automotive, industrial, and consumer ICs, with broad analog, power, and microcontroller portfolios.

STM6601 belongs to ST's Smart Power On/Off Controller product line, engineered specifically for secure, low-power, and ESD-hardened push-button sequencing in battery-operated portable electronics - emphasizing hardware-based reliability over firmware-dependent control.

FAQ

What is the function of the PSHOLD pin, and why is it mandatory for STM6601 startup?

The PSHOLD pin serves as a hardware handshake confirming successful MCU initialization during power-up. For STM6601, the host processor must drive PSHOLD high within the fixed 250 ms tON_BLANK window after PB press; failure causes EN deassertion and system shutdown. This prevents booting into undefined states if the MCU fails to initialize - a key safety feature absent in basic reset supervisors.

Can the VREF pin be left unconnected if not used in the design?

No - the VREF pin requires a mandatory 1 µF ceramic capacitor to ground, even if the 1.5 V reference is unused. Omitting this capacitor destabilizes internal biasing, causing erratic PBOUT and INT behavior and potential startup failure. ST specifies this as non-optional in Section 2.3 of the datasheet due to reference regulator loop stability requirements.

How does the CSRD capacitor affect Smart Reset™ behavior, and what value is recommended for typical use?

The CSRD capacitor sets the Smart Reset™ delay time (tSRD) by integrating the internal 1.2 µA charging current to the VSRD threshold (~1.2 V). A 100 nF capacitor yields ~83 ms tSRD - sufficient to distinguish intentional long presses (>100 ms) from accidental double-taps. Values below 47 nF risk false long-press detection; above 220 nF may exceed user expectation for reset response time.

Is the EN output truly push-pull, and can it directly drive a MOSFET gate without external components?

Yes - the EN output is push-pull (not open-drain), capable of sourcing/sinking ≥5 mA at VCC = 3.6 V. It can directly drive the gate of small-signal N-channel MOSFETs (e.g., DMN3025LSD) used in load-switch configurations. However, for high-side PMOS or high-current NMOS, a gate driver buffer remains necessary due to slew rate and charge requirements beyond EN's 10 ns rise/fall time specification.