STMicroelectronics STUSBCD01BJR

Overview

STUSBCD01BJR from STMicroelectronics is a USB charger detection IC designed to identify dedicated wall chargers and host/hub chargers via DP/DM lines in portable devices. It operates from 2.2 V to 4.5 V VBAT, supports 1.6–2.8 V VIO interface voltage, integrates a 1.8 V internal LDO regulator, features 6 V VBUS clamping, and delivers <5 pF DP/DM input capacitance for minimal signal integrity impact in mobile phone charging circuits.

For engineers reviewing the STUSBCD01BJR datasheet, STUSBCD01BJR pinout, STUSBCD01BJR application, or STUSBCD01BJR equivalent, key selection criteria include dual-method detection logic (dedicated vs. current sink), open-drain DETECT output with 300 kΩ internal pull-down, hardware-selectable detection method via DEFAULT METHOD pin, and RoHS-compliant 12-bump Flip-Chip (1.6 × 1.2 mm) packaging for space-constrained USB Type-A/B front-end designs.

Technical Context

The STUSBCD01BJR implements two distinct USB charger detection methods: a dedicated charger method using 15–30 µA DP current source and 50–100 µA DM current sink to sense ≤200 Ω DP-DM short, and a current sink method applying VDAT_SRC (0.615–0.7 V) to DP while sinking 50–100 µA from DM to detect host/hub pull-downs. Detection triggers automatically when VBUS exceeds 2–4 V and SHUTDOWN is low.

It includes an integrated 1.8 V LDO regulator (1.76–1.84 V output, no bypass capacitor required), 6 V VBUS clamping with 470 Ω external series resistor support, and ESD protection of ±2 kV HBM / 200 V CDM on all pins. The device enters <20 µA standby mode when SHUTDOWN is high and supports both GPIO-controlled (STATUS/METHOD, /OE, SHUTDOWN) and hardware-only (DEFAULT METHOD, VIO-absent) operation modes.

Key Specifications

Pinout & Package

STUSBCD01BJR uses a 12-bump Flip-Chip package (1.6 × 1.2 mm, 0.4 mm pitch, max thickness 0.60 mm), halogen-free and RoHS compliant. Bump layout is top-view with defined mechanical dimensions per ST's ECOPACK® specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB charger detection applications.

Compared with TUSB2E11RTWR and MAX14578ETE+, STUSBCD01BJR uniquely balances dual-method detection, ultra-small Flip-Chip footprint, and self-contained regulation-making it optimal for space-constrained smartphones requiring both wall and host charger discrimination without external LDO or complex firmware.

Availability

STUSBCD01BJR is available at Aetrix Electronics and suitable for smartphone charging front-ends, tablet power management subsystems, and portable media player battery charging circuits requiring stable component supply, consistent parametric performance, and long-term obsolescence planning.

Supply support for STUSBCD01BJR 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 intelligent power, analog, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.

The STUSBCD01BJR belongs to ST's USB interface and power management IC product line, engineered specifically to offload charger detection from application processors and enable robust, standards-compliant USB power negotiation in battery-powered portable devices.

FAQ

What detection methods does STUSBCD01BJR support, and how are they selected?

The STUSBCD01BJR supports two detection methods: dedicated charger detection (using DP current source and DM current sink) and current sink detection (applying VDAT_SRC to DP). Selection is controlled either by the STATUS/METHOD pin (software mode) or DEFAULT METHOD pin (hardware mode when VIO is absent). The device automatically runs both methods if needed to distinguish charger types, with timing parameters fully specified in the datasheet.

Does STUSBCD01BJR require an external bypass capacitor for its internal 1.8 V regulator?

No, the STUSBCD01BJR's internal 1.8 V LDO regulator is designed for unconditional stability without an external bypass capacitor. The 1V8V output pin delivers 1.76–1.84 V across temperature and load conditions, and ST explicitly states "bypass capacitor not required" in the pin description table and functional description section.

How does the VBUS clamping function protect downstream circuitry?

The STUSBCD01BJR clamps VBUS to 5.3–6 V using an internal overvoltage protection circuit. When 10 V is applied externally through a mandatory 470 Ω series resistor, the clamp activates within 1 µs. This prevents damage to connected USB PHYs and ensures safe operation during hot-plug events or faulty charger conditions, with minimum VBUS input impedance specified at 400 kΩ.

Can STUSBCD01BJR operate without a VIO supply voltage?

Yes, STUSBCD01BJR supports hardware-only operation when VIO is not present. In this mode, the DEFAULT METHOD pin (VBAT-referenced) selects detection method, and detection is triggered solely by VBUS and SHUTDOWN. However, the pin must not be left floating-ST specifies it must be driven low or high to avoid increased power consumption and undefined behavior.