Diodes Incorporated ZXBM2003X10TC

Overview

ZXBM2003X10TC from Zetex Semiconductors is a 2-phase DC brushless motor pre-driver IC designed for fan and blower speed control in PC, instrumentation, and HVAC systems. It features FG-only speed feedback (no lock detection), 18V max supply, open-collector FG output with 2× motor frequency, MSOP-10 package, and supports external PWM, thermistor, or voltage-based speed control.

For engineers reviewing the ZXBM2003X10TC datasheet, ZXBM2003X10TC pinout, ZXBM2003X10TC application, or ZXBM2003X10TC equivalent, key selection criteria include its dedicated FG output mode (vs. combined LOCK/FG in ZXBM2001), 24–34 kHz PWM frequency range, Hall amplifier input with ±7 mV offset, and compatibility with bipolar or MOSFET external power stages.

Technical Context

The ZXBM2003 operates as a Hall-sensor-based commutation controller that generates complementary phase drive signals (PH1/PH2) for external transistors. Its internal Hall amplifier accepts differential or single-ended Hall inputs and provides rotor position sensing without external biasing circuitry for 4-pin Hall sensors.

Unlike ZXBM2001/2002, the ZXBM2003 dedicates Pin 6 exclusively to buffered, inverted FG output - delivering a clean, logic-level square wave at exactly twice the motor's rotational frequency - enabling precise tachometer feedback without lock-detection logic or timing capacitor dependencies.

Key Specifications

Pinout & Package

MSOP-10 package (JEDEC MO-187 BA), 3.0 mm × 4.9 mm body, 0.5 mm pitch, exposed thermal pad (not electrically connected). Pin 1 marked by dot; pin numbering counterclockwise from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-phase BLDC fan pre-driver applications.

Compared with ZXBM2001, ZXBM2003 removes lock-detection circuitry to reduce quiescent current and simplify layout; compared with A3977, it lacks integrated power stages but delivers true Hall-commutated BLDC control with native FG tach - making it optimal for cost-sensitive, high-volume fan modules requiring accurate speed reporting.

Availability

ZXBM2003X10TC is available at Aetrix Electronics and suitable for PC cooling, instrumentation blower, and HVAC fan applications requiring stable component supply, long-lifecycle availability, and consistent MSOP-10 packaging.

Supply support for ZXBM2003X10TC 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

Zetex Semiconductors (now part of Diodes Incorporated) is a UK-based analog and power semiconductor specialist focused on high-performance, application-optimized ICs for motor control, sensing, and power management.

The ZXBM200x series was engineered specifically for cost-effective, reliable 2-phase BLDC fan control - emphasizing Hall interface robustness, flexible speed input methods, and FG-based closed-loop monitoring without microcontroller dependency.

FAQ

What is the functional difference between ZXBM2003 and ZXBM2001?

The ZXBM2003 uses Pin 6 exclusively for FG output and omits rotor lock detection logic and CLCK timing functionality. In contrast, ZXBM2001 combines LOCK and FG on Pin 6 and uses CLCK to implement automatic stall recovery. This makes ZXBM2003 simpler, lower-power, and ideal for pure tachometer applications where lock detection is handled externally or unnecessary.

Can ZXBM2003X10TC drive MOSFETs directly without external components?

Yes - its PH1 and PH2 outputs are open-emitter Darlington drivers capable of sinking 80 mA, sufficient to charge/discharge standard logic-level MOSFET gates (e.g., ZXMN3A04DN82) at 24–34 kHz. No gate resistors are required for basic operation, though small series resistors (10–47 Ω) are recommended to damp ringing in high-current layouts.

How does the SPD pin work with an NTC thermistor?

A 100 kΩ NTC thermistor connected between SPD and GND leverages the IC's internal 52.5 kΩ/19.5 kΩ resistor divider to generate a temperature-dependent voltage (1.5 V at 25°C → ~1.0 V at 50°C), translating to ~70% → 100% PWM drive. The internal network linearizes the NTC response, achieving ±2.5% speed linearity across the operating range without software compensation.

Is CLCK pin required for ZXBM2003 operation?

No - CLCK is unused in ZXBM2003 because lock detection is disabled. The pin may be left floating or tied to GND; it must not be connected to a capacitor. Doing so has no effect on FG output or commutation timing, but could introduce noise coupling if left unterminated in high-EMI environments.