Diodes Incorporated AM9469-T16E-13

Overview

AM9469-T16E-13 from Diodes Incorporated is a single-phase full-wave BLDC motor driver IC with BTL linear output architecture, designed for ultra-low-noise 9–15V cooling fans. It delivers 750mA continuous output current, supports dual-speed control (external PWM or DC voltage via VCONT/RMI), and integrates rotor lock protection, overvoltage shutdown (20.5V typ), thermal shutdown (+175°C), and open-drain FG tachometer and RD lock-detect outputs.

For engineers reviewing the AM9469-T16E-13 datasheet, AM9469-T16E-13 pinout, AM9469-T16E-13 application, or AM9469-T16E-13 equivalent, key selection criteria include its 2.4–18V operating range, 36kHz internal oscillator (CPWM = 100pF), Hall bias output (1.25V), 250mV current-sense threshold (RF = 1Ω → 250mA limit), and TSSOP-16EP thermally enhanced package with exposed pad.

Technical Context

The AM9469 implements a BTL (bridge-tied load) linear driver stage to suppress audible switching noise and EMI in fan applications. Its Hall-input amplifier (48–52dB gain) interfaces directly with unbuffered or buffered Hall sensors, while internal PWM generation compares VCONT voltage against a 3.5Vpp triangular waveform on CPWM to set output duty cycle.

Control logic supports three operational modes: active drive (IN1 high vs IN2), regeneration (both inputs low), and OFF (IN2 high vs IN1). Rotor lock detection triggers automatic 4.5s output disable followed by restart, and overvoltage protection transitions the device to standby mode at 20.5V (typ), releasing at 19.5V (typ).

Key Specifications

Pinout & Package

TSSOP-16EP (Type DX) with exposed thermal pad - 5.0mm × 4.4mm body, 0.65mm pitch, 1.08mm max height; exposed pad enhances thermal dissipation (R_θJA = 35.7°C/W on 4-layer PCB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-phase BLDC motor driver applications.

Compared with A4964KJPTR-T and NCV7707BDR2G, the AM9469-T16E-13 uniquely combines ultra-low-noise BTL drive, integrated 5VREG/REGH, FG/RD diagnostics, and analog+PWM speed control in a compact TSSOP-16EP - making it optimal for cost-sensitive, acoustically demanding fan systems.

Availability

AM9469-T16E-13 is available at Aetrix Electronics and suitable for CPU cooling fans, notebook thermal management, industrial instrument cooling, and medical diagnostic equipment fans requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for AM9469-T16E-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in power management, signal integrity, and connectivity solutions for industrial, computing, and consumer markets.

The AM9469 belongs to Diodes' motor driver product line, engineered specifically for low-noise, high-reliability BLDC fan control in space-constrained and acoustically sensitive applications.

FAQ

What speed control methods does the AM9469-T16E-13 support?

The AM9469-T16E-13 supports two independent speed control methods: external PWM signal applied to the PWM pin (8–100kHz range), or analog DC voltage applied to VCONT with minimum speed set by RMI. Both methods adjust output duty cycle but cannot be used simultaneously; the device detects active mode automatically based on input state.

How does rotor lock protection work on the AM9469-T16E-13?

Rotor lock is detected when FG pulses cease for ≥0.5s (t_{LCK_DET_ON}). The device disables OUT1/OUT2 for 4.5s (t_OFF), asserts RD low, then attempts automatic restart. If rotation resumes, normal operation resumes; if lock persists, the cycle repeats. This prevents coil overheating and ensures safe recovery without MCU intervention.

What is the role of the RF pin and how is current limiting configured?

The RF pin senses voltage across an external resistor to ground. When voltage exceeds 250mV (typ), the current limit circuit activates, clamping output current. For a 250mA limit, connect a 1Ω resistor between RF and GND. Higher limits use R_F = 250mV / I_LIM, e.g., 0.5Ω for 500mA - verified across -40°C to +105°C.

Can the AM9469-T16E-13 drive a 24V fan?

No - the AM9469-T16E-13 has a maximum recommended operating supply voltage of 18V (absolute max 24V is a transient stress rating, not functional). Operating continuously at 24V risks permanent damage. It is validated for 9V, 12V, and 15V BLDC fans per datasheet applications and electrical characteristics.