ST1298 1.55A Single-Phase Full-Wave BLDC Motor Driver

Name: ST1298 1.55A Single-Phase Full-Wave BLDC Motor Driver
Brand: STST
SKU: ST1298

ST1298

The ST1298 is a single-coil brushless DC motor driver IC operating from a wide 3V to 18V supply, delivering 0~1.55A output current (1.55A peak) through a single-phase full-wave output stage with a highly efficient direct PWM control method (5~100kHz input). The device integrates an adjustable minimum-speed limit (ST1298R) or minimum stop-PWM setting (ST1298S), adjustable speed-slope control, soft start and a noise-control mode, together with built-in over-temperature protection (TSD 170℃), over-current protection (internal 1.55A limit) and lock protection with automatic restart. A built-in Hall bias and FG speed-feedback output simplify system design. Housed in a TSSOP14-EP (5mm×4.4mm) package with an exposed thermal pad, the ST1298 targets automotive infotainment, HUD projector adjustment, electric shift knobs and on-board chargers.

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Specifications

Power Bus Supply Voltage VMOperating 3~20V; Abs. Max 25V (overview 3~18V)

Output Current per PhaseIOUT 0~1.55A, peak 1.55A (single-phase full-wave)

Rds(on) (HS+LS)HS+LS each 0.4~0.5Ω @VCC=12V, Io=200mA (total ~0.8~1.0Ω)

PWM Carrier Frequency RangePWM input 5~100kHz; internal fixed output 20~28kHz

Current Sensing SchemeBuilt-in current limiting (no external sense resistor)

Motor Control AlgorithmSingle-phase full-wave, Hall-sensor commutation (with Hall)

Control InterfaceSingle PWM speed control; FG output

Dead Time- (self-commutated single-phase, dead time not published)

Quiescent/Sleep Current (Iq/Isleep)Operating current IVCC 4~8mA (VCC=12V)

Protection FeaturesOTP(170℃), OCP(internal limit 1.55A), stall protection + auto restart

Fault FeedbackFG speed feedback output (open-drain)

Logic SupplyLogic input 0~5.5V, no built-in LDO

Operating Temperature-40~105℃ (industrial)

Modulation MethodDirect PWM speed control (single-phase)

Additional FeaturesSoft start, min-speed limit(R)/stall-PWM(S), adjustable speed slope, noise-control mode, built-in Hall bias

PackageTSSOP14-EP (5×4.4, e=0.65)

Product details

Overview

The ST1298 is a single-coil brushless DC motor driver IC operating from a wide 3V to 18V supply, delivering 0~1.55A output current (1.55A peak) through a single-phase full-wave output stage with a highly efficient direct PWM control method. The device integrates an adjustable minimum-speed limit (ST1298R) or minimum stop-PWM setting (ST1298S), adjustable speed-slope control, soft start and a noise-control mode that achieves low-noise, low-vibration BLDC motor operation. Soft start suppresses high peak starting current and provides reliable start-up even at low rotation speeds. Built-in over-temperature protection (150~180℃, 30℃ hysteresis), over-current protection (internal 1.55A limit) and lock protection with automatic restart ensure robust operation, while a built-in Hall bias and FG speed-feedback output simplify system design. Housed in a TSSOP14-EP (5mm×4.4mm) package with an exposed thermal pad, the ST1298 provides a compact motor drive solution for automotive infotainment, HUD projector adjustment, electric shift knobs and on-board chargers.

Features

Single-phase full-wave driver, 3~18V supply voltage range
0~1.55A output current, 1.55A peak drive current
High-efficiency direct PWM speed control (5~100kHz input, 20~28kHz internal output)
Adjustable minimum fan speed limit (ST1298R) / minimum stop PWM (ST1298S)
Adjustable speed-slope control and adjustable soft start / soft restart
Noise-control mode for low-noise, low-vibration operation
Built-in over-temperature protection (TSD 150~180℃, 30℃ hysteresis) and over-current protection (internal 1.55A limit)
Lock protection and automatic restart
Built-in Hall bias (1.2V)
FG speed-feedback output
TSSOP14-EP (5mm×4.4mm, e=0.65, exposed pad) package