Liquid Cooling Pump BLDC Motor Driver ICs
Smart pump solutions for CDUs and direct liquid cooling loops. Precise control, superior efficiency. inergy keeps AI data centers cool, efficient, and always on.
Smart Pumps. Precise Control. Ultimate Efficiency.
Liquid cooling is the critical frontier for AI data centers pushing thermal density limits. inergy's pump driver ICs deliver the reliability, control precision, and efficiency needed for 24/7 always-on cooling loops in CDUs and rack-level liquid cooling.
- FOC vector control — smooth, quiet, vibration-minimized pump operation
- 48V CDU support — iU6398 HV-Buck eliminates thermal limits of external step-down
- Constant flow/power control — maintains reliable cooling under varying back pressure
- Auto-optimize under load variation — self-learning efficiency across all conditions
- Startup in zero/forward/reverse flow — robust in all liquid conditions
- Compact QFN 4×4 — fits 40mm pump PCB form factor for small-form pump designs
AI Datacenter Cooling Architecture
From rack-level CDUs to direct-to-chip liquid cooling, inergy pump ICs address every layer of modern AI datacenter thermal management.
CDU — Coolant Distribution Unit
Central liquid distribution systems delivering coolant to multiple racks. Requires high-reliability 24/7 pump operation with flow monitoring and redundancy support. 48V pump motor preferred.
Rear-Door Heat Exchanger Pump
Rack-integrated liquid cooling loop pumps circulating coolant through rear-door heat exchangers. 12V or 48V pump with precise speed control for thermal efficiency.
Direct Liquid Cooling (DLC) Pump
Small form-factor pumps for direct-to-chip or direct-to-board liquid cooling of GPUs, CPUs, and HBM memory. Low vibration, low noise, compact PCBA design.
Cooling Fan & Pump Driver ICs
Four product families covering all voltage tiers and motor configurations for AI server fans and liquid cooling pumps — now including the new iU6395 N/N FOC controller recommended for high-current 12V designs.
iU6398
HV-Buck integrated FOC driver for 48V server fans. Max 160V N/N pre-driver, internal temperature sensor. Eliminates thermal limits of external step-down loops.
iU6395
Newest 12V-class 3-phase FOC controller — recommended successor to iU6391. N/N MOS pre-driver, dual integrated current-sense amplifiers and op-amps, dedicated 8V gate-drive rail, internal + external thermal sensor.
iU6391
Three-phase sensorless FOC driver with built-in 5V LDO and 40V N/P pre-driver. Supports constant power, constant current, and adjustable lead angle modes. Covers the wider 7–32V (12V/24V) range.
iU6291
Single-phase sine-like waveform driver. Adjustable lead angle (positive/negative/zero-crossing). Waveform control to reduce commutation noise and vibration. 40,000 RPM @ 12V.
Pump Driver IC Selection
| Part | Voltage | Phase | Key Feature | Pump Application | Status |
|---|---|---|---|---|---|
| iU6398 | 20V–80V (120V max) | 3-Phase FOC | HV-Buck integrated, 160V N/N pre-driver, internal OTP | 48V CDU Pump, Data Center Primary Loop | Recommended |
| iU6395 | 5V–18V | 3-Phase FOC | N/N pre-driver, dual current-sense amps, 8V gate-drive rail, int. + ext. OTP | 12V High-Current Rack / DLC Pump | New ★ Recommended |
| iU6391 | 7V–32V | 3-Phase FOC | 5V LDO, 40V N/P pre-driver, constant power/current, Hall optional | 12V/24V Rack Pump, Rear-Door Loop | Active |
| iU6291 | 7V–32V | Single-Phase | Waveform control, lead angle ±, constant power, low noise | 12V/24V Direct Cooling Small Pump | Active |
Why inergy-Drive™ for Liquid Cooling?
Ultra-Low Vibration
FOC sinusoidal current delivery eliminates torque ripple — critical for rack-level vibration budgets in high-density AI facilities.
Constant Flow Control
Constant power/current modes maintain consistent coolant flow regardless of back pressure changes from cold plates or cooling load variation.
All-Condition Startup
Supports zero-flow, forward-flow, and reverse-flow startup. Critical for systems where pumps may start under residual flow conditions.
FG Speed Monitoring
Programmable FG output with adjustable frequency multiplier. Integrates directly with BMC/IPMI for pump health monitoring and control.
Request Liquid Cooling Pump Reference Design
Get application-specific schematics, BOM, Gerber files, and firmware for your pump motor project. FAE engineers will customize for your CDU or rack cooling architecture.