Texas Instruments TPS544A28 Remote Sense Synchronous Buck Converters
Texas Instruments TPS544A28 Remote Sense Synchronous Buck Converters deliver high-efficiency, 12A step-down conversion with differential remote sensing. The TPS544A28 implements adaptive on-time D-CAP4 control to support fast load-transient response across the output voltage range without an external compensation network. Integrated MOSFETs, accurate load and line regulation, and internal or external feedback options simplify the design of compact point-of-load power systems.
The TI TPS544A28 Buck Converters include a PMBus® interface for device configuration and output voltage, output current, and die temperature telemetry. Pin-strap options allow configuration of the current limit, fault response, feedback mode, output voltage, and switching frequency, while internal nonvolatile memory stores selected PMBus parameters. Eco-mode™ improves light-load efficiency, and Forced Continuous Conduction Mode supports applications that require continuous switching.
Features
- Adaptive on-time D-CAP4 control without an external compensation network
- Ultra-fast load-step response with all-ceramic output capacitors
- Differential remote sensing for accurate point-of-load regulation
- PMBus 1.4-compliant digital configuration and telemetry
- Output voltage, output current, and die temperature telemetry
- User-programmable nonvolatile memory
- Pin-strap configuration of key operating parameters
- Selectable Eco-mode for improved light-load efficiency
- Forced Continuous Conduction Mode operation
- Programmable valley current limit
- Programmable soft-start
- Prebiased start-up capability
- Open-drain power-good output
- Overvoltage and undervoltage fault protection
- Pin-compatible upgrade path to the higher-current TPS544B28
Applications
- Data center compute
- Data center networking
- Industrial automation
- Baseband unit (BBU)
Specifications
- Input voltage range without external bias of 4V to 16V
- Input voltage range with external bias of 2.7V to 16V
- External VCC bias voltage range of 3.1V to 4.5V
- Continuous output current of 12A
- Output voltage range of 0.4V to 5.5V
- Integrated MOSFET on-resistance at VVCC = 3.3V
- High-side MOSFET on-resistance of 8.5mΩ
- Low-side MOSFET on-resistance of 3.0mΩ
- Output voltage accuracy with internal feedback
- ±0.5% from 0°C to +85°C with VOSL set to 1 or 0.5
- ±1% from -40°C to +150°C
- Current telemetry accuracy of ±7.5% at loads of 6A or greater
- PMBus clock frequency up to 1MHz
- Selectable switching frequencies
- 500kHz
- 600kHz
- 800kHz
- 1MHz
- 1.2MHz
- 1.4MHz
- Operating junction temperature range of -40°C to +150°C
- 19-pin WQFN-HR package options
- 3mm x 3mm package with 0.4mm pin pitch
- 3mm x 3.5mm package with 0.5mm pin pitch
- Lead-free and RoHS-compliant construction
Simplified Schematic
Typical Application Efficiency
