TPS630702RNMT Breakout Board
Overview
The Boardoza TPS630702RNMT is a high-efficiency, wide-input range Buck-Boost converter module designed to provide a regulated output voltage from power sources that can be either higher or lower than the target output. Built around the Texas Instruments TPS630702 regulator engine, this board utilizes a fixed-frequency PWM controller with synchronous rectification to achieve efficiencies up to 95%.
This module is specifically engineered for dynamic power environments, such as battery-operated systems where the voltage degrades over time (e.g., a single Li-Ion cell discharging from 4.2V to 2.8V). Its seamless automatic transition between Buck (step-down) and Boost (step-up) modes ensures a stable power rail without the drop-outs associated with standard LDOs or single-topology switchers.
Core Technical Specifications
The module is defined by the following operational parameters:
Topology: Synchronous Buck-Boost Converter with automatic mode transition.
Input Voltage Range: Extremely wide input support from 2.0V to 16V, accommodating diverse sources from dual alkaline cells to 12V automotive rails.
Output Voltage: User-selectable presets via onboard jumpers. Default is 3.3V, with hardware configurability for 5V, 7.5V, and 9V.
Current Capacity: Capable of delivering up to 2A continuous output current in both Buck and Boost modes (depending on Vin/Vout ratio).
Efficiency: Peak efficiency rating of 95%, minimizing thermal waste in compact enclosures.
Quiescent Current: Ultra-low standby current consumption (typically 50 µA), critical for extending battery shelf life.
Physical Dimensions: A standardized 40 mm x 60 mm PCB footprint.
Key Engineering Features
Seamless Buck-Boost Transition
The core advantage of this module is its ability to maintain a fixed output voltage while the input voltage crosses the regulation threshold. For example, when powering a 3.3V system from a Li-Po battery (4.2V to 3.0V), the module starts in Buck mode and automatically switches to Boost mode as the battery drains, extracting the maximum possible energy from the cell.
Configurable Power Modes
To optimize performance for specific loads, the board includes a PS/SYNC jumper.
Power Save Mode (PSM): Improves efficiency at light loads by reducing switching frequency (PFM), ideal for idle microcontrollers.
Forced PWM Mode: Maintains a fixed switching frequency for low output ripple and low noise, which is preferable for sensitive analog or audio circuits.
Integrated System Protection
The module features a robust safety architecture including Output Overvoltage Protection, Overtemperature Shutdown, and Undervoltage Lockout (UVLO). Notably, it includes a "Load Disconnect" feature during shutdown, which physically isolates the output from the input to prevent battery leakage currents.
Hardware Interface and Signal Mapping
The breakout board provides access to power and control lines via clearly labeled headers and jumpers:
Power Connectors
VIN (Molex/Header): Primary DC power input (2.0V - 16V).
VOUT (J3): Regulated output voltage terminals.
GND: Common system ground.
Control Logic (Jumpers)
JP1 (EN): Enable Pin. Pulling High (default) enables the regulator; pulling Low puts it into shutdown mode (<1µA current).
JP2 (PS/SYNC): Power Save Select.
LOW: Enables Power Save Mode (Variable Frequency) for high efficiency at light loads.
HIGH: Forces Constant Frequency PWM mode for low noise.
JP3 (V_SEL): Output Voltage Selection.
LOW: Selects default output (e.g., 3.3V).
HIGH: Selects alternative voltage preset (configurable for 5V, 7.5V, 9V).
Status Indication
PG (J2): Power Good output. An open-drain signal that goes high impedance when the output voltage is within 90% of the target value, useful for system reset sequencing.
Applications
Battery-Powered IoT: Stabilizing 3.3V rails from single-cell Li-Ion or 2xAA batteries.
Industrial Sensors: Providing clean 5V or 9V from fluctuating 12V or 24V industrial buses.
USB Power Delivery: Boosting 3.7V battery voltage to stable 5V for USB OTG applications.
Portable Instrumentation: Ensuring constant performance as battery voltage declines over the discharge curve.
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