TPS62737RGYT

The TPS6273X series provides a highly integrated, ultra-low-power buck converter solution designed to meet the special requirements of ultra-low-power applications such as energy harvesting. To maintain overall efficiency at the power management stage relative to a linear buck converter, the TPS6273X provides a system with an externally programmable regulated power supply. This regulator is used to step down the voltage from energy storage elements such as batteries or supercapacitors to power low-voltage electronics. The regulated output has been optimized to deliver high efficiency across the full range from low output current (<10μA) to high current (200mA). The TPS6273X integrates an optimized hysteretic controller for low-power applications. To reduce average quiescent current, the internal circuitry employs a time-based sampling system. To help users further tightly manage their energy budgets, when the voltage on the input supply has dropped below a pre-set critical level, the TPS6273X toggles the power-good indicator to signal a connected microcontroller. This signal is used to trigger load current reduction to prevent the system from entering an undervoltage condition. Separate enable signals allow the system to control whether the converter regulates the output, monitors only the input voltage, or shuts down in an ultra-low quiescent sleep state. The power-good threshold and output regulator level are independently set by external resistors. The full functionality of the TPS6273X is housed in a compact 14-lead 3.5mm×3.5mm QFN package.

Applications

• Ultra-low power applications
• 2-cell and 3-cell alkaline battery-powered applications
• Energy harvesting
• Solar chargers
• Thermoelectric generator (TEG) energy harvesting
• Wireless sensor networks (WSN)
• Low-power wireless monitoring
• Environmental monitoring
• Bridge and structural health monitoring (SHM)
• Smart building control
• Portable and wearable health devices
• Entertainment system remote control

Key features

• Industry-leading efficiency at low output current: >90% at I=15μA
• TPS62736 optimized for 50mA output current
• TPS62737 optimized for 200mA output current
• 1.3V - 5V resistor-programmable output voltage range
• 2V - 5.5V input operating range
• 380nA/375nA quiescent current during active operation for TPS62736/TPS62737
• 10nA quiescent current during shipping mode operation
• 2% voltage regulation accuracy
• 100% duty cycle (pass-through mode)
• EN1 and EN2 control
• Two power-down states: 1) Shipping mode (complete power-down state) 2) Standby mode with VIN_OK indication
• Input power good indication (VIN_OK)
• Push-pull driver resistor-programmable threshold level