Texas Instruments TPS62736

Description

The TPS6273X family provides a highly integrated ultra low power buck converter solution that is well suited for meeting the special needs of ultra low power applications such as energy harvesting. The TPS6273X providesthe system with an externally programmable regulated supply in order to preserve the overall efficiency of the power management stage compared to a linear step down converter. This regulator is intended to step down thevoltage from an energy storage element such as a battery or super capacitor in order to supply the rail to low voltage electronics. The regulated output has been optimized to provide high efficiency across low output currents (<10 μA) to high currents (200 mA).The TPS6273X integrates an optimized hysteretic controller for low power applications. The internal circuitry utilizes a time based sampling system in order to reduce the average quiescent current.To further assist users in the strict management of their energy budgets, the TPS6273X toggles the input power good indicator to signal an attached microprocessor when the voltage on the input supply has dropped below apre-set critical level. This signal is intended to trigger the reduction of load currents to prevent the system from entering an under-voltage condition. There are also independent enable signals to allow the system to controlwhether the converter is regulating the output, only monitoring the input voltage, or shut down in an ultra-low quiescent sleep state.The input power good threshold and output regulator levels are programmed independently via external resistors. All the capabilities of TPS6273X are packed into a small foot-print 14-lead 3.5mm x 3.5 mm QFN package (RGY).

Features

• Industry's highest efficiency at low output currents: > 90% with IOUT = 15 µA
• Ultra-Low Power Buck Converter – TPS62736 Optimized for 50 mA Output Current
• – TPS62737 Optimized for 200mA Output Current
• – 1.3 V – 5 V Resistor Programmable Output Voltage Range
• – 2 V – 5.5 V Input Operating Range
• – 380 nA / 375 nA Quiescent Current During
• Active Operation for TPS62736 / TPS62737
• – 10 nA Quiescent Current During Ship Mode
• Operation
• – 2% Voltage Regulation Accuracy
• 100% Duty Cycle (Pass Mode)
• EN1 and EN2 Control
• – Two Power off states:
• – 1) Shipmode (full power off state)
• – 2) Standby mode includes VIN_OK Indication
• Input Power Good Indication (VIN_OK)
• – Push-pull Driver
• – Resistor Programmable Threshold Level

Typical applications

• Ultra Low Power Applications
• 2-Cell and 3-Cell Alkaline-Powered
• Wireless Sensor Networks (WSN)
• Wireless Sensor Networks (WSN)
• Solar Charger
• Thermal Electric Generator (TEG) Harvesting
• Energy Harvesting
• Low Power Wireless Monitoring
• Bridge and Structural Health Monitoring (SHM)

More information

• Datasheet
• IC product information