High Efficiency  Nanopower Buck Converter with 50mA Load Capability | Step-Down - TPS62736


High Efficiency Nanopower Buck Converter with 50mA Load Capability | Step-Down


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 provides the 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 the voltage 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 a pre-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 control whether 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).


  • 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

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Parametrics Evaluate all products in Step-Down (Buck) Converter

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Regulated Outputs (#) 1
Vin (Min) (V) 2
Vin (Max) (V) 5.5
Vout (Min) (V) 1.3
Vout (Max) (V) -
Iout (Max) (A) 0.05
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 2000
Switch Current Limit (Typ) (A) -
Iq (Typ) (mA) 0.00035
Duty Cycle (Max) (%) -
Soft Start -
  • Adjustable
  • Fixed
  • None
Compensation -
  • External
  • Internal
  • Not Needed
Special Features -
  • Adjustable Current Limit
  • Adjustable UVLO
  • Dynamic Voltage Scaling
  • Enable
  • Frequency Synchronization
  • Light Load Efficiency
  • Phase Interleaving
  • Power Good
  • Synchronous Rectification
  • Tracking
Control Mode -
  • COT with emulated ripple
  • Constant on-time (COT)
  • Current Mode
  • D-CAP
  • D-CAP+
  • D-CAP2
  • D-CAP3
  • Voltage Mode
Preset Vout (V) -
Vref Accuracy (Typ) (%) -
Rating Catalog
  • Automotive
  • Catalog
  • HiRel Enhanced Product
  • High Temp
  • Military
  • Space
Operating Temperature Range (C) -40 to 85 °C to °C
Approx. Price (US$) 0.80 | 1ku
Package Group VQFN
  • CFP
  • DDPAK/TO-263
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • USON
  • VQFN
  • VSON
  • WQFN
  • WSON
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