Very low drop voltage regulators with inhibit

The KF series are very low drop regulators available in SO-8 and DPAK packages and in a wide range of output voltages.

The very low dropout voltage (0.4 V) and the very low quiescent current make them particularly suitable for low noise, low power applications and especially in battery powered systems.

A shutdown logic control function is available (pin 5, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. It requires only a 2.2 μF capacitor for stability allowing space and cost saving.

Key Features

  • Very low dropout voltage (0.4 V)
  • Very low quiescent current (typ. 50 μA in OFF mode, 500 μA in ON mode)
  • Output current up to 500 mA
  • Logic-controlled electronic shutdown
  • Output voltages of 2.5; 3.3; 5; 8 V
  • Internal current and thermal limit
  • Only 2.2 μF for stability
  • Available in ± 2 % accuracy at 25 °C
  • Supply voltage rejection: 70 db (typ.)
  • Temperature range: - 40 to 125 °C

Resources

Technical Documentation

Product Specifications
Description Version Size
DS0912 DS0912: Very low drop voltage regulators with inhibit 13.0 562 KB

Publications and Collaterals

Brochures
Description Version Size
Brochure Power management guide 09.2017 3 MB
Power management for handheld and portable 1.0 1 MB
Support & Community


Sample & Buy

Part Number Package Packing Type Output Voltage (V) (nom) Output Tolerance (typ) Output Current (A) (nom) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
KF33BD-TR SO-8 Tape And Reel 3.3 2 0.5 Active 0.32 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
KF80BDT-TR DPAK Tape And Reel 8 2 0.5 Active 0.343 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
KF50BDT-TR DPAK Tape And Reel 5 2 0.5 Active 0.343 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
KF50BD-TR SO-8 Tape And Reel 5 2 0.5 Active 0.32 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
KF25BD-TR SO-8 Tape And Reel 2.5 2 0.5 Active 0.32 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
KF25BDT-TR DPAK Tape And Reel 2.5 2 0.5 Active 0.368 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
KF33BDT-TR DPAK Tape And Reel 3.3 2 0.5 Active 0.368 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
KF33BD-TR ActiveSO-8IndustrialEcopack2 0 0
KF80BDT-TR ActiveDPAKIndustrialEcopack2
KF50BDT-TR ActiveDPAKIndustrialEcopack2 0 0
KF50BD-TR ActiveSO-8IndustrialEcopack2
KF25BD-TR ActiveSO-8IndustrialEcopack2 0 0
KF25BDT-TR ActiveDPAKIndustrialEcopack2 0 0
KF33BDT-TR ActiveDPAKIndustrialEcopack2 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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