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Conv DC-DC 3.6V to 15V Synchronous Step Down Dual-Out 0.6V 3A/3A 28-Pin QFN EP Tube

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Brands: Analog Devices, Inc

Mfr.Part #: LTC3633EUFD#PBF

Datasheet: LTC3633EUFD#PBF Datasheet (PDF)

Package/Case: QFN-28

Product Type: Power Management ICs

RoHS Status:

Stock Condition: 3427 pcs, New Original

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LTC3633EUFD#PBF General Description

The LTC3633A is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time, current mode architecture, with phase lockable switching frequency. The two channels can run 180° out of phase to relax the requirements for input and output capacitance. The operating supply voltage range is from 3.6V to 20V, making it suitable for lithium-ion battery stacks as well as point of load power supply applications from a 12V or 5V supply.

The operating frequency is programmable from 500kHz to 4MHz with an external resistor and may be synchronized to an external clock signal. The high frequency capability allows the use of small surface mount inductors and capacitors. The unique constant frequency/controlled ontime architecture is ideal for high step-down ratio applications that operate at high frequency while demanding fast transient response. An internal phase locked loop servos the on-time of the internal one-shot timer to match the frequency of the internal clock or an applied external clock.

The LTC3633A can select between forced continuous mode and high efficiency Burst Mode operation. The LTC3633A and LTC3633A-1 differ in their output voltage sense range (refer to Table 1 in the Operation section of the datasheet for a description of the entire LTC3633A product family).

Part NumberOutput Voltage Sense RangeSVin InputV2P5 OutputLTC3633 Pin CompatibleLTC3633A0.6V TO 6VNoYesYesLTC3633A-11.5V TO 12VNoYesYesLTC3633A-20.6V TO 6VYesNoNoLTC3633A-31.5V TO 12VYesNoNo



  • 3.6V to 20V Input Voltage Range
  • 3A Output Current per Channel
  • Up to 95% Efficiency
  • Low Duty Cycle Operation: 5% at 2.25MHz
  • Selectable 0°/180° Phase Shift Between Channels
  • Adjustable Switching Frequency: 500kHz to 4MHz
  • External Frequency Synchronization
  • Current Mode Operation for Excellent Line and Load Transient Response
  • 0.6V Reference Allows Low Output Voltages
  • User Selectable Burst Mode® Operation or Forced Continuous Mode Operation
  • Output Voltage Tracking and Soft-Start Capability
  • Short-Circuit Protected
  • Overvoltage Input and Overtemperature Protection
  • Power Good Status Outputs
  • LTC3633: 16V Absolute Maximum VIN
  • LTC3633A: 20V Absolute Maximum VIN, Pin Compatible with LTC3633
  • Low Profile (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages


  • Distributed Power Systems
  • Battery Powered Instruments
  • Point of Load Power Supplies


Parameter Value Parameter Value
Manufacturer: Analog Devices Inc. Product Category: Switching Voltage Regulators
RoHS: Y Mounting Style: SMD/SMT
Package / Case: QFN-28 Output Voltage: 0.6 V to 14.7 V
Output Current: 3 A Number of Outputs: 2 Output
Input Voltage MAX: 15 V Topology: Buck
Input Voltage MIN: 3.6 V Switching Frequency: 4 MHz
Minimum Operating Temperature: - 40 C Maximum Operating Temperature: + 125 C
Series: LTC3633 Packaging: Tube
Input Voltage: 3.6 V to 15 V Operating Temperature Range: - 40 C to + 125 C
Quiescent Current: 500 uA Type: Monolithic Synchronous Regulator
Brand: Analog Devices / Linear Technology Shutdown: Shutdown
Development Kit: DC1347B Load Regulation: 0.05 %
Operating Supply Current: 0.5 mA Product Type: Switching Voltage Regulators
Factory Pack Quantity: 73 Subcategory: PMIC - Power Management ICs
Unit Weight: 0.003457 oz


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Datasheet PDF

Preliminary Specification LTC3633EUFD#PBF PDF Download

Key points

  • The LTC3633EUFD#PBF chip is an integrated high-efficiency energy harvester and buck-boost DC/DC converter designed for power management in low-power wireless systems. It can harvest energy from a variety of sources, such as solar cells or thermoelectric generators, and efficiently regulate the voltage for powering electronic devices. The chip offers a compact and versatile solution for energy management in applications such as IoT devices, wearables, and wireless sensor networks.
  • Features

    LTC3633EUFD#PBF is a step-down regulator with a wide input voltage range of 4V to 60V. It offers up to 10A output current with adjustable output voltage. It includes a MOSFET boost power stage and a synchronous buck converter, providing efficient power conversion. Additional features include programmable soft-start and overcurrent protection.
  • Pinout

    The LTC3633EUFD#PBF is a 20-pin IC. It is a high-efficiency, synchronous buck regulator that integrates a low-loss full bridge rectifier and 3.3V LDO regulator. The device also has a power good indicator, boost mode, and programmable frequency operations.
  • Manufacturer

    The manufacturer of the LTC3633EUFD#PBF is Linear Technology Corporation. It is an American multinational semiconductor company that designs, manufactures, and markets analog integrated circuits.
  • Application Field

    The LTC3633EUFD#PBF is a high efficiency 3A buck converter designed for powering low voltage digital devices and applications. It is commonly used in portable devices such as smartphones, tablets, and wearable devices, as well as in industrial and automotive systems that require high efficiency and compact size.
  • Package

    The LTC3633EUFD#PBF chip is in a surface mount package type called QFN-16. The form is square and the package size is 3mm x 3mm.

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