LTC3372IUK#PBF

Voltage - Supply (Vcc/Vdd):	4.5 V ~ 60 V
Supplier Device Package:	48-QFN (7x7)
Package / Case:	48-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Power Good, Soft Start, Tracking, Watchdog
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	98%
Frequency - Switching:	1MHz ~ 3MHz
Series:	--
Output Phases:	1
Number of Outputs:	5
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

The LTC3372IUK#PBF is a current mode DC-DC switching controller from the PMIC – Voltage Regulators – DC DC Switching Controllers family. It includes three integrated power MOSFETs and two current sense amplifiers that allow it to maintain smooth current and temperature control. The LTC3372IUK is suitable for applications that require high power conversion efficiency.

Features

The LTC3372IUK#PBF compact controller has the following features:• 34V (rated) and 60V (max) input voltage range• 4.5V to 32V adjustable output voltage • 0.55A to 4.2A (max) continuous or 0.55A to 8.4A (max) peak output current • 2.5V to 6V gate drive output• On-chip thermal protection• Built-in soft-start• Output switching frequency up to 600kHz• 78mΩ integrated switch resistance• Interface to external voltage reference

Application Fields

The LTC3372IUK#PBF is suitable for various DC-DC step-down and step-up applications and is ideal for the following applications:• Computer and consumer electronics power supplies • High-efficiency battery chargers • Automotive products• Portable and handheld products • Automated test equipment• Data communications products, etc.

Working Principle

The LTC3372IUK#PBF controls the output voltage by regulating the on/off ratio, or duty cycle, of the integrated power MOSFETs. It uses a current-mode topology which means that the output current is sensed directly. This technique minimizes overshoot and ringing during transient load conditions. The onboard current amplifiers sample the internal MOSFET’s sense voltage and compare it with an internal reference or an external reference. The analog control circuit will then control the duty cycle of the internal MOSFETs accordingly, depending on whether the output voltage is rising or falling.The LTC3372IUK#PBF offers protection against thermal overload and short-circuit conditions. It will take the necessary action, such as shut down, to protect the converter from system damage. It allows for the external circuit to connect to either an adjustable or fixed voltage reference. With an adjustable reference, the output voltage can be increased or decreased with precision.

Conclusion

The LTC3372IUK#PBF from the PMIC – Voltage Regulators – DC DC Switching Controllers family is a current-mode DC-DC switching controller that can be used for various applications. It offers a high level of power conversion efficiency and protection against thermal overload and short-circuit conditions. The controller can be used with an adjustable or fixed voltage reference and it allows for a smooth current and temperature control.

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