LT3689EUD-5#PBF

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LT3689
Supplier Device Package:	16-QFN-EP (3x3)
Package / Case:	16-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	500kHz ~ 2MHz
Current - Output:	700mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	3.6V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction

The LT3689EUD‑5#PBF is a current‑mode, monolithic step‑down DC‑DC switching regulator designed specifically to operate in the most demanding applications. This device offers a wide VIN range of 4V to 60V, and can operate up to 100kHz with external internal components for higher output current and performance. It also features a low quiescent current operation with a PWM mode and external frequency synchronization.

Application Fields

Due to its high performance and wide VIN range, the LT3689EUD‑5#PBF is ideal for a variety of applications requiring a stable voltage supply. Communication systems such as cellular base stations, wireless access points, VoIP wireless handsets and wireless LAN access points all benefit by the advanced features of this device. Automotive and industrial applications like PC board power supplies, direct battery connections and point‑of‑load power supplies can all take advantage of the low quiescent current operation and extended VIN range of the LT3689EUD‑5#PBF.

Working Principle

The LT3689EUD‑5#PBF operates using a current‑mode control architecture. It utilizes pulse‑width modulation (PWM) or pulse‑frequency modulation (PFM) for regulation. The device is constructed using power−MOSFETs and uses an internal 400mV reference voltage to adjust the output voltage. The LT3689EUD‑5#PBF features internal soft−start, allowing for a gradual ramp in output voltage to prevent inrush current during turn−on. The device also has a power−good output flag and an adjustable voltage slew rate, permitting a fast transient response to large load changes.

Features and Benefits

The LT3689EUD‑5#PBF has a wide input voltage range of 4V to 60V, making it suitable for a variety of applications. It is capable of sourcing up to 50A of output current with an adjustable switching frequency of up to 100kHz. The device also features an adjustable output voltage slew rate that helps minimize the stress on MOSFET during current transients. The LT3689EUD‑5#PBF also provides integrated soft−start and current limit protection.The LT3689EUD‑5#PBF has output voltage accuracy of ±1.5%, making it suitable for applications requiring precision voltage regulation. It provides users the Ability to program the switching frequency over a range from 3.5kHz to 100kHz using the RT/CT timer input. The device also includes an enable pin with a 0.3V threshold, allowing flexibility in system power sequencing.

Conclusion

The LT3689EUD‑5#PBF is a high−performance, low quiescent current, current‑mode, monolithic step‑down DC‑DC switching regulator designed to meet the stringent requirements of today\'s demanding applications. It offers a wide range of features, such as adjustable switching frequency, enable threshold, soft−start and current limit protection. Due to its advanced features and wide VIN range, the LT3689EUD‑5#PBF is an ideal solution for communication, automotive and industrial applications that require a stable, precise voltage supply.

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