LTC3709EUH#PBF

Frequency - Switching:	--
Base Part Number:	LTC3709
Supplier Device Package:	32-QFN (5x5)
Package / Case:	32-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	90%
Series:	PolyPhase®
Voltage - Supply (Vcc/Vdd):	3.9 V ~ 37 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction to LTC3709EUH#PBF

The LTC3709EUH#PBF is a highly integrated switching controller IC that provides a simple two-stage synchronous buck converter solution to significantly reduce the cost and size of the power supply design. This controller integrates a current-mode PWM controller, two high-side MOSFET drivers, two low-side MOSFET drivers, and an integrated current-sense amplifier. Additionally, the device has integrated soft-start, programmable undervoltage lockout (UVLO) and other protective features such as over-temperature protection (OTP). The LTC3709EUH#PBF is available in a small 8-SOIC package.

Application Field

The LTC3709EUH#PBF is a highly integrated switching controller IC that is used in many applications such as telecom/datacom, industrial, automotive, and consumer sectors. It is particularly suitable for applications where size and power consumption balance is highly important. In telecom/datacom applications, the LTC3709EUH#PBF is used in the hot line and cellular systems to provide a power supply solution. In industrial applications, the LTC3709EUH#PBF IC is used in off-line power supplies, solar monitoring systems, and LED lighting applications. In the automotive sector, the device is used for LED lighting and infotainment systems. Lastly, in consumer segments, the LTC3709EUH#PBF IC is used in low-end servers, Wi-Fi routers, set-top boxes, and general purpose power supplies.

Working Principle

The LTC3709EUH#PBF is a continuously-conduction-mode buck converter IC, with a single-ended buck topology and a synchronous rectifier design. It utilizes a two-stage design to reduce the parts count and size of the power supply design, as well as reduce overall power losses. The LTC3709EUH#PBF features a 116kHz current-mode PWM controller to achieve fast transient response. Additionally, the PWM includes modulator frequency dithering and spread-spectrum features to reduce EMI. The device includes integrated drivers to drive both high-side and low-side MOSFETs and integrates a current-sense amplifier, eliminating the need for external sense amplifier and simplifying the power supply design.The LTC3709EUH#PBF can be programmed to any desired duty cycle, as well as cutoff frequency from 0.5Hz to 1.3MHz. Other programmable features, such as soft-start, programmable undervoltage lockout (UVLO) and other protective features are also available.

Conclusion

The LTC3709EUH#PBF is an advanced switching controller IC that is suitable for a variety of applications in the telecom/datacom, industrial, automotive, and consumer sectors. Its two-stage synchronous buck architecture eliminates the need for additional external components, allowing for a simple and cost-effective design. The device also features flexible programming options and protective features, making it an ideal solution for many applications requiring efficient and reliable power delivery.

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