LT1339CN#PBF

Frequency - Switching:	--
Base Part Number:	LT1339
Supplier Device Package:	20-PDIP
Package / Case:	20-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Current Limit, Enable, Phase Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	90%
Series:	--
Voltage - Supply (Vcc/Vdd):	Up to 20V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LT1339CN#PBF Application Field and Working Principle

The LT1339CN#PBF is a reduced component count micropower voltage mode DC-DC controller featuring low quiescent current, wide input and output voltage range, and programmable frequency of up to 500 kHz. It is designed to offer superior performance and very small total solution size in a variety of low voltage DC-DC conversion applications. The LT1339CN#PBF belong to PMIC (Power Management ICs), voltage regulator and DC-DC switching controllers, making it the ideal choice when it comes to power management of battery operated systems.

Introduction

The LT1339CN#PBF is a voltage-mode DC-DC step-down that operates from a wide input voltage range with a minimum start-up voltage of 2V. Its high efficiency and low quiescent current make it ideal for applications that go from very slow switching frequencies to 500 kHz, permitting simplifications of the external component count and board area, which means it is suitable for noise-sensitive applications. Additionally, the integrated 730 mV feedback reference allows for higher accuracy, improved lightweight designs.

Applications

The LT1339CN#PFB is specifically designed for applications such as portable personal communication and computing products, including notebooks, handheld computers and PDAs. It is also suitable for industrial, automotive and other systems requiring high efficiency at low input voltages.

Features and Benefits

The LT1339CN#PFB provides a number of features and benefits that make it ideal for a wide range of PMIC and DC-DC switching controller applications.• High Efficiency - The device offers a wide input voltage range up to 40V, wide duty cycle up to 90%, enabling high step down conversion efficiency of up to 95%.• Small Solution Size - The ultra compact 4mm x 4mm QFN-14 package ensures the device is suitable for reducing solution size in battery powered and other low-voltage applications. • Low Quiescent Current - The device has very low quiescent current of less than 150μA, making it ideal for battery operated applications. • Programmable Frequency - The switching frequency can be programmed up to 500 kHz, allowing designers to create an optimal balance between efficiency and size.

Working Principle

The LT1339CN#PFB is an integrated voltage-mode DC-DC converter with PWM control for step-down conversion. Thedevice has an output voltage that is programmed via an external voltage divider and is compared by an internal voltage reference. The device has a power stage that includes an external high side N-channel MOSFET and an external low side P-channel MOSFET. The device turns on the external high side MOSFET and then turns off the external low side MOSFET, creating a voltage divider across the load. The output voltage is then regulated by controlling the duty cycle.In order to prevent sub-harmonic oscillations, the output voltage of the LT1339CN#PFB is clamped to a level determined by the clamp pin voltage. The voltage applied to the CLAMP pin can be set up to 1.5V higher than the output voltage. This prevents sub-harmonic oscillations caused by output capacitance charging.

Conclusion

The LT1339CN#PFB is a reduced component count micropower voltage mode DC-DC controller featuring low quiescent current, wide input and output voltage range, and programmable frequency of up to 500 kHz. It is designed to offer superior performance and very small total solution size in a variety of low voltage DC-DC conversion applications. The LT1339CN#PBF belongs to the PMIC (Power Management ICs), voltage regulator, and DC-DC switching controllers, making it the ideal choice when it comes to power management of battery operated systems.

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