LTC3626IUDC#TRPBF

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LTC3626IUDC#TRPBF Application Field and Working Principle

The LTC3626IUDC#TRPBF is a low-cost, high-efficiency synchronous step-down switching regulator as a part of Linear Technology’s family of DC/DC regulators and is classified as a PMIC – Voltage Regulators – DC DC Switching Regulators. It is designed to provide a regulated output voltage over wide shifts in line, load, and temperature, suitable for a wide array of applications including computing, communication, and industrial systems. This device offers high power conversion efficiency due to its synchronous operating topology and can handle up to 6 A of continuous output current.

Overview of Features

• Output Voltage Range from 1.1 V to 5.5 V with 0.6 V Flexible Clock Voltage
• High-Efficiency Up to 96%
• Wide Input Voltage Range from 2.7 V to 28 V
• Output Ripple and Noise /*80 mV (Typical)
• Wide Adjustable Frequency Range 2MHz to 4MHz
• Integrated Bootstrap Schottky Diode
• High-Precision Output Voltage Set By External Divider
• Programmable Soft-Start and Output Discharge/UVLO/OTP Functions
• FTB Current-Mode Control Allows Slew Rate and Current “Slope Setting”
• Programmable Frequency/Slope Compensation
• External Standby and System Enable Pin

Pin Layout

The LTC3626IUDC#TRPBF device consists of 11 pins, including the input pins VIN, VIN_FB and SYNC, the control pins BOOT, PLL_CTRL, FB, SHDN, PGND and REF, the output pins PWRGD and VOUT and the thermal pin TEMP. Detailed information about each pin and its associated functions is provided in the device datasheet.

The Working Principle

The device achieves high efficiency by operating a synchronous buck topology that requires synchronous bursts of high and low. The output is regulated through an external resistor divider to define the feed-back level of the regulator. The frequency of operation is controlled through either an internal voltage mode PLL or an external clock applied to the SYNC terminal, allowing fast transient response due to the small loop delays associated with PLL frequency compensation.

The LTC3626IUDC#TRPBF switches current from input to output across two N-channel MOSFETs connected in a parallel configuration. When the P-channel MOSFET is on, current flows from input to output, and when the N-channel MOSFET is on, it flows in the opposite direction. The P-channel MOSFET is controlled by the FB pin, allowing the output voltage to be regulated. The amount of current flowing on the output side is controlled by the SHDN pin, allowing the output current to be regulated.

A charge pump provides the necessary gate drive voltage to the MOSFETs to ensure that they are turned on and off properly. It also provides the necessary gate charge to pull the switches off when the output current is ramped down.

When the input voltage drops, the LTC3626IUDC#TRPBF\'s Soft-Start and Output Discharge features allow for a smooth response and provide a clean output voltage waveform. The Soft-Start function ensures that the device comes out of standard operation into an active soft-start decreasing the operating stresses from transients.

Additionally, the REF pin provides an adjustable slew rate control so that the output voltage does not increase or decrease too quickly during transient operations. This feature provides for a controlled and expected response to the changing load and input voltage conditions.

Output Power

The output power is dependent upon the output voltage and the load current. With a VOUT at 3.3V, the maximum output power is 18W, while the minimum output power is 0.36W. The load current can be set within a range of 3 mA to 6 A.

Conclusion

The LTC3626IUDC#TRPBF is a low cost, high efficiency, synchronous step-down switching regulator with multiple features and a wide range of applications. Its features like the Soft-Start and Output Discharge functions provide for a smooth response to the changing load and input voltage conditions, offering the user a clean output waveform. Additionally, the REF pin provides adjustable slew rate control for controlled response to transient operations. With a wide input voltage range, output range, and up to 6 A of output current, this device can be used for a variety of applications such as computing, communication, and industrial systems.

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