TPS54361DPR

TPS54361DPR

Part Number: TPS54361DPR

Manufacturer: Texas Instruments

Description: IC REG BCK SPLIT RAIL ADJ 10WSON

Shipped from: Shenzhen/HK Warehouse

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TPS54361DPR Description

The TPS54361 is an integrated high-side MOSFET step-down regulator with a 60-volt input and 3.5-ampere output. Load dump pulses of up to 65 V are safely tolerated by the device, as per ISO 7637. Current-mode control allows for simple external compensation and a wider selection of available components. No-load supply current drops to 152 A when operating in pulse-skip mode with low ripple. When the enable pin is touched, the supply current is limited to 2 A. An auxiliary resistor divider connected to the enable pin can enhance the under-voltage lockout from its default value of 4.3 V.

The soft-start pin, which supports sequencing and tracking, regulates the gradual increase in output voltage. When the open-drain signal for “power good” is present, the output voltage is between 93% and 106% of its nominal value. Switching frequencies can be programmed to meet a wide range of design goals, including improving efficiency, reducing the size of external components, or both. Internal and external parts are safe from damage during an overload thanks to features like thermal shutdown, frequency foldback, and cycle-by-cycle current limits. The TPS54361 comes in a 10-pin, 4-mm-by-4-mm WSON box.

TPS54361DPR Features

  • In low-load conditions, PulseSkipping Eco-ModeTM achieves high efficiency.
  • High-Side Metal-Oxide-Semiconductor Field-Effect Transistor 89m
  • 100 kHz to 2.5 MHz Operating Frequency Range Quiet Current of 152 A and Shutdown Current of 2 A Switching Rate Modulation
  • Keeps Time using an External Source
  • Very Little Voltage Drop Under Light Loads Thanks to Built-in BOOT Recharge FET
  • UVLO Voltage and Hysteresis Controls
  • Quality UV and OV Power Output with Variable Soft Start and Sequencing
  • 8V 1% Internal Voltage Reference

Detailed Description

The TPS54361 is a high-side N-channel MOSFET integrated 60-V step-down (buck) regulator. Constant-frequency current-mode control is used by the device, which helps to minimize output capacitance and simplify external frequency adjustment. The output filter components can be optimized for either performance or compactness thanks to the broad switching frequency range of 100 kHz to 2500 kHz.

A resistor to ground, coupled to the RT/CLK pin, controls the switching frequency. The RT/CLK pin is linked to an internal phase-locked loop (PLL) that allows the device to turn on in response to the falling edge of an external clock signal. The average input voltage for the TPS54361 device is 4.3 V. By connecting two external resistors to the EN pin, and you can modify the input voltage under the voltage lockout (UVLO) threshold.

The EN pin can be left floating, and the device will still function thanks to an internal pullup current source. In a no-load, non-switching state, the operating current is 152 A. It draws 2 A from the power source when the device is turned off. High-efficiency power-supply designs are enabled by the integrated 87-m high-side MOSFET, which can supply a constant 3.5 A to a load.

A bootstrap capacitor is wired from the BOOT to SW pins to power the high-side MOSFET gate-drive bias voltage. Because the bootstrap recharge diode is included in the TPS54361 device, fewer external parts are required. A UVLO circuit checks the voltage on the BOOT pin capacitor and shuts off the high-side MOSFET if the voltage from BOOT to SW drops below a specific value.

The TPS54361 gadget is capable of high-duty cycles nearing 100% thanks to an automatic BOOT capacitor recharge circuit. Accordingly, the minimum input supply voltage of the application is quite close to the maximum output voltage. Internal 0.8-V feedback reference is used as the bare minimum for output voltage. An overvoltage protection (OVP) comparator reduces output overvoltage transients. In operation, the high-side MOSFET is disabled whenever the OVP comparator is engaged and remains disabled until the output voltage drops to less than 106% of the set target voltage.

The SS/TR (soft start/tracking) pin is employed to reduce power-on inrush currents or to sequence the power supply. A capacitor of suitable value must be wired to the pin to modify the soft-start delay. The pin can be linked to a resistor divider for power supply sequencing purposes. The SS/TR pin must be deactivated to turn on the output first. In the event of an overheating fault, a UVLO fault, or a disabled state, this discharging guarantees a consistent restart. When the overload condition is removed, the soft-start circuit manages the recovery from the fault output level to the nominal regulation voltage. To help keep the inductor current under control during start-up and overcurrent fault conditions, a frequency foldback circuit lowers the switching frequency.

Feature Description

● Fixed-Frequency PWM Control

The TPS54361 uses peak current-mode control with a switching frequency that can be adjusted.

An error amplifier compares the output voltage to an internal voltage reference through external resistors linked to the FB pin. The high-side power switch is activated by an oscillator built into the device.

The error amplifier’s COMP pin output controls the current flowing through the high-side power switch. The power is cut off when the current through the high-side MOSFET switch reaches a value determined by the COMP voltage. The COMP pin voltage varies in response to changes in the output current. The gadget limits current flow by raising the clamp voltage on the COMP pin. The pulse-skipping Eco-mode is activated by connecting the COMP pin to a minimum voltage clamp.

● Slope Compensation Output Current

The TPS54361 component compensates the MOSFET switch-current sense signal by adding a ramp. For duty cycles greater than 50%, this slope adjustment dampens any potential for sub-harmonic oscillations. Slope compensation does not affect the high-side switch’s peak current limit, which is maintained at a constant value across the duty-cycle range.

● Pulse-Skip Eco-Mode

Under low loads, the TPS54361 device enters a pulse-skipping Eco-mode to improve efficiency by reducing switching and gate drive losses. The device will enter energy-saving mode if the output voltage is within tolerance and the peak switch current at the end of a switching cycle is lower than the pulse-skipping current threshold. The pulse-skipping current threshold is the peak switch-current level corresponding to a 600 mV nominal COMP voltage. In Eco mode, the device prevents current via the high-side MOSFET and limits the voltage at the COMP pin to 600 mV. As the device fails to switch, the output voltage gradually decreases. When the output voltage drops, the COMP pin’s voltage increases thanks to the voltage control loop. If the error amplifier drives COMP above the pulse-skipping threshold, then the system will malfunction, the high-side MOSFET is activated, and switching can resume.

When COMP falls below the pulse-skipping threshold for Eco-mode, the device returns to Eco-mode, and the output voltage stabilizes at the regulated value. The internal PLL keeps running even when Eco mode is activated. Under low loads and in Eco mode, the switching transitions occur simultaneously as the external clock signal. The TPS54361 sensor, when in Eco mode, measures and controls the peak switch current rather than the average load current. Therefore, the load current at which the device switches to Eco-mode depends on the output inductor’s value. When the load current is very close to zero, the device switches to a pulse-skip mode and consumes only 152 A of quiescent input current.

Conclusion

The device is designed to operate with input voltages ranging from 4.5 V to 60 V. These input quantities must be maintained. If the input supply is more than a few inches from the TPS54361 converter, additional bulk capacitance may be required in addition to the ceramic bypass capacitors. In most cases, a 100 F electrolytic capacitor will do the trick.

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