TPS55340RTER IC

Technical Specifications of TPS55340RTER

Datasheet	TPS55340RTER datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer	Texas Instruments
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Function	Step-Up, Step-Up/Step-Down
Output Configuration	Positive, Isolation Capable
Topology	Boost, Flyback, SEPIC
Output Type	Adjustable
Number of Outputs	1
Voltage – Input (Min)	2.9V
Voltage – Input (Max)	32V
Voltage – Output (Min/Fixed)	2.9V
Voltage – Output (Max)	38V
Current – Output	5.25A (Switch)
Frequency – Switching	94kHz ~ 1.14MHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	16-WFQFN Exposed Pad
Supplier Device Package	16-WQFN (3×3)

TPS55340RTER Description

The TPS55340 combines a 5-A, 40-V power switch and a monolithic, nonsynchronous switching regulator. Boost, SEPIC, and isolated flyback are just a few of the common switching-regulator topologies in which the device can be set up. The device can accept input voltage from multicell batteries and regulated 3.3-V, 5-V, 12-V, and 24-V power rails, supporting applications using these input voltage sources. The TPS55340 features an inbuilt oscillator and regulates the output voltage using current mode PWM control. An external resistor synchronized to an external clock signal will set the PWM’s switching frequency.

The user can set the switching frequency anywhere between 100 kHz and 1.2 MHz. The device contains further built-in safety measures like cycle by the thermal shutdown, cycle overcurrent limit, and a programmable soft-start mode to reduce inrush current during startup. Small 3-mm 3-mm, 16-pin QFN, and 14-pin HTSSOP packaging with Power PAD for improved thermal performance are available for the TPS55340. Pin-to-pin is compatible with the 3-A, 40-V TPS61175, the 5-A, 40-V TPS55340 boost converter increases the maximum input voltage from 18 V to 32 V.

TPS55340RTER Features

• Low-side, 40-V, 5-A MOSFET switch inside the device.
• 7% reference voltage, input voltage range: 2.9-V to 32-V.
• Operating quiescent current of 0.5 mA.
• Shutdown supply current of 2.7 A.
• PWM control in fixed frequency current mode.
• tunable frequency ranging from 100 kHz to 1.2 MHz.
• capacity to synchronize with an external clock.
• Flexible soft-start duration.
• Pulse skipping to improve performance under light loads.
• protection from UVLO, thermal shutdown, and cycle-by-cycle current limit.

TPS55340RTER Feature Description

Operation

The TPS55340 gadget regulates the output with current-mode, pulse-width modulation (PWM) control if it is intended to be a boost converter. The PWM control circuitry activates the switch at the start of each oscillator clock cycle. As the inductor current increases, the input voltage is applied to store energy. The output capacitor supplies the load current during this phase of the switching cycle. The power switch shuts off, and the external Schottky diode is forward-biased to allow the inductor current to pass to the output when the inductor current reaches a threshold level determined by the error amplifier output.

The inductor transfers stored energy to refuel the output capacitor and deliver the load current. Every switching cycle involves a repeat of this action. The PWM control comparator, which evaluates the output of the error amplifier and the current signal, establishes the converter’s duty cycle. The external resistor or external clock signal can be used to program the oscillator frequency.

An oscillator ramp signal is added to the inductor current ramp to offer slope correction. Slope compensation is necessary to prevent subharmonic oscillation, which is inherent to peak-current mode control at duty cycles greater than 50%. The internal slope adjustment might not be sufficient to ensure stability if the inductor value is too tiny.

Frequency Foldback and Overcurrent Protection.

When the inductor current reaches the overcurrent limit threshold, The power switch is turned off by the cycle-by-cycle overcurrent protection of the TPS55340.  The PWM circuitry resets itself at the start of the following switch cycle. The output voltage starts to fall as a function of the output load during an overcurrent event. The switching frequency automatically decreases to 1/4 of the regular value when the FB voltage passing through the feedback resistors falls below 0.9 V.

● Minimum On-Time and Pulse Skipping

The minimum PWM pulse width for the TPS55340 PWM control system is 77 ns (typical). The minimal duty cycle of the PWM is determined by this minimum on-time for every given switching frequency. The TPS55340 enters pulse-skipping mode when the voltage regulation loop requires a minimum on-time pulse width of fewer than 77 ns. To prevent the output voltage from climbing above the desired regulated value, the device in this mode will hold the power switch off for a number of switching cycles. When the PWM is operating in discontinuous conduction mode under low load conditions, this action frequently takes place.

Soft-Start

The TPS55340’s integrated soft-start circuit considerably reduces the start-up current spike and output voltage overshoot. An internal bias current source (6 A, typically) charges a capacitor (CSS) on the SS pin when the IC is enabled. The output of the internal error amplifier, which determines the peak current and duty cycle of the PWM controller, is clamped by the voltage at the capacitor.

With a gentle ramp on the SS pin, the inrush current and output voltage overshoot can be decreased by limiting the peak switch current during startup. Once the capacitor reaches 1.8 V, the soft-start cycle is complete, and the voltage no longer clamps the error amplifier’s output. The IC enters the shutdown mode when the EN is pushed low for at least 1 ms, and the SS capacitor is discharged via a 5-k resistor to prepare for the subsequent soft-start procedure.

Enable and Thermal Shutdown

When the EN voltage is less than 0.68 V (minimum) for more than 1 ms, the TPS55340 enters shutdown. The device’s input supply current is at its maximum during shutdown, which is less than 10 A. An inbuilt 950-k pulldown resistor on the EN pin disables the device if it floats. An inbuilt thermal shutdown turns off the gadget when the junction temperature rises above 165°C (typically). When the junction temperature lowers by 15°C, the gadget will restart.

TPS55340RTER Device Functional Modes

● Operation With VIN < 2.9 V (Minimum VIN)

With input voltages greater than 2.9 V, the TPS55340 device can function. The TPS55340 gadget stays off at input voltages below its usual UVLO voltage (turning off), which is 2.5 V. The gadget tries to function for input voltages between the UVLO threshold and 2.9 V, but the electrical parameters are not guaranteed.

● Operation with EN Control

The enabled rising-edge threshold voltage has a typical hysteresis of 0.16 V and is 1.08 V. The device is disabled, and switching is prevented when the EN pin is positioned below the turn-off voltage. In this state, the IC quiescent current is decreased. The device turns on when the input voltage rises over the UVLO threshold and the EN pin voltage rises above the rising edge threshold. The soft-start sequence starts as soon as the switch is enabled. At the soft-start time set by the external soft-start capacitor, the TPS55340 device turns on.

TPS55340RTER Application Information

Boost, SEPIC, and isolated flyback are just a few of the common switching-regulator topologies in which the TPS55340 device can be set up. For instance, the boost topology-configured device frequently changes a lower dc voltage to a higher dc voltage with a maximum switching current of 5.25 A. Use the design process below to choose component values for a boost converter design or a SEPIC design for the TPS55340 device. Alternatively, create a complete design using the WEBENCH® software. When creating a design, the WEBENCH software employs an iterative design process and consults a sizable database of components. The design process is briefly discussed in this section.

Conclusion

In conclusion, the TPS55340 is a fantastic choice for various applications since it is a highly adaptable switching regulator that can handle several industry-standard topologies. This device is built to provide dependable and effective performance. Its built-in features include UVLO protection, thermal shutdown, and cycle-by-cycle overcurrent protection. For engineers searching for a versatile way to power their systems, its compatibility with the TPS61175, wider input voltage range, and tiny form factor make it a compelling choice.

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