LM2853MHX-3.3/NOPB

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LM2853MHX-3.3/NOPB is an adjustable frequency automatic shutdown, step-down DC/DC regulator that is suitable for use in battery-powered applications. The device features adjustable frequency operation, overcurrent protection and is capable of delivering up to 2A of output current. Low standby current consumption makes it ideal for applications involving periodic power cycling.

The LM2853MHX-3.3/NOPB operates from an input voltage range of 4.75V to 18V and is capable of regulating an output voltage from 0.65V to 6.0V. The adjustable frequency feature can be set with external resistors and the device has an output voltage tracking capability that enables users to build a complete dual output supply without additional external components.

The device includes a high-side current-limit comparator which allows users to set the maximum output current as a function of the output voltage. This feature ensures that the device never exceeds a given output current regardless of the load. Additionally, the device also features an adjustable soft-start feature that allows the output voltage to ramp up gradually from zero to its target value.

LM2853MHX-3.3/NOPB is suitable for a wide range of applications including mobile phones, PDAs and other portable applications wherein very low quiescent currents are required. This device can also be used in automotive audio systems, microprocessor core supplies and lighting ballast circuits.

The device can be used as a synchronous current-mode switch-mode power supply with an Enable/Shutdown pin. When the device is placed in shutdown mode, the output voltage is disconnected, the output current reduces to zero and the device consumes only an extremely low quiescent current of 80µA.

The device works on the principle of Step-Down Switching DC/DC Regulator. The device combines an N-channel power MOSFET switch with an on-chip error amplifier, oscillator, thermal shutdown circuitry and fault protection circuitry. The on chip oscillator has an adjustable frequency from 500kHz to 2MHz.

The output voltage is regulated by the switching action of the power MOSFET switch. The control signal for the MOSFET is generated by an on-chip error amplifier which compares the regulated output voltage with an internal reference voltage and generates a pulse width modulated (PWM) signal to control the switch. The error amplifier also provides an adjustable soft-start feature, current limiting and thermal shutdown.

The LM2853MHX-3.3/NOPB has a low on-resistance of 0.43Ohm, which reduces power loss in the device and increases overall efficiency. The device has a wide operating temperature range of -40 degrees Celsius to +85 degrees Celsius, making it suitable for harsh environment applications.

Overall, the LM2853MHX-3.3/NOPB is a fully integrated switching DC/DC regulator that provides high efficiency, low cost and a wide operating temperature range.

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