LM2611AMF/NOPB

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The LM2611AMF/NOPB is an integrated low-power buck-boost switching regulator designed to provide up to approximately 2 A of output current. It is an integrated high-efficiency voltage regulator, with both buck and boost modes, intended for use in a wide range of applications. The device features advanced protection features that are ideal for use in devices with high energy demands and limited power budgets. The device offers efficient and cost-effective regulation by combining both synchronous buck and buck-boost architectures.

Description

The LM2611AMF/NOPB is a low-power, integrated buck-boost switching regulator. The device is designed to provide variable output voltage over a wide range of input voltages. The device includes a high side N-channel MOSFET, a low side N-channel MOSFET, an integrated topologies and inductor, and a voltage divider to sense the input and output voltage of the device. It also includes a high current output driver, an LED driver, and thermal shutdown. The device can be configured to operate in either buck or boost mode. The device includes an integrated 7-bit fractional-N PLL to allow for an optimized switching frequency range of 200kHz to 1.2MHz.

Application Field

The LM2611AMF/NOPB is ideally suited for powering applications that require efficient, cost-effective regulation of both buck and boost regulation modes. The device is suitable for applications such as notebooks, netbooks, cellular phones, digital still cameras, MP3 players, video cameras and hand-held gaming devices. The device is optimized for space-constrained applications such as those that require low standby power.

Features

• Input 6 V to 36 V; output voltages adjustable 0.6 V to output voltage
• Wide output voltage range: 0.6 V – 35 V
• Integrated 7-bit fractional-N PLL with synchronous demodulation
• High output current capability: up to 2 A
• Integrated low-side N-channel MOSFET and high-side N-channel MOSFET switch
• Low stand-by current
• Integrated over-voltage, over-current and thermal protection
• Operating temperature range –40 °C to +85 °C

Working Principle

The LM2611AMF/NOPB employs a buck-boost architecture to achieve optimal efficiency over a wide range of output voltages. The device consists of an integrated buck and boost switch along with a voltage divider connected to the gate of the high side MOSFET. A 7-bit fractional-N PLL is used to switch the buck and boost PWM signals, allowing for an optimized switching frequency range of 200kHz to 1.2MHz. The voltage divider determines the output voltage at the end of the switch cycle. The output voltage is regulated by adjusting the switching frequency of the PLL and changing the division ratio of the voltage divider.

The LM2611AMF/NOPB also features over-voltage protection, over-current protection and thermal protection. The over-voltage protection is activated by monitoring the output voltage, and if this voltage exceeds the set level, the device shuts down. The over-current protection is activated if the current exceeds the current limit, and the device shuts down. The thermal protection is triggered when the temperature exceeds the set limit and the device shuts down.

The LM2611AMF/NOPB is an integrated, low-power buck-boost switching regulator which is designed to provide efficient, cost-effective regulation of both buck and boost regulation modes. The device includes many advanced protection features, making it ideal for space-constrained applications such as those with high energy demands and limited power budgets.

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