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LM2623ALD Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LM2623ALD Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 11 page Detailed Description OPERATING PRINCIPLE The LM2623 is designed to provide step-up DC-DC voltage regulation in battery-powered and low-input voltage sys- tems. It combines a step-up switching regulator, N-channel power MOSFET, built-in current limit, thermal limit, and volt- age reference in a single 8-pin MSOP package Figure 1. The switching DC-DC regulator boosts an input voltage between .8V and 14V to a regulated output voltage between 1.24V and 14V. The LM2623 starts from a low 1.1V input and remains operational down to below .8V. This device is optimized for use in cellular phones and other applications requiring a small size, low profile, as well as low quiescent current for maximum battery life during stand-by and shutdown. A high-efficiency gated-oscillator topology offers an output of up to 2A at low output voltages. Additional features include a built-in peak switch current limit, and thermal protection circuitry. GATED OSCILLATOR CONTROL SCHEME The on/off regulation mode of the LM2623, along with its ultra-low quiescent current, results in good efficiency over a very wide load range. The internal oscillator frequency can be programmed using an external resistor to be constant or vary with the battery voltage. Adding a capacitor to program the frequency allows the designer to adjust the duty cycle and optimize it for the application. Adding a resistor in addi- tion to the capacitor allows the duty cycle to dynamically compensate for changes to the input/output voltage ratio. We call this a Ratio Adaptive Gated Oscillator circuit. See the Application Notes for sample application circuits. Using the correct RC components to adjust the oscillator allows the part to run with low ripple and high efficiency over a wide range of loads and input/output voltages. 20038814 FIGURE 1. Functional Diagram www.national.com 7 |
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