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LM2776 데이터시트(PDF) 9 Page - Texas Instruments |
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LM2776 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 23 page LM2776 EN VIN C1+ VOUT GND 2 MHz Osc. Switch Array Switch Drivers C1- Current Limit Reference LM2776 www.ti.com SNVSA56 – MAY 2015 7 Detailed Description 7.1 Overview The LM2776 CMOS charge-pump voltage converter inverts a positive voltage in the range of 2.7 V to 5.5 V to the corresponding negative voltage of −2.7 V to −5.5 V. The LM2776 uses three low-cost capacitors to provide up to 200 mA of output current. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Input Current Limit The LM2776 contains current limit circuitry that protects the device in the event of excessive input current and/or output shorts to ground. The input current is limited to 400 mA (typical at VIN = 5.5 V) when the output is shorted directly to ground. When the LM2776 is current limiting, power dissipation in the device is likely to be quite high. In this event, thermal cycling should be expected. 7.3.2 PFM Operation To minimize quiescent current during light load operation, the LM2776 allows PFM or pulse-skipping operation. By allowing the charge pump to switch less when the output current is less than 40 mA, the quiescent current drawn from the power source is minimized. The frequency of pulsed operation is not limited and can drop into the sub-1-kHz range when unloaded. As the load increases, the frequency of pulsing increases until it transitions to constant frequency. The fundamental switching frequency of the LM2776 is 2 MHz. 7.3.3 Output Discharge In shutdown, the LM2776 will actively pull down on the output of the device until the output voltage reaches GND. In this mode, the current drawn from the output is approximately 1.85 mA. 7.3.4 Thermal Shutdown The LM2776 implements a thermal shutdown mechanism to protect the device from damage due to overheating. When the junction temperature rises to 150°C (typical), the part switches into shutdown mode. The LM2776 releases thermal shutdown when the junction temperature of the part is reduced to 130°C (typical). Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2776 |
유사한 부품 번호 - LM2776_15 |
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유사한 설명 - LM2776_15 |
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