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LM2770SD-1215 Folha de dados(PDF) 1 Page - National Semiconductor (TI) |
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LM2770SD-1215 Folha de dados(HTML) 1 Page - National Semiconductor (TI) |
1 / 14 page LM2770 High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode General Description The LM2770 is a switched capacitor step-down regulator that is ideal for powering low-voltage applications in portable systems. The LM2770 can supply load currents up to 250mA and operates over an input voltage range of 2.7V to 5.5V. This makes the LM2770 a great choice for systems powered by 1-cell Li-Ion batteries and chargers. The output voltage of the LM2770 can be dynamically switched between two out- put levels with a logic input pin. Output voltage pairs cur- rently available include 1.2V/1.5V and 1.2V/1.575V. Other pairs of voltage options can be developed upon request. LM2770 efficiency is superior to both fixed-gain switched capacitor buck regulators and low-dropout linear regulators (LDO’s). Multiple fractional gains maximize power efficiency over the entire input voltage and output current ranges. The LM2770 can also be switched into a low-power sleep mode when load currents are light ( ≤ 20mA). In sleep mode, the charge pump is off, and the output is driven with a low-noise, low-power linear regulator. Soft-start, short-circuit protection, current-limit protection, and thermal-shutdown protection are also included. The LM2770 is available in National’s small 10-pin Leadless Leadframe Package (LLP-10). Features n High Efficiency Multi-Gain Architecture: Peak Power Efficiency >85% n Output Voltage Pairs: 1.2V/1.5V and 1.2V/1.575V n Dynamic Output Voltage Selection n ±3% Output Voltage Accuracy n Output Currents up to 250mA n 2.7V to 5.5V Input Range n Low-Supply-Current Sleep Mode n 55µA Quiescent Supply Current in Full-Power Mode n Soft-Start n Short-Circuit Protection in Full-Power Mode n Current-Limit Protection in Sleep Mode n LLP-10 Package (3mm x 3mm x 0.8mm) Applications n DSP Power Supplies n Baseband Power Supplies n Mobile Phones and Pagers n Portable Electronic Equipment Typical Application Circuit 20126001 LM2770 Efficiency vs. Low-Dropout Linear Regulator (LDO) Efficiency 20126011 December 2004 © 2004 National Semiconductor Corporation DS201260 www.national.com |
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