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LM2771 датащи(PDF) 3 Page - Texas Instruments |
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LM2771 датащи(HTML) 3 Page - Texas Instruments |
3 / 16 page LM2771 www.ti.com SNVS435 – MARCH 2006 Operating Ratings (1) (2) Input Voltage Range 2.7V to 5.5V Recommended Load Current Range 0mA to 250mA Junction Temperature (TJ) Range -30°C to +110°C Ambient Temperature (TA) Range (3) -30°C to +85°C (1) Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. (2) All voltages are with respect to the potential at the GND pins. (3) Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 110ºC), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application ( θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX). Thermal Properties Junction-to-Ambient Thermal Resistance ( θJA), WSON-10 Package (1) 55°C/W (1) Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists, special care must be paid to thermal dissipation issues. Electrical Characteristics (1) (2) Limits in standard typeface are for TJ = 25ºC. Limits in boldface type apply over the full operating junction temperature range (-30°C ≤ TJ ≤ +110°C) . Unless otherwise noted, specifications apply to the LM2771 Typical Application Circuit (pg. 1) with: VIN = 3.6V; V(EN) = 1.8V, CIN = C1 = 1.0µF, COUT = 4.7µF. (3) Symbol Parameter Condition Min Typ Max Units 3.0V ≤ VIN ≤ 5.5V 1.455 1.545 1.5 0mA ≤ IOUT ≤ 200mA ( −3%) (+3%) 3.0V ≤ VIN ≤ 5.5V 1.475 1.525 VOUT 1.5V Output Voltage Regulation 1.5 V IOUT = 150mA ( −1.7%) (+1.7%) 3.0V < VIN ≤ 5.5V, 1.445 1.545 1.5 0mA ≤ IOUT ≤ 250mA ( −3.7%) (+3%) VOUT = 1.5V VOUT/IOUT Output Load Regulation 0.17 mV/mA 0mA ≤ IOUT ≤ 250mA VOUT/VIN Output Line Regulation 0.1 %/V E Power Efficiency IOUT = 200mA 81 % IQ Quiescent Supply Current IOUT = 0mA (4) 45 50 µA VR Fixed Frequency Output Ripple 40mA ≤ IOUT ≤ 250mA 8 mV VR–PFM PFM–Mode Output Ripple IOUT < 40mA 12 mV ISD Shutdown Current V(EN) = 0V 0.1 0.5 µA FSW Switching Frequency 3.2V ≤ VIN ≤ 5.5V 0.80 1.1 1.40 MHz ROL Open–Loop Output Resistance IOUT = 200mA (5) 1.0 Ω VIN = 5.5V ICL Output Current Limit 500 mA 0V ≤ VOUT ≤ 0.2V (6) tON Turn-on Time 150 µs VIL Logic-low Input Voltage 3.0V ≤ VIN ≤ 5.5V 0 0.5 V VIH Logic-high Input Voltage 3.0V ≤ VIN ≤ 5.5V 0.95 VIN V IIH Logic-high Input Current V(EN) = 1.8V(7) 5 µA IIL Logic-low Input Current Logic Input = 0V 0.1 µA (1) All voltages are with respect to the potential at the GND pins. (2) Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm. (3) CIN, COUT, C1: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. (4) VOUT is set to 1.6V during this test. (5) Open loop output resistance can be used to predict output voltage when, under low VIN and high IOUT conditions, VOUT falls out of regulation. VOUT = VIN/2 − (ROL × IOUT) (6) Maximum input current is equal to half the maximum output current for buck-mode switched capacitor converters. (7) There is a 350k Ω pull-down resistor connected internally between the EN pin and GND. Copyright © 2006, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM2771 |
Аналогичный номер детали - LM2771 |
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Аналогичное описание - LM2771 |
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