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LM3678 Datenblatt(PDF) 4 Page - Texas Instruments |
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LM3678 Datenblatt(HTML) 4 Page - Texas Instruments |
4 / 19 page LM3678 SNVS464C – APRIL 2008 – REVISED MAY 2013 www.ti.com Operating Ratings (1) (2) Input Voltage Range 2.5V to 5.5V Recommended Load Current 0mA to 1.5A Junction Temperature (TJ) Range −30°C to +125°C Ambient Temperature (TA) Range (3) −30°C to +85°C (1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under which the device operates. Operating Ratings do not imply specified performance limits. For specified performance limits and associated test conditions, see the Electrical Characteristics. (2) All voltages are with respect to the potential at the GND pin. (3) In applications with high power dissipation or poor package resistance, the maximum ambient temperature may need to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX), the maximum power dissipation of the device in the application (PD-MAX) and the junction to ambient thermal resistance of the package (θJA) in the application, as given by the following equation: TA-MAX= TJ-MAX− (θJAx PD-MAX). Thermal Properties Junction-to-Ambient Thermal Resistance ( θJA) (DSC-10) for 4-layer board (1) 49.8°C/W (1) Junction-to-ambient thermal resistance is highly application and board layout dependent. In applications where high power dissipation exists, special care must be given to thermal dissipation issues in board design. Electrical Characteristics (1) (2) (3) (4) Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature range ( −30°C ≤ TA ≤ +85°C). Unless otherwise noted, specifications apply to the LM3678 Typical Application Circuit (see Figure 1) with VIN = EN = 3.6V Symbol Parameter Test Conditions Min Typ Max Unit VFB Feedback voltage VSELECT = Low and High -3 +3 % VREF Internal reference voltage 0.5 V RDSON (P) Pin-to-pin resistance for PFET VIN= VGS= 3.6V 150 200 m Ω RDSON (N) Pin-to-pin resistance for NFET VIN= VGS= 3.6V 110 150 m Ω ILIM Switch peak current limit Open loop 1.9 2.15 2.4 A ISHDN Shutdown supply current EN = 0V 1 µA VIH Logic high input for EN and VSELECT VIN = 3.6V 1.2 V VIL Logic low input for EN and VSELECT VIN = 3.6V 0.4 V IEN Enable (EN) input current 0.01 1 µA FOSC Internal oscillator frequency PWM Mode 2.7 3.3 3.6 MHz (1) All voltages are with respect to the potential at the GND pin. (2) Refer to Typical Performance Characteristics for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristics reflects open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current limit is activated). Closed loop current limit is the peak inductor current measured in the application circuit by increasing output current until output voltage drops by 10%. (3) The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input voltage range, see Typical Performance Characteristics. (4) Min and Max limits are specified by design, test or statistical analysis. Typical numbers represent the most likely norm. 4 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LM3678 |
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