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LM3554 数据表(PDF) 4 Page - Texas Instruments |
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LM3554 数据表(HTML) 4 Page - Texas Instruments |
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4 / 43 page  LM3554 SNVS549A – JUNE 2009 – REVISED APRIL 2011 www.ti.com Operating Ratings (1) (2) VIN 2.5V to 5.5V Junction Temperature (TJ) -30°C to +125°C Ambient Temperature (TA) (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 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 table. (2) All voltages are with respect to the potential at the GND pin. (3) In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = +125°C), 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), TMD16 Package (1) 60°C/W (1) Junction-to-ambient thermal resistance ( θJA) is taken from a thermal modeling result, performed under the conditions and guidelines set forth in the JEDEC standard JESD51-7. The test board is a 4-layer FR-4 board measuring 102mm x 76mm x 1.6mm with a 2x1 array of thermal via's. The ground plane on the board is 50mm x 50mm. Thickness of copper layers are 36µm/18µm/18µm/36µm (1.5oz/1oz/1oz/1.5oz). Ambient temperature in simulation is 22°C, still air. Power dissipation is 1W. Electrical Characteristics Limits in standard typeface are for TA = +25°C. Limits in boldface type apply over the full operating ambient temperature range (-30°C ≤ TA ≤ +85°C). Unless otherwise specified, VIN = 3.6V, VHWEN = VIN. (1) (2) Symbol Parameter Conditions Min Typ Max Units Current Source Specifications 600mA Flash ILED1+ILED2 1128 1200 1284 LED Setting, ILED1 or ILED2 541 600 657 VOUT = VIN Current Source ILED mA Accuracy 17mA Torch Current Setting, ILED1+ILED2 30.4 33.8 37.2 VHR = 500mV Current Source Regulation VHR 600mA setting, VOUT = 3.75V 300 mV Voltage (VOUT - VLED) LED Current IMATCH 600mA setting, VLED = 3.2V 0.35 % Matching Step-Up DC/DC Converter Specifications Output Voltage 2.7V ≤ VIN ≤ 4.2V, IOUT = 0mA, VREG 4.8 5 5.2 V Accuracy VENVM = VIN, OV bit = 0 Output Over- On Threshold, 2.7V ≤ VIN ≤ 5.5V 5.4 5.6 5.7 Voltage VOVP V Protection Trip Off Threshold 5.3 Point(3) PMOS Switch RPMOS IPMOS = 1A 150 m Ω On-Resistance NMOS Switch RNMOS INMOS = 1A 150 m Ω On-Resistance (1) All voltages are with respect to the potential at the GND pin. (2) Min and Max limits are guaranteed by design, test, or statistical analysis. Typical (Typ) numbers are not guaranteed, but do represent the most likely norm. Unless otherwise specified, conditions for typical specifications are: VIN = 3.6V and TA = +25°C. (3) The typical curve for Over-Voltage Protection (OVP) is measured in closed loop using the typical application circuit . The OVP value is found by forcing an open circuit in the LED1 and LED2 path and recording the peak value of VOUT. The value given in the Electrical Table is found in an open loop configuration by ramping the voltage at OUT until the OVP comparator trips. The closed loop data can appear higher due to the stored energy in the inductor being dumped into the output capacitor after the OVP comparator trips. At worst case is an open circuit condition where the output voltage can continue to rise after the OVP comparator trips by approximately IIN×sqrt(L/COUT). 4 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated Product Folder Links: LM3554 |
类似零件编号 - LM3554_14 |
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类似说明 - LM3554_14 |
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