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LM3673 Arkusz danych(PDF) 4 Page - Texas Instruments |
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LM3673 Arkusz danych(HTML) 4 Page - Texas Instruments |
4 / 23 page LM3673 SNVS434J – JULY 2006 – REVISED NOVEMBER 2006 www.ti.com Electrical Characteristics (1) (2) (3) 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 LM3673TL with VIN = EN = 3.6V Symbol Parameter Condition Min Typ Max Units VIN Input Voltage (4) 2.7 5.5 V VFB Feedback Voltage (Fixed / ADJ) TL PWM mode (5) -2.5 +2.5 % Line Regulation 2.7V ≤ VIN ≤ 5.5V 0.025 %/V IO = 20 mA Load Regulation 150 mA ≤ IO ≤ 350 mA 0.0015 %/mA VIN= 3.6V VREF Internal Reference Voltage 0.5 V ISHDN Shutdown Supply Current EN = 0V 0.01 1 µA IQ DC Bias Current into VIN No load, device is not switching (FB 16 35 µA forced higher than programmed output voltage) RDSON (P) Pin-Pin Resistance for PFET VIN= VGS= 3.6V 350 450 m Ω RDSON (N) Pin-Pin Resistance for NFET VIN= VGS= 3.6V 150 250 m Ω ILIM Switch Peak Current Limit Open Loop (6) 590 750 855 mA VIH Logic High Input 1.0 V VIL Logic Low Input 0.4 V IEN Enable (EN) Input Current 0.01 1 µA FOSC Internal Oscillator Frequency PWM Mode (5) 1.6 2 2.6 MHz (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 numbers are not guaranteed, but do represent the most likely norm. (3) The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input voltage range refer to datasheet curves. (4) The input voltage range recommended for ideal applications performance for the specified output voltages are given below:VIN = 2.7V to 4.5V for 1.1V ≤ VOUT < 1.5VVIN = 2.7V to 5.5V for 1.5V ≤ VOUT < 1.8VVIN = (VOUT+ VDROPOUT) to 5.5V for 1.8V ≤ VOUT ≤ 3.3Vwhere VDROPOUT = ILOAD *( RDSON, PFET + RINDUCTOR) (5) Test condition: for VOUT less than 2.5V, VIN = 3.6V; for VOUT greater than or equal to 2.5V, VIN = VOUT + 1V. (6) Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic table 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%. Electrical Characteristics (1) (2) (3) Dissipation Rating Table θJA TA≤ 25°C TA= 60°C TA= 85°C Power Rating Power Rating Power Rating 85°C/W (4 layer board) 5-Bump 1179mW 765mW 470mW MicroSMD (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 numbers are not guaranteed, but do represent the most likely norm. (3) The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input voltage range refer to datasheet curves. 4 Submit Documentation Feedback Copyright © 2006, Texas Instruments Incorporated Product Folder Links: LM3673 |
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