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LM3687 Datasheet(PDF) 5 Page - Texas Instruments |
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LM3687 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 30 page LM3687 www.ti.com SNVS473B – DECEMBER 2007 – REVISED MAY 2013 Operating Ratings (1) (2) Input Voltage Range VBATT 2.7V to 5.5V (3) ( ≥VOUT_LIN(NOM) + 1.5V and ≥VOUT_DCDC(NOM) + 1.0V) Input Voltage Range VIN_LIN (VOUT_LIN(NOM) + 0.25V) to 4.5V Junction Temperature (TJ) Range -30°C to + 125°C Ambient Temperature (TA) Range -30°C to + 125°C (4) (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 SGND pin. (3) The battery input voltage range recommended for ideal applications performance for the specified output voltages is given as follows: VBATT = 2.7V to 5.5V for 1.0V < VOUT_DCDC < 1.8V; VBATT = (VOUT_DCDC +1V) to 5.5V for 1.8V ≤ VOUT_DCDC ≤ 1.875V (4) 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), for 4 layer board (1) DSBGA 9 70°C/W (1) Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists, special attention must be paid to thermal dissipation issues in board design. Electrical Characteristics: DC-DC Converter (1) (2) (3) Typical values and limits appearing in standard typeface are for TA = 25°C. Limits appearing in boldface type apply over the full operating temperature range: -30°C ≤ TJ ≤ +125°C. Unless otherwise noted, VIN_LIN = VOUT_LIN(NOM) + 0.3V, VBATT = 3.6V, IOUT_LIN = 1mA, VEN_DCDC = VEN_LIN = VBATT, CVBATT = 4.7µF, CVOUT_DCDC = 10µF, CVOUT_LIN = 2.2µF, CVIN_LIN = 1.0µF, L = 2.2µH. Symbol Parameter Conditions Typical Limit Units Min Max VFB_DCDC Feedback Voltage PWM Mode -2.5 +2.5 % Accuracy Line Regulation VOUT_DCDC + 1.0V ≤ VBATT ≤ 5.5V, IOUT_DCDC = 0.06 %/V 150mA Load Regulation 100mA ≤ IOUT_DCDC ≤ 750mA 0.0005 %/mA RDSON(P) Pin-Pin Resistance for 280 500 m Ω PFET RDSON(N) Pin-Pin Resistance for 200 400 m Ω NFET ILIM_DCDC Switch Peak Current Open loop (4) 1172 994 1380 mA Limit FOSC Internal Oscillator PWM Mode 1.8 1.3 2.3 MHz Frequency (1) All voltages are with respect to the potential at the SGND 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. Unless otherwise specified, conditions for typ. specifications are: VBATT = 3.6V and TA = 25°C. (3) The parameters in the electrical characteristic table are tested at VBATT = 3.6V unless otherwise specified. For performance over the input voltage range refer to datasheet curves. (4) 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%. Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3687 |
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