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LM3631 Arkusz danych(PDF) 6 Page - Texas Instruments |
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LM3631 Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 57 page LM3631 SNVS834 – AUGUST 2014 www.ti.com 7.4 Thermal Information DSBGA THERMAL METRIC(1) UNIT (20 PINS) RθJA Junction-to-ambient thermal resistance 63.5 RθJC Junction-to-case (top) thermal resistance 0.3 RθJB Junction-to-board thermal resistance 9.4 °C/W ΨJT Junction-to-top characterization parameter 1.6 ΨJB Junction-to-board characterization parameter 9.3 (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 7.5 Electrical Characteristics Unless otherwise specified, limits apply over the full operating ambient temperature range ( −40°C ≤ TA ≤ 85°C), VIN = 3.6 V, VPOS = VOREF = 5.4 V, VNEG = –5.4 V, VBST = 5.7 V, VCONT = 3.3V. PARAMETER TEST CONDITION MIN TYP MAX UNIT CURRENT CONSUMPTION ISD Shutdown current nRST = LOW, LCD_EN = LOW 1 µA Quiescent current, device not nRST = HIGH, LCD_EN = LOW, IQ 60 µA switching 2.7 V ≤ VIN ≤ 5 V nRST = HIGH, LCD_EN = HIGH, mA ILCD_EN 2.7 V ≤ VIN ≤ 5 V, no load, 1 Backlight disabled DEVICE PROTECTION VIN decreasing 2.5 V UVLO Undervoltage lockout VIN increasing 2.6 V TSD Thermal shutdown(1) 140 °C TSD(hyst) Hysteresis(1) 20 °C LED CURRENT SINKS Minimum output current Brightness code 0x001 50 µA Brightness code 0x7FF, mA Maximum output current 25 ILED1/2 exponential mapping Brightness code 0x7FF, linear mA Maximum output current 25.3 mapping 2.7 V ≤ VIN ≤ 5.0 V, LED Currents IACCURACY Absolute LED current accuracy (2) –3% 3% 0.05 mA, 1 mA, 5 mA, 25 mA 2.7 V ≤ VIN ≤ 5.0 V, LED Currents IMATCH LED1 to LED2 current matching (2) 0% 3% 0.05 mA, 1 mA, 5 mA, 25 mA VHR_MIN Current sink saturation voltage ILED = 95% of 5 mA 30 50 mV BACKLIGHT BOOST CONVERTER Backlight boost output overvoltage VOVP_BL 2.7 V ≤ VIN ≤ 5 V, 29-V Option 28.8 V protection ILED = 10 mA/string, 2P6S LED ηLED_DRIVE LED drive efficiency (1) configuration 88% 1235AS-H-220M Inductor ILED = 25 mA 250 mV Regulated current sink headroom VHR voltage ILED = 5 mA 100 mV RDSON NMOS switch on resistance ISW = 250 mA 0.5 Ω ICL Selectable NMOS switch current limit 900-mA setting 900 mA (1) Typical value only for reference. (2) Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current. Matching is the maximum difference from the average. For the constant current sinks on the part (LED1 and LED2), the following is determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of both outputs (AVG). Matching number is calculated: (MAX - MIN)/AVG. The typical specification provided is the most likely norm of the matching figure of all parts. LED current sinks were characterized with 1-V headroom voltage. Note that some manufacturers have different definitions in use. 6 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LM3631 |
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