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LM36923YFFR Datasheet(PDF) 5 Page - Texas Instruments |
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LM36923YFFR Datasheet(HTML) 5 Page - Texas Instruments |
5 / 47 page 5 LM36923H www.ti.com SNVSAF3A – FEBRUARY 2016 – REVISED FEBRUARY 2016 Product Folder Links: LM36923H Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated (1) LED Current Matching between strings is given as the worst case matching between any two strings. Matching is calculated as ((ILEDX – ILEDY)/(ILEDX + ILEDY)) × 100. 6.5 Electrical Characteristics Minimum and maximum limits apply over the full operating ambient temperature range ( −40°C ≤ TA ≤ 85°C), typical values are at TA = 25°C, and VIN = 3.6 V (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT BOOST IMATCH (1) LED current matching ILED1 to ILED2 to ILED3 50 µA ≤ ILED ≤ 25 mA, 2.7 V ≤ VIN ≤ 5 V (linear or exponential mode) –1% 0.1% 1% Accuracy Absolute accuracy (ILED1, ILED2, ILED3) 50 µA ≤ ILED ≤ 25 mA, 2.7 V ≤ VIN ≤ 5 V (linear or exponential mode) –3% 0.1% 3% ILED_MIN Minimum LED current (per string) PWM or I2C current control (linear or exponential mode) 50 µA ILED_MAX Maximum LED current (per string) 25 mA RDNL IDAC ratio-metric DNL exponential mode only 1/3 (0.3%) LSB VHR Regulated current sink headroom voltage ILED = 25 mA 210 mV ILED = 5 mA 100 VHR_MIN Current sink minimum headroom voltage ILED = 95% of nominal, ILED = 5 mA 35 50 mV Efficiency Typical efficiency VIN = 3.7 V, ILED = 5 mA/string, Typical Application circuit (3x7 LEDs), (POUT/PIN) 87% RNMOS NMOS switch on resistance ISW = 250 mA 0.29 Ω ICL NMOS switch current limit 2.7 V ≤ VIN ≤ 5 V OCP = 00 575 750 875 mA OCP = 01 860 1000 1110 OCP = 10 1100 1250 1400 OCP = 11 1350 1500 1650 VOVP Output overvoltage protection ON threshold, 2.7 V ≤ VIN ≤ 5 V OVP = 00 16 17 17.5 V OVP = 01 23 24 25 OVP = 10 30 31 32 OVP = 11 37 38 39 OVP Hysteresis 0.5 V ƒSW Switching frequency 2.7 V ≤ VIN ≤ 5 V, boost frequency shift = 0 Boost frequency select = 0 475 500 525 kHz Boost frequency select = 1 950 1000 1050 DMAX Maximum boost duty cycle 92% 94% ISHDN Shutdown current Chip enable bit = 0, SDA = SCL = IN or GND, 2.7 V ≤ VIN ≤ 5 V 1.2 5 µA TSD Thermal shutdown 135 °C Hysteresis 15 PWM INPUT Min ƒPWM 50 Hz Max ƒPWM Sample rate = 24 MHz 50 kHz tMIN_ON Minimum pulse ON time Sample rate = 24 MHz 183.3 ns Sample rate = 4 MHz 1100 Sample rate = 800 kHz 5500 tMIN_OFF Minimum pulse OFF time Sample rate = 24 MHz 183.3 ns Sample rate = 4 MHz 1100 Sample rate = 800 kHz 5500 |
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