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TPS60255RTET Datasheet(PDF) 3 Page - Texas Instruments |
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TPS60255RTET Datasheet(HTML) 3 Page - Texas Instruments |
3 / 25 page www.ti.com TPS60255 SLVS825 – MARCH 2008 ELECTRICAL CHARACTERISTICS (continued) VI = 3.5 V, TA = –40°C to 85°C, typical values are at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VENA_H Enable high threshold voltage 1.5 VIN V VENA_L Enable low threshold voltage 0.4 V TS Soft start time(3) 0.5 ms CHARGE PUMP VOUT Overvoltage limit 6.6 V Fs Switching frequency 625 750 875 kHz 1 × Mode, (V IN –VO) ÷ IO 1.0 1.2 RO Open loop output impedance Ω 1.5 × Mode, (V IN × 1.5 – VO) ÷ IO 2.8 3.5 VIN = 3.1 V, IO = 230 mA CURRENT SINK Current matching of Group B at light load TA = 0° to 40°C, IGB_LED = 100 µA × 2 Km_GB ±0.1 ±2 % condition (4) 3.1 V ≤ VIN ≤ 4.2 V, VDX= 0.4 V LED to LED current matching of Group A IGAB_LED = 15.3 mA × 6 Km ±0.1 ±5 % and B (6 LEDs) (4) 3.1V ≤ VIN ≤ 4.2 V ILED = 15.3 mA ±10 Ka Current accuracy % ILED = 1.0 mA, TA = 25°C ±15 Maximum LED current of IG_AB_M VGX = 0.2 V 21.5 25.2 28.9 mA GA1-4 and GB1-2 IGC_M Maximum LED current of GC VGX = 0.2 V 80 mA VDropOut LED Drop out voltage See table note (5) 60 100 mV 1 × Mode to 1.5× mode transition VGX falling, measured on the lowest VTH_GU 105 120 mV threshold voltage(6) VGX , IO = 61 mA 1.5 × mode to 1× mode Measured as VIN-(Vout-VGX_MIN) VTH_GD 520 550 590 mV Transition threshold voltage IO = 61 mA INTERFACE TIMING tStart Start time 3.5 µs High Time Low Bit, tH_LB Signal level on IF pin is > 1.2 V 3.5 300 µs logic 0 detection Low Time Low Bit, tL_LB Signal level on IF pin < 0.4V 2 × t H_LB 600 µs logic 0 detection tL_HB Low Time High Bit, logic 1 detection Signal level on IF pin < 0.4V 3.5 300 µs High Time High Bit, tH_HB Signal level on IF pin is > 1.2 V 2 × t L_HB 600 µs logic 1 detection tEOS End of Stream tEOS 3.5 600 µs Duration of Acknowledge Condition (IF tACKN VIN 2.7 V to 6 V 600 750 µs line pulled low by the device) tvalACK Acknowledge Valid Time 3.5 µs (3) Measurement Condition: From enabling the LED driver to 90% output voltage after VIN is already up. (4) LED current matching is defined as: |(I - IAVG)| max / IAVG (5) Dropout Voltage is defined as VGX (LED cathode) to GND voltage at which current into the LED drops 10% from the LED current at VGX = 0.2 V. (6) As VIN drops, VGX eventually falls below the switchover threshold of 100 mV, and TPS60255 switches to 1.5× mode. See the Operating Principle section for details about the mode transition thresholds. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): TPS60255 |
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