Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3538 Datenblatt(PDF) 5 Page - Texas Instruments |
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LM3538 Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 31 page LM3538 www.ti.com SNVS674A – JUNE 2011 – REVISED MAY 2013 Charge Pump and LED Drivers Electrical Characteristics (1) (2) Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the operating ambient temperature range ( −30°C to +85°C). Unless otherwise specified: VIN_A = 3.6V; VHWEN = VIN_A; VDx = 0.4V; Group A = Group B = Fullscale Current; C1 = C2 = CIN_A = COUT = 1.0µF. (3) Symbol Parameter Condition Min Typ Max Units Output Current Regulation 2.7V ≤ VIN_A ≤ 5.5V −7.5% 25 +7.5% mA GroupA 6 LEDs in Group A Output Current Regulation 2.7V ≤ VIN_A ≤ 5.5V −7.5% 25 +7.5% mA GroupB 2 LEDs in Group B IDx 3.2V ≤ VIN_A ≤ 5.5V Output Current Regulation VLED = 3.6V 22.3 All LED Drivers Enabled mA BankA current code = 1111101b, exp dimming DxA All LED Drivers on BankA(4) scale 2.7V ≤ VIN ≤ 5.5V Group A (6 LEDs) 0.8 3 IDx- LED Current Matching(5) LED Current = % MATCH Group B (2 LEDs) 0.4 3 Fullscale current VDxTH VDx 1x to 3/2x Gain Transition Threshold VDx Falling 135 mV Current sink Headroom Voltage IDx = 95% ×IDx (nom.) VHR 100 mV Requirement(6) (IDx (nom) ≈ 20mA) Gain = 3/2 2.4 Open-Loop Charge Pump Output ROUT Ω Resistance(7) Gain = 1 0.5 Gain = 1.5x, No Load. Current through VIN_A 2.9 4.4 pin. Sensor Bias OFF IQ Quiescent Supply Current mA Gain = 1x, No Load. Current through VIN_A 1.1 2.4 pin. Sensor Bias OFF HWEN = 1.8V. All registers in factory defaults ISB Standby Supply Current 1.2 µA state. Current through VIN_A pin. ISD Shutdown Supply Current HWEN = 0V. Current through VIN_A pin. 0.2 1.0 µA fSW Switching Frequency 1.1 1.3 1.6 MHz tSTART Start-up Time See(8) 250 µs VALS ALS Reference Voltage −6% 1.0 +6% V RALS register setting = 00010b −6% 10.1 +6% RALS Internal ALS Resistor k Ω RALS register setting = 00100b −6% 5.0 +6% (1) All voltages are with respect to the potential at the GND pins. (2) Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most likely norm. (3) CIN_X, COUT, CLDOX, CSEN, C1, and C2 : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. (4) The total output current can be split between the two groups (IDx = 25mA Max). Under maximum output current conditions, special attention must be given to input voltage and LED forward voltage to ensure proper current regulation. The maximum total output current for the LM3538 should be limited to 150mA. (5) For the two groups of current sinks on a part (Group A and Group B), the following are determined: the maximum sink current in the group (MAX), the minimum sink current in the group (MIN), and the average sink current of the group (AVG). For each group, two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered the matching figure for the group. The matching figure for a given part is considered to be the highest matching figure of the two groups. The typical specification provided is the most likely norm of the matching figure for all parts. (6) For each Dxpin, headroom voltage is the voltage across the internal current sink connected to that pin. For Group A and B current sinks, VHRx = VOUT -VLED. If headroom voltage requirement is not met, LED current regulation will be compromised. (7) Specified by design. (8) Turn-on time is measured from the moment the charge pump is activated until the VOUT crosses 90% of its target value. Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3538 |
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