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LM27964 Datenblatt(PDF) 4 Page - Texas Instruments |
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LM27964 Datenblatt(HTML) 4 Page - Texas Instruments |
4 / 22 page LM27964 SNOSAL6D – MAY 2005 – REVISED MAY 2013 www.ti.com Electrical Characteristics (1) (2) Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = 3.6V; VDxA = 0.4V; VDxB = 0.4V; VDKEY = 0.4V; RSETA = RSETB = RSETK = 16.9kΩ; BankA, BankB, and DKEY = Fullscale Current; ENA, ENB, ENK Bits = “1”; C1=C2=1.0µF, CIN=COUT=2.2µF; Specifications related to output current(s) and current setting pins (IDxx and ISETx) apply to BankA, BankB and DKEY. (3) Symbol Parameter Condition Min Typ Max Units 3.0V ≤ VIN ≤ 5.5V 13.77 16.83 mA BankA or BankB Full-Scale 15.3 (-10%) (+10%) (%) ENA or ENB = "1", ENK = “0” 3.0V ≤ VIN ≤ 5.5V Output Current Regulation BankA or BankB Half-Scale 7.5 mA BankA or BankB Enabled ENA or ENB = "1", ENK = “0” 2.7V ≤ VIN ≤ 3.0V BankA or BankB Full-Scale 15 mA IDxx ENA or ENB = "1", ENK = “0” 3.0V ≤ VIN ≤ 5.5V Output Current Regulation 52.8 67.2 mA DKEY Full-Scale 60 Keypad Driver Enabled (-12%) (+12%) (%) ENA = ENB = “0”, ENK = “1” 3.2V ≤ VIN ≤ 5.5V 30 RSETA = 8.3kΩ, RSETK = 16.9kΩ DxA Output Current Regulation VLED = 3.6V mA BankA and DKEY Enabled(4) 60 BankA and DKEY Full-Scale DKEY ENA = ENK = “1”, ENB = “0” Gain = 3/2 2.75 Open-Loop Charge Pump Output ROUT Ω Resistance Gain = 1 1 VDxx 1x to 3/2x Gain Transition VDxTH VDxA and/or VDxB Falling 375 mV Threshold IDxx = 95% ×IDxx (nom.) (IDxx (nom) ≈ 15mA) 180 BankA and/or BankB Full-Scale Gain = 3/2, ENA and/or ENB = "1" Current Source Headroom Voltage VHR mV Requirement(5) IDKEY = 95% ×IDKEY (nom.) (IDKEY (nom) ≈ 60mA) 180 DKEY Full-Scale Gain = 3/2, ENK = "1" IDxx-MATCH LED Current Matching See(6) 0.2 2 % IQ Quiescent Supply Current Gain = 1.5x, No Load 1.3 1.7 mA ISD Shutdown Supply Current All ENx bits = "0" 3.0 5 µA VSET ISET Pin Voltage 2.7V ≤ VIN ≤ 5.5V 1.25 V IDxA-B / Output Current to Current Set Ratio 200 ISETA-B BankA and BankB IDKEY / Output Current to Current Set Ratio 800 ISETK DKEY fSW Switching Frequency 500 700 900 kHz tSTART Start-up Time POUT = 90% steady state 250 µs (1) All voltages are with respect to the potential at the GND pin. (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, CPOUT, C1, and C2 : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics (4) The maximum total output current for the LM27964 should be limited to 180mA. The total output current can be split among any of the three banks (IDxA = IDxB = 30mA Max., IDKEY = 80mA Max.). Under maximum output current conditions, special attention must be given to input voltage and LED forward voltage to ensure proper current regulation. See the Maximum Output Current section of the datasheet for more information. (5) For each IDxx output pin, headroom voltage is the voltage across the internal current sink connected to that pin. For Group A and B outputs, VHR = VOUT -VDxx. If headroom voltage requirement is not met, LED current regulation will be compromised. (6) For the two groups of outputs on a part (BankA and BankB), the following are determined: the maximum output current in the group (MAX), the minimum output current in the group (MIN), and the average output 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 bank. The matching figure for a given part is considered to be the highest matching figure of the two banks. The typical specification provided is the most likely norm of the matching figure for all parts. 4 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM27964 |
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