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LM27964SQX-A Folha de dados(PDF) 4 Page - National Semiconductor (TI) |
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LM27964SQX-A Folha de dados(HTML) 4 Page - National Semiconductor (TI) |
4 / 13 page Electrical Characteristics (Notes 2, 8) (Continued) Limits in standard typeface are for T J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un- less otherwise specified: V IN = 3.6V; VDxA = 0.4V; VDxB = 0.4V; VDKEY = 0.4V; RSETA =RSETB =RSETK = 16.9k Ω; BankA, BankB, and DKEY = Fullscale Current; ENA, ENB, ENK Bits = “1”; C1=C2=1.0µF, C IN=COUT=2.2µF; Specifications related to output current(s) and current setting pins (I Dxx and ISETx) apply to BankA, BankB and DKEY. (Note 9) Symbol Parameter Condition Min Typ Max Units V HR Current Source Headroom Voltage Requirement (Note 11) I Dxx = 95% xIDxx (nom.) (I Dxx (nom) ≈ 15mA) BankA and/or BankB Full-Scale Gain = 3/2, ENA and/or ENB = "1" 180 mV I DKEY = 95% xIDKEY (nom.) (I DKEY (nom) ≈ 60mA) DKEY Full-Scale Gain = 3/2, ENK = "1" 180 I Dxx-MATCH LED Current Matching (Note 12) 0.2 2 % I Q Quiescent Supply Current Gain = 1.5x, No Load 1.3 1.7 mA I SD Shutdown Supply Current All ENx bits = "0" 3.0 5 µA V SET I SET Pin Voltage 2.7V ≤ V IN ≤ 5.5V 1.25 V I DxA-B / I SETA-B Output Current to Current Set Ratio BankA and BankB 200 I DKEY / I SETK Output Current to Current Set Ratio DKEY 800 f SW Switching Frequency 500 700 900 kHz t START Start-up Time P OUT = 90% steady state 250 µs f PWM Internal Diode Current PWM Frequency LM27964SQ-I 10 kHz LM27964SQ-A 23 D.C. Step Diode Current Duty Cycle Step 1/16 Fullscale I 2C Compatible Interface Voltage Specifications (SCL, SDIO, VIO) V IO Serial Bus Voltage Level 1.8 V IN V V IL Input Logic Low "0" 2.7V ≤ V IN ≤ 5.5V 0 0.27 x V IO V V IH Input Logic High "1" 2.7V ≤ V IN ≤ 5.5V 0.73 x V IO V IO V V OL Output Logic Low "0" I LOAD = 2mA 400 mV I 2C Compatible Interface Timing Specifications (SCL, SDIO, VIO)(Note 13) t 1 SCL (Clock Period) 2.5 µs t 2 Data In Setup Time to SCL High 100 ns t 3 Data Out stable After SCL Low 0 ns t 4 SDIO Low Setup Time to SCL Low (Start) 100 ns t 5 SDIO High Hold Time After SCL High (Stop) 100 ns 20138113 www.national.com 4 |
Nº de peça semelhante - LM27964SQX-A |
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Descrição semelhante - LM27964SQX-A |
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