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LM3281 bảng dữ liệu(PDF) 6 Page - Texas Instruments |
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LM3281 bảng dữ liệu(HTML) 6 Page - Texas Instruments |
6 / 26 page LM3281 SNVSA38 – NOVEMBER 2014 www.ti.com 6.6 System Characteristics (1) (2) (3) (4) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ILOAD_MAX (5) Maximum load current 1200 mA VO_RIPPLE_PWM PWM mode VOUT ripple ILOAD = 600 mA 1 mV VO_RIPPLE_ECO ECO mode VOUT ripple ILOAD = 30 mA 60 VO_PWM_ACC PWM mode VOUT 3.2 3.3 3.4 VIN = 3.8 V V VO_ECO_ACC ECO mode VOUT 3.2 3.3 3.4 ITRIG_PWM_TO_ECO PWM to ECO mode ILOAD ILOAD falling 50 threshold mA ITRIG_ECO_TO_PWM ECO to PWM mode ILOAD ILOAD rising 70 threshold VDROPOUT_BYPASS Bypass mode total dropout ILOAD = 600 mA, VIN = 3.2V 60 80 voltage with LSW inductor mV ILOAD = 1200 mA, VIN = 3.2V 120 160 DCR = 40 m Ω ION_SOFT_START Soft-start supply current EN = low-to-high, during turnon averaged in ILOAD ≤ 1 mA 500 1000 mA any 10-µs window TON Turnon transient time from EN = low-to-high, EN = high until VOUT is ILOAD ≤ 1 mA settled to within ±50 mV of 150 µs settled value, and full 1200- mA load may be applied ILOAD = 1200 mA 89% PWM mode efficiency ILOAD = 600 mA 93% η ILOAD = 300 mA 94% ECO mode efficiency ILOAD = 30 mA 91% IQ_CL Closed loop quiescent ILOAD = 0 mA 16 25 µA current VLINE_TR_PWM_PWM (6) ILOAD = 600 mA 20 mVpk PWM-to-PWM line VIN = 4.2 V to 3.8 V TLINE_TR_PWM_PWM (7) transient response VIN = 3.8 V to 4.2 V with 7-µs 0(8) µS edge rate VLOAD_TR_PWM_PWM (6) ILOAD = 150 mA to 600 mA or 80 mVpk PWM-to-PWM load ILOAD = 600 mA to 150 mA with TLOAD_TR_PWM_PWM (7) transient response 3 µS 1-µs edge rate, VIN = 3.8 V VLOAD_TR_ECO_TO_PWM (6) 200 mVpk ECO-to-PWM load ILOAD = 30 mA to 600 mA with transient response 1-µs edge rate, VIN = 3.8 V TLOAD_TR_ECO_TO_PWM (7) 6 µS VIN_RAMP (9) ILOAD = 0 mA Input voltage ramp time Input power supply rising from 20 µs 1.2 V to 2.6 V (1) All voltages are with respect to the GND pin. (2) All TYP characteristics apply to the Simplified Schematic with VIN = 3.8 V, EN = MODE = VIN, at TA = 25°C, device in PWM operation, unless otherwise noted and assume the following passive components: (a) CIN = COUT = Samsung 2.2 µF 0201 case size (PN: CL03A225MQ3CRNC) (b) LSW = Murata 0.47 µH 2012 case size (PN: LQM21PNR47MGH) (c) CLOAD1 = Samsung 10 µF 0402 case size (PN: CL05A106MP5NUNC) (d) CLOAD2 = Samsung 4.7 µF 0402 case size (PN: CL05A475MP5NRNC) (3) All system characteristics are specified by design, test or statistical analysis and are not specified by production testing. (4) Minimum (MIN) and Maximum (MAX) limits apply over the ambient temperature operating range –30°C to 90°C and over the VIN range 3 V to 5.5 V, unless otherwise noted. (5) Refer to section High Maximum Current in this data sheet for load current use case profile. (6) Transient magnitude is defined as maximum deviation from final settled value during transient time. (7) Transient time is defined as time elapsed from the start of the event to when VOUT is finally within ±50 mV of settled value. (8) Transient magnitude does not exceed ± 50 mV of settled value, so transient time is 0 µS. (9) This parameter is only applicable when EN is tied to VIN. See Power-On Reset section for further details. 6 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LM3281 |
Số phần tương tự - LM3281_15 |
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Mô tả tương tự - LM3281_15 |
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