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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP8754 датащи(PDF) 8 Page - Texas Instruments |
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LP8754 датащи(HTML) 8 Page - Texas Instruments |
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8 / 53 page  LP8754 SNVS861A – FEBRUARY 2014 – REVISED AUGUST 2014 www.ti.com 6-Phase Buck Electrical Characteristics (continued) Limits apply over the full ambient temperature range -40°C ≤ TA ≤ 85°C, VVDDA5V = VVINBXX = 3.7 V, VVIOSYS = VNRST = 1.8 V, VOUT = 1.1 V, (unless otherwise noted). SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ILIMITP High side switch current limit 2.5 A register setting 2050 2600 3300 mA ILIMITN Low side switch current limit Reverse current 650 900 1050 VOUT Output voltage Range, Programmable by register setting 0.6 1.0 1.67 V Step 10 mV fSW Switching frequency 2.5 V ≤ VVINBXX ≤ 5 V 2.7 3.0 3.4 MHz Test Current = 200 mA; Split FET 120 RDSON_P Pin-pin resistance for PFET Test Current = 200 mA; Full FET 60 m Ω RDSON_N Pin-pin resistance for NFET IOUT = –200 mA 50 ILK_HS High-side leakage current VSW = 0 V, Per Buck Core 2 µA ILK_LS Low-side leakage current VSW = 3.7 V = VVINBXX, Per Buck Core 2 Enabled via control register, Active only RPD Pull-down resistor 250 Ω when converter disabled, Per Buck Core Differential feedback Input RIN_FB TA = 25°C 200 300 400 k Ω resistance (3) (3) Datasheet min/max specification limits are specified by design. 6.7 6-Phase Buck System Characteristics Limits apply over the full ambient temperature range -40°C ≤ TA ≤ 85°C, VVDDA5V = VVINBXX = 3.7 V, VVIOSYS = VNRST = 1.8 V, VOUT = 1.1 V, (unless otherwise noted). SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Programmable via control register (1) RAMP_B0[2:0] = 000 30 RAMP_B0[2:0] = 001 15 RAMP_B0[2:0] = 010 7.5 KRAMP Ramp timer RAMP_B0[2:0] = 011 3.8 mV/µs RAMP_B0[2:0] = 100 1.9 RAMP_B0[2:0] = 101 0.94 RAMP_B0[2:0] = 110 0.47 RAMP_B0[2:0] = 111 0.23 TSTART Start-up time Time from NRST-HIGH to start of switching 25 µs TRAMP VOUT rise time Time to ramp from 5% to 95% of VOUT 20 µs Average output current, programmable via control register, VOUT = 1.1 V (2) PFM_EXIT_B0[2:0] = 011 175 PFM-to-PWM switch–over current PFM_EXIT_B0[2:0] = 100 225 IPFM–PWM mA threshold PFM_EXIT_B0[2:0] = 101 275 PFM_EXIT_B0[2:0] = 110 325 PFM_EXIT_B0[2:0] = 111 375 (1) In the real application, achievable output voltage ramp profiles are influenced by a number of factors, including the amount of output capacitance, the load current level, the load characteristic (either resistive or constant-current), and the voltage ramp amplitude. Typical values are measured with typical conditions. (2) The final PFM-to-PWM and PWM-to-PFM switchover current varies slightly and is dependant on the output voltage, input voltage, and the inductor current level. Typical values are measured with typical conditions. 8 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LP8754 |
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