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LP3950SL/NOPB Datasheet(PDF) 14 Page - Texas Instruments |
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LP3950SL/NOPB Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 38 page  LP3950 SNVS331C – NOVEMBER 2004 – REVISED APRIL 2013 www.ti.com Magnetic Boost DC/DC Converter Electrical Characteristics (1) (2) Symbol Parameter Conditions Min Typ Max Units ILOAD Load Current 3.0V ≤ VIN ≤ 4.5V 0 300 mA VOUT = 5.0V VOUT Output Voltage Accuracy 1.0 mA ≤ ILOAD ≤ 300 mA (FB Pin) 3.0V ≤ VIN ≤ 4.5V −5 +5 % VOUT = 5.0V (target value), autoload OFF Output Voltage 1.0 mA ≤ ILOAD ≤ 300 mA (FB Pin) 3.0V < VIN < 5.0V + V(SCHOTTKY), 5.0 V autoload OFF 1.0 mA ≤ ILOAD ≤ 300 mA VIN–V(SCHOTTKY) V VIN > 5V + V(SCHOTTKY) RDSON Switch ON Resistance VDD1,2 = 2.8V, ISW = 0.5A 0.4 0.7 Ω fPWF PWM Mode Switching RT = 82 k Ω 2.0 MHz Frequency freq_sel[2:0] = 1XX Frequency Accuracy 2.7 ≤ VDD1,2 ≤ 2.9 −6 ±3 +6 % RT = 82 k Ω −9 +9 tPULSE Switch Pulse Minimum No Load 25 ns Width tSTARTUP Startup Time 15 ms ICL_OUT SW Pin Current Limit 700 800 900 mA 500 1000 (1) Limits in standard typeface are for TJ = +25°C. Limits in boldface type apply over the operating ambient temperature range (−40°C ≤ TA ≤ +85°C). Unless otherwise noted, specifications apply to Figure 2 with: VDD1 = VDD2 = VDDA = 2.8V, CVDD1 = CVDD2 = CVDDA = CVDDIO = 100 nF, COUT = CIN = 10 µF, CVREF = 100 nF, L1 = 4.7 µH and fBOOST = 2.0 MHz. (2) Low-ESR Surface-Mount Ceramic Capacitors are used in setting electrical characteristics. Boost Standby Mode User can set the boost converter to STANDBY mode by writing the register bit EN_BOOST low when there is no load to avoid idle current consumption. When EN_BOOST is written high, the converter starts in PFM (Pulse Frequency Modulation) mode for 10 ms and then goes to PWM (Pulse Width Modulation ) mode. All RGB outputs are off during the 10 ms delay. Boost Output Voltage Control User can control the boost output voltage by eight-bit boost output voltage register according to the following table. BOOST[7:0] BOOST Output Voltage Register 0D'h (typical) Binary Hex 0000 0000 00 4.10 0000 0001 01 4.25 0000 0011 03 4.40 0000 0111 07 4.55 0000 1111 0F 4.70 0001 1111 1F 4.85 0011 1111 3F 5.00 Default 0111 1111 7F 5.15 1111 1111 FF 5.30 14 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LP3950 |
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