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LM3552 bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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LM3552 bảng dữ liệu(HTML) 4 Page - Texas Instruments |
4 / 23 page LM3551, LM3552 SNVS371C – AUGUST 2005 – REVISED MARCH 2011 www.ti.com Electrical Characteristics (1) (2) Limits in standard typeface are for TJ = +25° C. Limits in boldface type apply over the full operating junction temperature range (-40°C ≤ TJ ≤ +110°C). Unless otherwise noted, specifications apply to the LM3551 and LM3552 Typical Application Circuit (pg. 1) with: VIN = 3.6V, V(SD) = 0V for LM3551 and V(EN) = VIN for LM3552, ILOAD = 0A (3) Symbol Parameter Conditions Min Typ Max Units IQ Quiescent Current FB = VIN (Not Switching) 1.47 2.0 mA V(SD) = VIN, LM3551 2.55 5.0 ISD Shutdown Current µA V(EN) = 0V, LM3552 0.1 2.3 ICL (4) Switch Current Limit VIN = 3.0V (5) 2.1 A VFB Feedback Voltage 1.2285 1.265 1.2915 V IFB (6) Feedback Pin Bias Current 50 nA gm Error Amp Transconductance ΔI = 5µA 135 µmho AV Error Amp Voltage Gain 135 V/V DMAX Maximum Duty Cycle 92.5 % fsw Switching Frequency 0.9 1.25 1.6 MHz Shutdown Pin Current ISDPIN VSD = 0V 3.0 6 µA (LM3551) Enable Pin Current IENPIN VEN = 3.6V 3.0 6 µA (LM3552) VT/F = 0V 26 IT/FPIN T/F Pin Current nA VT/F = VIN 22 IL-SW SW Pin Leakage Current VL-SW = 20V 0.07 8 µA RDSON-SW SW Pin RDSON ISW = 0.5A 0.165 Ω IL-T FET-T Leakage Current 0.1 µA RDSON-T FET-T RDSON 0.98 Ω IL-F FET-F Leakage Current 0.1 µA RDSON-F FET-F RDSON 0.36 Ω Output High 1.2 Shutdown/Enable Pin ThSD/EN V Threshold Output Low 0.3 Output High 1.2 ThT/F T/F Pin Threshold V Output Low 0.3 On Threshold 2.25 2.48 2.70 Under Voltage Protection UVP V Thresholds Off Threshold 2.43 2.58 2.77 On Threshold 11.3 12.4 14 Over Voltage Protection OVP V Thresholds Off Threshold 9.2 10.6 12 VFTO Flash Timeout trip-point 0.99 1.16 1.32 V IFTO Flash Timeout Current 1.12 1.4 1.68 µA VSS Soft-Start Voltage 1.18 1.25 1.32 V ISS Soft-Start Current 10 11.5 13 µA (1) All voltages are with respect to the potential at the GND pin. (2) Min and Max limits are guaranteed by design, test, or statistical analysis. Typical (Typ) numbers are not guaranteed, but do represent the most likely norm. Unless otherwise specified, conditions for Typ specifications are: VIN = 3.6V and TA = 25ºC. (3) CIN and COUT,: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics (4) Duty cycle affects current limit due to ramp generator. (5) Current limit at 0% duty cycle. See TYPICAL PERFORMANCE section for Switch Current Limit vs. VIN (6) Bias current flows into FB pin. 4 Submit Documentation Feedback Copyright © 2005–2011, Texas Instruments Incorporated Product Folder Links: LM3551 LM3552 |
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Mô tả tương tự - LM3552 |
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