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TPS2500 数据表(PDF) 3 Page - Texas Instruments |
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TPS2500 数据表(HTML) 3 Page - Texas Instruments |
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3 / 43 page  TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 Table 1. RECOMMENDED EXTERNAL COMPONENTS MIN NOM MAX UNIT L Inductor (nominal value) 2.2 4.7 mH CIN Input capacitance on IN (ceramic capacitor, X5R, 10V, 0805) 10 mF Boost output capacitance on AUX (ceramic capacitor, X5R, 10V, 1210) 22 CAUX mF Additional AUX capacitance 150 RILIM Current-limit set resistor from ILIM to GND (recommended 1% or better) 16.1 200 k Ω ELECTRICAL CHARACTERISTICS — Shared Boost and USB Section over recommended operating conditions (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT BIAS VIN 13 20 Quiescent VIN = 3.3 V, VAUX = 5.2 V, VEN = VIN, VENUSB = VAUX, mA current IAUX = IUSB = 0 A VAUX 380 480 Shutdown VIN = 3.3 V, VEN = VENUSB = 0 V, AUX and USB OPEN, VIN 4 8 mA current –40°C ≤ TJ ≤ 85°C UVLO Rising 2.08 2.2 Falling 1.69 1.8 After VAUX in Undervoltage lockout threshold on regulation VIN Hysteresis 0.4 V IN for boost converter Falling 1.93 2.05 Before VAUX in regulation Hysteresis 0.15 Rising 4.18 4.3 4.45 Undervoltage lockout threshold on VAUX Falling 4.1 4.21 4.37 V AUX for USB switch Hysteresis 0.09 THERMAL SHUTDOWN Full thermal shutdown threshold 150 Hysteresis 10 °C USB-only thermal shutdown 130 Hysteresis 10 ELECTRICAL CHARACTERISTICS — Boost Section Only over recommended operating conditions (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT APPLICATION SPECIFICATIONS VAUX AUX regulation voltage 4.95 5.1 5.25 V OSCILLATOR Switching frequency, normal mode VIN < VLFM 925 1000 1075 freq kHz Switching frequency, low-frequency mode VIN > VLFM 230 250 270 VIN rising 4.25 4.35 4.45 V VLFM Low-frequency mode input voltage threshold Hysteresis 200 mV VIN rising 4.9 5.05 5.17 V No-frequency mode input voltage threshold VNFM (boost SYNC MOSFET always on) Hysteresis 75 mV Maximum duty cycle 85 % Minimum controllable on-time 85 ns Eco-mode CONTROL SCHEME, PULSED FREQUENCY OPERATION (TPS2500 ONLY) IINDLOW Demanded peak current to enter PFM mode Peak inductor current, falling 420 mA 0.98 × AUXLOW AUX-too-low comparator threshold Resume switching due to AUX, falling V VAUX Copyright © 2008–2010, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): TPS2500 TPS2501 |
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