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LM3370 Arkusz danych(PDF) 5 Page - National Semiconductor (TI) |
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LM3370 Arkusz danych(HTML) 5 Page - National Semiconductor (TI) |
5 / 23 page Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V IN1 ,VIN2 VDD to PGND & SGND −0.2V to 6V PGND to SGND -0.2V to +0.2V SDA, SCL, EN, EN2, nPOR1, nPOR2, SW1, SW2, FB1 & FB2 (GND - 0.2) to (V IN + 0.2V) Maximum Continuous Power Dissipation (P D_MAX) (Note 3) Internally Limited Junction Temperature (T J-MAX) 125˚C Storage Temperature Range −65˚C to +150˚C Maximum Lead Temperature (Soldering) (Note 4) ESD Ratings (Note 5) All Pins 2 kV HBM 200V MM Operating Ratings (Notes 1, 2) Input Voltage Range ((Note 10)) 2.7V to 5.5V Recommended Load Current Per Channel 0mA to 600mA Junction Temperature (T J) Range −30˚C to +125˚C Ambient Temperature (T A) Range (Note 6) −30˚C to +85˚C Thermal Properties (Note 7) Junction-to-Ambient Thermal Resistance ( θ JA) 26˚C/W Electrical Characteristics (Notes 2, 8, 10)Typical limits appearing in normal type apply for T J = 25˚C. Lim- its appearing in boldface type apply over the entire junction temperature range (T A =TJ = −30˚C to +85˚C). Unless otherwise noted, V IN1 =VIN2 = 3.6V. Symbol Parameter Conditions Min Typ Max Units V FB Feedback Voltage (Note 11) -3.5 +3.5 % V OUT Line Regulation 2.7V ≤ V IN ≤ 5.5V I O = 10mA, VOUT = 1.8V 0.031 %/V Load Regulation 100mA ≤ I O ≤ 600mA V IN = 3.6V, VOUT = 1.8V 0.0013 %/mA I Q PFM Quiescient Current “On” PFM Mode, Both Bucks ON 34 µA I Q SD Quiescient Current “Off” EN1 = EN2 = 0V 0.2 3 µA I LIM Peak Switching Current Limit V IN = 3.6V 850 1200 1400 mA R DS_ON PFET V IN = 3.6V, ISW = 200mA 390 500 m Ω NFET V IN = 3.6V, ISW = 200mA 240 350 F OSC Internal Oscillator Frequency 1.5 2.0 2.4 MHz I EN Enable (EN) Input Current 0.01 1 µA V IL Enable Logic Low 0.4 V V IH Enable Logic High 1.0 V POWER ON RESET THRESHOLD/FUNCTION (POR) nPOR1 & nPOR2 Delay Time nPOR1 = Power ON Reset for Buck 1 50 mS (default) 50 mS nPOR2 = Power ON Reset for Buck 2 Can be pre-trimmd to 50 uS, 100 mS & 200 mS POR Threshold Percentage of Target V OUT V OUT Rising 94 % V OUT Falling, 85% (default), Can be pre-trimmed to 70% or 94% 85 Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: All voltages are with respect to the potential at the GND pin. Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. The thermal shutdown engages at TJ = 150˚C (typ.) and disengages at TJ = 140˚C(typ.). Note 4: For detailed soldering specifications and information, please refer to National Semiconductor Application Note 1187: Leadless Leadframe Package (LLP) (AN-1187). Note 5: The Human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. (MIL-STD-883 3015.7) The machine model is a 200 pF capacitor discharged directly into each pin. (EAIJ) www.national.com 5 |
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