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LM2687 Arkusz danych(PDF) 3 Page - National Semiconductor (TI) |
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LM2687 Arkusz danych(HTML) 3 Page - National Semiconductor (TI) |
3 / 8 page Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V IN to GND or GND to OUT) + 5.8V SD (GND − 0.3V) to (V IN + 0.3V) V NEG and VOUT Continuous Output Current 10mA V OUT Short-Circuit Duration to GND (Note 2) 1 sec. Continuous Power Dissipation (T A = 25˚C) (Note 3) 600mW T JMAX (Note 3) 150˚C θ JA (Note 3) 250˚C/W Operating Input Voltage Range 2.7V to 5.5V Operating Output Current Range 0mA to 10mA Operating Ambient −40˚C to 85˚C Temp. Range Operating Junction Temp. Range −40˚C to 110˚C Storage Temperature −65˚C to 150˚C Lead Temp. (Soldering, 10 sec.) 300˚C ESD Rating (Note 4) 2kV Electrical Characteristics Limits with standard typeface apply for T J = 25˚C, and limits in boldface type apply over the full temperature range. Unless otherwise specified V IN = 3.6V, C1 = C2 = 1µF, C3 = 10µF. Symbol Parameter Conditions Min Typ Max Units I Q Supply Current Open Circuit, No Load 500 950 µA I SD Shutdown Supply Current 0.05 1 µA F SW Switching Frequency (Note 5) 2.7V ≤ V IN ≤.5.5V V IN = 3.6V 50 60 110 105 180 170 kHz η POWER Power Efficiency at V NEG I L = 3.6mA I L = 10mA 94 91 % T START Start Up time (Note 6) 120 600 µs R NEG Output Resistance to V NEG (Note 7) 30 Ω V R Output Voltage Ripple (Note 8) I L =2.5mA, VOUT = −2.7V I L = 10mA, VOUT = −3.8V 1 2 mV V FB Feedback Pin Reference Voltage I L = 2.5mA (Note 9) −1.25 −1.20 −1.15 V V OUT Adjustable Output Voltage 5.5V ≥ V IN ≥ 2.7V, 2.5mA ≥ IL 5.5V ≥ V IN ≥ 3.0V, 10mA ≥ IL ≥ 0mA −(V IN −0.3V) −(V IN −1.2V) V Load Regulation 0 to 10mA, V OUT = − 2.4V 5 mV/mA Line Regulation 5.5V ≥ V IN ≥ 2.7V, IL = 2.5mA 1 mV/V V IH Shutdown Pin Input Voltage High 5.5V ≥ V IN ≥ 2.7V 2.2 V V IL Shutdown Pin Input Voltage Low 5.5V ≥ V IN ≥ 2.7V 0.5 V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: OUT may be shorted to GND for one second without damage. However, shorting OUT to VIN may damage the device and must be avoided. Also, for tem- peratures above TA = 85˚C, OUT must not be shorted to GND or VIN or device may be damaged. Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX (maximum junction temperature), TA (ambient tempera- ture) and θJA (junction-to-ambient thermal resistance). The maximum power dissipation at any temperature is: PDiss MAX = (TJMAX —TA)/θJA up to the value listed in the Absolute Maximum Ratings. Note 4: Rating is for the human body model, a 100pF capacitor discharged through a 1.5 k Ω resistor into each pin. Note 5: The output switches operate at one half the oscillator frequency, fOSC = 2fSW. Note 6: All capacitors are 1µF. Note 7: Current drawn from VNEG pin decreases power efficiency and will increase output voltage ripple. Note 8: In the test circuit, capacitors C1 and C2 are 1µF, C3 = 10µF, 0.30Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, increase output voltage ripple, and reduce efficiency. Note 9: The feedback resistors R1 and R2 are 200k Ω resistors. www.national.com 3 |
Podobny numer części - LM2687 |
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Podobny opis - LM2687 |
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