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LM2794BL Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2794BL Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 16 page Electrical Characteristics (Continued) Limits in standard typeface are for T J = 25˚C and limits in boldface type apply over the full Operating Junction Temperature Range (−30˚C ≤ T J ≤ +100˚C). Unless otherwise specified, C1 = C2 = C IN =CHOLD = 1 µF, VIN = 3.6V, BRGT pin = 0V; RSET =124 Ω ; LM2794:V SD =VIN (LM2795: VSD = 0V). Symbol Parameter Conditions Min Typ Max Units f SW Switching Frequency (Note 6) 3.0V ≤ V IN ≤ 4.4V 325 515 675 kHz 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: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ=150˚C (typ.) and disengages at TJ=140˚C (typ.). D1, D2, D3 and D4 may be shorted to GND without damage. POUT may be shorted to GND for 1sec without damage. Note 3: The value of θJA is based on a two layer evaluation board with a dimension of 2in. x1.5in. Note 4: In the test circuit, all capacitors are 1.0µF, 0.3 Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output voltage and efficiency. Note 5: Voltage at which the device switches from charge-pump mode to pass mode or pass mode to charge-pump mode. For example, during pass mode the device output (Pout) follows the input voltage. Note 6: The output switches operate at one eigth of the oscillator frequency, fOSC = 1/8fSW. www.national.com 4 |
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