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LT1579CGN-3.3 Datasheet(PDF) 4 Page - Linear Technology |
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LT1579CGN-3.3 Datasheet(HTML) 4 Page - Linear Technology |
4 / 20 page 4 LT1579 ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Adjust Pin Bias Current TJ = 25°C 630 nA (Notes 2, 7) Minimum Input Voltage ILOAD = 0mA q 2.7 3.2 V (Note 8) Minimum Load Current LT1579 VIN1 = VIN2 = 3.2V q 3 µA Secondary Select Switch from VIN2 to VIN1 q 1.2 2.8 V Threshold Switch from VIN1 to VIN2 q 0.25 0.75 V Secondary Select Pin VSS = 0V q 1 1.5 µA Current (Note 7) Low-Battery Trip Threshold VIN1 = VIN2 = VOUT(NOMINAL) + 1V, High-to-Low Transition q 1.440 1.500 1.550 V Low-Battery Comparator VIN1 = VIN2 = 6V, ILBO = 20µA (Note 11) q 18 30 mV Hysteresis Low-Battery Comparator VIN1 = VIN2 = 6V, VLBI = 1.4V, TJ = 25°C2 5 nA Bias Current (Notes 7, 10) Logic Flag Output Voltage ISINK = 20µA q 0.17 0.45 V ISINK = 5mA q 0.97 1.3 V Ripple Rejection VIN1 – VOUT = VIN2 – VOUT = 1.2V (Avg), VRIPPLE = 0.5VP-P 55 70 dB fRIPPLE = 120Hz, ILOAD = 150mA Current Limit VIN1 = VIN2 = VOUT(NOMINAL) + 1V, ∆VOUT = – 0.1V q 320 400 mA Input Reverse Leakage VIN1 = VIN2 = –20V, VOUT = 0V q 1.0 mA Current Reverse Output Current LT1579-3 VOUT = 3V, VIN1 = VIN2 = 0V 3 12 µA LT1579-3.3 VOUT = 3.3V, VIN1 = VIN2 = 0V 3 12 µA LT1579-5 VOUT = 5V, VIN1 = VIN2 = 0V 3 12 µA The q denotes specifications which apply over the full operating temperature range. Note 1: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, output current must be limited. When operating at maximum output current, the input voltage range must be limited. Note 2: The LT1579 (adjustable version) is tested and specified with the adjust pin connected to the output pin and a 3 µA DC load. Note 3: Dropout voltage is the minimum input-to-output voltage differential required to maintain regulation at the specified output current. In dropout, the output voltage will be equal to VIN – VDROPOUT. Note 4: To meet the requirements for minimum input voltage, the LT1579 (adjustable version) is connected with an external resistor divider for a 3.3V output voltage (see curve of Minimum Input Voltage vs Temperature in the Typical Performance Characteristics). For this configuration, VOUT(NOMINAL) = 3.3V. Note 5: Ground pin current will rise at TJ > 75°C. This is due to internal circuitry designed to compensate for leakage currents in the output transistor at high temperatures. This allows quiescent current to be minimized at lower temperatures, yet maintain output regulation at high temperatures with light loads. See the curve of Quiescent Current vs Temperature in the Typical Performance Characteristics. Note 6: Standby current is the minimum quiescent current for a given input while the other input supplies the load and bias currents. Note 7: Current flow is out of the pin. Note 8: Minimum input voltage is the voltage required on either input to maintain the 1.5V reference for the error amplifier and low-battery comparators. Note 9: Total quiescent current in shutdown will be approximately equal to IVIN1 + IVIN2 – ISRC. Both IVIN1 and IVIN2 are specified for worst-case conditions. IVIN1 is specified under the condition that VIN1 > VIN2 and IVIN2 is specified under the condition that VIN2 > VIN1. ISRC is drawn from the highest input voltage only. For normal operating conditions, the quiescent current of the input with the lowest input voltage will be equal to the specified quiescent current minus ISRC. For example, if VIN1 = 20V, VIN2 = 6V then IVIN1 = 5µA and IVIN2 = 5µA – 3µA = 2µA. Note 10: The specification applies to both inputs independently (LBI1, LBI2). Note 11: Low-battery comparator hysteresis will change as a function of current in the low-battery comparator output. See the curve of Low-Battery Comparator Hysteresis vs Sink Current in the Typical Performance Characteristics. |
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