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LTC1844-2.8 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1844-2.8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LTC1844 Series 1844ia When VIN is held constant and VOUT varied, current flow will follow the curves shown in Figure 7. With VOUT held below VOUT(NOM), the LTC1844 will be in current limit trying to pull VOUT up. With VOUT held between VOUT(NOM) and VIN, IIN will be at the normal quiescent current level and IOUT will be 1µA to 2µA. As VOUT is pulled above VIN, IOUT temporarily increases to 30µA until the reverse cur- rent protection circuitry activates and reduces IOUT to less than 10 µA. Alternatively, when VOUT is held constant and VIN varied, current flow will follow Figure 8’s curves. IOUT will be less than 10 µA at all times except for a brief spike just below 2.7V before the reverse current protection circuitry acti- vates. APPLICATIONS INFORMATION Figure 7. Reverse Current vs Output Voltage Figure 8. Reverse Current vs Input Voltage OUTPUT VOLTAGE (V) 0 0 5 15 20 25 50 35 2 4 5 IIN 1844 F07 10 40 45 30 1 3 6 7 LTC1844-2.8 TJ = 25°C VIN = 3.3V CURRENT FLOWS INTO PINS IOUT IN CURRENT LIMIT BELOW 2.8V INPUT VOLTAGE (V) 0 0.5 1.0 1.5 2.0 1844 F08 2.5 100 90 80 70 60 50 40 30 20 10 0 3.0 IOUT IIN LTC1844-2.8 TJ = 25°C VOUT = 2.7V CURRENT FLOW INTO PINS IN CURRENT LIMIT ABOVE 2.7V |
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