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LTC3421 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3421 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  LTC3421 5 3421f Burst Mode Threshold vs RBURST FB Voltage Frequency Accuracy Burst Mode Quiescent Current Current Limit Accuracy RDS(ON) RBURST (kΩ) 20 0 20 60 80 100 INTO BURST OUT OF BURST 120 180 3421 G10 40 70 120 140 160 TEMPERATURE ( °C) –45 1.20 1.21 1.22 1.23 1.24 –30 –15 0 15 3421 G11 30 45 60 75 90 TEMPERATURE ( °C) –45 0.95 0.97 0.99 1.01 1.03 –30 –15 0 15 3421 G12 30 45 60 75 90 TEMPERATURE ( °C) –45 0 5 10 15 20 –30 –15 0 15 3421 G13 30 45 60 75 90 FB (Pin 1): Feedback Pin. Connect resistor divider tap here. The output voltage can be adjusted from 2.4V to 5.25V. The feedback reference voltage is typically 1.220V. SHDN (Pin 2): Shutdown Pin. Less than 0.25V on this pin shuts down the IC. The IC is enabled when the SHDN voltage is greater than 1V. Once VOUT is above 2.2V, hysteresis is applied to the pin (–500nA out of the pin) allowing it to operate at a logic high while the battery can drop to 0.5V. VREF (Pin 3): Buffered 1.22V Reference Output. This pin can source up to 100 µA and sink up to 8µA. This pin must be decoupled with a 0.1 µF capacitor for stability. PI FU CTIO S ENB (Pin 4): Reference Output (VREF) and Low-Battery Comparator Enable. When ENB = Low, the VREF output and low-battery comparator are disabled, which lowers the quiescent current by 5 µA. When ENB = High, the VREF output and the low-battery comparator are enabled. Dur- ing shutdown, if the ENB = High and the output voltage is pulled up to greater than 2.5V from a secondary source such as a coin cell through a Schottky diode, the VREF output and low-battery comparator becomes powered from the output voltage and enabled. TEMPERATURE ( °C) –45 1.20 1.25 1.35 1.40 1.45 1.70 1.55 –15 15 30 90 3421 G14 1.30 1.60 1.65 1.50 –30 0 45 60 75 RLIM = 105k TEMPERATURE ( °C) –45 0 0.02 0.06 0.08 0.10 0.20 0.14 –15 15 30 90 3421 G15 0.04 0.16 0.18 0.12 –30 0 45 60 75 PMOS NMOS TYPICAL PERFOR A CE CHARACTERISTICS (T A = 25°C, unless otherwise specified) |
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Similar Description - LTC3421 |
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