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LTC1645CS8 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1645CS8 Datasheet(HTML) 6 Page - Linear Technology |
6 / 24 page 6 LTC1645 (14-Lead Package/8-Lead Package) Whenever the timer is inactive, an internal N-channel FET shorts the TIMER pin to ground. Activating the timer connects a 2 µA current source from VCC1to the TIMER pin and the voltage starts to ramp up with a slope dv/dt = 2 µA/ CTIMER. When the voltage reaches the trip point (1.23V), the timer is reset by pulling the TIMER pin back to ground. The timer period is (1.23V • CTIMER)/2µA. GATE1 (Pin 12/Pin 6): Channel 1 High Side Gate Drive. Connect to the gate of an external N-channel MOSFET. An internal charge pump guarantees at least 4.5V of gate drive. The charge pump is powered by the higher of VCC1 and VCC2. When the ON pin exceeds 0.8V, GATE1 is turned on by connecting a 10 µA current source from the charge pump output to the GATE1 pin and the voltage starts to ramp up with a slope dv/dt = 10 µA/CGATE1. While the ON pin is below 0.8V but above 0.4V, a 40 µA current source pulls GATE1 toward ground. If the ON pin is below 0.4V, the circuit breaker trips or the undervoltage lockout circuit trips, the GATE1 pin is immediately pulled to ground with a 12mA (typ) current source. SENSE1 (Pin 13/Pin 7): VCC1 Circuit Breaker Set Pin. With a sense resistor placed in the supply path between VCC1 and SENSE1, the circuit breaker trips when the voltage across the resistor exceeds 50mV for more than 1.5 µs. If the circuit breaker trip current is set to twice the normal operating current, only 25mV is dropped across the sense resistor during normal operation. To disable the circuit breaker, short VCC1 and SENSE1 together. VCC1 (Pin 14/Pin 8): Positive Supply Input. VCC1 can range from 2.375V to 12V for normal operation. ICC1 is typically 1mA. An undervoltage lockout circuit disables the chip whenever the voltage at VCC1 is less than 2.23V. All internal logic is powered by VCC1. + – + – + – + – 2.23V UVL 2V ON 0.8V 0.4V REF 1.5 µs FILTER 1.12V UVL 1.5 µs FILTER LOGIC GLITCH FILTER REF REF 4 × CHARGE PUMP 1.238V REFERENCE 50mV 50mV 2 µA + – + – 10 VCC1 14 SENSE1 13 VCC2 1 SENSE2 2 GATE1 12 GATE2 3 FB 6 RESET 5 GND 7 COMP+ 8 COMPOUT 9 FAULT 4 1645 BD TIMER 11 PI FU CTIO S BLOCK DIAGRA |
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