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LTC1474CS8-5 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1474CS8-5 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 20 page  5 LTC1474/LTC1475 FUNCTIONAL DIAGRA LTC1474: LBI LTC1475: LBI/OFF – + – + – + × 1 µA LBI/OFF LBO 4.75 µs 1-SHOT 1.23V REFERENCE GND 1474/75 FD 4 2 8 1.23V 1M 3M (5V VERSION) 1.68M (3.3V VERSION) READY STRETCH VCC VIN VIN VOUT VOUT/VFB 1 × C ON V LB ON 5 Ω SW SENSE RSENSE (OPTIONAL) 20 × 100mV WAKEUP TRIGGER OUT LTC1474: RUN LTC1475: ON 1 5 6 7 + + × CONNECTIONNOTPRESENTINLTC1474SERIES CONNECTION PRESENT IN LTC1474 SERIES ONLY 3 OUTPUT DIVIDER IS IMPLEMENTED EXTERNALLY IN ADJUSTABLE VERSIONS PIN FUNCTIONS VOUT/VFB (Pin 1): Feedback of Output Voltage. In the fixed versions, an internal resistive divider divides the output voltage down for comparison to the internal 1.23V refer- ence. In the adjustable versions, this divider must be implemented externally. LBO (Pin 2): Open Drain Output of the Low Battery Comparator. This pin will sink current when Pin 3 is below 1.23V. LBI/OFF (Pin 3): Input to Low Battery Comparator. This input is compared to the internal 1.23V reference. For the LTC1475, a momentary ground on this pin puts regulator in shutdown mode. GND (Pin 4): Ground Pin. SW (Pin 5): Drain of Internal PMOS Power Switch. Cath- ode of Schottky diode must be closely connected to this pin. SENSE (Pin 6): Current Sense Input for Monitoring Switch Current and Source of Internal PMOS Power Switch. Maximum switch current is programmed with a resistor between SENSE and VIN pins. VIN (Pin 7): Main Supply Pin. RUN/ON (Pin 8): On LTC1474, voltage level on this pin controls shutdown/run mode (ground = shutdown, open/ high = run). On LTC1475, a momentary ground on this pin puts regulator in run mode. A 100k series resistor must be used between Pin 8 and the switch or control voltage. |
Similar Part No. - LTC1474CS8-5 |
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Similar Description - LTC1474CS8-5 |
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