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LTC1174IN8 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1174IN8 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  5 LTC1174 LTC1174-3.3/LTC1174-5 CC HARA TERISTICS A TYPICALPERFOR CE Supply Current in Shutdown Switch Resistance vs Input Voltage INPUT VOLTAGE (V) 0 8 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1174 G11 414 2 6 10 12 SHUTDOWN = 0V TA = 25°C CURRENT INTO PIN 6 ONLY INPUT VOLTAGE (V) 5 7 9 10 14 1174 G10 68 11 12 13 95 94 93 92 91 90 89 VOUT = 5V L = 100 µH COIL = CTX100-4 ILOAD = 300mA IPGM = VIN ILOAD = 100mA IPGM = 0V Efficiency vs Input Voltage DC Supply Current INPUT VOLTAGE (V) 0 500 450 400 350 300 250 200 150 100 50 0 4 8 10 1174 G12 2 6 12 14 ACTIVE MODE IPGM = VIN SLEEP MODE IPGM = 0V TA = 25°C Operating Frequency vs VIN – VOUT (VIN – VOUT) VOLTAGE (V) 0 9 1174 G13 2 57 2.0 1.5 1.0 0.5 0 1 3 4 6 8 VOUT = 5V TA = 25°C TA = 70°C Off-Time vs Output Voltage SW(Pin5): Drain of the P-Channel MOSFETSwitch. Cathode of Schottky diode must be closely connected to this pin. VIN (Pin 6): Input Supply Voltage. It must be decoupled close to ground pin 4. IPGM (Pin 7): Selects the Current Limit of the P-Channel Switch. With IPGM = VIN, the current trip point is 600mA and with IPGM = 0V, the current trip value is reduced to 340mA. SHUTDOWN (Pin 8): Pulling this pin to ground keeps the internal switch off and puts the LTC1174 in micropower shutdown. PI FU CTIO S VOUT (VFB) (Pin 1):For the LTC1174, this pin connects to the main voltage comparator’s input. On the LTC1174-3.3 and LTC1174-5 this pin goes to an internal resistive divider which sets the output voltage. LBOUT (Pin 2): Open Drain of an N-Channel Pull-Down. This pin will sink current when pin 3 (LBIN) goes below 1.25V. During shutdown this pin goes to high impedance. LBIN (Pin 3): The “–” Input of the Low-Battery Voltage Comparator. The “+” input is connected to a reference voltage of 1.25V. GND (Pin 4): Ground Pin. OUTPUT VOLTAGE (V) 0 50 40 30 20 10 0 4 1174 G15 1 2 3 5 LTC1174-5 LTC1174HV-5 LTC1174-3.3 LTC1174HV-3.3 INPUT VOLTAGE (V) 4 12 1174 G14 6 8 10 14 16 18 20 TA = 25°C 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 LTC1174HV LTC1174 |
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