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LTC1143LCS Datasheet(PDF) 5 Page - Linear Technology |
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LTC1143LCS Datasheet(HTML) 5 Page - Linear Technology |
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5 / 20 page  5 LTC1143/LTC1143L LTC1143L-ADJ TYPICAL PERFORMANCE CHARACTERISTICS Gate Charge Supply Current OPERATING FREQUENCY (kHz) 20 140 14 12 10 8 6 4 2 0 LTC1143 G10 80 260 200 QP = 100nC QP = 29nC Current Sense Threshold Voltage TEMPERATURE (°C) 0 175 150 125 100 75 50 25 0 80 LTC1143 G12 20 40 60 100 MAXIMUM THRESHOLD MINIMUM THRESHOLD OUTPUT VOLTAGE (V) 0 80 70 60 50 40 30 20 10 0 4 LTC1143 G11 1 2 3 5 VSENSE = VOUT VOUT = 5V VOUT = 3.3V Off-Time vs VOUT ITH5 (Pin 7): Gain Amplifier Decoupling Point, 5V Section. The 5V section current comparator threshold increases with the Pin 7 voltage. SENSE– 5 (Pin 8): Connects to internal resistive divider which sets the output voltage for the 5V section. Pin 8 is also the (–) input for the current comparator on the 5V section. SENSE+ 5 (Pin 9): The (+) Input to the 5V Section Current Comparator. A built-in offset between Pins 9 and 8 in conjunction with RSENSE 5 sets the current trip threshold for the 5V section. SHUTDOWN 5 (Pin 10): When grounded, the 5V section operates normally. Pulling Pin 10 high holds the 5V section MOSFET off and puts the 5V section in micropower shut- down mode. Requires CMOS logic level signal with tr,tf<1µs. Do not “float” Pin 10. GND5 (Pin 11): 5V Section Ground. Two independent ground lines must be routed separately from other grounds to: 1) the (–) terminal of the 5V section output capacitor and 2) the cathode of the Schottky diode D2 and (–) terminal of CIN5 (see Figure 9). P-DRIVE 5 (Pin 12): High Current Drive for Top P-Channel MOSFET, 5V Section. Voltage swing at this pin is from VIN5 to ground. PIN FUNCTIONS LTC1143/LTC1143L SENSE+3 (Pin 1): The (+) Input to the 3.3V Section Current Comparator. A built-in offset between Pins 1 and 16 in conjunction with RSENSE 3 sets the current trip threshold for the 3.3V section. SHUTDOWN 3 (Pin 2): When grounded, the 3.3V section operates normally. Pulling Pin 2 high holds the MOSFET off and puts the 3.3V section in micropower shutdown mode. Requires CMOS logic level signal with tr, tf < 1µs. Do not “float” Pin 2. GND3 (Pin 3): 3.3V Section Ground. Two independent ground lines must be routed separately from other grounds to: 1) the (–) terminal of the 3.3V section output capacitor and 2) the cathode of the Schottky diode D1 and (–) terminal of CIN3 (see Figure 9). P-DRIVE 3 (Pin 4): High Current Drive for Top P-Channel MOSFET, 3.3V Section. Voltage swing at this pin is from VIN3 to ground. VIN5 (Pin 5): Supply Pin, 5V Section. Must be closely decoupled to 5V power ground Pin 11. CT5 (Pin 6): External capacitor CT5 from Pin 6 to ground sets the operating frequency for the 5V section. (The actual frequency is also dependent upon the input voltage.) |
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