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LTC1142L-ADJ Datasheet(PDF) 7 Page - Linear Technology |
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LTC1142L-ADJ Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  7 LTC1142/LTC1142L/LTC1142HV PI FU CTIO S NDRIVE 1 (Pin 6): High Current Drive for Bottom N-Channel MOSFET, Section 1. Voltage swing at Pin 6 is from ground to VIN1. NC (Pins 7, 8): No Connection. PDRIVE 2 (Pin 9): High Current Drive for Top P-Channel MOSFET, Section 2. Voltage swing at this pin is from VIN2 to ground. VIN2 (Pin 10): Supply pin, section 2, must be closely decoupled to section 2 power ground, Pin 19. CT2 (Pin 11): External capacitor CT2 from Pin 11 to ground sets the operating frequency for the section 2. (The actual frequency is also dependent upon the input voltage.) INT VCC2 (Pin 12) : Internal supply voltage for section 2, nominally 3.3V, can be decoupled to signal ground, Pin 18. Do not externally load this pin. ITH2 (Pin 13): Gain Amplifier Decoupling Point, Section 2. The section 2 current comparator threshold increases with the Pin 13 voltage. SENSE– 2 (Pin 14): Connects (–) input for the current comparator on section 2. SENSE+2 (Pin 15): The (+) Input to the Section 2 Current Comparator. A built-in offset between Pins 15 and 14 in conjunction with RSENSE2 sets the current trip threshold for this section. VFB2 (Pin 16): This pin serves as the feedback pin from an external resistive divider used to set the output voltage for section 2. SHUTDOWN 2 (Pin 17): When grounded, the section 2 regulator operates normally. Pulling Pin 17 high holds both MOSFETs off and puts section 2 in micropower shutdown mode. Requires CMOS logic signal with tr, tf < 1µs. Do not “float” Pin 17. SGND2 (Pin 18): The section 2 small-signal ground must be routed separately from other grounds to the (–) termi- nal of the section 2 output capacitor. PGND2 (Pin 19): The section 2 driver power ground connects to source of the N-channel MOSFET and the (–) terminal of the section 2 input capacitor. NDRIVE 2 (Pin 20): High Current Drive for Bottom N- Channel MOSFET, Section 2. Voltage swing at Pin 20 is from ground to VIN2. NC (Pins 21, 22): No Connection. PDRIVE 1 (Pin 23): High Current Drive for Top P-Channel MOSFET, Section 1. Voltage swing at this pin is from VIN1 to ground. VIN1 (Pin 24): Supply Pin, Section 1. Must be closely decoupled to section 1 power ground Pin 5. CT1 (Pin 25): External capacitor CT1 from Pin 25 to ground sets the operating frequency for section 1. (The actual frequency is also dependent upon the input voltage.) INT VCC1 (Pin 26): Internal supply voltage for section 1, nominally 3.3V, can be decoupled to signal ground, Pin 4. Do not externally load this pin. ITH1 (Pin 27): Gain Amplifier Decoupling Point, Section 1. The section 1 current comparator threshold increases with the Pin 27 voltage. SENSE – 1 (Pin 28): Connects to the (–) input for the current comparator on section 1. |
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