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LT3756IMSE-PBF Datasheet(PDF) 8 Page - Linear Technology |
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LT3756IMSE-PBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  LT3756/LT3756-1 8 37561f BLOCK DIAGRAM + – + – + – + – + – + + – A1 A3 A6 + + – FREQ PROG 1.25V SSCLAMP 1.1V CTRL VREF SHDN/UVLO ISP ISN Q2 150mV 50k 140μA 2μA CTRL BUFFER gm EAMP PWM COMPARATOR DRIVER ISENSE A4 gm A10 A5 OVFB COMPARATOR 1.25V FB SHORT-CIRCUIT DETECT (LT3756 ONLY) SCILMB SCILMB 5k PWMOUT PWM 1.25V VIN INTVCC VC + – A2 RQ S RAMP GENERATOR 100kHz TO 1MHz OSCILLATOR A8 7V LDO GATE SENSE OPENLED GND 1.2V FB 1.22V 2V 1.3V RT SYNC (LT3756-1 ONLY) SS SHDN A7 10μA 10μA AT FB = 1.25V VC TSD FAULT LOGIC 10μA 10μA AT A1+ = A1– pull-down current. Above the 1.24V (nominal) threshold (but below 6V), SHDN/UVLO input bias current is sub- μA. Below the falling threshold, a 2μA pull-down current is enabled so the user can define the hysteresis with the external resistor selection. An undervoltage condition resets soft-start. Tie to 0.4V, or less, to disable the device and reduce VIN quiescent current below 1μA. Do not tie SHDN/UVLO to a voltage higher than VIN. INTVCC(Pin13/Pin7):RegulatedSupplyforInternalLoads, GATE Driver and PWMOUT Driver. Supplied from VIN and regulates to 7V (typical). INTVCC must be bypassed with a 4.7μF capacitor placed close to the pin. Connect INTVCC directly to VIN if VIN is always less than or equal to 7V. VIN (Pin 14/Pin 8): Input Supply Pin. Must be locally bypassed with a 0.22μF (or larger) capacitor placed close to the IC. SENSE (Pin 15/Pin 9): The current sense input for the control loop. Kelvin connect this pin to the positive ter- minal of the switch current sense resistor, RSENSE, in the source of the NFET. The negative terminal of the current sense resistor should be connected to the GND plane close to the IC. GATE (Pin 16/Pin 10): N-Channel FET Gate Driver Output. Switches between INTVCC and GND. Driven to GND during shutdown, fault or idle states. Exposed Pad (Pin 17/Pin 17): Ground. This pin also serves as current sense input for control loop, sensing negative terminal of current sense resistor. Solder the Exposed Pad directly to ground plane. PIN FUNCTIONS |
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