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LT3756-1 Datasheet(PDF) 10 Page - Linear Technology |
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LT3756-1 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 26 page  LT3791-1 10 37911fa For more information www.linear.com/LT3791-1 pin FuncTions BST2 (Pin 22): Bootstrapped Driver Supply. The BST2 pin swings from a diode voltage below INTVCC up to a diode voltage below VOUT + INTVCC. NC (Pin 23): No Connect Pin. Leave this pin floating. TG2 (Pin 24): Top Gate Drive. Drives the top N-channel MOSFET with a voltage equal to INTVCC superimposed on the switch node voltage SW2. ISP (Pin 25): Connection Point for the Positive Terminal of the Output Current Feedback Resistor. ISN (Pin 26): Connection Point for the Negative Terminal of the Output Current Feedback Resistor. SNSP (Pin 27): The Positive Input to the Current Sense Comparator. The VC pin voltage and controlled offsets between the SNSP and SNSN pins, in conjunction with a resistor, set the current trip threshold. SNSN (Pin 28): The Negative Input to the Current Sense Comparator. TEST1 (Pin 29): This pin is used for testing purposes only and must be connected to SGND for the part to operate properly. SGND (Pin 30, Exposed Pad Pin 39): Signal Ground. All small-signal components and compensation should connect to this ground, which should be connected to PGND at a single point. Solder the exposed pad directly to the ground plane. PWMOUT (Pin 31): Buffered Version of PWM Signal for Driving Output Load Disconnect N-Channel MOSFET. The PWMOUT pin is driven from INTVCC. Use of a MOSFET with a gate cutoff voltage higher than 1V is recommended. CCM (Pin 32): Continuous Conduction Mode Pin. When the pin voltage is higher than 1.5V, the part runs in fixed frequency forced continuous conduction mode and al- lows the inductor current to flow negative. When the pin voltage is less than 0.3V, the part runs in discontinuous conduction mode and does not allow the inductor current to flow backward. This pin is only meant to block inductor reverse current, and should only be pulled low when the output current is low. This pin must be either connected to INTVCC (pin 13) for continuous conduction mode across all loads, or it must be connected to the C/10 (pin 4) with a pull-up resistor to INTVCC for continuous conduction mode at heavy load and for discontinuous conduction mode at light load. CLKOUT (Pin 33): Clock Output Pin. A 180° out-of-phase clockisprovidedattheoscillatorfrequencytoallowforpar- alleling two devices for extending output power capability. SYNC (Pin 34): External Synchronization Input Pin. This pin is internally terminated to GND with a 90k resistor. The internal buck clock is synchronized to the rising edge of the SYNC signal while the internal boost clock is 180° phase shifted. RT (Pin 35): Frequency Set Pin. Place a resistor to GND to set the internal frequency. The range of oscillation is 200kHz to 700kHz. VC(Pin36):CurrentControlThresholdandErrorAmplifier Compensation Point. The current comparator threshold increases with this control voltage. The voltage ranges from 0.7V to 1.9V. FB (Pin 37): Voltage Loop Feedback Pin. FB is intended for constant-voltageregulation.Theinternaltransconductance amplifier with output VC will regulate FB to 1.2V (typical) through the DC/DC converter. If the FB input is regulat- ing the loop and V(ISP-ISN) < 10mV, the C/10 pull-down is asserted. If the FB pin is less than 400mV, the SHORT pull-down is asserted. OVLO (Pin 38): Overvoltage Input Pin. This pin is used for OVLO, if OVLO > 3V then SS is pulled low, the part stops switching and resets. Do not leave this pin open. |
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