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LT8390 Datasheet(PDF) 10 Page - Linear Technology |
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LT8390 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 30 page  LT8390A 10 8390afa For more information www.linear.com/LT8390A CTRL: Control Input for ISP/ISN Current Sense Threshold. The CTRL pin is used to program the ISP/ISN current limit: IIS(MAX) = Min VCTRL −0.25V,1V ( ) 10 •RIS The VCTRL can be set by an external voltage reference or a resistor divider from VREF to ground. For 0.3V ≤ VCTRL ≤ 1.15V, the current sense threshold linearly goes up from 5mV to 90mV. For VCTRL ≥ 1.35V, the current sense threshold is constant at 100mV full scale value. For 1.15V ≤ VCTRL ≤ 1.35V, the current sense threshold smoothly transitions from the linear function of VCTRL to the 100mV constant value. Tie CTRL to VREF for the 100mV full scale threshold. Force the pin below 0.3V to stop switching. ISP: Positive Terminal of the ISP/ISN Current Sense Re- sistor (RIS). Ensure accurate current sense with Kelvin connection. ISN: Negative Terminal of the ISP/ISN Current Sense Resistor (RIS). Ensure accurate current sense with Kelvin connection. ISMON:ISP/ISNCurrentSenseMonitorOutput.TheISMON pin generates a voltage that is equal to ten times V(ISP-ISN) plus 0.25V offset voltage. For parallel applications, tie the masterLT8390AISMONpintotheslaveLT8390ACTRLpin. PGOOD: Power Good Open Drain Output. The PGOOD pin is pulled low when the FB pin is within ±10% of the final regulation voltage. To function, the pin requires an external pull-up resistor. SS: Soft-Start Timer Setting. The SS pin is used to set soft-start timer by connecting a capacitor to ground. An internal 12.5µA pull-up current charging the external SS capacitor gradually ramps up FB regulation voltage. A 22nF capacitor is recommended on this pin. Any UVLO or thermal shutdown immediately pulls SS pin to ground and stops switching. Using a single resistor from SS to VREF, the LT8390A can be set in three different fault protection modes during output short-circuit condition: hiccup (no resistor), latch-off (499kΩ), and keep-running (100kΩ). See more details in the Application Information section. FB: Voltage Loop Feedback Input. The FB pin is used for constant-voltage regulation and output fault protection. The internal error amplifier with its output VC regulates VFB to 1.00V through the DC/DC converter. During output PIN FUNCTIONS short-circuit(VFB<0.25V)condition,thepartgetsintoone fault mode per customer setting. During an overvoltage (VFB > 1.1V) condition, the part turns off all TG1, BG1, TG2, BG2, and LOADTG. VC: Error Amplifier Output to Set Inductor Current Com- parator Threshold. The VC pin is used to compensate the control loop with an external RC network. During LOADEN low state, the VCpinisdisconnectedfromallinternalloads to store its voltage information. RT: Switching Frequency Setting. Connect a resistor from this pin to ground to set the internal oscillator frequency from 600kHz to 2MHz. SYNC/SPRD: Switching Frequency Synchronization or Spread Spectrum. Ground this pin for switching at inter- nal oscillator frequency. Apply a clock signal for external frequency synchronization. Tie to INTVCC for 25% triangle spread spectrum above internal oscillator frequency. LOADTG: High Side PMOS Load Switch Top Gate Drive. A bufferedandinvertedversionoftheLOADENinputsignal,the LOADTG pin drives an external high side PMOS load switch with a voltage swing from the higher voltage of (VOUT-5V) and 1.2V to VOUT. Leave this pin unconnected if not used. VOUT: Output Supply. The VOUT pin must be tied to the power output to determine the buck, buck-boost, or boost operation regions. The VOUTpinalsoservesaspositiverail for the LOADTG drive. Locally bypass this pin to ground with a minimum 1µF ceramic capacitor. TG2: Boost Side Top Gate Drive. Drives the gate of boost side top N-Channel MOSFET with a voltage swing from SW2 to BST2. SW2: Boost Side Switch Node. The SW2 pin swings from a Schottky diode voltage drop below ground to VOUT. BST2: Boost Side Bootstrap Floating Driver Supply. The BST2 pin has an integrated bootstrap Schottky diode from theINTVCCpinandrequiresanexternalbootstrapcapacitor to the SW2 pin. The BST2 pin swings from a diode voltage drop below INTVCC to (VOUT + INTVCC). BG2: Boost Side Bottom Gate Drive. Drives the gate of boost side bottom N-channel MOSFET with a voltage swing from ground to INTVCC. GND (Exposed Pad): Ground. Solder the exposed pad directly to the ground plane. |
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