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LTC4441EMSE Datasheet(PDF) 6 Page - Linear Technology |
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LTC4441EMSE Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page LTC4441/LTC4441-1 44411f 6 PI FU CTIO S PGND (Pin 1/Pin 1): Driver Ground. Connect the DRVCC bypass capacitor directly to this pin, as close as possible to the IC. In addition, connect the PGND and SGND pins together close to the IC, and then connect this node to the source of the power MOSFET (or current sense resistor) with as short and wide a PCB trace as possible. BLANK (Pin 2/NA): Current Sense Blanking Output. Use this pin to assert a blanking time in the power MOSFET’s source current sense signal. The LTC4441 pulls this open-drain output to SGND if the driver output is low. The output becomes high impedance after a programmable blanking time from the driver leading edge output. This blanking time can be adjusted with the RBLANK pin.* RBLANK (Pin 3/NA): Blanking Time Adjust Input. Connect a resistor from this pin to SGND to set the blanking time. A small resistor value gives a shorter delay. Leave this pin floating if the BLANK pin is not used.* SGND (Pin 4/Pin 2): Signal Ground. Ground return for the DRVCC regulator and low power circuitry. IN (Pin 5/Pin 3): Driver Logic Input. This is the non- inverting driver input under normal operating conditions. *Available only on the lo-lead version of the LTC4441. EN/SHDN (Pin 6/Pin 4): Enable/Shutdown Input. Pulling this pin above 1.21V allows the driver to switch. Pulling this pin below 1.09V forces the driver output to go low. Pulling this pin below 0.45V forces the LTC4441/ LTC4441-1 into shutdown mode; the DRVCC regulator turns off and the supply current drops below 12µA. FB (Pin 7/Pin 5): DRVCC Regulator Feedback Input. Con- nect this pin to the center tap of an external resistive divider between DRVCC and SGND to program the DRVCC regulator output voltage. To ensure loop stability, use the value of 330kΩ for the top resistor, R1. VIN (Pin 8/Pin 6): Main Supply Input. This pin powers the DRVCC linear regulator. Bypass this pin to SGND with a 1µF ceramic, tantalum or other low ESR capacitor in close proximity to the LTC4441/LTC4441-1. DRVCC (Pin 9/Pin 7): Linear Regulator Output. This output pin powers the driver and the control circuitry. Bypass this pin to PGND using a 10µF ceramic, low ESR (X5R or X7R) capacitor in close proximity to the LTC4441/LTC4441-1. OUT (Pin 10/Pin 8): Driver Output. Exposed Pad (Pin 11/NA): Ground. The Exposed Pad must be soldered to the PCB ground. IVIN vs fIN IVIN vs CLOAD TYPICAL PERFOR A CE CHARACTERISTICS fIN (kHz) 0 300 100 200 400 500 600 700 900 800 1000 4441 G21 50 45 20 15 5 10 0 40 35 30 25 TA = 25°C CLOAD = 4.7nF DRVCC = 5V DRVCC = 9V CLOAD (nF) 015 5 10 20253035 45 40 50 4441 G22 60 50 20 10 0 40 30 TA = 25°C fIN = 100kHz DRVCC = 5V DRVCC = 9V MSOP/SO-8 |
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