Low Voltage Synchronous Buck Controller ( 10 Page)
PIN FUNCTION DESCRIPTION
Supply rail for the floating top gate driver. To form a boost circuit, use an external diode to bring the desired
input voltage to this pin (cathode connected to BOOT pin). Connect a capacitor (C
) between this pin and
the LX pin. Typical values for C
range from 0.1 mF to 1 mF. Ensure that C
is placed near the IC.
Switch node pin. This is the reference for the floating top gate driver. Connect this pin to the source of the top
Top gate MOSFET driver pin. Connect this pin to the gate of the top N−channel MOSFET.
Bottom gate MOSFET driver pin. Connect this pin to the gate of the bottom N−channel MOSFET.
IC ground reference. All control circuits are referenced to this pin.
Supply rail for the internal circuitry. Operating supply range is 4.5 V to 13.2 V. Decouple with a 1 mF capacitor
to GND. Ensure that this decoupling capacitor is placed near the IC.
Compensation Pin. This is the output of the error amplifier (EA) and the non−inverting input of the PWM com-
parator. Use this pin in conjunction with the FB pin to compensate the voltage−control feedback loop. Pull this
pin low for disable.
This pin is the inverting input to the error amplifier. Use this pin in conjunction with the COMP pin to com-
pensate the voltage−control feedback loop. Connect this pin to the output resistor divider (if used) or directly
Voltage Offset Sense
Power Good output. Pulled Low if VOS is ±10% of 0.8 V V
ABSOLUTE MAXIMUM RATINGS
Main Supply Voltage Input
Bootstrap Supply Voltage Input
35 V wrt/GND
40 V < 100 ns
15 V wrt/LX
Switching Node (Bootstrap Supply Return)
40 V for < 100 ns
−10 V for < 200 ns
High−Side Driver Output (Top Gate)
30 V wrt/GND
15 V wrt/LX
40 V for < 100 ns
−0.3 V wrt/LX
−2 V for < 200 ns
Low−Side Driver Output (Bottom Gate)
+ 0.3 V
−5 V for < 200 ns
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Operating Junction Temperature Range
0 to 150
Operating Ambient Temperature Range
0 to 70
Storage Temperature Range
−55 to +150
Moisture Sensitivity Level
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
This device is ESD sensitive. Use standard ESD precautions when handling.
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