SC4614
SC4614 is 500kHz Voltage Mode PWM Controller manufactured by SEMTECH.
Description
The SC4614 is a high-speed, voltage mode PWM controller that provides the control and protection Features necessary for a synchronous buck converter. The SC4614 is designed to directly drive the top and bottom MOSFETs of the buck converter. It allows the converter to operate at 500k Hz switching frequency with 4V to 25V power rail and as low as 0.5V output. It uses an internal 8.2V supply as the gate drive voltage for mini.. mum driver power loss and MOSFET switching loss. The SC4614 Features soft-start, supply power under voltage lockout, and hiccup mode over current protection. The SC4614 monitors the output current by using the Rdson of the bottom MOSFET in the buck converter that eliminates the need for a current sensing resistor. The SC4614 is offered in a MSOP-10 package.
Features u 500k Hz switching frequency u 4V to 25V power rails u 0.5V voltage reference for programmable output u u u u u u u voltages Internal LDO for optimum gate drive voltage 1.5A gate drive current Adaptive non-overlapping gate drives provide shoot-through protection for MOSFETs Internal soft start Hiccup mode short circuit protection Power rail under voltage lockout MSOP-10 package, fully Ro HS and WEEE pliant
Applications u u u u u
Embedded, low cost, high efficiency converters Point of load power supplies Set top box power supplies PDP/TFT TVs Consumer electronics
Typical Application Circuit
12V IN
+
1 2 3 4 5
BST OCS P FB GND
DH PN DL VCC DRV
10 9 8 7 6 +
1.5V OUT
1 2
January 16, 2007
.semtech.
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter Input Supply Voltage BST to GND BST to PN PN to GND PN to GND Negative Pulse (tpulse < 20ns) .. DL to GND DL to GND Negative Pulse (tpulse < 20ns) DH to PN DH to PN Negative Pulse (tpulse...
