SC4614 Datasheet, PDF (1/14 Pages) Semtech Corporation – 500kHz Voltage Mode PWM Controller

SC4614
500kHz Voltage Mode PWM Controller
POWER MANAGEMENT
Description
The SC4614 is a high-speed, voltage mode PWM con-
troller 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 con-
verter to operate at 500kHz 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 volt-
age 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.
Typical Application Circuit
Features
u 500kHz switching frequency
u 4V to 25V power rails
u 0.5V voltage reference for programmable output
voltages
u Internal LDO for optimum gate drive voltage
u 1.5A gate drive current
u Adaptive non-overlapping gate drives provide
shoot-through protection for MOSFETs
u Internal soft start
u Hiccup mode short circuit protection
u Power rail under voltage lockout
u MSOP-10 package, fully RoHS and WEEE compliant
Applications
u Embedded, low cost, high efficiency converters
u Point of load power supplies
u Set top box power supplies
u PDP/TFT TVs
u Consumer electronics
12V IN
1 _BST
2 _OCS
3 _COMP
4 _FB
5 _GND
DH ¹⁰
PN ⁹
DL ⁸
VCC ⁷
DRV ⁶
SC46 14
+
1.5V OUT
1
2
+
January 16, 2007
1
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