XC9280 Series ETR05064-001 18V Operation 3.0A Synchronous Step-Down DC/DC Converters в– GENERAL DESCRIPTION
The XC9280 series is 18V bootstrap synchronous step-down DC/DC converter with built-in Nch-Nch driver transistors,
the operating voltage range is 4.5VпЅћ18.0V, designed to allow the use of ceramic capacitors.
0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.8V to 7.0V using
external resistors (RFB1, RFB2).
Switching frequency is 1.2MHz. In PWM/PFM automatic switchover control, IC can change the control method between PWM
and PFM based on the output current requirement and as a result IC can achieve high efficiency over the full load range.
XC9280 has a fixed internal soft start time which is 0.95ms (TYP.), additionally the time can be extended by using an external
resistor and capacitor.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage goes down to 3.33V (TYP.) or lower.
Over current protection and thermal shutdown are embedded and they secure a safety operation. в– APPLICATIONS в– FEATURES в—Џ Digital TV Input Voltage Range : 4.5VпЅћ18Vпј€Absolute Max 20Vпј‰ в—Џ Set Top Box Output Voltage Range : 1.8VпЅћ7.0V or VIN x 0.7 в—Џ Security camera FB Voltage : 0.75VВ±1.5% Oscillation Frequency : 1.2MHz Output Current : 3A peak в—Џ Smart meter
в—Џ Security system 2.0A DC (VIN=12V, VOUT=5V)
Control Method : PWM/PFM Automatic Soft-start Time : 0.95ms Protection Circuits : Adjustable by RC Low ESR Ceramic Capacitor : Ceramic Capacitor Package : TSOT-26 Environmentally Friendly : EU RoHS Compliant, Pb Free в– TYPICAL APPLICATION CIRCUIT VIN CBST L Lx CFB
GND в– TYPICAL PERFORMANCE
CHARACTERISTICS BST CIN
(ceramic)
EN/SS UVLO
Over Current Protection
пј€Automatic Recoveryпј‰
Thermal Shutdown RFB1 FB
RFB2 CL
(ceramic) 1/29 XC9280Series
в– BLOCK DIAGRAM …