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XC9280 Datasheet Preview

XC9280 Datasheet

Step-Down DC/DC Converter

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XC9280 Series
18V Operation 3.0A Synchronous Step-Down DC/DC Converters
ETR05064-003
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 4.5V~18.0V, 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.
APPLICATIONS
Digital TV
Set Top Box
Security camera
Smart meter
Security system
FEATURES
Input Voltage Range
Output Voltage Range
FB Voltage
Oscillation Frequency
Output Current
Control Method
Soft-start Time
Protection function
Output Capacitor
Package
Environmentally Friendly
: 4.5V ~ 18V (Absolute Max 20V)
: 1.8V ~ 7.0V or VIN x 0.7
: 0.75V±1.5%
: 1.2MHz
: 3A peak
2.0A DC (VIN=12V, VOUT=5V)
: PWM/PFM Automatic
: 0.95ms
Adjustable by RC
: UVLO
Over Current Protection
(Automatic Recovery)
Thermal Shutdown
: Ceramic Capacitor
: TSOT-26
: EU RoHS Compliant, Pb Free
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE
CHARACTERISTICS
CIN
(ceramic)
VIN
BST
EN/SS
Lx
GND
FB
CBST L
RFB1
CFB
RFB2
CL
(ceramic)
1/28




Torex

XC9280 Datasheet Preview

XC9280 Datasheet

Step-Down DC/DC Converter

No Preview Available !

XC9280 Series
BLOCK DIAGRAM
VIN
EN/SS
Local
Reg
EN
VREF
Soft
Start
FB
UVLO
Thermal
Shutdown
Control
Logic
+
ERR
AMP
-
Phase Compensation
Ramp Wave
Generator,
OSC
PWM
Comparator
Current
Feedback
Current
Limit
Current
Limit PFM
PWM/PFM
Control Logic
Output
Buffer
BS T
Control
Switch
Nch
H ig hsid e
DRV Tr.
Nch
Lowside
DRV Tr.
BST
LX
GND
* Diodes inside the circuit are an ESD protection diodes and a parasitic diodes.
PRODUCT CLASSIFICATION
1) Ordering Information
XC9280①②③④⑤⑥-(*1)
DESIGNATOR
ITEM
SYMBOL
Type
A
②③
FB Voltage
75
DESCRIPTION
Refer to Selection Guide
0.75V
Oscillation
C
Frequency
1.2MHz
⑤⑥-(*1)
Packages
(Order Unit)
YR-G(*1)
TSOT-26 (3,000pcs/Reel)
(*1) The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
2) Selection Guide
TYPE
A
Chip Enable
Yes
UVLO
Yes
Thermal
Shutdown
Yes
TYPE
A
Soft Start
Yes
Current
Limiter
Yes
Automatic Recovery
(Current Limiter)
Yes
2/28


Part Number XC9280
Description Step-Down DC/DC Converter
Maker Torex
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XC9280 Datasheet PDF






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