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18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter

■GENERAL DESCRIPTION

The XC9248 series is 18V bootstrap synchronous step-down DC/DC converter with built-in Nch-Nch driver transistors.

With an input voltage range from 4.5V to 18V and a maximum output current of 2.2A, the series is suitable for digital home

appliance power supplies and can be used with small ceramic capacitors.

The series has a 0.8V reference voltage, and using externally connected resistors, the output voltage can be set freely from

1.0V to 12V.

The control method is synchronous PWM (Source/ Sink). The soft start time is internally set to 2.8ms (TYP.), also can be

adjusted using external capacitor.

With UVLO (Under Voltage Lock Out) function, the internal driver transistors are forced OFF when input voltage falls down

below 3.8V (TYP.).

protection and thermal shutdown.

■APPLICATIONS

●Digital home appliance

●Office automation equipment

●Notebook computers

●Car accessories power supplies

■TYPICAL APPLICATION CIRCUIT

ETR05022-004

■FEATURES

Input Voltage

：

4.5V ～ 18V

Output Voltage

：

(*1)

Output Current

：

2.2A

Efficiency

：

93.8%

Oscillation Frequency

：

500kHz

Maximum Duty Cycle

：

79%

Soft-Start Time

：

Fixed2.8ms, set by external capacitor

Protection Circuit

：

UVLO

High side over current protection

Low side over current protection

Thermal shutdown

Package

：

SOP-8FD

Environmentally Friendly

：

EU RoHS Compliant, Pb Free

Efficiency vs. Output Current

■TYPICAL PERFORMANCE

CHARACTERISTICS

L

EN

EN

SS

FB

GND

BST

Ta=25°C

0

10

20

30

40

50

60

70

80

90

100

0

500

1000

1500

2000