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XC9508

Torex Semiconductor
Part Number XC9508
Manufacturer Torex Semiconductor
Description Synchronous Step-Down DC/DC Converter
Published May 30, 2007
Detailed Description June 9, 2005 V7 ◆Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator plus Voltage Detector ◆Step-Down DC/...
Datasheet PDF File XC9508 PDF File

XC9508
XC9508

Overview
June 9, 2005 V7 ◆Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator plus Voltage Detector ◆Step-Down DC/DC Converter's Output Connected in Series with LDO Regulator ◆High Efficiency, Low Noise Regulated Output ◆Ultra Small Packages: MSOP-10, USP-10 ◆Small-Footprint ◆Output Current DC/DC:600mA, VR: 200mA ◆Ceramic Capacitor Compatible (Low ESR Capacitors) ■APPLICATIONS ●CD-R / RW, DVD ●HDD ●PDAs, portable communication modem ●Cellular phones ●Palmtop computers ●Cameras, video recorders ■GENERAL DESCRIPTION The XC9508 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in series with the DC/DC converter's output.
A voltage detector is also built-in.
A highly efficient, low noise output is possible since the regulator is stepped-down further from the DC/DC output.
The DC/DC converter block incorporates a P-channel driver transistor and a synchronous N-channel switching transistor.
With an external coil, diode and two capacitors, the XC9508 can deliver output currents up to 600mA at efficiencies over 90%.
small ceramic capacitors.
A choice of three switching frequencies are available, 300 kHz, 600 kHz, and 1.
2 MHz.
Output voltage settings for the DC/DC is set-up internally in 100mV steps within the range of 1.
6V to 4.
0V(± 2.
0%) and for the VR are set-up internally within the range of 0.
9V to 4.
0V (± 2.
0%).
range is of 0.
9V to 5.
0V (± 2.
0%).
The soft start time of the series is internally set to 5ms.
With the built-in U.
V.
L.
O.
(Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.
4 V or lower.
The functions of the MODE pin can be selected via the external control pin to switch the DC/DC control mode and the disable pin to shut down the regulator block.
For the VD, the The XC9508 is designed for use with ■FEATURES Input Voltage Range Low ESR Capacitor VD Function Output Voltage Range Output Current Controls : 2.
4V ~ 6.
0V : Ceramic capacitor compatible : N...


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