Synchronous Step-Down DC/DC Converter
Description
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XC9511 Series
Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector Preliminary ! Synchronous step-down DC/DC converter
with built-in LDO regulator plus voltage detector
February 2, 2004 V5
! Step-down DC/DC converter's output connected in parallel
with LDO regulator
! ! ! !
SOP-8 package for high current Small-footprint Output Current (DC/DC : 800mA, VR : 400mA) 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 XC9511 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the DC/DC converter's output.
A voltage detector is also built-in.
Since the input for the LDO voltage regulator block comes from the input power supply, it is suited for use with various applications.
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 XC9511 can deliver output currents up to 800mA at efficiencies over 90%.
The XC9511 is designed for use with 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 and VR are set-up internally in 100mV steps within the range of 0.
9V to 4.
0V (± 2.
0%).
For the VD, the range is of 0.
9V to 5.
0V (± 2.
0%).
The soft start time of the series is internally set to 5ms.
With the builtin 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.
! FEATURES
Input Voltage Range : Load Capacitors : 2.
4V ~ 6.
0V Ceramic Capacitor Compatible (Low ESR Capacitors) VD Function : Detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally.
Nch Open Drain Outp...
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