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XC9511 Datasheet Preview

XC9511 Datasheet

Synchronous Step-Down DC/DC Converter

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XC9511 Series
February 2, 2004 V5
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
! 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 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.
! FEATURES
Input Voltage Range : 2.4V ~ 6.0V
Load Capacitors :
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 Output
<DC/DC Converter>
Output Voltage Range : 0.9V ~ 4.0V (Accuracy ±2%)
Output Current :
800mA
Controls :
PWM Control
PWM, PWM / PFM Automatic
Switching External
Oscillation Frequency : 300kHz, 600kHz, 1.2MHz
<Regulator>
Output Voltage Range : 0.9V ~ 4.0V (Accuracy ±2%)
Current Limit
600mA
Dropout Voltage :
160mV @ IOUT=200mA (VOUT=2.8V)
High Ripple Rejection 60dB @1kHz (VOUT=2.8V)
! TYPICAL APPLICATION CIRCUIT
1
PGND
2 PVDD
LX 8
DCOUT 7
+
CIN1
+
CIN2
3 AVDD
VROUT 6
4 VDOUT
AGND
5
()
SD
SOP-8 (TOP VIEW)
L
DCOUT
+
C L2
VROUT
+
C L1
! TYPICAL PERFORMANCE CHARACTERISTICS
XC9511Axxxx
VIN=5.0V, Topr=25OC, L:4.7uH(CDRH4D28C)
CIN:4.7uF(ceramic), CL1:10uF(ceramic), CL2:1uF(ceramic)
100
90
80
70
60
50
40
30
DC/DC Efficiency
20 (DCOUT:3.3V, 1.2MHz)
10
0
0.1 1 10 100 1000
DC/DC Output Current IDOUT
Data Sheet
Semiconductor Ltd.
1




Torex Semiconductor

XC9511 Datasheet Preview

XC9511 Datasheet

Synchronous Step-Down DC/DC Converter

No Preview Available !

XC9511 Series
Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector
Preliminary
! PIN CONFIGURATION
PGND 1
PVDD 2
AVDD 3
VDOUT 4
SOP-8 (TOP VIEW)
8 LX
7 DCOUT
6 VROUT
5 AGND
! PIN ASSIGNMENT
PIN
NUMBER
PIN NAME
1 PGND
2 PVDD
3 AVDD
4 VDOUT
5 AGND
6 VROUT
7 DCOUT
8 LX
FUNCTION
Power Ground
Power Supply 1
Power Supply 2
VD Output
Analog Ground
VR Output
DC/DC Output
Switch
! SELECTION GUIDE
" Ordering Information
XC9511 123456
The input for the voltage regulator block comes from VDD.
DESIGNATOR SYMBOL
DESCRIPTION
1
23
Control Methods and the VD Sense pin (See the chart below)
Setting voltage and specifications of each DC/DC, VR, and VD (Based on the internal standard)
Oscillation Frequency of DC/DC :
4 3 300kHz
6 600kHz
C 1.2MHz
5 S Package Type :
SOP-8
Device Orientation :
6 R Embossed Tape : Standard feed
L Embossed Tape : Reverse feed
# Control Methods and VD SENSE Pin
SERIES
1 DC/DC CONTROL METHODS
XC9511
A
B
C
D
E
F
PWM Control
PFM/PWM
Automatic Switch
VD
SENSE
VDD
DCOUT
VROUT
VDD
DCOUT
VROUT
Semiconductor Ltd.
Data Sheet
2


Part Number XC9511
Description Synchronous Step-Down DC/DC Converter
Maker Torex Semiconductor
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XC9511 Datasheet PDF






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