◆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
◆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
■FEATURES
Input Voltage Range
: 2.4V ~ 6.0V
Low ESR Capacitor
: Ceramic capacitor compatible
(Low ESR Capacitors)
VD Function
: Detects output voltage from the
V
DOUT
pin while sensing either
V
DD
, D
COUT
, or V
ROUT
internally.
N-ch open drain output
<DC/DC Converter Block>
Output Voltage Range
: 1.6V ~ 4.0V (Accuracy
±2%)
Output Current
: 800mA
Controls
: PWM Control,
PWM, PWM/PFM
Automatic Switching External
Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
<Regulator Block>
Output Voltage Range
: 0.9V ~ 4.0V (Accuracy±2%)
Current Limit
: 600mA
Dropout Voltage
: 160mV @ I
OUT
=200mA
(V
OUT
=2.8V)
High Ripple Rejection
: 60dB @1kHz (V
OUT
=2.8V)
The XC9510 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 XC9510
can deliver output currents up to 800mA at efficiencies over
90%. The XC9510 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 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%).
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. The operational states of
the DC/DC and the regulator blocks can be changed by
inputting three kinds of voltage level via the CE/MODE pin. 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.
■TYPICAL
PERFORMANCE
CHARACTERISTICS
■TYPICAL
APPLICATION CIRCUIT
XC9510 ETR1007_001.doc
1351
XC9510
Series
■PIN
CONFIGURATION
SOP-8 (TOP VIEW)
■PIN
ASSIGNMENT
PIN NUMBER
1
2
3
4
5
6
7
8
PIN NAME
P
GND
CE/MODE
V
DD
V
DOUT
A
GND
V
ROUT
D
COUT
LX
FUNCTION
Power Ground
Chip Enable / MODE Switch
Power Supply
VD Output
Analog Ground
VR Output
DC/DC Output
Switch
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9510①②③④⑤⑥
DESIGNATOR
①
②③
The input for the voltage regulator block comes from the DC/DC.
DESCRIPTION
SYMBOL
As chart below
Internal
standard
3
6
C
S
R
L
:-
: Setting voltage and specifications of each DC/DC, VR,
and VD Based on the internal standard)
: 300kHz
: 600kHz
: 1.2MHz
: SOP-8
: Embossed Tape, standard feed
: Embossed Tape, reverse feed
DESCRIPTION
Control Methods And
The VD Sense Pin
Setting Voltage &
Specifications
DC/DC Oscillation
Frequency
Package
Device Orientation
④
⑤
⑥
●Control
Methods, CE/MODE Pin, VDSENSE Pin
SERIES
TYPE
A
B
C
D
E
F
H
K
L
DC/DC
CONTROL
METHODS
CE=”VCEH” LEVEL
CE=”VCEM”
LEVEL
-
DC/DC: ON
VR: ON
VD: ON
PWM Control
CE=”VCEL”
LEVEL
DC/DC: OFF
VR: OFF
VD: ON
DC/DC: OFF
VR: OFF
VD: ON
DC/DC: OFF
VR: OFF
VD: ON
VD SENSE
PIN
V
DD
D
COUT
V
ROUT
V
DD
D
COUT
V
ROUT
V
DD
D
COUT
V
ROUT
-
PWM Control
DC/DC: ON
VR: OFF
VD: ON
PFM / PWM
Automatic Switch
XC9510
PWM,
PFM/PWM
Manual Switch
1352
XC9510
Series
■MARKING
RULE (Continued)
④⑤Represents
detect voltage DC/DC,VR and VD
ex)
MARK
④
1
⑤
3
DC/DC
3.3V
VR
1.8V
VD
4.0V
PRODUCT SERIES
XC9510*13*S*
⑥Represents
oscillation frequency
.
MARK
3
6
C
OSCILLATION FREQUENCY
300kHz
600kHz
1.2MHz
PRODUCT SERIES
XC9510***3A*
XC9510***6A*
XC9510***CA*
⑦Represents
last digit of production year.
ex)
MARK
3
4
PRODUCTION YEAR
2003
2004
⑧⑨Represents
production lot number
0 to 9,A to Z reverse character 0 to 9, A to Z repeated (G,I,J,O,Q,W excepted)
Note: No character inversion used
■BLOCK
DIAGRAM
* Diodes shown in the above circuit are protective diodes.
1354
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