XC9510
Series
Synchronous Step-Down DC/DC Converter
with Built-In LDO Regulator In Series Plus Voltage Detector
ETR1007_001
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.
■GENERAL
DESCRIPTION
■APPLICATIONS
●CD-R
/ RW, DVD
●HDD
●PDAs,
portable communication modem
●Cellular
phones
●Palmtop
computers
●Cameras,
video recorders
■FEATURES
DC/DC Converter with Built-in LDO and VD Function
Input Voltage Range
: 2.4V ~ 6.0V
Low ESR Capacitor
: Ceramic capacitor compatible
VD Function
: Three Sensing Options for Either
VDD, DCOUT or VROUT
N-ch open drain output
Package
: SOP-8
<DC/DC Converter Block>
Output Voltage Range
: 1.6V ~ 4.0V (Accuracy
±2%)
Output Current
: 800mA,
Controls
: PWM or PWM/PFM Selectable
Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
<Regulator Block>
Regulator Input
: Serial Input from DC/DC output
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)
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
1/36
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
2/36
XC9510
Series
■BLOCK
DIAGRAM
* Diodes shown in the above circuit are protective diodes.
■ABSOLUTE
MAXIMUM RATINGS
PARAMETER
V
DD
Pin Voltage
DC
OUT
Pin Voltage
VR
OUT
Pin Voltage
VR
OUT
Pin Current
VD
OUT
Pin Voltage
VD
OUT
Pin Current
Lx Pin Voltage
Lx Pin Current
CE/MODE Pin Voltage
Power Dissipation
SOP-8
SYMBOL
VDD
DC
OUT
VR
OUT
IR
OUT
VD
OUT
I
VD
Lx
ILx
CE/MODE
Pd
Topr
Tstg
RATINGS
- 0.3 ~ 6.5
- 0.3 ~ V
DD
+ 0.3
- 0.3 ~ V
DD
+ 0.3
800
- 0.3 ~ V
DD
+ 0.3
50
- 0.3 ~ V
DD
+ 0.3
±1300
- 0.3 ~ V
DD
+ 0.3
650*
- 40 ~ + 85
- 55 ~ + 125
V
V
V
Ta = 25℃
UNIT
mA
V
mA
V
mA
V
mW
℃
℃
Operating Temperature Range
Storage Temperature Range
(*) When PC board mounted.
3/36
XC9510
Series
■ELECTRICAL
CHARACTERISTICS
XC9510xxxCSx
●Common
Characteristics
PARAMETER
Supply Current 1
Supply Current 2
Stand-by Current (*1)
Input Voltage Range
CE ‘H’ Level Voltage
*XC9510D/E/F
CE ‘H’ Level Voltage
*XC9510H/K/L
CE ‘M’ Level Voltage
CE ‘L’ Level Voltage
CE ‘H’ Level Current
CE ‘L’ Level Current
SYMBOL
I
DD
1
I
DD
2
I
STB
V
IN
V
CEH
V
CEH
V
CEM
V
CEL
I
CEH
I
CEL
CONDITIONS
V
IN
=CE=D
COUT
=5.0V
V
IN
=CE=5.0V, D
COUT
=0V
V
IN
=6.5V, CE=0V
MIN.
-
-
-
2.4
V
DD
-0.3
V
DD
-0.3
0.6
V
SS
- 0.1
- 0.1
TYP.
250
300
3.0
-
-
-
-
-
-
-
MAX.
310
360
7.0
6.0
V
DD
V
DD
V
DD
-1.2
0.25
0.1
0.1
UNITS
μA
μA
μA
V
V
V
V
V
μA
μA
Topr=25℃
CIRCUIT
1
1
1
-
2
3
3
3
1
1
Topr=25℃
CONDITIONS
V
IN
=CE=D
COUT
=5.0V
VI
N
=CE=5.0V, D
COUT
=0V
V
IN
=CE=D
COUT
=5.0V
V
IN
=CE=5.0V, D
COUT
=0V
Connected to the external components,
I
DOUT
=30mA
Connected to the external components,
I
DOUT
=10mA
D
COUT
=0V
D
COUT
=V
IN
Connected to the external components,
No load
Connected to the external components
D
COUT
=0V, LX=V
IN
-0.05V
Connected to the external components,
V
IN
=5.0V
V
IN
=LX=6.0V, CE=0V
V
IN
=6.0V, LX=CE=0V
Connected to the external components
Connected to the external components,
I
DOUT
=100mA
I
DOUT
=30mA
-40℃≦Topr≦85℃
Connected to the external components,
CE=0V V
IN
, I
DOUT
=1mA
Connected to the external components,
V
IN
=CE=5.0V, Short D
COUT
by 1Ωresistor
MIN.
-
-
-
-
2.156
1.02
100
-
21
1.00
-
-
-
-
800
1.0
-
-
2
-
TYP.
200
250
250
300
2.200
1.20
-
-
30
1.40
0.5
0.5
0.05
0.05
-
1.1
90
+100
5
8
MAX.
280
330
310
360
2.244
1.38
-
0
38
1.78
0.9
0.9
1.00
1.00
-
-
-
-
10
25
UNITS
μA
μA
μA
μA
V
MHz
%
%
%
V
Ω
Ω
μA
μA
mA
A
%
ppm/
℃
ms
ms
CIRCUIT
1
1
1
1
3
3
4
4
3
3
5
3
11
11
3
6
3
3
3
10
●DC/DC
Converter (2.2V product)
PARAMETER
Supply Current 1 *XC9510D/E/F
Supply Current 2 *XC9510D/E/F
PFM Supply Current 1
*XC9510H/K/L
PFM Supply Current 2
*XC9510H/K/L
Output Voltage
Oscillation Frequency
Maximum Duty Ratio
Minimum Duty Ratio
PFM Duty Ratio
U.V.L.O. Voltage (*2)
LX SW ‘High’ ON Resistance
(*3)
LX SW ‘Low’ ON Resistance
LX SW ‘High’ Leak Current (*12)
LX SW ‘Low’ Leak Current (*12)
Maximum Output Current
Current Limit (*9)
Efficiency (*4)
Output Voltage
Temperature Characteristics
Soft-Start Time
Latch Time (*5, 10)
SYMBOL
I
DD
_DC1
I
DD
_DC2
I
DD
_PFM1
I
DD
_PFM2
DC
OUT
(E)
F
OSC
MAXDUTY
MINDUTY
PFMDUTY
VUVLO
RLXH
RLXL
IleakH
IleakL
Imax1
Ilim1
EFFI
DC
OUT
Topr・DC
OUT
TSS
Tlat
4/36
XC9510
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
XC9510xxxCSx (Continued)
●Regulator
(1.8V product)
PARAMETER
Output Voltage
Maximum Output Current
Load Regulation
Dropout Voltage 1 (*6)
Dropout Voltage 2
Line Regulation
Current Limit
Short-Circuit Current
Ripple Rejection Rate
Output Voltage
Temperature Characteristics
SYMBOL
VR
OUT
(E)
Imax2
VR
OUT
Vdif 1
Vdif 2
VROUT
V
IN
・VR
OUT
Ilim2
Ishort
PSRR
VR
OUT
Topr・VR
OUT
1mA≦IR
OUT
≦100mA
IR
OUT
=100mA
IR
OUT
=200mA
IR
OUT
=30mA
VR
OUT
(T)+1V≦V
IN
≦6V
VR
OUT
=VR
OUT
(E) x 0.9
VR
OUT
=VSS
V
IN
={V
OUT
(T)+1.0} V
DC
+0.5Vp-pAC,
IR
OUT
=30mA, f=1kHz
IR
OUT
=30mA
-40℃≦Topr≦85℃
CONDITIONS
IR
OUT
=30mA
MIN.
1.764
400
-
-
-
-
480
-
-
-
TYP.
1.800
-
15
100
200
0.05
600
30
60
+100
MAX.
1.836
-
50
200
400
0.25
-
-
-
-
V
mA
mV
mV
mV
%/V
mA
mA
dB
ppm/
℃
Topr=25℃
UNITS CIRCUIT
2
2
2
2
2
2
7
7
12
2
●Detector
(2.7V product)
PARAMETER
Detect Voltage
Hysteresis Range
VD Output Current
Output Voltage
Temperature Characteristics
SYMBOL
V
DF
(E)
V
HYS
IVD
V
DF
Topr・V
DF
CE=0V
V
HYS
=[V
DR
(E)
(*11)
CONDITIONS
- V
DF
(E)] / V
DF
(E) x 100
MIN.
2.646
2
1
-
TYP.
2.700
5
-
+100
MAX.
2.754
8
-
-
UNITS CIRCUIT
V
%
mA
ppm/
℃
8
8
9
8
VDOUT=0.5V, CE=0V
-40℃≦Topr≦85℃
Test conditions: Unless otherwise stated:
DC/DC : VIN=3.6V [@ DC
OUT
:2.2V]
VR: V
IN
= 2.8V (V
IN
=VR
OUT
(T) + 1.0V)
VD: V
IN
=5.0V
Common conditions for all test items: CE=V
IN
, MODE=0V
* VR
OUT
(T) : Setting output voltage
NOTE:
*1 : Including VD supply current (VD operates when in stand-by mode.)
*2 : Including hysteresis operating voltage range.
*3 : ON resistance (Ω)= 0.05 (V) / ILX (A)
*4 : EFFI = { ( Output Voltage x Output Current ) / ( Input Voltage x Input Current) } x 100
*5 : Time until it short-circuits DC
OUT
with GND through 1Ωof resistance from a state of operation and is set to DC
OUT
=0V
from current limit pulse generating.
*6 : Vdif = (V
IN
1
(*7)
- VR
OUT
1
(*8)
)
*7 : V
IN
1 = The input voltage when VR
OUT
1 appears as input voltage is gradually decreased.
*8 : VR
OUT
1 = A voltage equal to 98% of the output voltage whenever an amply stabilized I
OUT
{VR
OUT
(T) + 1.0V} is input.
*9 : Current limit = When V
IN
is low, limit current may not be reached because of voltage falls caused by ON resistance or
serial resistance of coils.
*10: Integral latch circuit=latch time may become longer and latch operation may not work when V
IN
is 3.0V or more.
*11: V
DR
(E) = VD release voltage
*12: When temperature is high, a current of approximately 5.0μA (maximum) may leak.
5/36
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