XC9509
Series
Synchronous Step-Down DC/DC Converter
with Built-In LDO Regulator in Parallel Plus Voltage Detector
ETR1006_001
■GENERAL
DESCRIPTION
The XC9509 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 XC9509 can deliver output currents up to 600mA at efficiencies over 90%.
The XC9509 is designed for use with small ceramic capacitors.
A choice of three switching frequencies are available, 300kHz, 600kHz, and 1.2MHz. 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. 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
either the DC/DC block or the regulator block.
■APPLICATIONS
●CD-R
/ RW, DVD
●HDD
●PDAs,
portable communication modem
●Cellular
phones
●Palmtop
computers
●Cameras,
video recorders
■FEATURES
Input Voltage Range
Low ESR Capacitor
VD Function
Small Package
: 2.4V ~ 6.0V
: Ceramic capacitor compatible
: Sense internally either V
DD
, D
COUT
,
or V
ROUT
. N-ch open drain output
: MSOP-10, USP-10
<DC/DC Converter Block>
Output Voltage Range
: 0.9V ~ 4.0V (Accuracy±2%)
Output Current
: 600mA (for MSOP-10 package)
400mA (for USP-10 package)
Control Method
: PWM or PWM/PFM Selectable
Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
<Regulator Block>
Reglator Output
: Parallel Input to DC/DC Converter
Output Voltage Range
: 0.9V ~ 4.0V (Accuracy±2%)
Current Limit
: 300mA
Dropout Voltage
: 80mV @ I
OUT
=100mA (V
OUT
=2.8V)
High Ripple Rejection
: 60dB @1kHz (V
OUT
=2.8V)
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XC9509Hxxxx
V
IN
=3.6V, Topr=25℃, L=4.7μH (CDRH4D28C),
C
IN
:4.7μF (ceramic), C
L1
:10μF (ceramic), C
L2
: 4.7μF (ceramic)
MSOP-10 (TOP VIEW)
* Please refer to the typical application circuit when
external components are selected.
1/41
XC9509
Series
■PIN
CONFIGURATION
■PIN
ASSIGNMENT
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
USP-10 (BOTTOM VIEW)
*The dissipation pad for the USP-10 package
should be solder-plated in recommended
mount pattern and metal masking so as to
enhance mounting strength and heat release.
If the pad needs to be connected to other pins,
it should be connected to the AGND pin.
PIN NAME
P
GND
CE
P
VDD
A
VDD
V
DOUT
A
GND
MODE
V
ROUT
D
COUT
LX
FUNCTION
Power Ground
Chip Enable
Power Supply 1
Power Supply 2
VD Input
Analog Ground
Mode Switch
VR Output
DC/DC Output Sense
Switch
MSOP-10 (TOP VIEW)
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9509①②③④⑤⑥
DESIGNATOR
①
②③
④
:
The input for the voltage regulator block comes from V
DD
.
SYMBOL
As chart below
Internal
standard
3
6
C
A
D
R
L
:-
: Setting voltage and specifications of each DC/DC, VR,
and VD (Based on the internal standard)
: 300kHz
: 600kHz
: 1.2MHz
: MSOP-10, Current limiter: 1.1A (TYP.)
: USP-10, Current limiter: 0.7A (TYP.)
: Embossed Tape, standard feed
: Embossed Tape, reverse feed
DESCRIPTION
DESCRIPTION
Control Methods, the
MODE Pin, & the VD
Sense Pin
Setting Voltage &
Specifications
DC/DC Oscillation
Frequency
Package &
DC/DC Current Limit
Device Orientation
⑤
⑥
●Control
Methods, MODE Pins, VD SENSE Pins
SERIES
①
A
B
C
D
XC9509
E
F
H
K
L
* The XC9509A to F series' MODE pin switches either the regulator block or DC/DC block to stand-by mode.
When the CE mode is off, every function except for the VD function enters into the stand-by mode.
(The MODE pin does not operate independently.)
DC/DC CONTROL METHODS
MODE PINS
(H LEVEL)
VR: OFF
MODE PINS
(L LEVEL)
VR: ON
VD SENSE
V
DD
D
COUT
V
ROUT
V
DD
PWM Control
DC/DC: OFF
DC/DC: ON
D
COUT
V
ROUT
PWM, PFM/PWM Manual
Switch
PFM/PWM Auto
Switch
V
DD
PWM Control
D
COUT
V
ROUT
2/41
XC9509
Series
■BLOCK
DIAGRAM
PVDD
DCOUT
Phase
Compensation
-
+
+
-
logic
Buf f er,
Driver
V ref w ith
sof t start
PW M/ PFM
Controller
Current
Limit & Feedback
Ramp Wave
Generator,
OSC
LX
CE
ON/OFF
Control
each circuit
PGND
MODE
Control
each circuit
MODE
AVDD
VROUT
U.V .L.O
-
+
Current
Limit
+
VDOUT
+
-
Vref
S ENS E
(V DD or DCOUT or V ROUT)
-
Vref
AGND
* Diodes shown in the above circuit are protective diodes.
■ABSOLUTE
MAXIMUM RATINGS
PARAMETER
A
VDD
Pin Voltage
P
VDD
Pin Voltage
D
COUT
Pin Voltage
V
ROUT
Pin Voltage
V
ROUT
Pin Current
V
DOUT
Pin Voltage
V
DOUT
Pin Current
Lx Pin Voltage
MSOP-10
Lx Pin Current
USP-10
CE Pin Voltage
MODE Pin Voltage
MSOP-10
Power Dissipation
USP-10
Operating Temperature Range
Storage Temperature Range
(*) When PC board mounted.
Ta = 25℃
RATINGS
- 0.3 ~ 6.5
A
VDD
- 0.3 ~ A
VDD
+ 0.3
- 0.3 ~ A
VDD
+ 0.3
- 0.3 ~ A
VDD
+ 0.3
800
- 0.3 ~ A
VDD
+ 0.3
50
- 0.3 ~ A
VDD
+ 0.3
1300
900
- 0.3 ~ A
VDD
+ 0.3
- 0.3 ~ A
VDD
+ 0.3
350 (*)
150
- 40 ~ + 85
- 55 ~ + 125
UNIT
V
V
V
V
mA
V
mA
V
mA
V
V
mW
℃
℃
SYMBOL
A
VDD
P
VDD
D
COUT
V
ROUT
I
ROUT
V
DOUT
I
VD
Lx
I
Lx
CE
MODE
Pd
Topr
Tstg
3/41
XC9509
Series
■ELECTRICAL
CHARACTERISTICS
XC9509xxxCAx
●Common
Characteristics
PARAMETER
Supply Current 1
Supply Current 2
Stand-by Current (*1)
Input Voltage Range
CE ‘H’ Level Voltage
CE ‘L’ Level Voltage
CE ‘H’ Level Current
CE ‘L’ Level Current
MODE 'H' Level Voltage
*XC9509A/B/C
MODE 'H' Level Voltage
*XC9509D/E/F/H/K/L
MODE 'L' Level Voltage
*XC9509A/B/C
MODE 'L' Level Voltage
*XC9509D/E/F/H/K/L
MODE 'H' Level Current
MODE 'L' Level Current
SYMBOL
I
DD
1
I
DD
2
I
STB
V
IN
V
CEH
V
CEL
I
CEH
I
CEL
V
MH
V
M
H
V
ML
V
ML
I
MH
I
ML
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
0.6
V
SS
- 0.1
- 0.1
0.6
0.6
V
SS
V
SS
- 0.1
- 0.1
TYP.
250
300
3.0
-
-
-
-
-
-
-
-
-
-
-
MAX.
310
360
7.0
6.0
V
DD
0.25
0.1
0.1
V
DD
V
DD
0.25
0.25
0.1
0.1
UNITS
μA
μA
μA
V
V
V
μA
μA
V
V
V
V
μA
μA
Topr=25℃
CIRCUIT
1
1
1
-
3
3
1
1
2
3
2
3
1
1
Topr=25℃
●DC/DC
Converter (1.5V product)
PARAMETER
Supply Current 1
*XC9509A/B/C
Supply Current 2
*XC9509A/B/C
PFM Supply Current 1 *
XC9509H/K/L
PFM Supply Current 2
* XC9509H/K/L
Output Voltage
Oscillation Frequency
Maximum Duty Ratio
Minimum Duty Ratio
PFM Duty Ratio
*XC9509H/K/L
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
D
COUT(E)
FOSC
MAXDUTY
MINDUTY
PFMDUTY
VUVLO
RLXH
RLXL
Il
eakH
I
leakL
I
max1
I
lim1
EFFI
D
COUT
Connected to the external components,
I
DOUT
=100mA
I
DOUT
=30mA
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 1Ω resistor
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
1.470
1.02
100
-
21
1.00
-
-
-
-
600
1.0
-
-
2
-
MIN.
-
TYP.
200
250
250
300
1.500
1.20
-
-
30
1.40
0.5
0.5
0.05
0.05
-
1.1
90
+100
5
8
MAX.
280
330
310
360
1.530
1.38
-
0
38
1.78
1.0
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
( Topr・D
COUT
) -40℃<Topr<85℃
T
SS
Tlat
4/41
XC9509
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
XC9509xxxCAx (Continued)
●Regulator
(3.3V product)
PARAMETER
Supply Current * XC9509H/K/L
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
I
DD_VR
V
ROUT(E)
I
max2
V
ROUT
Vdif 1
Vdif 2
V
ROUT
I
lim2
Ishort
PSRR
V
ROUT
1mA<I
ROUT
<100mA
I
ROUT
=30mA
I
ROUT
=100mA
I
ROUT
=30mA
V
ROUT
=V
ROUT
(E) x 0.9
V
ROUT
=V
SS
V
IN
=4.3V
DC
+0.5Vp-pAC,
I
ROUT
=30mA, f=1kHz
I
ROUT
=30mA
O
Topr=25℃
CONDITIONS
I
ROUT
=30mA
MIN.
-
3.234
200
-
-
-
-
240
-
-
-
TYP.
40
3.300
-
15
20
60
0.05
300
30
60
±100
MAX.
80
3.366
-
50
50
110
0.25
-
-
-
-
UNITS
μA
V
mA
mV
mV
mV
%/V
mA
mA
dB
ppm/
℃
CIRCUIT
1
2
2
2
2
2
2
7
7
12
2
( V
IN
・V
ROUT
) 4.3V<V
IN
<6.0V
( Topr・V
ROUT
) -40 C<Topr<85℃
●Detector
(2.7V product)
PARAMETER
Detect Voltage
Hysteresis Range
Output Current
* XC9509A/D/H
Output Current
* XC9509B/C/E/F/K/L
Output Voltage
Temperature Characteristics
SYMBOL
V
DF(E)
V
HYS
I
VD
I
VD
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
0.5
1.0
-
TYP.
2.700
5
-
-
±100
MAX.
2.754
8
-
-
-
UNITS
V
%
mA
mA
ppm/
℃
CIRCUIT
8
8
9
9
8
V
IN
=2.4V, V
DOUT
=0.5V, CE=0V
V
IN
=2.4V, V
DOUT
=0.5V, CE=0V
-40
O
C<Topr<85℃
Test conditions: Unless otherwise stated:
DC/DC : V
IN
=3.6V [@ D
COUT
:1.5V]
VR: V
IN
= 4.3V (V
IN
=V
ROUT(T)
+ 1.0V)
VD: V
IN
=5.0V
Common conditions for all test items: CE=V
IN
, MODE=0V
●V
ROUT(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) / I
LX
(A)
*4 : EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100
*5 : Time until it short-circuits D
COUT
with GND through 1Ωof resistance from a state of operation and is set to D
COUT
=0V from
current limit pulse generating.
*6 : Vdif = (V
IN
1
(*7)
- V
ROUT
1
(*8)
)
*7 : V
IN
1 = The input voltage when V
ROUT1
appears as input voltage is gradually decreased.
*8 : V
ROUT1
= A voltage equal to 98% of the output voltage whenever an amply stabilized I
OUT
{V
ROUT(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.
*13: When using the IC with a regulator output at almost no load, a capacitor should be placed as close as possible between
A
VDD
and A
GND
(C
IN2
), connected with low impedance. Please also see the recommended pattern layout for your
reference. Should it not be possible to place the input capacitor nearby, the regulated output level may increase up to
the V
DD
level while the load of the DC/DC converter increases and the regulator output is at almost no load.
5/41
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