XC9511
Series
Synchronous Step-Down DC/DC Converter
with Built-In LDO Regulator In Parallel Plus Voltage Detector
ETR1008_001
■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.
■APPLICATIONS
●CD-R
/ RW, DVD
●HDD
●PDAs,
portable communication modem
●Palmtop
computers
●Cellular
phones
●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 VD sensing Options for either
V
DD
, D
COUT
, or V
ROUT
Package
: SOP-8
<DC/DC Converter Block>
Output Voltage Range
: 0.9V ~ 4.0V (Accuracy
±
2%)
Output Current
: 800mA
Control Method
: PWM or PWM/PFM Selectable
Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
<Regulator Block>
Regulator Input
: Parallel Input to DC/DC converter
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
V
IN
=5.0V, Topr=25
o
C, L: 4.7μH(CDRH4D28C)
C
IN
: 4.7μF(ceramic), C
L
1: 10μF(ceramic), C
L
2: 4.7μF(ceramic)
XC9511Axxx
SOP-8 (TOP VIEW)
* Please refer to the typical application circuit when
external components are selected.
1/35
XC9511
Series
■PIN
CONFIGURATION
PGND 1
PVDD 2
AVDD 3
VDOUT 4
8 LX
7 DCOUT
6 VROUT
5 AGND
SOP-8 (TOP VIEW)
■PIN
ASSIGNMENT
PIN NUMBER
1
2
3
4
5
6
7
8
PIN NAME
P
GND
P
VDD
A
VDD
V
DOUT
A
GND
V
ROUT
D
COUT
LX
FUNCTION
Power Ground
Power Supply 1
Power Supply 2
VD Output
Analog Ground
VR Output
DC/DC Output
Switch
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9511①②③④⑤⑥
DESIGNATOR
①
② ③
The input for the voltage regulator block comes from V
DD
DESCRIPTION
Control Methods and
the VD Sense Pin
Setting Voltage &
Specifications
DC/DC Oscillation Frequency
Package
Device Orientation
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
④
⑤
⑥
●Control
Methods and VD SENSE Pin
SERIES
①
A
B
C
D
E
F
DC/DC CONTROL METHODS
PWM control
VD SENSE
V
DD
D
COUT
V
ROUT
V
DD
D
COUT
V
ROUT
XC9511
PFM/PWM Automatic Switch
2/35
XC9511
Series
■BLOCK
DIAGRAM
* Diodes shown in the above circuit are protective diodes
■ABSOLUTE
MAXIMUM RATINGS
Ta = 25℃
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
Lx Pin Current
Power Dissipation
SOP-8
Operating Temperature Range
Storage Temperature Range
SYMBOL
A
VDD
P
VDD
D
COUT
V
ROUT
I
ROUT
V
DOUT
I
VD
Lx
I
Lx
Pd
Topr
Tstg
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 ~ V
DD
+ 0.3
50
- 0.3 ~ V
DD
+ 0.3
±1300
650
- 40 ~ + 85
- 55 ~ + 125
UNIT
V
V
V
V
mA
V
mA
V
mA
mW
℃
℃
(*) When implemented on a glass epoxy PCB.
3/35
XC9511
Series
■ELECTRICAL
CHARACTERISTICS
XC9511xxxCSx
●Common
Characteristics
PARAMETER
Supply Current 1
Supply Current 2
Input Voltage Range
SYMBOL
I
DD
1
I
DD
2
V
IN
CONDITIONS
V
IN
=CE=D
COUT
=5.0V
V
IN
=CE=5.0V, D
COUT
=0V
MIN.
-
-
2.4
TYP.
250
300
-
MAX.
310
360
6.0
UNITS
μA
μA
V
Topr=25℃
CIRCUIT
1
1
-
Topr=25℃
●DC/DC
Converter (1.5V product)
PARAMETER
Output Voltage
Oscillation Frequency
Maximum Duty Ratio
Minimum Duty Ratio
PFM Duty Ratio
* XC9511D/E/F
U.V.L.O. Voltage (*1)
LX SW ‘High’ ON Resistance (*2)
LX SW ‘Low’ ON Resistance
LX SW ‘High’ Leak Current (*11)
LX SW ‘Low’ Leak Current (*11)
Maximum Output Current
Current Limit (*8)
Efficiency (*3)
Output Voltage
Temperature Characteristics
Soft-Start Time
Latch Time (*4, 9)
SYMBOL
DC
OUT
(E)
F
OSC
MAXDUTY
MINDUTY
PFMDUTY
VUVLO
RLXH
RLXL
IleakH
IleakL
Imax1
Ilim1
EFFI
Connected to the external components
I
DOUT
=100mA
CONDITIONS
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
MIN.
1.470
1.02
100
-
21
1.00
-
-
-
-
800
1.0
-
-
2
-
TYP.
1.500
1.20
-
-
30
1.40
0.5
0.5
0.05
0.05
-
1.1
90
±100
5
8
MAX.
1.530
1.38
-
0
38
1.78
0.9
0.9
1.00
1.00
-
-
-
-
10
25
UNITS
V
MHz
%
%
%
V
Ω
Ω
μA
μA
mA
A
%
ppm/
℃
ms
ms
CIRCUIT
3
3
4
4
3
3
5
3
11
11
3
6
3
3
3
10
DC
OUT
I
DOUT
=30mA
△Topr・DC
OUT
-40℃≦Topr≦85℃
TSS
Tlat
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
4/35
XC9511
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
XC9511xxxCSx (Continued)
●Regulator
(3.3V product)
PARAMETER
Output Voltage
Maximum Output Current
Load Regulation
Dropout Voltage 1 (*5)
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.
3.234
400
-
-
-
-
480
-
-
-
TYP.
3.300
-
15
50
100
0.05
600
30
60
±100
MAX.
3.366
-
50
110
200
0.25
-
-
-
-
UNITS
V
mA
mV
mV
mV
%/V
mA
mA
dB
ppm/
℃
Topr=25℃
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・VDF
CE=0V
V
HYS
=[V
DR
(E)
(*10)
Topr=25℃
CONDITIONS
- V
DF
(E)] / V
DF
(E) x 100
MIN.
2.646
2
1
-
TYP.
2.700
5
-
±100
MAX.
2.754
8
-
-
UNITS
V
%
mA
ppm/
℃
CIRCUIT
8
8
9
8
VDOUT=0.5V, CE=0V
-40℃≦Topr≦85℃
Test conditions: Unless otherwise stated:
DC/DC : VIN=3.6V [DC
OUT
:1.5V]
VR: V
IN
= 4.3V (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:
*2:
*3:
Including hysteresis operating voltage range.
ON resistance (Ω)= 0.05 (V) / ILX (A).
EFFI = { ( Output Voltage x Output Current ) / ( Input Voltage x Input Current) } x 100
current limit pulse generating.
*5:
*6:
*7:
*8:
*9:
*10:
Vdif = (V
IN
1
(*6)
- VR
OUT
1
(*7)
)
V
IN
1 = The input voltage when VROUT1 appears as input voltage is gradually decreased.
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.
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.
Integral latch circuit=latch time may become longer and latch operation may not work when V
IN
is 3.0V or more.
V
DR(E)
= VD release voltage
*4: 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
*11: When temperature is high, a current of approximately 5.0μA (maximum) may leak.
*12: When using the IC with a regulator output at almost no load, a capacitor should be placed as close as possible between
AVDD and AGND (C
IN
2), connected with low impedance. Please also see the recommended pattern layout on page 13
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.
5/35
嵌入式系统
