XC9246/XC9247
Series
16V Driver Transistor Built-In Step-Down DC/DC Converters
ETR05024-006
■GENERAL
DESCRIPTION
☆GreenOperation-compatible
XC9246/XC9247 series is a 16V step-down DC/DC converter with a built-in driver transistor. The series provides high efficiency,
and a stable power supply with output currents up to 1A. The series is designed for use with small ceramic capacitors.
The series has a 1.0V reference voltage, and using externally connected resistors, the output voltage can be set freely. With an
internal switching frequency of 1.2MHz, small external components can be used. The soft-start time is internally set to 1.5ms (TYP.),
but can be adjusted to set a longer time using an external resistor and capacitor.
As for operation mode, the XC9246 series is PWM control and the XC9247 series is automatic PWM/PFM switching control.
In PWM/PFM switching control mode, provides fast response, low ripple and high efficiency over the full range of loads (from light
load to heavy load).
With the UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes lower
than detect voltage. The series includes current limit, thermal shutdown, and short-circuit protection.
Two types of package SOT-26W and USP-6C are available.
■APPLICATIONS
●LCD-TVs
●BD/HDD
recorders
●Set
top box
●Home
video game consoles
●Multifunction
printers
■FEATURES
Input Voltage
Output Voltage Range
Output Current
Efficiency
Oscillation Frequency
Maximum Duty Cycle
Soft-start Time
Control Methods
Protection Circuits
:
:
:
:
:
:
:
:
:
4.5V½16V
(The V
IN
range depends on the product)
1.2V½5.6V (V
FB
=1.0V)
(The V
OUT
range depends on the product)
1A (V
IN
≧6V
and V
OUT
/V
IN
≦50%)
1A (V
IN
＜6V
and V
OUT
/V
IN
≦40%)
90%(V
IN
=12V, V
OUT
=5V, I
OUT
=200mA)
1.2MHz
80%
Internally fixed 1.5ms
Adjustable by RC
PWM Control (XC9246)
PWM/PFM Automatic switching control (XC9247)
Current limiter (Integral Latching)
Thermal shutdown
Short-circuit protection
4.15V, 5.65V, 7.65V
Ceramic Capacitor Compatible
-40℃½+85℃
USP-6C, SOT-26W
EU RoHS Compliant, Pb Free
UVLO
Output Capacitor
Operating Ambient Temperature
Packages
Environmentally Friendly
:
:
:
:
:
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XC9246B75/XC9247B75 (V
OUT
=5.0V)
L=6.8μH(VLP4045LT-6R8M), SBD=XBS204S19R
C
IN
=10μF(TMK316BJ106KL), C
L
=10μF×2(LMK212ABJ106KG)
100
90
80
Efficiency :EFFI(%)
70
60
50
40
30
20
10
0
1
10
100
1000
XC9246@VIN=12V
XC9247@VIN=12V
Output Current :I
OUT
(mA)
1/33
XC9246/XC9247
Series
■BLOCK
DIAGRAM
(*1) (*2) (*3)
(*1)
(*2)
Diodes inside the circuit are an ESD protection diode and a parasitic diode.
The XC9246 offers a fixed PWM control, a Control Logic to PWM/PFM Selector is fixed internally.
(*3)
The XC9247 control scheme is a fixed PWM/PFM automatic switching, a Control Logic to PWM/PFM Selector is fixed internally.
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9246B①②③④⑤-⑥ PWM Control
XC9247B①②③④⑤-⑥ PWM/PFM Automatic switching control
DESIGNATOR
ITEM
SYMBOL
42
①②
UVLO Release Voltage
65
75
③
Oscillation Frequency
C
ER-G
④⑤-⑥
(*1)
DESCRIPTION
4.15V (1.2V≦V
OUT
≦2.7V)
5.65V (1.2V≦V
OUT
≦3.8V)
7.65V
(XC9246: 1.5V≦V
OUT
≦5.0V)
(XC9247: 1.5V≦V
OUT
≦5.6V)
1.2MHz
USP-6C (3,000pcs/Reel)
SOT-26W (3,000pcs/Reel)
Packages (Order Unit)
MR-G
(*1)
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
●Selection
Guide
TYPE
B
EN/SS
Yes
CURRENT LIMIT
Yes
LATCH
Yes
UVLO
Yes
THERMAL
SHUTDOWN
Yes
2/33
XC9246/XC9247
Series
■PIN
CONFIGURATION
(*1)
The dissipation pad for the USP-6C 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 GND (No. 5) pin.
■PIN
ASSIGNMENT
PIN NUMBER
SOT-26W
1
2
3
4
5
6
USP-6C
6
5
4
3
2
1
PIN NAME
BST
GND
FB
EN/SS
V
IN
Lx
FUNCTIONS
Pre Driver Supply
Ground
Output Voltage Monitor
Enable Soft-start
Power Input
Switching Output
■FUNCTION
PIN NAME
EN/SS
(*1)
(*1)
SIGNAL
L
H
STATUS
Stand-by
Active
Please do not leave the EN/SS pin open.
3/33
XC9246/XC9247
Series
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
V
IN
Pin Voltage
BST Pin Voltage
FB Pin Voltage
EN/SS Pin Voltage
Lx Pin Voltage
Lx Pin Current
SOT-26W
Power Dissipation
USP-6C
Pd
SYMBOL
V
IN
V
BST
V
FB
V
EN/SS
V
LX
I
LX
RATINGS
-0.3½+22.0
-0.3½+22.0
and
Lx-0.3½Lx+6.0
-0.3½+6.0
-0.3½+22.0
-0.3½V
IN
+0.3 or V
BST
+0.3 or 22.0
(*1)
4000
250
600 (40mm x 40mm standard board)
(*2)
UNITS
V
V
V
V
V
mA
120
1000 (40mm x 40mm standard board)
(*2)
1250 (JEDEC board)
(*2)
mW
Operating Ambient Temperature
Storage Temperature
Topr
Tstg
-40½+85
-55½+125
℃
℃
All voltages are described based on the AGND and PGND pin.
(*1)
(*2)
The maximum value is the lowest one among V
IN
+0.3V, V
BST
+ 0.3V or +22V.
The power dissipation figure shown is PCB mounted and is for reference only.
Please see the power dissipation page for the mounting condition
4/33
XC9246/XC9247
Series
■ELECTRICAL
CHARACTERISTICS
XC9246/XC9247 Series
PARAMETER
FB Voltage
Operating Voltage Range
Maximum Output Current
UVLO Detection Voltage
UVLO Release Voltage
UVLO Hysteresis Voltage
Supply Current
Stand-by Current
Oscillation Frequency
Maximum Duty Cycle
Minimum Duty Cycle
PFM Switch Current
(*2)
PFM Duty Limit
(*2)
Lx SW ON Resistance
Current Limit
(*5)
Integral Latch Time
Short Detect Voltage
Internal Soft-start Time
External Soft-start Time
SYMBOL
V
FB
V
IN
I
OUTMAX
V
UVLOD
V
UVLOR
V
UVLOHYS
I
q
I
STB
f
OSC
D
MAX
D
MIN
I
PFM
DTY
LIMIT_PFM
R
Lx
I
LIM
t
LAT
V
SHORT
t
SS
1
t
SS
2
CONDITIONS
V
IN
=12V, V
EN/SS
=5V, V
FB
=0.9V→1.1V
Voltage to start oscillation while
-
-
V
EN/SS
=5V, V
FB
=0.9V
Voltage which Lx pin holding ”L” level
V
EN/SS
=5V, V
FB
=0.9V
Voltage to start oscillation while
-
V
IN
=12V, V
EN/SS
=5V, V
FB
=1.1V
V
IN
=16V, V
EN/SS
=0V
V
IN
=12V, V
EN/SS
=5V, V
FB
=0.9V
V
IN
=12V, V
EN/SS
=5V, V
FB
=0.9V
V
IN
=12V, V
EN/SS
=5V, V
FB
=1.1V
V
IN
=12V, V
EN/SS
=5V, V
OUT
=3.3V, I
OUT
=10mA
When connected to external components
-
V
IN
=12V, V
EN/SS
=5V, V
FB
=0.9V
V
IN
=12V, V
EN/SS
=5V, V
FB
=0.9V
V
IN
=12V, V
EN/SS
=5V, V
FB
=0.9V
Sweeping V
FB
, V
IN
=12V, V
EN/SS
=5V,
Short V
OUT
at1ΩResistance, V
FB
voltage which
Lx becomes “L” level within 300μs
V
IN
=12V, V
EN/SS
=0V→5V,V
FB
=0.9V
V
IN
=12V, V
EN/SS
=0V→5V, V
FB
=0.9V
R
SS
=120KΩ, C
SS
=0.47μF
When connected to external components
Efficiency
Output Voltage
Temperature Characteristics
Thermal Shutdown
Temperature
Hysteresis Width
EN/SS "H" Voltage
EN/SS "L" Voltage
EN/SS "H" Current
EN/SS "L" Current
FB "H" Current
FB "L" Current
Lx "L" Current
(*1)
(*2)
(*3)
(*4)
(*5)
(*6)
(*7)
(*6)
Ta=25℃
MIN.
TYP.
D1
(*1)
D2
(*1)
1000
-
D3
(*1)
D4
(*1)
D5
(*1)
-
-
1020
72
-
-
-
-
1600
0.75
0.3
0.75
18
150
6
1200
80
-
300
200
0.35
(*4)
MAX.
UNITS
V
V
CIRCUIT
②
①
①
②
②
-
③
③
②
②
②
①
①
-
②
②
④
②
⑤
-
mA
V
V
V
300
15
1380
88
0
-
-
0.5
-
3
0.7
3
35
(*4)
μA
μA
kHz
%
%
mA
%
Ω
mA
ms
V
ms
ms
2500
1.5
0.5
1.5
26
EFFI
∆V
OUT
/
(V
OUT
・∆Topr）
T
TSD
T
HYS
V
EN/SSH
V
EN/SSL
I
EN/SSH
I
EN/SSL
I
FBH
I
FBL
I
LXL
Target Output Voltage=5.0V
V
IN
=12V, I
OUT
=200mA
(*3)
I
OUT
=100mA
-40℃≦Topr≦85℃
-
-
V
IN
=12V, V
FB
=V
FB(E)
-10mV
V
IN
=12V, V
FB
=0V
V
EN/SS
=5V→0V, Voltage to stop oscillation while
V
IN
=V
EN/SS
=16V
V
IN
=12V, V
EN/SS
=0V
V
IN
=12V, V
EN/SS
=0V, V
FB
=5.5V
V
IN
=12V, V
EN/SS
=0V, V
FB
=0V
V
IN
=16V, V
EN/SS
=5V, V
FB
=1.1V, V
LX
=0V
(*7)
-
-
-
-
,
-
0.4
-
-0.1
-0.1
-0.1
-7.5
90
±100
150
20
2.0
-
7
-
-
-
-4
-
-
-
-
2.5
-
15
0.1
0.1
0.1
-
%
ppm/℃
℃
℃
V
V
μA
μA
μA
μA
μA
①
①
-
-
②
②
⑥
⑥
⑥
⑥
⑦
V
EN/SS
=5V→1V, Voltage to stop oscillation while
Unless otherwise stated, V
IN
=12V, V
EN/SS
=5V
Please refer to SPEC Table below.
As the XC9246 series work in the PWM control operation only, I
PFM
and DTY
LIMIT_PFM
are not for XC9246 series.
EFFI=[(output voltage x output current)÷(input voltage x input current)]×100
Design value
Current limit denotes the level of detection at peak of coil current.
"H"=V
IN
½V
IN
-1.2V , "L"=+0.1V½-0.1V
V
FB(E)
is effective value of FB voltage.
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