XCM526
Series
3A, 16VDriver Transistor Built-In Step-Down DC/DC Converter
ETR2430-003a
The XCM526 series is a multi-module IC which includes a step-down DC/DC controller IC and P-channel power MOSFET.
The IC enables a high efficiency, stable power supply with an output current up to 3A. Low ESR electrolytic capacitors such
as an OS-CON aluminum solid capacitor, a tantalum Neo capacitor can be used as an output capacitor. In case of using a
ceramic capacitor, RSENSE is needed to be placed on.
The XCM526 series has a 0.9V (±1.5%) reference voltage, and using externally connected resistors, the output voltage can
be set freely. With an internal switching frequency of 500kHz and 1.0MHz, small external components can also be used.
The XCM526A has a fixed PWM control for low output voltage ripple, and the XCM526B has a PWM/PFM control, which
automatically switches from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of load
conditions. As for the soft-start time, there are two types, one is internally set to 4ms and the other can be externally set-up.
With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input
voltage becomes 2.3V (TYP.) or lower.
■GENERAL
DESCRIPTION
☆GreenOperation
Compatible
■APPLICATIONS
●LCD
TVs
●DSC/DVCs
●Portable
games
●Portable
equipments
■FEATURES
<DC/DC Block>
Operating Voltage Range
Output Voltage Externally Set Range
Maximum Output Current
Oscillation Frequency
Control Methods
: 4.0V ~ 16.0V
: 1.2V ~ (standard 0.9V +1.5%)
: 3.0A
: 500kHz, 1.0MHz
: PWM control (XCM526A)
PWM/PFM automatic switching
(XCM526B)
: 4ms internally fixed and externally set
: Short-circuit protection
: 70mΩ (V
GS
=-4.5V)
47mΩ (V
GS
=-10.0V)
: USP-12B01 (2.3mm x 2.8mm)
: EU RoHS Compliant, Pb Free
Soft-Start Function
Protection Circuits
<Power MOSFET Block>
ON Resistance
Package
Environmentally Friendly
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XCM526A x /B x 9A x x
SBD:CLS01, L=SLF10165T-4.7μH
SBD:CLS01, L=SLF10165T-4.7μH
CIN=22μF (ceramic), CL=47μF (ceramic), RSENSE=50mΩ
CIN=22uF(ceramic), CL=47uF(ceramic), RSENSE=50mohm
VOUT=3.3V
VOUT=3.3V
Efficiency : EFFI (%)
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN=5.0V
(TOP VIEW)
VIN=12V
PWM(XCM526A)
PWM (XCM526A)
PWM/PFM (XCM526B)
PFM(XCM526B)
1
10
100
1000
10000
Output Current : IOUT (mA)
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XCM526
Series
■PIN
CONFIGURATION
CE
VIN
SOURCE
SOURCE
SOURCE
SOURCE
1
2
3
4
5
6
Step-Down
DC/DC
Controller
12
11
10
9
FB
VSS
EXT/
GATE
NC
NC
Pch
POWERMOS
8
7
DRAIN
USP-12B01
(TOP VIEW)
USP-12B01
(BOTTOM VIEW)
NOTE:
* A dissipation pad on the back side should be electrically isolated between the two chips.
*1: Voltage level of the DC/DCs’ dissipation pad should be V
SS
level.
*2: P-channel Power MOS should be DRAIN level.
Care must be taken for a voltage level of each dissipation pad so as to enhance mounting strength and thermal release when the pad needs
to be connected to the circuit.
■PIN
ASSIGNMENT
PIN No.
1
2
3
4
5
6
7
8
9
10
11
12
Back Side TAB
(*2)
PIN NAME
CE
VIN
SOURCE
SOURCE
SOURCE
SOURCE
NC
NC
GATE
EXT/
VSS
FB
DRAIN
FUNCTION
DC/DC Block, Chip Enable
DC/DC Block, Power Supply
POWER MOS SOURCE
POWER MOS SOURCE
POWER MOS SOURCE
POWER MOS SOURCE
No Connection
No Connection
POWER MOS GATE
DC/DC Block, Transistor Drive
DC/DC Block, Ground
DC/DC Block, Output Voltage Sense
POWER MOS DRAIN
2/28
XCM526
Series
■PRODUCT
CLASSIFICATION
XCM526A①②③④⑤-⑥
(
*1
)
:
PWM control
*1
XCM526B①②③④⑤-⑥
( )
: PWM/PFM automatic switching control
DESIGNATOR
①
②
③
④⑤-⑥
(*1)
ITEM
Type
Output Voltage
Oscillation Frequency
(*2)
Package (Order Unit)
SYMBOL
C
D
9
5
A
DR-G
DESCRIPTION
Soft-start internally fixed
Soft-start externally set
FB Standard Voltage 0.9V±1.5%
500kHz
1.0MHz
USP-12B01 (3,000/Reel)
●Ordering
Information
(*1) The XCM526 series is Halogen and Antimony free as well as being fully RoHS compliant.
(*2) For the 300kHz type is semi-custom product. Please contact your local Torex sales office or representative.
■BLOCK
DIAGRAMS
●XCM526xC
Series
VIN
Under Voltage
Lock Out
●XCM526xD
Series
VIN
Under Voltage
Lock Out
U.V.L.O
U.V.L.O
Short Circuit
Protection
MaxDutyLimit
Protection
Buffer
EXT/
Short Circuit
Protection
MaxDutyLimit
Protection
Buffer
EXT/
FB
CE
VREF
0.9V
-
Err Amp
FB
-
PWM
Comparator
PWM/PFM Control LOGIC
OSC Enable
-
CE
Err Amp
VREF
0.9V
-
PWM
Comparator
PWM/PFM Control LOGIC
OSC Enable
+
+
+
OE
Soft Start
(internal)
Ram½
Wave
OSC
PWM Wave
(XC9221series)
(XA9221series)
R
Q
S
+
OE
Soft Start
(internal)
Ram½
Wave
OSC
PWM Wave
(XC9221series)
(XA9221series)
RS Latch
R
S
RS Latch
Q
Frequency :
1 MHz , 500 kHz , 300 kHz
Each circuit
Each circuit
Chip Enable
Frequency :
1 MHz , 500 kHz , 300 kHz
Each circuit
Each circuit
CE
Chip Enable
LOGIC
VSS
CE
LOGIC
VSS
SOURCE
SOURCE
GATE
DRAIN
GATE
DRAIN
* Diodes inside the circuits are ESD protection diodes and parasitic diodes.
3/28
XCM526
Series
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
V
IN
Pin Voltage
FB Pin Voltage
CE Pin Voltage
EXT/ Pin Voltage
EXT/ Pin Current
Drain-Source Voltage
Gate-Source Voltage
Drain Current (DC)
Drain Current (Pulse)
Power Dissipation
(*1)
Ta = 25
O
C
RATINGS
- 0.3 ~ + 18
- 0.3 ~ + 18
- 0.3 ~ + 18
- 0.3 ~ V
IN
+ 0.3
+ 100
-30
±20
-5
-12
150
UNITS
V
V
V
V
mA
V
V
A
A
mW
O
O
SYMBOL
V
IN
V
FB
V
CE
V
EXT/
I
EXT/
V
DSS
V
GSS
I
D
I
DP
Pd
Topr
Tstg
USP-12B01
USP-12B01
(PCB mounted)
(*2)
800 (1ch operation)
600 (2ch operation)
- 40 ~ + 85
- 55 ~ +125
Operating Temperature Range
Storage Temperature Range
C
C
(*1) PW≦10μs, duty cycle≦1%
(*2) The power dissipation figure shown is a reference data taken on board mounting.
Also, the power dissipation value above is for each channel.
Please refer to page 26 for details.
4/28
XCM526
Series
■ELECTRICAL
CHARACTERISTICS
XCM526AC/BC Series (DC/DC Controller)
PARAMETER
FB Voltage
Input Voltage Range
UVLO Voltage
(Minimum Operating Voltage)
Supply Current 2
Stand-by Current
Oscillation Frequency
Maximum Duty Ratio
PFM Duty Ratio
EXT/ High ON Resistance
EXT/ Low ON Resistance
Short-Circuit Protection
Soft-Start Time
Efficiency
(*1)
SYMBOL
V
FB
V
IN
V
UVLO
I
DD2
I
STB
f
OSC
D
MAX
D
PFM
R
EXTBH
R
EXTBL
V
SHORT
t
SS
EFFI
I
OUT
=500mA
No load (XCM526B)
Connected to an external
components
V
IN
=5.0V, V
FB
=1.0V
CONDITIONS
MIN.
0.8865
4.0
1.9
TYP.
0.9000
-
2.3
MAX.
0.9135
16.0
2.7
UNITS
V
V
V
μA
μA
kHz
%
%
Ω
Ω
V
ms
%
ppm/℃
V
V
μA
μA
μA
μA
Ta=25℃
CIRCUIT
②
-
③
①
①
③
②
③
④
④
②
②
③
②
②
②
①
①
④
④
* See the Oscillation Frequency chart below.
-
0.1
1.0
* See the Oscillation Frequency chart below.
100
15
6
6
-
-
-
1.2
-
-
25
10
12
-
92
±100
-
-
-
-
-
-
-
35
16
20
0.7
-
-
-
0.3
0.1
0.1
0.1
0.1
* See the Oscillation Frequency chart below.
ΔV
FB
/
FB Voltage
Temperature Characteristics (ΔTopr½V
FB
)
CE “High” Level Voltage
CE “Low” Level Voltage
CE “High” Level Current
CE “Low” Level Current
FB “High” Level Current
FB “Low” Level Current
Unless otherwise stated, V
IN
=5.0V
NOTE:
(*1) EFFI = { (output voltage) x (output current)} / { (input voltage) x (input current) } x 100
V
CEH
V
CEL
I
CEH
I
CEL
I
FBH
I
FBL
V
IN
= V
CE
=16V
V
IN
=16V, V
CE
=0V
V
IN
=V
FB
=16V
V
IN
=16V, V
FB
=0V
-0.1
-0.1
-0.1
-0.1
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