XC9254R
Series
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converter
ETR0529-003
☆GreenOperation
Compatible
■GENERAL
DESCRIPTION
The XC9254R series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42ΩP-channel MOS driver
transistor and 0.52ΩN-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Operating voltage
range is from 2.0V to 6.0V. The XC9254R001 type has a fixed output voltage of 1.2V (accuracy:
±2.0%).
The device provides
a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors
connected externally.
With the built-in oscillator, 1.2MHz is fixed internally. As for operation mode, the XC9254R series is
automatic PWM/PFM switching control allowing fast response, low ripple and high efficiency over the full range of loads (from
light load to heavy load).
The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current
consumption to as low as 1.0μA or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel
MOS driver transistor is forced OFF when input voltage becomes 1.4V or lower.
Two types of package SOT-25 and USP-6C are available.
■APPLICATIONS
●Smart
phones / Mobile phones
●Bluetooth
●Mobile
devices / terminals
●Portable
game consoles
●Digital
still cameras / Camcorders
●Digital
audio equipments
●Note
PCs / Tablet PCs
■FEATURES
Driver Transistor Built-In
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Control Methods
Function
: 0.42Ω P-ch driver transistor
0.52Ω N-ch switch transistor
: 2.0V ~ 6.0V
: 1.2V
: 92% (TYP.)
: 600mA
: 1.2MHz (+15%)
: 100%
: PWM/PFM Auto
: Current Limiter Circuit Built-In
(Constant Current & Latching)
C
L
Discharge
: Low ESR Ceramic Capacitor
: -40℃
∼
+85℃
: SOT-25, USP-6C
: EU RoHS Compliant, Pb Free
Capacitor
Operating Ambient Temperature
Packages
Environmentally Friendly
* Performance depends on external components and wiring on the PCB.
■TYPICAL
APPLICATION CIRCUIT
CE
1/17
XC9254R
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
XC9254R Series, V
OUT
=1.2V, f
OSC
=1.2MHz, Ta=25℃
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current
Stand-by Current
Oscillation Frequency
PFM Switching Current
PFM Duty Limit
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
(*2)
SYMBOL
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
DD
I
STB
f
OSC
I
PFM
DTY
LIMIT_PFM
DTY
MAX
DTY
MIN
EFFI
R
LxH
R
LxH
R
LxL
R
LxL
I
LeakH
CONDITIONS
When connected to external components,
V
IN
=V
CE
=5.0V, I
OUT
=30mA
MIN.
1.176
2.0
TYP.
1.200
-
-
1.40
15
0
1200
180
200
MAX.
1.224
6.0
-
1.78
33
1.0
1380
240
UNIT
V
V
mA
V
μA
μA
kHz
mA
%
CIRCUIT
①
①
①
②
③
③
①
①
①
②
②
①
④
④
④
-
⑤
⑥
①
③
③
⑤
⑤
①
⑦
⑦
⑧
V
IN
=V
OUT(E)
+2.0V, V
CE
=1.0V,
(*8)
When connected to external components
(*11)
V
CE
=V
IN
, V
OUT
=V
OUT(E)
×0.5V
(*1, *10)
Voltage which Lx pin holding “L” level
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT(E)
×1.1V
V
IN
=5.0V, V
CE
=0V, V
OUT
=V
OUT(E)
×1.1V
When connected to external components,
V
IN
=V
OUT(E)
+2.0V, V
CE
=1.0V, I
OUT
=100mA
When connected to external components,
V
IN
=V
OUT(E)
+2.0V, V
CE
=V
IN
, I
OUT
=1mA
V
CE
=V
IN
=2.0V, I
OUT
=1mA
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT(E)
×0.9V
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT(E)
×1.1V
When connected to external components,
V
CE
=V
IN
=V
OUT(E)
+1.2V, I
OUT
=100mA
V
IN
=V
CE
=5.0V, V
OUT (E)
×0.9V
, I
Lx
=100mA
V
IN
=V
CE
=3.6V, V
OUT (E)
×0.9V
, I
Lx
=100mA
V
IN
=V
CE
=5.0V
V
IN
=V
CE
=3.6V
(*4)
(*4)
(*3)
(*3)
600
1.00
-
-
1020
140
100
-
-
-
-
-
-
-
(*7)
-
-
92
0.35
0.42
0.45
0.52
0.01
1050
±100
-
-
-
-
1.0
-
0.900
300
-
0
-
0.55
0.67
0.66
0.77
1.0
1350
-
6.0
0.25
0.1
0.1
2.5
20.0
1.150
450
%
%
%
Ω
Ω
Ω
Ω
μA
mA
ppm/℃
V
V
μA
μA
ms
ms
V
Ω
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leak Current
(*9)
(*5)
V
IN
=V
OUT
=5.0V, V
CE
=0V, Lx=0V
Current Limit
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection Threshold
Voltage
C
L
Discharge
I
LIM
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT(E)
×0.9V
△V
OUT
/
I =30mA, -40℃≦Topr≦85℃
(V
OUT
・△Topr)
OUT
V
OUT
= V
OUT(E)
×0.9V, Applied voltage to V
CE
,
V
CEH
(*10)
Voltage changes Lx to “H” level
V
CEL
I
CEH
I
CEL
t
SS
t
LAT
V
SHORT
R
DCHG
V
OUT
= V
OUT(E)
×0.9V, Applied voltage to V
CE
,
(*10)
Voltage changes Lx to “L” level
V
IN
=V
CE
=5.0V, V
OUT
= V
OUT(E)
×0.9V
V
IN
=5.0V, V
CE
=0V, V
OUT
= V
OUT(E)
×0.9V
When connected to external components,
V
CE
=0V
→
V
IN
, I
OUT
=1mA
V
IN
=V
CE
=5.0V, V
OUT
=0.8×V
OUT(E)
,
(*6)
Short Lx at 1Ω resistance
Sweeping V
OUT
, V
IN
=V
CE
=5.0V, Short Lx at
1Ω resistance, V
OUT
voltage which Lx becomes “L”
level within 1ms
V
IN
=5.0V, L
X
=5.0V, V
CE
=0V, V
OUT
=open
900
-
0.65
V
SS
- 0.1
- 0.1
0.5
1.0
0.675
200
Test conditions: Unless otherwise stated, V
IN
=5.0V, V
OUT(E)
=Nominal Voltage, applied voltage sequence is V
OUT
→V
IN
→V
CE
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current )
/
( input voltage×input current) }×100
*3: ON resistance (Ω)= (V
IN
- Lx pin measurement voltage)
/
100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: Time until it short-circuits V
OUT
with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*7: When V
IN
is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*8: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*9:
Current limit denotes the level of detection at peak of coil current.
*10: “H”=V
IN
~V
IN
-1.2V, “L”=+0.1V~-0.1V
*11: V
IN
is applied when V
OUT (E)
x 0.5V becomes more than V
IN
.
5/17
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