XC9253R Series
ETR0528_002
Synchronous Step-Down DC/DC Converter
■GENERAL DESCRIPTIO N
The XC9253R series is a group of synchronous-rectification type DC/DC converters wit h a built-in 0.6ΩP-channel driver
transistor and 0.7ΩN-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs enable a high
efficiency, stable power supply with an output current of 500mA to be configured using only a coil and two capacitors
connected externally. Minimum operating voltage is 2.0V~6.0V. Output voltage is 3.3V(accuracy: ±2.0%). With the built-in
oscillator, oscillation frequency is set to 600kHz. As for operation mode, the XC9253R series is automatic PWM/PFM
switching control allowing fast response, low ripple and high efficiency over the full range of load (from light load to high
output current conditions).
The soft start and current control functions are internally optimized. During standby, 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 driver transistor is forced OFF when input voltage becomes 1.4V or lower. Two types of package, SOT-25 and
USP-6B, are available.
■APPLICATIONS
●Mobile phones
●Bluetooth equipment
●PDAs, Portable communication modem
●Portable games
●Cameras, Digital cameras
●Cordless phones
●Notebook computers
■TYPICAL APPLICATION CIRCUIT
VIN
L
1
VIN
5
Lx
V
500mA
OUT
■FEATURES
P-Ch Driver Tr. Built-In
N-Ch DriverTr. built-in
Input Voltage Range
Output Voltage Range
Low Power Consumption
Control Method
High Efficiency
Output Current
Oscillation Frequency
Low Output Ripple
Maximum Duty Ratio
Operating Ambient Temperature
Packages
Soft-Start Circuit Built-In
Current Limiter Circuit Built-In
Low ESR Ceramic Capacitor Compatible
* Performance depends on external components and wiring on the PCB
☆GreenOperation Compatible
: ON resistance 0.6Ω
: ON resistance 0.7Ω
: 2.0V~6.0V
: 3.3V
: 15μA (TYP.) (VIN=3.6V)
: PWM/PFM Automatic
: 92% (TYP.)
(VIN=4.5V, V
: 500mA
: 600kHz (±15%)
: 10mV
: 100%
: -40℃ ～ +85℃
: SOT-25, USP-6B
(Constant Current & Latching)
OUT
=3.3V, I
OUT
=100mA)
IN
C
(ceramic)
CE
2
VSS
CE
34
VOUT
L
C
(ceramic)
1/13
XC9253R
■PIN CONFIGURATION
■PIN ASSIGNMENT
Lx VOUT
5 4
132
SOT-25
(TOP VIEW)
VSS CEVIN
Series
VIN 6
VSS 5
CE 4
USP-6B
(BOTTOM VIEW)
* Please short the VSS (No. 2 and 5) pin.
* The dissipation pad for the USP-6B 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 V
1 Lx
2 VSS
3 VOUT
SS (No. 5) pin.
PIN NUMBER
SOT-25 USP-6B
PIN NAME FUNCTION
1 6 VIN Power Input
2 2, 5 VSS Ground
3 4 CE Chip Enable
4 3 VOUT Output Voltage Sense
5 1 Lx Switching Output
■FUNCTIONS
CE OPERATION
VOLTAGE LEVEL
H Level
Synchronous PWM/PFM Automatic
XC9253Ｒ SERIES
Switching Control
L Level Stand-by
■PRODUCT CLASSIFICATION
●Ordering Information
PWM / PFM automatic switching control
PRODUCT NAME PACKAGE (ORDER UNIT)
XC9253R001MR-G
XC9253R001DR-G
(*1)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
(*1)
SOT-25 (3,000/Reel)
(*1)
USP-6B (3,000/Reel)
2/13
■BLOCK DIAGRAM
■ABSOLUTE MAXIMUM RATINGS
VOUT
R2
R1
VIN
VSS
NOTE: The signal from CE Control Logic to PWM/PFM Selector is being fixed to "H" level inside,
R3R4U.V.L.O.
and XC9253R series chooses only PWM/PFM automatic switching control.
Phase
Compensation
Error Amp.
Vref with
Soft Start,
CE
PWM/PFM
Selector
U.V.L.O. Cmp
Current Feedback
Current Limit
PWM
Comparator
Logic
Synch.
Buffer
Drive
Ramp Wave
Generator
OSC
CE
Control Logic
Lx
CE
PARAMETER SYMBOL RATINGS UNITS
VIN Pin Voltage VIN - 0.3 ~ 6.5 V
Lx Pin Voltage VLx - 0.3 ~ VIN + 0.3 V
VOUT Pin Voltage VOUT - 0.3 ~ 6.5 V
CE Pin Voltage VCE - 0.3 ~ VIN + 0.3 V
Lx Pin Current ILx ±1000 mA
Power Dissipation
SOT-25 250
USP-6B
Pd
100
Operating Ambient Temperature Topr - 40 ~ + 85 ℃
Storage Temperature Tstg - 55 ~ +125 ℃
XC9253R
Series
Ta=25℃
mW
3/13
)
XC9253R
■ELECTRICAL CHARACTERISTICS (Continued
XC9253R001xx
Series
V
OUT
=3.3V, f
=600kHz, Ta=25℃
OSC
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage V
OUT
When connected to external
components, VCE=VIN, I
OUT
=30mA
3.234 3.300 3.366 V ①
Operating Volt age Range VIN 2.0 - 6.0 V ①
Maximum Output Current I
U.V.L.O. Voltage V
OUTMAX
UVLO
VIN=V
external components (A series) (*7)
VCE=VIN, V
voltage holding "L" level (*1), (*9)
Supply Current IDD VIN=VCE=5.0V, V
Stand-by Current I
STB
Oscillation Frequency fosc
PFM Switch Current I
PFM
VIN=5.0V, VCE=0V,
V
OUT
When connected to external
components, I
When connected to external
components, VCE =VIN, I
Maximum IPFM Current MAXIPFM VIN=V
Maximum Duty Ratio MAXDTY VCE=VIN, V
Minimum Duty Ratio MINDTY VCE=V
+1.2V,
OUT
when connected to
=0V, Voltage which Lx pin
OUT
=set voltage×1.1V - 12 30 μA ③
OUT
=set voltage×1.1V
=100mA
OUT
+1.0V, VCE=VIN, I
OUT
=0V 100 - - % ④
OUT
- - 0 % ④
OUT=VIN
500 - - mA ①
1.00 1.40 1.78 V ②
- 0 1.0 μA ③
510 600 690 kHz ①
=1mA
OUT
=0.1mA 35 44 50 % ①
OUT
120 160 200 mA ①
When connected to external
Efficiency (*2) EFFI
Lx SW “H” ON Resistance R
Lx SW “L” ON Resistance R
Lx SW “H” Leak Current I
Lx SW “L” Leak Current I
Current Limit (*8) I
Output Voltage
Temperature Characteristics
V
OUT
CE “H” Voltage V
CE “L” Voltage V
CE “H” Current I
CE “L” Current I
Soft-Start Time tSS
△
LxH
LxL
LeakH
LeakL
LIM
V
・△
CEH
CEL
CEH
CEL
components, VCE=VIN=4.5V,
I
=100mA
OUT
VCE=0.5VIN, V
OUT
=0V, ILx=100mA (*3) - 0.5 1.0 Ω ⑤
- 92 - % ①
VCE=0.5VIN, ILx=100mA (*4) - 0.6 1.2 Ω ⑤
VIN=V
VIN=V
VIN=VCE=5.0V, V
I
OUT
OUT
Topr
-40℃≦Topr≦85℃
V
OUT
Lx determine "H" (*9)
V
OUT
Lx determine "L" (*9)
VIN=VCE=5.5V, V
VIN=5.5V, VCE=0V, V
When connected to external
components, VCE=0V→VIN, I
=5.0V, VCE=0V, Lx=0V (*5) - 0.01 1.0 μA ⑥
OUT
=5.0V, VCE =0V, Lx=5.0V - 0.01 1.0 μA ⑥
OUT
=0V 600 700 mA ⑦
OUT
=30mA
=0V, When CE voltage is applied
=0V, When CE voltage is applied
=0V - 0.1 - 0.1 μA ⑧
OUT
=0V - 0.1 - 0.1 μA ⑧
OUT
=1mA
OUT
- ±100 - ppm/ ℃ ①
0.65 - VIN V ⑧
VSS - 0.25 V ⑧
0.5 1.0 3.0 ms ①
When connected to external
Latch Time tlat
Test conditions: Unless otherwise stated, VIN=5.0V
External components L: 10μH, CIN: 4.7μF (ceramic) CL: 10μF (ceramic)
NOTE:
*1:Including hysteresis operating voltage range.
*2:EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3:On resistance (Ω)= Lx pin measurement voltage / 100mA
*4:Design value
*5:When temperature is high, a current of approximately 20μA (maximum) may leak.
*6: Time until it short-circuits VOUT with GND through 1Ωof resistance from a state of operation and is set to VOUT=0V from current limit
pulse generating.
*7: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.
*8: Current limit denotes the level of detection at peak of coil current..
*9: “H”=V
1.2V, “L”=+0.1V~-0.1V
IN~VIN-
components, VIN=VCE=5.0V,
Short V
by 1Ω resistance (*6)
OUT
1 - 20 ms ⑨
CIRCUIT
4/13
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