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PDF XC9225 Data sheet ( Hoja de datos )
| Número de pieza | XC9225 | |
| Descripción | Synchronous Step-Down DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
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Hay una vista previa y un enlace de descarga de XC9225 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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XC9225/XC9226/XC9227 Series
Synchronous Step-Down DC/DC Converters
ETR0507_004
GreenOperation Compatible
GENERAL DESCRIPTION
The XC9225/XC9226/XC9227 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.6
P-channel driver transistor and 0.7 N-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 (A~D series) and 600mA (E~H series) to be
configured using only a coil and two capacitors connected externally. Minimum operating voltage is 2.0V~6.0V (A~D series),
4.5V~5.5V (E~H series). Output voltage is internally programmable in a range from 0.9V to 4.0V (A~D series) and 3.0~4.0V
(E~H series) in increments of 0.05V (accuracy: 2.0%). With the built-in oscillator, oscillation frequency is selectable from
600kHz and 1.2MHz to make available the frequency best suited to your particular application. As for operation mode, the
XC9225 series is PWM control, the XC9226 series is automatic PWM/PFM switching control and the XC9227 series can be
manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, 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 1.0 A 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
(250mW) and USP-6B (100mW), are available.
APPLICATIONS
Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)
Bluetooth equipment
PDAs, Portable communication modem
Portable games
Cameras, Digital cameras
Cordless phones
Notebook computers
FEATURES
P-Ch Driver Tr. Built-In
N-Ch DriverTr. built-in
Input Voltage Range
: ON resistance 0.6
: ON resistance 0.7
: 2.0V~6.0V (A~D series)
Output Voltage Range
4.5V~5.5V (E~H series)
: 0.9V~4.0V (A~D series)
3.0V~4.0V (E~H series)
(0.05V increments)
Low Power Consumption : 15 A (TYP.) (VIN=3.6V, VOUT=1.8V)
Control Method
: Fixed PWM (XC9225)
PWM/PFM Automatic (XC9226)
High Efficiency
PWM/PFM Manual (XC9227)
: 92% (TYP.)
Output Current
(VIN=3.0V, VOUT=1.8V, IOUT=100mA)*
: 500mA *(A~D series)
Oscillation Frequency
Low Output Ripple
Maximum Duty Ratio
Soft-Start Circuit Built-In
600mA *(E~H series)
: 600kHz, 1.2MHz ( 15%)
: 10mV
: 100%
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
Packages
: SOT-25 (SOT-23-5), USP-6B
* Performance depends on external components and wiring on the PCB
TYPICAL APPLICATION CIRCUIT
V IN
C IN
( c er amic )
CE/ MO DE
1 VIN
Lx 5
2 VSS
3
CE/
MODE
V OUT
4
L
VOUT
500mA (600mA)
CL
( c er amic )
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
XC9227A18C
L=4.7uH( NR3015) ,CIN=4.7uF( c er amic ) ,
CL=10uF( c er amic ) ,Topr =25
100
90
80
70
60
50
40 V IN=5.0V
30 V IN=3.6V
20
V IN=2.7V
10
0
0.1
1 10 100
Output Current:IOUT(mA )
1000
PWM/PFM A utomatic Sw itching Control
PWM Control
1/21
1 page  
XC9225/XC9226/XC9227
Series
ELECTRICAL CHARACTERISTICS
XC9225A18Cxx, XC9226A18Cxx, XC9227A18Cxx
PARAMETER
SYMBOL
CONDITIONS
Output Voltage
VOUT
When connected to external components,
CE=VIN, IOUT=30mA
Operating Voltage Range VIN
-
Maximum Output Current IOUTMAX
UVLO Voltage
VUVLO
VIN=<T-1>V,
When connected to external components
(A series) (*10)
CE=VIN, VOUT=0V, Voltage which Lx pin
voltage holding "L" level (*1), (*12)
Supply Current
IDD VIN=CE=3.6V, VOUT=set voltage 1.1V
Stand-by Current
Oscillation Frequency
PFM Switch Current
Istb
fOSC
IPFM
VIN=3.6V, CE=0V,
VOUT=set voltage 1.1V
When connected to external components,
IOUT=100mA
When connected to external components,
CE=VIN, IOUT=0.1mA
Maximum IPFM Limit MAXIPFM VIN=VOUT+1.0V, CE=VIN, IOUT=0.1mA
Maximum Duty Ratio MAXDTY CE=VIN, VOUT=0V
Minimum Duty Ratio MINDTY CE=VOUT=VIN
Efficiency (*2)
EFFI
When connected to external components,
CE=VIN=3.0V, IOUT=100mA
Lx SW “H” ON Resistance RLxH CE=0.5VIN, VOUT=0V, ILx=100mA (*3)
Lx SW “L” ON Resistance RLxL CE=0.5VIN, ILx=100mA (*4)
Lx SW “H” Leak Current ILeakH VIN=VOUT=5.0V, CE=0V, Lx=0V (*5)
Lx SW “L” Leak Current ILeakL VIN=VOUT=5.0V, CE=0V, Lx=5.0V
Current Limit (*11)
ILIM VIN=CE=5.0V, VOUT=0V (A series)
Output Voltage
VOUT
Temperature Characteristics VOUT topr
CE “H” Voltage
VCEH
CE “L” Voltage
VCEL
PWM “H” Level Voltage VPWMH
PWM “L” Level Voltage VPWML
IOUT=30mA
-40 Topr 85
VOUT=0V, When CE voltage is applied Lx
determine "H"(*12)
VOUT=0V, When CE voltage is applied Lx
determine "L" (*12)
When connected to external components,
IOUT=1mA (*6)
When connected to external components,
IOUT=1mA (*6)
CE “H” Current
ICEH
VIN=CE=5.5V, VOUT=0V
CE “L” Current
ICEL VIN=5.5V, CE=0V, VOUT=0V
Soft-Start Time
Latch Time
tSS
When connected to external components,
CE=0V VIN, IOUT=1mA
When connected to external components,
tlat VIN=CE=5.0V,
Short VOUT by 1 resistance (*7)
Test conditions: Unless otherwise stated, VIN=3.6V
External components L: 4.7uH (CDRH4D18C), CIN: 4.7uF (ceramic) CL: 10uF (ceramic)
VOUT=1.8V, fOSC=1.2MHz, Ta=25
MIN. TYP. MAX. UNIT CIRCUIT
1.764 1.800 1.836 V
2.0 - 6.0 V
500 -
- mA
1.00 1.40 1.78
- 15 35
- 0 1.0
V
A
A
1020 1200 1380 kHz
120 160 200 mA
35 44 50 %
100 -
-%
- - 0%
- 90 - %
- 0.6 1.2
- 0.7 1.4
- 0.01 1.0
- 0.01 1.0
600 700
-
A
A
mA
- 100 - ppm/
0.65 -
VIN V
VSS - 0.25 V
- - VIN- 1.0 V
VIN - 0.3 -
-V
- 0.1
- 0.1
-
-
0.1
0.1
A
A
0.5 1.0 3.0 ms
1 - 20 ms
<T-1> refers to the below values.
Setting voltage 1.5V>VOUT>0.9V
Setting voltage 1.8V>VOUT>1.5V
Setting voltage 4.0V>VOUT>1.8V
T-1=2.4V
T-1=3.0V
T-1=VOUT+1.2V
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage output current ) ( input voltage input current) } 100
*3: On resistance ( )= Lx pin measurement voltage 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 20 A (maximum) may leak.
*6: The CE/MODE pin of the XC9227A series works also as an external PWM control and PWM/PFM control switching pin. When the IC is
in the operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater
than VIN minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or
greater than VCEH.
*7: Time until it short-circuits VOUT with GND through 1 of resistance from a state of operation and is set to VOUT=0V from current limit
pulse generating.
*8:There is no PFM switch current for XC9225 series. The PFM switch current is only for XC9226/9227 series.
*9:There is no PWM "H" Level Voltage or PWM "L" Level Voltage for XC9225/9226 series. The characteristics are only for XC9227 series.
*10: 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.
*11: Current limit denotes the level of detection at peak of coil current..
*12: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
5/21
5 Page 
NOTES ON USE (Continued)
Reference Pattern Layout
SOT-25
L
VIN
CIN
VSS
VOUT
IC CL
USP-6B
CE VSS
* Please use an electric wire for VIN, VOUT, VSS and CE.
L
VOUT
CIN
IC
VIN
CE
VSS VSS
* Please use an electric wire for VIN, VOUT, VSS and CE.
XC9225/XC9226/XC9227
Series
Ceramic_Cap
Inductor
Ceramic_Cap
Inductor
11/21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet XC9225.PDF ] | |
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