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PDF XC9207 Data sheet ( Hoja de datos )
| Número de pieza | XC9207 | |
| Descripción | (XC9206 - XC9208) PWM/PFM Switchable Step-Down DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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XC9206/XC9207/XC9208 Series
ETR0503_002
PWM, PWM / PFM Switchable Step-Down
DC / DC Converters With Driver Transistor Built-In
GO-Compatible
GENERAL DESCRIPTION
The XC9206/XC9207/XC9208 series is a group of DC/DC converters with a built-in 0.4 P-channel driver transistor, offered
in a SOT-25 package. The ICs are designed to provide high efficiencies and a stable power supply with an output current of
500mA using only a coil, a diode and two ceramic capacitors connected externally.
Minimum operating voltage of the XC9206/9207 is 1.8V and 2.0V for XC9208. Output voltage is internally programmable in
a range from 0.9V to 4.0V in 100mV increments (accuracy: ±2.0%). Oscillation frequency is selectable from 300kHz, 600kHz
and 1.2MHz so that the frequency best suited to your particular application can be selected. Each series features different
operation modes: PWM control (XC9206 series), automatic PWM/PFM switching control (XC9207 series) and manual
PWM/PFM switching control (XC9208 series). The series gives fast transient 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 stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0 A or less.
With the built-in U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input
voltage becomes 1.4V or lower.
APPLICATIONS
Mobile phones
(PDC, GSM, CDMA, IMT2000 etc.)
PDAs, Portable communication modems
Portable games
Cameras, digital cameras
Cordless phones
Note book computers
FEATURES
P-ch driver Tr. Built-in : ON resistance 0.4
Output Voltage Range : 0.9V ~ 4.0V
(100mV increments)
Fixed output voltage accuracy ±2%
Oscillation Frequency : 300kHz, 600kHz, 1.2MHz
Fixed oscillation frequency
Accuracy ±15%
Stand-by function
: Istb = 1 A (MAX.)
Current Limiter built-in
: 600mA
Input Voltage Range
: 1.8V ~ 6.0V(XC9206/XC9207)
2.0V ~ 6.0V (XC9208)
Output Current
: 500mA
Maximum Duty Ratio
: 100%
PWM/PFM Switching Control (XC9207 / XC9208)
Ceramic Capacitor Compatible
Soft start circuit built-in
Small Package
: SOT-25
TYPICAL APPLICATION CIRCUIT
CE/MODE
4
CE/ VOUT
MODE
3
VSS 2
VIN
5 VIN
Lx 1
CIN
(ceramic)
L
SD
VOUT
(500mA)
CL
(ceramic)
L :4.7 F (CDRH 3D16,SUMIDA)
SD :CRS02 (SCHOTTKY DIODE,TOSHIBA)
CL :10 F (ceramic)
CIN :4.7 F (ceramic)
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
XC9208A18C
VOUT=1.8V (Oscillation Frequency 1.2MHz)
CIN:4.7 F,CL:10 F, L:4.7 H(CDRH3D16),
100
90
80
70
PWM/PFM
Switching Control
SD:CRS02, Topr=25
VIN=2.4V
60 3.6V
50
40
30 PWM Control
4.2V
20
10
0
0.1 1
10 100 1000
Output Current IOUT (mA)
1/16
1 page  
XC9206/XC9207/XC9208
Series
ELECTRICAL CHARACTERISTICS (Continued)
XC9206A25CMR, XC9207A25CMR, XC9208A25CMR
VOUT=2.5V, FOSC=1.2MHz, Ta=25
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT CIRCUIT
Output Voltage
VOUT
Operating Voltage Range VIN
Maximum Output Current IOUTMAX
U.V.L.O. Voltage
VUVLO
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
IDD1
IDD2
ISTB
FOSC
PFM Pulse Width Rate PFMDTY
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency (*2)
Lx SW ON Resistance
Current Limit
MAXDTY
MINDTY
EFFI
RLx
ILIM
CE "H" Voltage
VCEH
CE "L" Voltage
PWM "H" Voltage
PWM "L" Voltage
CE "H" Current
CE "L" Current
Soft-Start Time
VCEL
VPWMH
VPWML
ICEH
ICEL
TSS
Latch Time
Tlat
When connected to ext. components
CE=VIN, IOUT=30mA
(XC9206, 9207)
(XC9208)
When connected to ext. components
CE=VIN, VOUT=0V,
Voltage which Lx pin voltage holding "L"
level (*1)
CE=VIN, VOUT=fixed voltage x 0.9V
CE=VIN, VOUT=fixed voltage x 1.1V
CE=VSS, VOUT=fixed voltage x 1.1V
When connected to ext. components
CE=VIN, IOUT=30mA
When connected to ext. components
(XC9207, XC9208 only), CE=VIN,
IOUT=1mA
CE=VIN, VOUT=0V
CE=VOUT=VIN
When connected to ext. components,
CE=VIN, IOUT=100mA
CE=VIN, VOUT=0V, ILx=400mA (*3)
VIN=CE=5.0V, VOUT=0V
VOUT=0V, When CE
voltage is applied Lx
determine "H"
(XC9206, 9207)
(XC9208)
VOUT=0V, When CE voltage is applied Lx
determine "L"
2.450 2.500 2.550
1.8 - 6.0
2.0 - 6.0
500 -
-
1.00 1.40 1.78
- 255 413
- 98 158
- 01
1.020 1.200 1.380
24 30 36
100 -
--
0
- 91
- 0.4 0.9
- 600 -
1.2 - VIN
0.9 - VIN
VSS - 0.3
V
V
mA
V
A
A
A
MHz
%
%
%
%
Ω
mA
V
V
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
VIN-0.3 -
-
V
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
CE=VIN=5.5V, VOUT=0V
CE=0V, VIN=5.5V, VOUT=0V
When connected to ext. components
CE=0V →VIN, IOUT=1mA
- - VIN-1.0 V
-0.1 - 0.1
-0.1 - 0.1
A
A
0.8 - 6.0 ms
When connected to ext. components
VIN=CE=5.0V, short VOUT by 1Ω
resistance (*5)
- - 12.0 ms
①
①
①
②
③
③
③
①
①
②
②
①
④
④
⑤
⑤
①
①
⑤
⑤
①
⑥
Test condition : Unless otherwise stated, VIN = 3.6V
NOTE:
*1 : Including hysteresis operating voltage range.
*2 : EFFI = [ (output voltage x output current) / (input voltage x input current) ] x 100
*3 : On resistance = VLX (measurement voltage) / 0.4
*4 : The CE/MODE pin of the XC9208A 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 PWM mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3
V, and to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and
equal to or greater than VCEH.
*5 : 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.
5/16
5 Page 
XC9206/XC9207/XC9208
Series
NOTES ON USE (Continued)
Instructions on Pattern Layout
1. In order to stabilize VDD's voltage level, we recommend that a by-pass capacitor (CIN) be connected as
close as possible to the VIN & VSS pins.
2. Please mount each external component as close to the IC as possible, and connect it to GND with the
shortest possible PCB traces.
3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce
the circuit impedance.
4. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by
high ground currents at the time of switching may result in instability.
5. Please connect SD anode directly to the by-pass capacitor CIN (-) in order to minimize SD noise affect on to
the VSS pin of the IC. Also, take distance between the VSS pin and the SD anode for having large impedance
as possible. We recommend that a ferrite bead mount pattern be arranged for the case that the SD noise
can not be reduced by using the pattern layout as shown below.
6. Please do not make the traces under the IC to carry switching main current. It may cause a malfunction of
the IC.
<TOP VIEW>
VSS
CE
VIN
<BOTTOM VIEW>
VOUT
L
XC9206/07/08
R.1.1 SD
SOT-25
Ferrite Bead
Figure XC9206/07/08Series Pattern Layout
11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet XC9207.PDF ] | |
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