XC9206/XC9207/XC9208
Series
PWM, PWM / PFM Switchable Step-Down
DC / DC Converters With Driver Transistor Built-In
ETR0503_001
☆GO-Compatible
■GENERAL
DESCRIPTION
The XC9206/XC9207/XC9208 series is a group of DC/DC converters with a built-in 0.4Ω 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 1.0μA 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
Output Voltage Range
: ON resistance 0.4Ω
: 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
Current Limiter built-in
Input Voltage Range
Output Current
Maximum Duty Ratio
: Istb = 1μA (MAX.)
: 600mA
: 1.8V ~ 6.0V(XC9206/XC9207)
2.0V ~ 6.0V (XC9208)
: 500mA
: 100%
PWM/PFM Switching Control (XC9207 / XC9208)
Ceramic Capacitor Compatible
Soft start circuit built-in
Small Package
: SOT-25
■TYPICAL
APPLICATION CIRCUIT
■
TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current
XC9208A18C
VOUT=1.8V (Oscillation Frequency 1.2MHz)
CE/MODE
VOUT
4
CE/
MODE
VSS
3
2
100
90
80
70
60
50
40
30
20
10
0
0.1
CIN:4.7μ F,CL:10μ F, L:4.7μ H(CDRH3D16),
SD:CRS02, Topr=25℃
PWM/PFM
Switching Control
VIN=2.4V
3.6V
4.2V
PWM Control
VIN
5
CIN
(ceramic)
VIN
Lx
1
SD
CL
(ceramic)
L
SD
CL
C
IN
:4.7μF (CDRH 3D16,SUMIDA)
:CRS02 (SCHOTTKY DIODE,TOSHIBA)
:10μF (ceramic)
:4.7μF (ceramic)
Efficiency EFFI (%)
L
VOUT
(500mA)
1
10
100
1000
Output Current IOUT (mA)
1/15
XC9206/XC9207/XC9208
Series
■PIN
CONFIGURATION
VIN
CE/MODE
■PIN
ASSIGNMENT
PIN NUMBER PIN NAME
1
2
3
4
LX
V
SS
V
OUT
CE/MODE
V
IN
FUNCTION
Switching Output
Ground
Output Voltage Sense
Chip Enable/Mode Switch
Power Input
Lx
VSS
VOUT
5
SOT-25
(TOP VIEW)
■
PRODUCT CLASSIFICATION
●
Ordering Information
XC9206①②③④⑤⑥: PWM Control
XC9207①②③④⑤⑥: PWM / PFM Automatic Switching Control
XC9208①②③④⑤⑥: PWM Control, PWM / PFM Automatic Switching Control Manually Selectable
DESIGNATOR
①
DESCRIPTION
Type of DC/DC Converter
SYMBOL
A
09~40
②③
Output Voltage
09~40 & L
3
④
Oscillation Frequency
6
C
⑤
⑥
Package
Device Orientation
M
R
L
DESCRIPTION
: 600mA current limiter, Transistor built-in, output voltage
internally set (V
OUT
product), soft start internally set.
: 100mV increments
e.g. V
OUT
=1.5V→②=1,
③=5
: 1.85V V
OUT
→②=1, ③=L
2.85V V
OUT
→②=2, ③=L
: 300kHz
: 600kHz
: 1.2MHz
: SOT-25 (SOT-23-5)
: Embossed tape, standard feed
: Embossed tape, reverse feed
* Output voltage 0.9V ~ 4.0V (100mV increments), 1.85V and 2.85V are standard products.
Output voltage other than these are available as semi-custom products.
2/15
XC9206/XC9207/XC9208
Series
■
BLOCK DIAGRAM
Note: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside, and XC9206 series chooses
PWM control.
The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside, and XC9207 series chooses
only PWM/PFM automatic switching control.
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
V
IN
Pin Voltage
V
SS
Pin Voltage
Lx Pin Voltage
V
OUT
Pin Voltage
CE / MODE Pin Voltage
Lx Pin Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
IN
V
SS
V
Lx
V
OUT
V
CE
I
Lx
Pd
Topr
Tstg
RATINGS
- 0.3 ~ + 6.5
- 0.3 ~ + 6.5
- 0.3 ~ V
IN
+ 0.3
- 0.3 ~ + 6.5
- 0.3 ~ V
IN
+ 0.3
± 1000
250
- 40 ~ + 85
- 55 ~ + 125
Ta=25℃
UNITS
V
V
V
V
V
mA
mW
℃
℃
3/15
XC9206/XC9207/XC9208
Series
■
ELECTRICAL CHARACTERISTICS
XC9206A18CMR, XC9207A18CMR, XC9208A18CMR
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
U.V.L.O. Voltage
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
PFM Pulse Width Rate
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency (*2)
Lx SW ON Resistance
Current Limit
CE "H" Voltage
SYMBOL
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
DD1
I
DD2
I
STB
FOSC
PFMDTY
MAXDTY
MINDTY
EFFI
R
Lx
I
LIM
V
CEH
CONDITIONS
V
OUT
=1.8V, FOSC=1.2MHz, Ta=25℃
MIN.
TYP.
MAX. UNIT
V
V
mA
V
μA
μA
μA
CIRCUIT
When connected to ext. components
1.764 1.800 1.836
CE=V
IN
, I
OUT
=30mA
(XC9206, 9207) 1.8
-
6.0
(XC9208)
When connected to ext. components
CE=V
IN
, V
OUT
=0V,
Voltage which Lx pin voltage holding "L"
level (*1)
CE=V
IN
, V
OUT
=fixed voltage x 0.9V
CE=V
IN
, V
OUT
=fixed voltage x 1.1V
CE=V
SS
, V
OUT
=fixed voltage x 1.1V
When connected to ext. components
CE=V
IN
, I
OUT
=30mA
When connected to ext. components
(XC9207, XC9208 only), CE=V
IN
,
I
OUT
=1mA
CE=V
IN
, V
OUT
=0V
CE=V
OUT
=V
IN
When connected to ext. components,
CE=V
IN
, I
OUT
=100mA
CE=V
IN
, V
OUT
=0V, I
Lx
=400mA (*3)
V
IN
=CE=5.0V, V
OUT
=0V
V
OUT
=0V, When CE
voltage is applied Lx
determine "H"
(XC9206, 9207)
(XC9208)
2.0
500
1.00
-
-
-
-
-
1.40
255
98
0
6.0
-
1.78
413
158
1
①
①
①
②
③
③
③
①
①
②
②
①
④
④
⑤
1.020 1.200 1.380 MHz
24
100
-
-
-
-
1.2
0.9
V
SS
V
IN
-0.3
-
-0.1
-0.1
0.8
-
30
-
-
86
0.4
600
-
-
-
-
-
-
-
-
-
0.9
-
V
IN
V
V
IN
0.3
-
V
IN
-1.0
0.1
0.1
6.0
12.0
V
V
V
μA
μA
ms
ms
0
36
%
%
%
%
Ω
mA
CE "L" Voltage
PWM "H" Voltage
PWM "L" Voltage
CE "H" Current
CE "L" Current
Soft-Start Time
Latch Time
V
CEL
V
PWMH
V
PWML
I
CEH
I
CEL
T
SS
Tlat
V
OUT
=0V, When CE voltage is applied Lx
determine "L"
When connected to ext. components
(XC9208 only), I
OUT
=1mA (*4)
When connected to ext. components
(XC9208 only), I
OUT
=1mA (*4)
CE=V
IN
=5.5V, V
OUT
=0V
CE=0V, V
IN
=5.5V, V
OUT
=0V
When connected to ext. components
CE=0V
→
V
IN
, I
OUT
=1mA
When connected to ext. components
V
IN
=CE=5.0V, short V
OUT
by 1Ω
resistance (*5)
⑤
①
①
⑤
⑤
①
⑥
Test condition: Unless otherwise stated, V
IN
= 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 = V
Lx
(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 V
IN
minus 0.3
V, and to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than V
IN
minus 1.0 V and
equal to or greater than V
CEH
.
*5: Time until it short-circuits V
OUT
with GND through 1Ωof resistance from a state of operation and is set to V
OUT
=0V from current limit
pulse generating.
4/15
XC9206/XC9207/XC9208
Series
■
ELECTRICAL CHARACTERISTICS (Continued)
XC9206A25CMR, XC9207A25CMR, XC9208A25CMR
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
U.V.L.O. Voltage
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
PFM Pulse Width Rate
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency (*2)
Lx SW ON Resistance
Current Limit
CE "H" Voltage
CE "L" Voltage
PWM "H" Voltage
PWM "L" Voltage
CE "H" Current
CE "L" Current
Soft-Start Time
Latch Time
SYMBOL
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
DD1
I
DD2
I
STB
FOSC
PFMDTY
MAXDTY
MINDTY
EFFI
R
Lx
I
LIM
V
CEH
V
CEL
V
PWMH
V
PWML
I
CEH
I
CEL
T
SS
Tlat
CONDITIONS
V
OUT
=2.5V, FOSC=1.2MHz, Ta=25℃
MIN.
TYP.
MAX.
UNIT
V
V
mA
V
μA
μA
μA
MHz
%
%
0
%
%
0.9
-
V
IN
V
IN
0.3
-
V
IN
-1.0
0.1
0.1
6.0
12.0
Ω
mA
V
V
V
V
μA
μA
ms
ms
CIRCUIT
When connected to ext. components
2.450 2.500 2.550
CE=V
IN
, I
OUT
=30mA
(XC9206, 9207)
1.8
-
6.0
(XC9208)
When connected to ext. components
CE=V
IN
, V
OUT
=0V,
Voltage which Lx pin voltage holding "L"
level (*1)
CE=V
IN
, V
OUT
=fixed voltage x 0.9V
CE=V
IN
, V
OUT
=fixed voltage x 1.1V
CE=V
SS
, V
OUT
=fixed voltage x 1.1V
When connected to ext. components
CE=V
IN
, I
OUT
=30mA
When connected to ext. components
(XC9207, XC9208 only), CE=V
IN
,
I
OUT
=1mA
CE=V
IN
, V
OUT
=0V
CE=V
OUT
=V
IN
When connected to ext. components,
CE=V
IN
, I
OUT
=100mA
CE=V
IN
, V
OUT
=0V, I
Lx
=400mA (*3)
V
IN
=CE=5.0V, V
OUT
=0V
V
OUT
=0V, When CE
(XC9206, 9207)
voltage is applied Lx
(XC9208)
determine "H"
V
OUT
=0V, When CE voltage is applied Lx
determine "L"
When connected to ext. components
(XC9208 only), I
OUT
=1mA (*4)
When connected to ext. components
(XC9208 only), I
OUT
=1mA (*4)
CE=V
IN
=5.5V, V
OUT
=0V
CE=0V, V
IN
=5.5V, V
OUT
=0V
When connected to ext. components
CE=0V
→V
IN
, I
OUT
=1mA
When connected to ext. components
V
IN
=CE=5.0V, short V
OUT
by 1Ω
resistance (*5)
2.0
500
1.00
-
-
-
-
-
1.40
255
98
0
6.0
-
1.78
413
158
1
①
①
①
②
③
③
③
①
①
②
②
①
④
④
⑤
⑤
①
①
⑤
⑤
①
1.020 1.200 1.380
24
100
-
-
-
-
1.2
0.9
V
SS
V
IN
-0.3
-
-0.1
-0.1
0.8
-
30
-
-
91
0.4
600
-
-
-
-
-
-
-
-
-
36
⑥
Test condition : Unless otherwise stated, V
IN
= 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 = V
LX
(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 V
IN
minus 0.3
V, and to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than V
IN
minus 1.0 V and
equal to or greater than V
CEH
.
*5 : Time until it short-circuits V
OUT
with GND through 1Ω of resistance from a state of operation and is set to V
OUT
=0V from current
limit pulse generating.
5/15
