XC9206 / 9207/ 9208 Series
PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In
September 17, 2003 Ver. 2
!
P-Channel Driver Transistor Built-In
!
Input Voltage Range
!
Output Voltage Range
!
Oscillation Frequency
!
Output Current
!
Maximum Duty Ratio
!
Small Package
!
Ceramic Capacitor Compatible
: 1.8V ~ 6.0V (XC9206/XC9207)
: 2.0V ~ 6.0V (XC9208)
: 0.9V ~ 4.0V
: 300kHz, 600kHz, 1.2MHz
: 500mA
: 100%
: SOT-25
"
APPLICATIONS
#
Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)
#
PDA, Portable communication modem
#
Portable game
#
Camera, Digital camera, Camcorder
#
Cordless phone
#
Note book computer
!
PWM/PFM Switching Control (XC9207 / XC9208)
"
GENERAL DESCRIPTION
The XC9206/9207/9208 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 increments of 100mV (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.
"
FEATURES
P ch driver Tr. Built-in
Output Voltage Range
ON resistance 0.4Ω
0.9V ~ 4.0V (100mV steps)
Fixed output voltage accuracy ±2%
Oscillation Frequency
300kHz, 600kHz, 1.2MHz
Fixed oscillation frequency
accuracy ±15%
Stand-by function
Current Limiter Circuit built-in
Small Package
Soft start circuit built-in
Istb = 1µA (MAX.)
600mA
SOT-25
"
TYPICAL APPLICATION CIRCUIT
CE/MODE
"
TYPICAL PERFORMANCE CHARACTERISTICS
VOUT
4
CE/
MODE
VSS
3
2
XC9208A18C
VOUT=1.8V (Oscillation Frequency 1.2MHz)
CIN:4.7µF,CL:10µF, L:4.7µH(CDRH3D16),
SD:CRS02, Topr=25
O
C
VIN
5
CIN
(ceramic)
VIN
Lx
L
1
SD
VOUT
(500mA)
Efficiency EFFI (%)
CL
(ceramic)
100
90
80
70
60
50
40
30
20
10
0
0.1
PWM/PFM
Switching Control
VIN=2.4V
3.6V
4.2V
PWM
Control
1
10
100
1000
Output Current IOUT (mA)
Semiconductor Ltd.
Data Sheet
1
XC9206 / 9207/ 9208 Series
PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In
"
PIN CONFIGURATION
VIN
CE/MODE
"
PIN ASSIGNMENT
PIN NUMBER
1
2
3
4
PIN NAME
LX
VSS
VOUT
CE/MODE
VIN
FUNCTIONS
Switching Output
Ground
Output Voltage Sense
Chip Enable/Mode Switch
Power Input
5
4
1
Lx
2
3
5
VSS
VOUT
SOT-25 (TOP VIEW)
"
PRODUCT CLASSIFICATION
#
Ordering Information
XC9206
1
23456
XC9207
1 2 3 4 5 6
XC9208
1 2 3 4 5 6
SYMBOL
: PWM Control
: PWM / PFM Automatic Switching Control
: PWM control, PWM / PFM Automatic Switching Control Manually Selectable
DESCRIPTION
Transistor built-in, output voltage internally set (VOUT product), soft start internally set.
1
A : Current Limiter 600mA
Denotes output voltage :
ex. ) 1.5V Output
!
1.85V Output
!
2.85V Output
!
2, 3
2
= 1,
3
= 5
2
= 1,
3
= L
2
= 2,
3
= L
Denotes oscillation frequency :
4
3 : 300kHz
6 : 600kHz
C : 1.2MHz
Denotes package types :
5
6
M : SOT-25
Denotes device orientation :
R : Embossed Tape : Standard Feed
L : Embossed Tape : Reverse Feed
* Output voltage 0.9V ~ 4.0V (100mV steps), 1.85V and 2.85V are standard products.
Output voltages other than these are available as semi-custom products.
"
PACKAGING INFORMATION
$
SOT-25
Semiconductor Ltd.
Data Sheet
2
XC9206 / 9207/ 9208 Series
PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In
"
MARKING RULE
$
SOT-25
1
5
4
Represents the product name and the type of DC/DC converters
DESIGNATOR
PRODUCT NAME
XC9206A x x x M x
XC9207A x x x M x
XC9208A x x x M x
6
1234
1
2
SOT-25
(TOP VIEW)
7
8
* Character inversion is used.
3
2
Represents the integer of the output voltage and the oscillation frequency
DESIGNATOR
FOSC=300kHz
(XC920 x x
2
x 3M x)
0
1
2
3
4
FOSC=600kHz
(XC920 x x
2
x 6M x)
0
1
2
3
4
FOSC=1.2MHz
(XC920 x x
2
x CM x)
A
B
C
D
E
OUTPUT VOLTAGE
0. X
1. X
2. X
3. X
4. X
3
Represents the decimal number of output voltage and the oscillation frequency
DESIGNATOR
FOSC=300kHz
(XC920 x x x
3
3M x)
0
1
2
3
4
5
6
7
8
Z
FOSC=600kHz
(XC920 x x x
3
6M x)
A
B
C
D
E
F
H
K
L
Y
FOSC=1.2MHz
(XC920 x x x
3
CM x)
A
B
C
D
E
F
H
K
L
Y
OUTPUT VOLTAGE
X. 0
X. 1
X. 2
X. 3
X. 4
X. 5
X. 6
X. 7
X. 8
X. 85
X. 9
9
M
M
* Output voltage 0.9V ~ 4.0V (100mV steps), 1.85V and 2.85V are standard products.
Output voltages other than these are available as semi-custom products.
4
Represents the production lot number.
0 to 9, A to Z repeated (G, I, J, O, Q, W excepted)
Semiconductor Ltd.
Data Sheet
3
XC9206 / 9207/ 9208 Series
PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In
"
BLOCK DIAGRAM
VOUT
R1
Phase
Compensation
PWM
Comparator
Buffer
Driver
Pch
Driver
Tr.
VIN
R2
Error Amp.
Logic
LX
Vref with
Soft Start,
CE
PWM/PFM
Selector
Current
Limit & Feedback
U.V.L.O Comp.
U.V.L.O
Ramp Wave
Generator,
OSC
CE/MODE
Control
Logic
CE/MODE
VSS
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
Ta = 25
O
C
PARAMETER
VIN Pin Voltage
Lx Pin Voltage
VOUT Pin Voltage
CE / MODE Pin Voltage
Lx Pin Current
Continuous Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
VIN
VLx
VOUT
VCE
ILx
Pd
Topr
Tstg
RATINGS
- 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
UNITS
V
V
V
V
mA
mW
O
O
C
C
Semiconductor Ltd.
Data Sheet
4
XC9206 / 9207/ 9208 Series
PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In
"
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
SYMBOL
VOUT
VIN
IOUTMAX When connected to ext. components
VUVLO
IDD1
IDD2
Istb
FOSC
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
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
PFMDTY
MAXDTY
MINDTY
EFFI
RLx
ILIM
VCEH
VCEL
VPWMH
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, XC9207)
(XC9208)
100
-
-
-
-
1.2
0.9
VSS
VIN-0.3
-
-
86
0.4
600
-
-
-
-
0.9
-
VIN
VIN
0.3
-
V
V
0
%
%
%
Ω
mA
V
24
30
36
%
CONDITIONS
When connected to ext. components
CE=VIN, IOUT=30mA
(XC9206, 9207)
(XC9208)
1.8
2.0
500
1.00
-
-
-
1.020
-
-
-
1.40
255
98
0
1.200
6.0
6.0
-
1.78
413
158
1
1.380
mA
V
µA
µA
µA
MHz
V
VOUT=1.8V, FOSC=1.2MHz, Ta=25
O
C
MIN
1.764
TYP
1.800
MAX
1.836
UNIT
V
CIRCUIT
1
1
1
2
3
3
3
1
1
2
2
1
4
4
5
5
1
1
5
5
1
6
VOUT=0V, When CE voltage is applied Lx determine "L"
When connected to ext. components (XC9208 only)
IOUT=1mA (*4)
PWM "L" Voltage
CE "H" Current
CE "L" Current
Soft start time
VPWML
ICEH
ICEL
TSS
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
When connected to ext. components
VIN=CE=5.0V, short VOUT by 1Ω resistance (*5)
-
-0.1
-0.1
0.8
-
-
-
-
VIN-1.0
0.1
0.1
6.0
V
µA
µA
ms
Latch Time
Tlat
-
-
12.0
ms
Test condition : Unless otherwise stated, VIN = 3.6V
*1
*2
*3
*4
Including Hysteresis operating voltage range.
EFFI = [ (Output Voltage x Output Current) / (Input Voltage x Input Current) ] x 100
On resistance = VLx (measurement voltage) / 0.4
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
Ω
of resistance from a state of operation and is set to VOUT=0V from current limit pulse
generating.
Semiconductor Ltd.
Data Sheet
5
