XC9211/ 9212 Series
Preliminary
P channel Driver Transistor Built-In
Synchronous (N channel Switching Transistor Built-in)
Input Voltage Range
Output Voltage Range
Oscillation Frequency
Output Current
Maximum Duty Ratio
: 1.8V ~ 6.0V
: 0.9V ~ 4.0V
: 300kHz, 600kHz, 900kHz
: 400mA
: 100%
Driver Transistor Built-In Step-Down DC/DC Converters
Synchronous PWM, Non Synchronous PWM/PFM Switchable
November 18, 2002 Ver. 2
Applications
Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)
PDA, Portable communication modem
Portable game
Camera, Digital camera
Cordless phone
Note book computer
PWM/PFM Switching Control (XC9212 : Non Synchronous)
Ceramic Capacitor Compatible
Ultra Small Packages : SOT-25 & USP-6B
General Description
The XC9211/9212 series is a group of synchronous-rectification
type DC/DC converters with a built-in 0.6
Ω
P-channel driver
transistor and 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 400 mA to be
configured using only a coil and two capacitors connected
externally.
Minimum operating voltage is 1.8 V. Output voltage is internally
programmable in a range from 0.9 V to 4.0 V in increments of
0.1 V (accuracy:
±
2.0%). With the built-in oscillator, oscillation
frequency is selectable from 300 kHz, 600 kHz and 900 kHz to
make available the frequency best suited to your particular
application. As for operation mode, the XC9211 series is of a
synchronous-rectified PWM control type, while the XC9212
series can be manually switched between the PWM control
mode with synchronous rectification and the automatic
PWM/PFM switching control mode with non synchronous
rectification, 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 0.5
µA
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 1.6 V or lower. Two types of
packages, 250 mW (SOT-25) and 100 mW (USP-6B), are
available depending on applications.
Features
P ch driver Tr. Built-in
: On resistance 0.6Ω
N ch driver Tr. Built-in : On resistance 0.6Ω (Synchronous)
Output Voltage Range : 0.9V ~ 4.0V (0.1V step)
Fixed output voltage accuracy
±2%
Oscillation Frequency
: 300kHz, 600kHz, 900kHz
Fixed oscillation frequency
accuracy ±15%
Stand-by function
Soft start circuit built-in
Current limiter circuit built-in
: 600mA
: Istb = 0.5µA (max.)
Typical Application Circuit
V
IN
L
1
V
IN
Lx
5
V
OUT
(400mA)
Electrical Characteristics
XC9212A186
Output Voltage 1.8V Fixed, FOSC : 600kHz
L=10µH (CDRH4D18)
CIN=4.7µF (Ceramic), CL=10µF (Ceramic)
100
PWM/PFM Automatic Switch (Non-Synchronous)
Efficiency EFFI (%)
C
IN
(ceramic) 2 V
SS
CE/MODE
3 CE/ V
OUT
MODE
(
)
SD *
C
L
(ceramic)
80
60
40
20
0
4
PWM (Synchronous)
3.6V
VIN=2.4
1
10
100
1000
L
CL
CIN
SD
: 10µH (SUMIDA CDRH4D18)
: 10µH (Ceramic)
: 4.7µH (Ceramic)
: CRS02 (TOSHIBA Schottky Diode)
0.1
Output Current I
OUT
(mA)
* SD is externally set up for XC9212 series when used in non-synchronous PWM operation with large current.
1
XC9211/ 9212 Series
Preliminary
Pin Configuration
L
x
5
V
OUT
4
L
X
1
V
SS
2
V
OUT
3
1
V
IN
2
V
SS
SOT-25
(Top View)
3
CE/MODE
USP-6B
(Top View)
6
5
4 CE/MODE
V
IN
V
SS
Driver Transistor Built-In Step-Down DC/DC Converters
Synchronous PWM, Non Synchronous PWM/PFM Switchable
November 18, 2002 Ver. 2
Pin Assingment
Pin Number
SOT-25
1
2
3
4
5
USP-6B
6
2, 5
4
3
1
Pin Name
V
IN
V
SS
CE / MODE
V
OUT
LX
Functions
Power Input
Ground
Chip Enable Mode Switch
Output Voltage Sense
Switching Output
Product Classification
Ordering Information
23456
XC9212
1 2 3 4 5 6
XC9211
1
: PWM Control (Synchronous)
: Synchronous PWM / Non-synchronous PWM / PFM Automatic Switching, Manual Switching
(Synchronous PWM control : CE = "H")
(Non-synchronous PWM / PFM Automatic Switching : CE " M")
Symbol
Description
Transistor Built-in, Output voltage Internally set (VOUT product), Soft start Internally set.
A : Current Limiter 600mA
Denotes Output voltage :
2
= 1,
3
= 5
ex. ) 1.5V Output
Denotes Oscillation frequency :
1
2, 3
4
3 : 300kHz
6 : 600kHz
9 : 900kHz
Denotes Package Types :
5
M : SOT-25
D : USP-6B
Denotes Device Orientation :
6
R : Embossed Tape : Standard Feed
L : Embossed Tape : Reverse Feed
2
XC9211/ 9212 Series
Preliminary
Driver Transistor Built-In Step-Down DC/DC Converters
Synchronous PWM, Non Synchronous PWM/PFM Switchable
November 18, 2002 Ver. 2
Block Diagram
V
OUT
Phase
Compensation
PWM
Comparator
Pch
Driver
Tr.
V
IN
Error Amp.
Vref with
Soft Start,
CE
Logic
Buffer
Driver
L
X
Nch
SW
Tr.
PWM/PFM
Selector
Current
Limit & Feedback
Ramp Wave
Generator,
OSC
CE/MODE
Control
Logic
U.V.L.O Comp.
U.V.L.O
CE/MODE
V
SS
Absolute Maximum Ratings
Ta = 25
O
C
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
SOT-25
USP-6B
Operational Ambient Temperature
Storage Temperature
Topr
Tstg
Symbol
V
IN
V
SS
V
LX
V
OUT
V
CE
I
LX
Pd
Ratings
- 0.3 ~ + 6.5
- 0.3 ~ + 6.5
- 0.3 ~ + 6.5
- 0.3 ~ + 6.5
- 0.3 ~ + 6.5
±
600
250
100
- 40 ~ + 85
- 40 ~ + 125
O
O
Units
V
V
V
V
V
mA
mW
C
C
3
XC9211/ 9212 Series
Preliminary
Electrical Characteristics
XC9211A186, XC9212A186
Parameter
Output Voltage
Max. Input Voltage
Min. Operating Voltage
U.V.L.O Voltage
Max. Output Current
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
Max. Duty Cycle
Min. Duty Cycle
PFM pulse width rate * 2
Efficiency *3
LX SW "H" On Resistance *4
LX SW "L" On Resistance *4
Current Limit
CE "H" Voltage
PWM "H" Voltage *5
PWM "L" Voltage *5
CE "L" Voltage
CE "H" Current
CE "L" Current
Soft start time
Symbol
V
OUT1
V
IN
max
V
IN
min
V
UVLO
Driver Transistor Built-In Step-Down DC/DC Converters
Synchronous PWM, Non Synchronous PWM/PFM Switchable
November 18, 2002 Ver. 2
V
OUT
=1.8V, FOSC=600kHz, Ta=25
O
C
Test Conditions
When connected to ext. compoments
Min.
1.764
5.5
Typ.
1.800
Max.
1.836
Units
V
V
I
OUT
=30mA
1.8
Voltage which LX pin voltage holding "L" level
V
V
mA
µA
µA
1.4
400
160
30
0.5
510
100
0
25
85
0.6
0.6
600
1.2
V
IN
- 0.2
V
IN
- 1.0
V
SS
- 0.1
- 0.1
6.0
0.3
0.1
0.1
600
690
I
OUT
max
When connected to ext. compoments
I
DD1
I
DD2
I
STB
FOSC
MAXDTY
MINDTY
No ext. components,
CE=V
IN
, V
OUT
=fixed voltage x 0.9
No ext. components,
CE=V
IN
, V
OUT
=fixed voltage x 1.1
No ext. components, CE=V
OUT
=0V
When connected to ext. compoments
µA
kHz
%
%
%
%
Ω
Ω
mA
V
V
V
V
µA
µA
ms
I
OUT
=30mA
V
OUT
=V
SS
V
OUT
=V
IN
PFMDTY
When connected to ext. components / No load
I
OUT
=100mA
EFFI
R
LXH
R
LXL
I
LIM
V
CEH
V
PWMH
V
PWML
V
CEL
I
CEH
I
CEL
T
SS
CE=V
IN
, I
LX
=400mA, V
OUT
=fixed vol. x 0.9
CE=V
IN
, I
LX
=400mA, V
OUT
=fixed vol. x 1.1
V
IN
=5.0V
No Ext. components
When CE/MODE voltage is applied, LX determine "H"
When connected to ext. components
, I
OUT
=1mA
When Connected to ext. components
, I
OUT
=1mA
No Ext. components
When CE/MODE voltage is applied, LX determine "L"
CE=V
IN
=5.5V, V
OUT
=0V
CE=0V, V
IN
=5.5V, V
OUT
=0V
When connected to ext. components
CE=0V 2.4V
*1 Unless otherwise stated, V
IN
= 3.6V
*2 PFM pulse width rate applies only to XC9212 series.
*3 EFFI = [ (Output Voltage x Output Current) / (Input Voltage x Input Current) ] x 100
*4 On resistance = VL
X
(measurement voltage) / 0.4A
*5 The CE/MODE pin of the XC9212 series works also as an external PWM/PFM control switching pin. When the IC is in
operation, control is switched to the PWM mode with synchronous rectification when the CE/MODE pin voltage is equal to
or higher than VIN minus 0.2 V, and to the automatic PWM/PFM switching mode with non synchronous rectification when
the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and equal to or higher than VCEH.
4
XC9211/ 9212 Series
Preliminary
Electrical Characteristics
XC9211A286, XC9212A286
Parameter
Output Voltage
Max. Input Voltage
Min. Operating Voltage
U.V.L.O Voltage
Max. Output Current
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
Max. Duty Cycle
Min. Duty Cycle
PFM pulse width rate * 2
Efficiency *3
LX SW "H" On Resistance *4
LX SW "L" On Resistance *4
Current Limit
CE "H" Voltage
PWM "H" Voltage *5
PWM "L" Voltage *5
CE "L" Voltage
CE "H" Current
CE "L" Current
Soft start time
Symbol
V
OUT1
V
IN
max
V
IN
min
V
UVLO
Driver Transistor Built-In Step-Down DC/DC Converters
Synchronous PWM, Non Synchronous PWM/PFM Switchable
November 18, 2002 Ver. 2
V
OUT
=2.8V, FOSC=600kHz, Ta=25
O
C
Test Conditions
When connected to ext. compoments
Min.
2.744
5.5
Typ.
2.800
Max.
2.856
Units
V
V
I
OUT
=30mA
1.8
Voltage which LX pin voltage holding "L" level
V
V
mA
µA
µA
1.4
400
160
30
0.5
510
100
0
25
90
0.6
0.6
600
1.2
V
IN
- 0.2
V
IN
- 1.0
V
SS
- 0.1
- 0.1
6.0
0.3
0.1
0.1
600
690
I
OUT
max
When connected to ext. compoments
I
DD1
I
DD2
I
STB
FOSC
MAXDTY
MINDTY
No ext. components,
CE=V
IN
, V
OUT
=fixed voltage x 0.9
No ext. components,
CE=V
IN
, V
OUT
=fixed voltage x 1.1
No ext. components, CE=V
OUT
=0V
When connected to ext. compoments
µA
kHz
%
%
%
%
Ω
Ω
mA
V
V
V
V
µA
µA
ms
I
OUT
=30mA
V
OUT
=V
SS
V
OUT
=V
IN
PFMDTY
When connected to ext. components / No load
I
OUT
=100mA
EFFI
R
LXH
R
LXL
I
LIM
V
CEH
V
PWMH
V
PWML
V
CEL
I
CEH
I
CEL
T
SS
CE=V
IN
, I
LX
=400mA, V
OUT
=fixed vol. x 0.9
CE=V
IN
, I
LX
=400mA, V
OUT
=fixed vol. x 1.1
V
IN
=5.0V
No Ext. components
When CE/MODE voltage is applied, LX determine "H"
When connected to ext. components
, I
OUT
=1mA
When connected to ext. components
, I
OUT
=1mA
No Ext. components
When CE/MODE voltage is applied, LX determine "L"
CE=V
IN
=5.5V, V
OUT
=0V
CE=0V, V
IN
=5.5V, V
OUT
=0V
When connected to ext. components
CE=0V 2.4V
*1 Unless otherwise stated, V
IN
= 3.6V
*2 PFM pulse width rate applies only to XC9212 series.
*3 EFFI = [ (Output Voltage x Output Current) / (Input Voltage x Input Current) ] x 100
*4 On resistance = VL
X
(measurement voltage) / 0.4A
*5 The CE/MODE pin of the XC9212 series works also as an external PWM/PFM control switching pin. When the IC is in
operation, control is switched to the PWM mode with synchronous rectification when the CE/MODE pin voltage is equal to
or higher than VIN minus 0.2 V, and to the automatic PWM/PFM switching mode with non synchronous rectification when
the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and equal to or higher than VCEH.
5
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