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 0.6Ω
P-channel driver transistor and 0.7ΩN-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 1.0μA 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
Output Voltage Range
: ON resistance 0.6Ω
: ON resistance 0.7Ω
: 2.0V~6.0V (A~D series)
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
: 15μA (TYP.) (V
IN
=3.6V, V
OUT
=1.8V)
Control Method
: Fixed PWM (XC9225)
PWM/PFM Automatic (XC9226)
PWM/PFM Manual (XC9227)
High Efficiency
: 92% (TYP.)
(V
IN
=3.0V, V
OUT
=1.8V, I
OUT
=100mA)*
Output Current
: 500mA *(A~D series)
600mA *(E~H series)
Oscillation Frequency
: 600kHz, 1.2MHz (±15%)
Low Output Ripple
: 10mV
Maximum Duty Ratio
: 100%
Soft-Start Circuit Built-In
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
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current
XC9227A18C
L=4.7uH(NR3015),CIN=4.7uF(ceramic),
CL=10uF(ceramic),Topr=25
℃
V IN
L
1
VIN
V SS
Lx
5
VOUT
500mA (600mA)
100
90
Efficiency:EFFI(%)
C IN
(ceramic)
CE/ MODE
2
CL
(ceramic)
80
70
60
50
40
30
20
10
0
0.1
1
10
100
Output Current:IOUT(mA )
1000
V IN=5.0V
V IN=3.6V
V IN=2.7V
3
CE/
MODE VOUT 4
PWM/PFM A utomatic Sw itching Control
PWM Control
1/21
XC9225/XC9226/XC9227
Series
■PIN
CONFIGURATION
Lx
5
VOUT
4
VIN 6
VSS 5
1 Lx
2 VSS
3 VOUT
1
VIN
3
2
VSS
CE/MODE
CE/MODE 4
SOT-25 (TOP VIEW)
USP-6B
(BOTTOM VIEW)
* Please short the V
SS
(No. 2 and 5) pin.
* The dissipation pad for the USP-6B package should be
solder-plated in recommended mount pattern and metal
masking so as to enhance mounting strength and heat
release. If the pad needs to be connected to other pins,
it should be connected to the V
SS
(No. 5) pin.
■PIN
ASSIGNMENT
PIN NUMBER
SOT-25
USP-6B
1
6
2
2, 5
3
4
4
3
5
1
PIN NAME
V
IN
V
SS
CE / MODE
V
OUT
Lx
FUNCTION
Power Input
Ground
Chip Enable Mode Switch
Output Voltage Sense
Switching Output
■FUNCTIONS
CE/MODE
VOLTAGE
LEVEL
H Level
M Level
L Level
*1
*2
*3
OPERATION
XC9225A SERIES
XC9226A SERIES
XC9227A SERIES
Synchronous PWM/PFM
Automatic Switching Control
Synchronous PWM Fixed
Control
Stand-by
Synchronous PWM Fixed
Control
Synchronous PWM/PFM
Automatic Switching Control
Stand-by
Stand-by
*CE/MODE pin voltage level range
*1. H level: V
IN
-0.3V≦H level≦V
IN
*2. M level: 0.65V≦M level≦V
IN
≦V
IN
-1.0V
*3. L level : 0V≦L level≦0.25V
2/21
XC9225/XC9226/XC9227
Series
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9225①②③④⑤⑥
XC9226①②③④⑤⑥
XC9227①②③④⑤⑥
DESIGNATOR
PWM fixed control
PWM / PFM automatic switching control
PWM fixed control PWM / PFM automatic switching, manual switching
SYMBOL
A
B
C
D
E
F
G
H
0~4
DESCRIPTION
CE input logic High Active, CE pin open (Standard)
CE input logic Low Active, CE pin open (Semi-custom)
CE input logic High Active, Pull-down resistor built-in (Semi-custom)
CE input logic Low Active, Pull-up resistor built-in (Semi-custom)
CE input logic High Active, CE pin open (Standard)
CE input logic Low Active, CE pin open (Semi-custom)
CE input logic High Active, Pull-down resistor built-in (Semi-custom)
CE input logic Low Active, Pull-up resistor built-in (Semi-custom)
Integer number of output voltage
e.g. V
OUT
=2.8V→②=2
*3.0V~4.0V output only for E~H series
Decimal number of output voltage
100mV increment: 00=0, 10=1, 20=2, 30=3, 40=4, 50=5, 60=6, 70=7,
80=8, 90=9
e.g. V
OUT
=2.8V→②=2,
③=8
50mV increment: 05=A, 15=B, 25=C, 35=D, 45=E, 55=F, 65=H, 75=K,
85=L, 95=M
e.g. V
OUT
=2.85V→②=2,
③=L
*3.0V~4.0V output only for E~H series
600kHz
1.2MHz
SOT-25 (SOT-23-5)
USP-6B
Embossed tape, standard feed
Embossed tape, reverse feed
①
DESCRIPTION
Transistor built-in,
Output voltage internally
set (V
OUT
product),
Soft-start internally set
Current limit: 700mA
Transistor built-in,
Output voltage internally
set (V
OUT
product),
Soft-start internally set
Current limit: 900mA
Output Voltage
②
③
Output Voltage
0~9,
A~M
④
⑤
⑥
Oscillation Frequency
Package
Device Orientation
6
C
M
D
R
L
*Output voltage range of the E, F, G, H series is 3.0~4.0V only.
3/21
XC9225/XC9226/XC9227
Series
■BLOCK
DIAGRAM
Phase
Compensation
R2
Error A mp.
Current Feedback
Current Limit
PW M
Comparator
Logic
VOUT
R1
VIN
V ref w ith
Sof t Start,
CE
PW M/PFM
Selector
Synch.
Buf f er
Drive
Lx
U.V .L.O. Cmp
VSS
R3 U.V .L.O.
Ramp Wave
Generator
OSC
CE/ MODE
Control Logic
R4
CE/MODE
NOTE: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside,
and XC9225 series chooses only PWM control.
The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside,
and XC9226 series chooses only PWM/PFM automatic switching control.
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
V
IN
Pin Voltage
Lx Pin Voltage
V
OUT
Pin Voltage
CE / MODE Pin Voltage
Lx Pin Current
Power Dissipation
SOT-25
USP-6B
SYMBOL
V
IN
V
Lx
V
OUT
V
CE
I
Lx
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
100
- 40 ~ + 85
- 55 ~ +125
UNITS
V
V
V
V
mA
mW
℃
℃
Operating Temperature Range
Storage Temperature Range
4/21
XC9225/XC9226/XC9227
Series
■ELECTRICAL
CHARACTERISTICS
XC9225A18Cxx, XC9226A18Cxx, XC9227A18Cxx
PARAMETER
SYMBOL
CONDITIONS
MIN.
V
OUT
=1.8V, f
OSC
=1.2MHz, Ta=25℃
TYP.
MAX.
UNIT
CIRCUIT
Output Voltage
Operating Voltage Range
Maximum Output Current
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
DD
Istb
f
OSC
I
PFM
MAXIPFM
MAXDTY
MINDTY
EFFI
R
LxH
R
LxL
I
LeakH
I
LeakL
I
LIM
△V
OUT
V
CEH
V
CEL
V
PWMH
V
PWML
I
CEH
I
CEL
t
SS
tlat
UVLO Voltage
Supply Current
Stand-by Current
Oscillation Frequency
PFM Switch Current
Maximum I
PFM
Limit
Maximum Duty Ratio
Minimum Duty Ratio
Efficiency (*2)
Lx SW “H” ON Resistance
Lx SW “L” ON Resistance
Lx SW “H” Leak Current
Lx SW “L” Leak Current
Current Limit (*11)
Output Voltage
CE “H” Voltage
CE “L” Voltage
PWM “H” Level Voltage
PWM “L” Level Voltage
CE “H” Current
CE “L” Current
Soft-Start Time
Latch Time
Temperature Characteristics V
OUT
・△topr
When connected to external components,
CE=V
IN
, I
OUT
=30mA
-
V
IN
=<T-1>V,
When connected to external components
(A series) (*10)
CE=V
IN
, V
OUT
=0V, Voltage which Lx pin
voltage holding "L" level (*1), (*12)
V
IN
=CE=3.6V, V
OUT
=set voltage×1.1V
V
IN
=3.6V, CE=0V,
V
OUT
=set voltage×1.1V
When connected to external components,
I
OUT
=100mA
When connected to external components,
CE=V
IN
, I
OUT
=0.1mA
V
IN
=V
OUT
+1.0V, CE=V
IN
, I
OUT
=0.1mA
CE=V
IN
, V
OUT
=0V
CE=V
OUT
=V
IN
When connected to external components,
CE=V
IN
=3.0V, I
OUT
=100mA
CE=0.5V
IN
, V
OUT
=0V, I
Lx
=100mA (*3)
CE=0.5V
IN
, I
Lx
=100mA (*4)
V
IN
=V
OUT
=5.0V, CE=0V, Lx=0V (*5)
V
IN
=V
OUT
=5.0V, CE=0V, Lx=5.0V
V
IN
=CE=5.0V, V
OUT
=0V (A series)
I
OUT
=30mA
-40℃≦Topr≦85℃
V
OUT
=0V, When CE voltage is applied Lx
determine "H"(*12)
V
OUT
=0V, When CE voltage is applied Lx
determine "L" (*12)
When connected to external components,
I
OUT
=1mA (*6)
When connected to external components,
I
OUT
=1mA (*6)
V
IN
=CE=5.5V, V
OUT
=0V
V
IN
=5.5V, CE=0V, V
OUT
=0V
When connected to external components,
CE=0V
→
V
IN
, I
OUT
=1mA
When connected to external components,
V
IN
=CE=5.0V,
Short V
OUT
by 1Ω resistance (*7)
1.764
2.0
500
1.00
-
-
1020
120
35
100
-
-
-
-
-
-
600
-
0.65
V
SS
-
V
IN
- 0.3
- 0.1
- 0.1
0.5
1
1.800
-
-
1.40
15
0
1200
160
44
-
-
90
0.6
0.7
0.01
0.01
700
±100
-
-
-
-
-
-
1.0
-
1.836
6.0
-
1.78
35
1.0
1380
200
50
-
0
-
1.2
1.4
1.0
1.0
-
-
V
IN
0.25
V
IN
- 1.0
-
0.1
0.1
3.0
20
V
V
mA
V
μA
μA
kHz
mA
%
%
%
%
Ω
Ω
μA
μA
mA
ppm/
℃
①
①
①
②
③
③
①
①
①
④
④
①
⑤
⑤
⑥
⑥
⑦
①
⑧
⑧
①
①
⑧
⑧
①
⑨
V
V
V
V
μA
μA
ms
ms
Test conditions: Unless otherwise stated, V
IN
=3.6V
External components L: 4.7uH (CDRH4D18C), CIN: 4.7uF (ceramic) CL: 10uF (ceramic)
<T-1> refers to the below values.
Setting voltage 1.5V>V
OUT
>0.9V
→
T-1=2.4V
Setting voltage 1.8V>V
OUT
>1.5V
→
T-1=3.0V
Setting voltage 4.0V>V
OUT
>1.8V
→
T-1=V
OUT
+1.2V
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current )
/
( input voltage×input current) }×100
*3: On resistance (Ω)= Lx pin measurement voltage
/
100mA
*4: R&D value
*5: When temperature is high, a current of approximately 20μA (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 V
IN
minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than V
IN
minus 1.0V and equal to or
greater than V
CEH
.
*7: 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.
*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”=V
IN
~V
IN
-1.2V, “L”=+0.1V~-0.1V
5/21
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