XC9128/XC9129
Series
1A Driver Transistor Built-In, Step-Up DC/DC Converters
ETR0411-011
☆GreenOperation
Compatible
■GENERAL
DESCRIPTION
T
he XC9128/XC9129 series are synchronous step-up DC/DC converters with a 0.2Ω (TYP.) N-channel driver transistor and a
synchronous 0.2Ω (TYP.) P-channel switching transistor built-in. A highly efficient and stable current can be supplied up to
1.0A by reducing ON resistance of the built-in transistors. With a high switching frequency of 1.2MHz, a small inductor is
selectable making the series ideally suited for applications requiring low profile or space saving solutions. With the MODE
pin, the series provides mode selection of PWM control or PFM/PWM automatic switching control. In the PWM/PFM
automatic switching mode, the series switches from PWM to PFM to reduce switching loss when load current is small.
When load current is large, the series switches automatically to the PWM mode so that high efficiency is achievable over a
wide range of load conditions. The series also provides small output ripple from light to large loads by using the built-in
circuit which enables the smooth transition between PWM and PFM. With a adaptor enable function of the XC9128 series,
when a voltage higher than the input voltage is applied to the output, the input and the output become isolated making it
possible for the IC to work in parallel with the likes of an AC adaptor.
■APPLICATIONS
●Digital
audio equipment
●Digital
still cameras / Camcorders
●Computer
Mouses
●Multi-function
power supplies
■
FEATURES
High Efficiency, Large Current Step-Up Converter
Output Current
: 150mA＠V
OUT
=3.3V, V
IN
=0.9V
500mA＠V
OUT
=3.3V, V
IN
=1.8V
Input Voltage Range
: 0.8V~6.0V
Output Voltage Setting
: 1.8V~5.3V (Externally set)
Range
Set up freely with a reference voltage
supply of 0.45V (±0.010V) & external
components
Oscillation Frequency
: 1.2MHz (Fixed oscillation frequency
accuracy ±15%)
Input Current
: 1.0A
Maximum Current Limit
: 1.2A (MIN.), 2.0A (MAX.)
Control
: PWM, PWM/PFM control
externally selectable
High Speed
:100mV @ V
OUT
=3.3V,
Transient Response
V
IN
=1.8V, I
OUT
=10mA→100mA
Protection Circuits
: Thermal shutdown
Integral latch method (Over current
limit)
: 5ms (TYP.) internally set
Soft-Start Time
Ceramic Capacitor Compatible
Adaptor Enable Function (XC9128 series)
Flag Output (XC9128 series)
: Open-drain output
Operating Ambient Temperature
: - 40℃∼+85℃
Packages
: MSOP-10, USP-10B
Environmentally Friendly
: EU RoHS Compliant, Pb Free
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current
XC9128B45CD
L=4.7μH(LTF5022-LC),C
L
=30μF(LMK212BJ106KG ×3)
V
O UT
=3.3V,V
EN
=6V,V
FO
=OPEN,V
AEN/
=0V
R
FB1
=270kΩ,R
FB2
=43kΩ,C
FB
=12pF,C
IN
=10μF
C
IN
1
V
IN
L
EN
FO
2
3
4
5
PGND
Lx
BAT
EN
FO
VOUT
MODE
FB
AGND
AEN/
V
OUT
10
MODE
9
8
7
6
R
FB2
C
FB
R
FB1
C
L
(ceramic)
100
90
Efficiency: EFFI (%)
80
70
60
50
40
30
20
10
0
0.1
1.8V
3.0V
PWM/PFM (V
MO DE
=0V)
PWM (V
MODE
=V
O UT
)
1
10
100
1000
Output Current: I
OUT
(mA)
1/26
XC9128/XC9129
Series
■PIN
CONFIGURATION
FO 5
EN 4
P
GND
1
Lx 2
BAT 3
EN 4
FO 5
MSOP-10
(TOP VIEW)
NC 5
EN 4
BAT 3
Lx 2
P
GND
1
USP-10B
(BOTTOM VIEW)
XC9129 Series
10 V
OUT
9 MODE
Lx 2
8 FB
7 A
GND
6 AEN/
P
GND
1
USP-10B
(BOTTOM VIEW)
XC9128 Series
6 NC
7 A
GND
8 FB
9 MODE
10 V
OUT
10 V
OUT
BAT 3
6 AEN/
7 A
GND
8 FB
9 MODE
■PIN
ASSIGNMENT
MSOP-10*
1
2
3
4
5
6
7
8
9
10
-
PIN NUMBER
USP-10B*
(XC9128)
1
2
3
4
5
6
7
8
9
10
-
USP-10B*
(XC9129)
1
2
3
4
-
-
7
8
9
10
5, 6
PIN NAME
P
GND
Lx
BAT
EN
FO
AEN/
A
GND
FB
MODE
V
OUT
NC
FUNCTION
Power Ground
Output of Internal Power Switch
Battery Input
Chip Enable
Flag Output
Adaptor Enable
Analog Ground
Output Voltage Monitor
Mode Switch
Output Voltage
No Connection
*For MSOP-10 and USP-10B packages, please short the GND pins (pins 1 and 7).
*The dissipation pad for the USP-10B package should be solder-plated following the 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
Ground pins (pins 1 and 7).
2/26
XC9128/XC9129
Series
1. EN, AEN/ Pin Function
●XC9128
Series
EN PIN
L→H
H
H
H
L
L
■FUNCTION
CHART
AEN/ PIN
L
H→L
H→L
H
L
H
FB PIN VOLTAGE
-
Lower than 0.45×0.8V
Higher than 0.45×0.95V
-
-
-
IC OPERATIONAL STATE
Operation
Operation
Operation
Step-Up Operation
Shut-Down
Disable
Disable
SOFT-START FUNCTION
Available
Available
Not Available
-
-
-
* Do not leave the EN and AEN/ Pins open.
●XC9129
Series
EN PIN
H
L
IC OPERATIONAL STATE
Operation
Disable
* Do not leave the EN Pin open.
2. MODE Pin Function
●XC9128/XC9129
Series
MODE PIN
H
L
FUNCTION
PWM Control
PWM/PFM Automatic Switching Control
3/26
XC9128/XC9129
Series
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9128①②③④⑤⑥-⑦
DESIGNATOR
①
②③
④
(
*1
)
・・・・Adaptor
Chip Enable Pin and Flag Output Pin are added
ITEM
SYMBOL
B
D
45
C
AR
AR-G
DR
DR-G
DESCRIPTION
With integral protection
Without integral protection
Fixed reference voltage 0.45Ｖ
②=4, ③=5
1.2MHz
MSOP-10 (1,000/Reel)
MSOP-10 (1,000/Reel)
USP-10B (3,000/Reel)
USP-10B (3,000/Reel)
Integral Protection
Reference Voltage
Oscillation Frequency
Packages
(Order Unit)
⑤⑥-⑦
(*1)
XC9129①②③④⑤⑥-⑦
DESIGNATOR
①
(
*1
)
・・・・Adaptor
Chip Enable Pin and Flag Output Pin are not added
ITEM
SYMBOL
B
D
DESCRIPTION
With integral protection
(under development)
Without integral protection
Fixed reference voltage 0.45Ｖ
②=4, ③=5
1.2MHz
USP-10B (3,000/Reel)
USP-10B (3,000/Reel)
Integral Protection
②③
④
⑤⑥-⑦
(*1)
(*1)
Reference Voltage
Oscillation Frequency
Package
(Order Unit)
45
C
DR
DR-G
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
4/26
XC9128/XC9129
Series
■BLOCK
DIAGRAM
●XC9128
Series
* XC9129 Series
The XC9129 series does not have AEN/ pin and FO pin.
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
V
OUT
Pin Voltage
AEN/ Pin Voltage
(*2)
FO Pin Voltage
(*2)
FO Pin Current
(*2)
FB Pin Voltage
BAT Pin Voltage
MODE Pin Voltage
EN Pin Voltage
L
X
Pin Voltage
L
X
Pin Current
MSOP-10
Power Dissipation
USP-10B
Operating Ambient Temperature
Storage Temperature
*1: When implemented on a PCB.
*2: The XC9129 series does not have AEN/ pin and FO pin. These pins are available only in the XC9128 series.
SYMBOL
V
OUT
V
AEN/
V
FO
I
FO
V
FB
V
BAT
V
MODE
V
EN
V
Lx
I
Lx
Pd
Topr
Tstg
RATINGS
- 0.3∼6.5
- 0.3∼6.5
- 0.3∼6.5
10
- 0.3∼6.5
- 0.3∼6.5
- 0.3∼6.5
- 0.3∼6.5
- 0.3∼V
OUT
+0.3
2000
350
(*1)
150
- 40∼+85
- 55∼+125
UNITS
V
V
V
mA
V
V
V
V
V
mA
mW
o
o
C
C
AGND, PGND is the standard voltage for all of voltages.
5/26
