XC9128/XC9129Series
ETR0411-005
1A Driver Transistor Built-In, Step-Up DC/DC Converters
■GENERAL DESCRIPTION
The 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.
■FEATURES
High Efficiency, Large Current Step-Up Converter
■APPLICATIONS
●Digital audio equipment
Output Current
: 150mA@VOUT=3.3V, VIN=0.9V
500mA@VOUT=3.3V, VIN=1.8V
: 0.8V~6.0V
: 1.8V~5.3V (Externally set)
Set up freely with a reference voltage
supply of 0.45V (±0.010V) & external
components
●Digital cameras, Video equipment
●Computer Mice
Input Voltage Range
Output Voltage Setting
Range
●Various multi-function power supplies using alkali cells (1
to 3 cells), nickel hydride batteries, or single lithium cells
Oscillation Frequency
: 1.2MHz (Fixed oscillation frequency
accuracy ±15%)
Input Current
: 1.0A
Maximum Current Limit
Control
: 1.2A (MIN.), 2.0A (MAX.)
: PWM, PWM/PFM control
externally selectable
High Speed
Transient Response
Protection Circuits
:100mV @ VOUT=3.3V,
VIN=1.8V, IOUT=10mA→100mA
: Thermal shutdown
: Integral latch method (Over current
limit)
Soft-Start Time
: 5ms (TYP.) internally set
Ceramic Capacitor Compatible
Adaptor Enable Function (XC9128 series)
Packages
: MSOP-10, USP-10B, SOP-8
Flag Output (XC9128 series) : Open-drain output
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current
XC9128B45CDx
■TYPICAL APPLICATION CIRCUIT
CIN
VOUT
PGND
VOUT
MODE
10
9
1
2
3
4
5
VIN
MODE
VOUT=5.0V, fOSC=1.2MHz
CFB
RFB1
Lx
L
EN
FO
CL
(ceramic)
L=4.7μH (CDRH4D28C), CIN=10μF, CL=32μF
BAT
EN
FB
8
100
AGND
7
RFB2
FO
AEN/
6
80
60
3.7V
VIN=1.8V
40
20
0
PWM(MODE:H)
PWM/PFM(MODE:L)
0.1
1
10
100
1000
Output Current : IOUT (mA)
Output Current: IOUT (mA)
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