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XC9128B45CAR 参数 Datasheet PDF下载

XC9128B45CAR图片预览
型号: XC9128B45CAR
PDF下载: 下载PDF文件 查看货源
内容描述: 1A驱动三极管内置的升压型DC / DC转换器 [1A Driver Transistor Built-In, Step-Up DC/DC Converters]
分类和应用: 转换器驱动
文件页数/大小: 13 页 / 339 K
品牌: TOREX [ TOREX SEMICONDUCTOR ]
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XC9128/XC9129
Series
1A Driver Transistor Built-In, Step-Up DC/DC Converters
ETR0411-006
■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
cameras, Video equipment
●Computer
Mice
●Various
multi-function power supplies using alkali cells (1
to 3 cells), nickel hydride batteries, or single lithium cells
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)
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
APPLICATION CIRCUIT
C
IN
1
V
IN
L
EN
FO
2
3
4
5
PGND
Lx
BAT
EN
FO
V
OUT
10
MODE
9
8
7
6
R
FB2
C
FB
R
FB1
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current
XC9128B45CDx
V
OUT
=5.0V, f
OSC
=1.2MHz
L=4.7
μ
H (CDRH4D28C), C
IN
=10
μ
F, C
L
=32
μ
F
VOUT
MODE
FB
AGND
AEN/
C
L
(ceramic)
100
80
Efficiency : EFFI (%) 
60
3.7V
40
20
0
0.1
VIN=1.8V
PWM(MODE:H)
PWM/PFM(MODE:L)
1
10
100
Output Current : IOUT (mA)
Output Current: I
OUT
(mA)
1000
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