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RT9261-25CX 参数 Datasheet PDF下载

RT9261-25CX图片预览
型号: RT9261-25CX
PDF下载: 下载PDF文件 查看货源
内容描述: VFM升压型DC / DC转换器 [VFM Step-up DC/DC Converter]
分类和应用: 转换器
文件页数/大小: 14 页 / 219 K
品牌: RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
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Preliminary
RT9261/A
VFM Step-up DC/DC Converter
General Description
The RT9261 Series are VFM Step-up DC/DC ICs
with ultra low supply current by CMOS process and
suitable for use with battery-powered instruments.
The RT9261 IC consists of an oscillator, a VFM
control circuit, a driver transistor (LX switch), a
reference voltage unit, an error amplifier, resistors for
voltage detection, and a LX switch protection circuit.
A low ripple and high efficiency step-up DC/DC
converter can be constructed of this RT9261 IC with
only three external components.
The RT9261A IC provides with a drive pin (EXT) for
an external transistor, so that a power transistor can
be externally applied. Therefore, the RT9261A IC is
recommended for applications where large currents
are required. CE pin enables circuit to set the
standby supply current at a maximum of 0.5µA.
Features
Minimal Number of External Components ( Only
an inductor, a diode, and a capacitor)
Ultra Low Input Current ( 5µA at Switch Off)
µ
±
2% High Output Voltage Accuracy
Low Ripple and Low Noise
Low Start-up Voltage, 0.85V at 1mA
75% Efficiency with Low Cost Inductor
+50 ppm/°C Low Temperature-Drift
°
SOT-89 and SOT-25 Small Packages
Applications
Power source for battery-powered equipment
Power source for cameras, camcorders, VCRs,
PDAs, pagers, electronic data banks, and hand-
held communication equipment
Power source for applications, which require
higher voltage than that of batteries used in the
appliances
Ordering Information
RT9261A-
Package type
B : SOT-25
X : SOT-89
Operating temperature range
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V
A : Use external switch
Use internal switch
Pin Configurations
Part Number
RT9261-
CX
Pin Configurations
TOP VIEW
1. GND
2. VOUT (TAB)
3. LX
TOP VIEW
1. GND
2. VOUT (TAB)
3. EXT
TOP VIEW
5
4
(Plastic SOT-89)
1
2
3
RT9261A-
CX
1
2
3
(Plastic SOT-89)
RT9261-
CB
(Plastic SOT-25)
1
2
3
1.
2.
3.
4.
5.
CE
VOUT
NC
GND
LX
RT9261A-
CB
TOP VIEW
5
4
(Plastic SOT-25)
1
2
3
1.
2.
3.
4.
5.
CE
VOUT
NC
GND
EXT
DS9261/A-03 January 2002
www.richtek-ic.com.tw
1