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RT9261B31CB Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part # RT9261B31CB
Description  VFM Step-up DC/DC Converter
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9261B31CB Datasheet(HTML) 1 Page - Richtek Technology Corporation

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Preliminary
RT9261B
DS9261B-03 September 2001
www.richtek-ic.com.tw
1
VFM Step-up DC/DC Converter
General Description
The RT9261B Series are VFM Step-up DC/DC
converter ICs with ultra low supply current by CMOS
process and suitable for use with battery-powered
instruments.
The RT9261B 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 with the
RT9261B IC and only three external components.
The CE pin enables the circuit to set the standby
supply current at a maximum of 0.5
µA.
Ordering Information
RT9261B-
Features
Minimal Number of External Components
(Only an Inductor, a Diode, and a Capacitor)
Ultra Low Input Current (6.5
µµµµA at Switch Off)
Capable of Supplying 50mA Output Current
with Internal Switch
±±±±2% Output Voltage Accuracy
Low Ripple and Low Noise
Low Start-up Voltage, 0.8V at 1mA
80% 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 appliances, which require
higher voltage than that of batteries used in the
appliances
Pin Configurations
Part Number
Pin Configurations
RT9261B-
CX
(Plastic SOT-89)
TOP VIEW
1. GND
2. VOUT (TAB)
3. LX
RT9261B-
CB
(Plastic SOT-25)
TOP VIEW
1. CE
2. VOUT
3. NC
4. GND
5. LX
Operating temperature range
C: Commercial standard
Package type
B : SOT-25
X : SOT-89
Output voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V
54
3
2
1
12
3


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