rt9261b ETC-unknow, rt9261b Datasheet
rt9261b
Manufacturer Part Number
rt9261b
Description
Step Dc/dc Converter
Manufacturer
ETC-unknow
Datasheet
1.RT9261B.pdf
(10 pages)
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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 0.5µA.
Ordering Information
RT9261B-
DS9261B-03 September 2001
Operating temperature range
Package type
B : SOT-25
X : SOT-89
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
49 : 4.9V
50 : 5.0V
:
Preliminary
VFM Step-up DC/DC Converter
Features
Applications
Pin Configurations
Part Number
RT9261B-
(Plastic SOT-89)
RT9261B-
(Plastic SOT-25)
Power source for battery-powered equipment
Power source for cameras, camcorders, VCRs,
Power source for appliances, which require
Minimal Number of External Components
(Only an Inductor, a Diode, and a Capacitor)
Ultra Low Input Current (6.5µ µ µ µ A 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
PDAs, pagers, electronic data banks, and hand-
held communication equipment
higher voltage than that of batteries used in the
appliances
CX
CB
5
1
1
Pin Configurations
2
2
3
4
3
www.richtek-ic.com.tw
RT9261B
1. GND
2. VOUT (TAB)
3. LX
1. CE
2. VOUT
3. NC
4. GND
5.
TOP VIEW
TOP VIEW
LX
1
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