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RT9261B-15CX Datasheet

  • RT9261B-15CX

  • VFM STEP UP DC/DC CONVERTER

  • 10頁(yè)

  • ETC

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Preliminary
RT9261B
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.
Features
Minimal Number of External Components
(Only an Inductor, a Diode, and a Capacitor)
Ultra Low Input Current (6.5碌A(chǔ) at Switch Off)
碌
Capable of Supplying 50mA Output Current
with Internal Switch
鹵
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/擄C Low Temperature-Drift
擄
SOT-89 and SOT-25 Small Packages
Applications
The CE pin enables the circuit to set the standby
supply current at a maximum of 0.5碌A(chǔ).
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
Ordering Information
RT9261B-
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
Pin Configurations
Part Number
RT9261B-
CX
1
2
3
Pin Configurations
TOP VIEW
1. GND
2. VOUT (TAB)
3. LX
TOP VIEW
5
4
(Plastic SOT-89)
RT9261B-
CB
(Plastic SOT-25)
1
2
3
CE
VOUT
NC
GND
5.
LX
1.
2.
3.
4.
DS9261B-03 September 2001
www.richtek-ic.com.tw
1

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