RT9261B-33GX Richtek USA Inc, RT9261B-33GX Datasheet

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RT9261B-33GX

Manufacturer Part Number
RT9261B-33GX
Description
IC CONV DC-DC VFM STEP-UP SOT89
Manufacturer
Richtek USA Inc
Type
Step-Up (Boost), VFMr
Datasheet

Specifications of RT9261B-33GX

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V
Current - Output
120mA
Frequency - Switching
190kHz
Voltage - Input
Up to 7V
Operating Temperature
-20°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
TO-243AA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 EN pin enables the circuit to set the standby supply
current at a maximum of 0.5μA.
Ordering Information
Note :
Richtek Pb-free and Green products are :
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
DS9261B-15 April 2010
RT9261B-
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
ments of IPC/JEDEC J-STD-020.
Package Type
B : SOT-23-5
X : SOT-89
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
Output Voltage
15 : 1.5V
16 : 1.6V
49 : 4.9V
50 : 5.0V
:
cial Standard)
Features
Applications
Pin Configurations
± ± ± ± ± 2% Output Voltage Accuracy
Minimal Number of External Components (Only an
Inductor, a Diode, and a Capacitor)
Ultra Low Input Current (6.5μ μ μ μ μ A at Switch Off)
Capable of Supplying 50mA Output Current with
Internal Switch
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-23-5 Small Packages
RoHS Compliant and 100% Lead (Pb)-Free
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
GND VOUT
1
(TOP VIEW)
EN VOUT NC
LX
5
SOT-23-5
SOT-89
(TAB)
2
2
GND
4
3
LX
3
RT9261B
www.richtek.com
1

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RT9261B-33GX Summary of contents

Page 1

... 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 ...

Page 2

... VOUT GND Function Block Diagram LX GND www.richtek.com 2 D1 1N5819 L1 RT9261B LX VOUT GND 1N5819 L1 RT9261B LX VOUT GND Chip Enable (Active High). Output Voltage. No Internal Connection. Ground. Pin for Switching. V Limiter LX LXSW Buffer OSC 190kHz Error Amplifier Chip Enable EN V OUT C OUT 22µF ...

Page 3

... SOT-89, θ ------------------------------------------------------------------------------------------------------------ 300° C/W JA SOT-23-5, θ ---------------------------------------------------------------------------------------------------------- 250° C/W JA Operating Temperature Range ------------------------------------------------------------------------------------- Storage Temperature Range --------------------------------------------------------------------------------------- Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260°C Notes: (1) Applicable to RT9261B-xxCB Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Hold-on Voltage Input Current 1 ( Input Current 2 ...

Page 4

... RT9261B Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Hold-on Voltage Efficiency Input Current 1 (1) (2) Input Current 2 Input Current 3 (guaranteed by I and Switching Current LX Leakage Current EN “H” Level EN “L” Level EN “H” Input Current EN “ L” Input Current ...

Page 5

... OUT C = 20μF OUT L = 47μH 100 150 200 3. 3.3V OUT C = 170μF OUT L = 47μH 100 150 200 RT9261B Output Voltage vs. Output Current 4.0 3.5 1.5V 3.0 1.0V 2.5 2.0 1.5 1.0 0.5 0 100 Output Current (mA) Output Current vs. Ripple Voltage 90 ...

Page 6

... RT9261B Start-up/Hold-on Voltage vs. Output Current 2.5 2 1.5 V start 1 V hold 0 Output Current (mA) Output Current vs. Ripple Voltage 300 250 200 150 100 50 1.5V 1. Output Current (mA) Output Current vs. Ripple Voltage Output Current (mA) www.richtek.com 3.3V OUT L = 100μ 100 120 2.0V 3.0V 2 ...

Page 7

... SOT-23-5 Surface Mount Package RT9261B H L Dimensions In Inches Min Max 0.035 0.051 0.000 0.006 0.055 0.071 0.014 0.022 0.102 0.118 0.106 0.122 0.033 0.041 ...

Page 8

... RT9261B Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application ...

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