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PDF RT9261 Data sheet ( Hoja de datos )
| Número de pieza | RT9261 | |
| Descripción | VFM Step-up DC/DC Converter | |
| Fabricantes | RICHTEK | |
| Logotipo |  |
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Preliminary
RT9261/A
VFM Step-up DC/DC Converter
General Description
Features
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.
Minimal Number of External Components ( Only an
Inductor, a Diode, and a Capacitor)
Ultra Low Input Current ( 5µA at Switch Off)
± 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
The RT9261A IC provides with a drive pin (EXT) for an Applications
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.
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
Ordering Information
voltage than that of batteries used in the appliances
RT9261/A-
Package Type
B : SOT-25
X : SOT-89
Pin Configurations
(TOP VIEW)
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Output Voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V
Use external switch
Use internal switch
123
123
GND VOUT LX
(TAB)
RT9261- CX
GND VOUT EXT
(TAB)
RT9261A- CX
SOT-89
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.
CE 1 5 LX CE 1 5 EXT
VOUT
2
VOUT
2
NC 3 4 GND NC 3 4 GND
RT9261-
CB RT9261A-
SOT-25
CB
DS9261/A-06 April 2004
www.richtek.com
1
1 page  
Preliminary
RT9261/A
Absolute Maximum Ratings
Output Voltage --------------------------------------------------------------------------------------------------------- 8V
LX Pin Voltage (1) ------------------------------------------------------------------------------------- 8V
EXT Pin Voltage (2) ---------------------------------------------------------------------------------------------------- −0.3 to VOUT +0.3V
CE Pin Voltage (3) ----------------------------------------------------------------------------------------------------- −0.3 to VOUT +0.3V
LX Pin Output Current (1) ------------------------------------------------------------------------------------------- 250mA
EXT Pin Current (2) --------------------------------------------------------------------------------------------------- ± 50mA
Power Dissipation, PD @ TA = 25°C
SOT-89 ------------------------------------------------------------------------------------------------------------------ 0.5W
SOT-25 ------------------------------------------------------------------------------------------------------------------ 0.25W
Package Thermal Resistance
SOT-89, θJC ------------------------------------------------------------------------------------------------------------ 100° C/W
SOT-89, θJA ------------------------------------------------------------------------------------------------------------- 300° C/W
SOT-25, θJA ------------------------------------------------------------------------------------------------------------- 250° C/W
Operating Temperature Range ------------------------------------------------------------------------------------ −20 to +85°C
Storage Temperature Range --------------------------------------------------------------------------------------- 165°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
Notes:
(1) Applicable to RT9261- CX and RT9261- CB
(2) Applicable to RT9261A- CX and RT9261A- CB
(3) Applicable to RT9261- CB and RT9261A- CB
Electrical Characteristics (Refer to Figure 1)
Parameter
Symbol
Test Conditions
Min Typ Max Units
Output Voltage Accuracy
∆VOUT
-2 -- +2 %
Input Voltage
VIN
-- -- 7 V
Start-up Voltage
VST
IOUT = 1mA, VIN: 0 → 2V
-- 0.85 1.0 V
Hold-on Voltage
VHO
IOUT = 1mA, VIN: 2 → 0V 0.7 -- -- V
Input Current 1
VOUT ≤ 3.5V (1)
3.5V < VOUT ≤ 5V (2)
To be measured at VIN at
no load
-- 15 18
µA
-- 18 24
Input Current 2
To be measured at VOUT in
switch off condition
--
5
8 µA
LX Switching Current VOUT ≤ 3.5V (1)
3.5V < VOUT ≤ 5V (2)
ISWITCHING
VLX = 0.4V
60 -- --
mA
80 -- --
LX Leakage Current
ILEAKAGE VLX = 6V
-- -- 0.5 µA
Maximum Oscillator
FMAX
80 120 160 kHz
Oscillator Duty Cycle
DOSC
On ( VLX ” L ” ) side
65 75 85 %
Efficiency
-- 75 -- %
VLX Voltage Limit
LX switch on
0.65 0.8 1.0 V
Notes:
(1)Unless otherwise provided, VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25°C, and External Circuit of Typical Application
(2)Unless otherwise provided, VIN = 3V, VSS = 0V, IOUT = 10mA, TOPT = 25° C, and External Circuit of Typical Application
DS9261/A-06 April 2004
www.richtek.com
5
5 Page 
Outline Dimension
Preliminary
RT9261/A
D
CB
H
L
b
A
e
A1
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min Max
0.889
1.295
0.000
0.152
1.397
1.803
0.356
0.559
2.591
2.997
2.692
3.099
0.838
1.041
0.080
0.254
0.300
0.610
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
0.003
0.010
0.012
0.024
SOT- 25 Surface Mount Package
DS9261/A-06 April 2004
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9261.PDF ] | |
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