RT9261A Datasheet PDF - RICHTEK
| Part Number | RT9261A | |
| Description | VFM Step-up DC/DC Converter | |
| Manufacturers | RICHTEK | |
| Logo |  |
|
|
There is a preview and RT9261A download ( pdf file ) link at the bottom of this page. Total 12 Pages | ||
Preview 1 page No Preview Available !
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
|
| |
 
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
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for RT9261A electronic component. |
| Information | Total 12 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ RT9261A.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| RT9261 | The function is VFM Step-up DC/DC Converter. RICHTEK | |
| RT9261A | The function is VFM Step-up DC/DC Converter. RICHTEK | |
| RT9261B | The function is VFM STEP UP DC/DC CONVERTER. ETC |  |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
RT92
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||