RT9261 RICHTEK [Richtek Technology Corporation], RT9261 Datasheet

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RT9261

Manufacturer Part Number
RT9261
Description
VFM Step-up DC/DC Converter
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
RT9261
Manufacturer:
RICHTEK(立锜)
Quantity:
20 000
Part Number:
RT9261-27CX
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RICHTEK/立锜
Quantity:
20 000
Part Number:
RT9261-27PX
Manufacturer:
RICHTEK/立锜
Quantity:
20 000
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Manufacturer:
RICHTEK/立锜
Quantity:
20 000
Part Number:
RT9261-30CB
Manufacturer:
RICHTEK/立锜
Quantity:
20 000
Part Number:
RT9261-30PX
Manufacturer:
RICHTEK
Quantity:
39 000
Part Number:
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Manufacturer:
RICHTEK
Quantity:
51 000
Part Number:
RT9261-40PX
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RICHTEK
Quantity:
15 803
General Description
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.
The RT9261A IC provides with a drive pin (EXT) for
an 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.
Ordering Information
RT9261A-
DS9261/A-03 January 2002
Operating temperature range
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
49 : 4.9V
50 : 5.0V
A : Use external switch
Package type
B : SOT-25
X : SOT-89
:
Use internal switch
Preliminary
VFM Step-up DC/DC Converter
Features
Applications
Pin Configurations
RT9261-
(Plastic SOT-89)
RT9261A-
(Plastic SOT-89)
RT9261-
(Plastic SOT-25)
RT9261A-
(Plastic SOT-25)
Part Number
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 voltage than that of batteries used in the
appliances
Minimal Number of External Components ( Only
an inductor, a diode, and a capacitor)
Ultra Low Input Current ( 5µ µ µ µ A 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
CB
CX
CX
CB
1
5
1
1
5
1
Pin Configurations
2
2
2
2
3
3
4
3
4
3
RT9261/A
www.richtek-ic.com.tw
1. GND
2. VOUT (TAB)
3. LX
1. GND
2. VOUT (TAB)
3. EXT
1. CE
2. VOUT
3. NC
4. GND
5. LX
TOP VIEW
1. CE
2. VOUT
3. NC
4. GND
5. EXT
TOP VIEW
TOP VIEW
TOP VIEW
1

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RT9261 Summary of contents

Page 1

... A low ripple and high efficiency step-up DC/DC converter can be constructed of this RT9261 IC with only three external components. The RT9261A IC provides with a drive pin (EXT) for an 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 0.5µ ...

Page 2

... SOT-89, θ JA SOT-25, θ JA Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Notes: (1) Applicable to RT9261- CX and RT9261- (2) Applicable to RT9261A- (3) Applicable to RT9261- CB and RT9261A- Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Hold-on Voltage V ≤ 3.5V OUT Input Current 1 3.5V < ...

Page 3

... OUT ( 0.4V EXT (2) ≤ 5V OUT F MAX D V ” H ” side OSC EXT = 1.8V, VSS = 0V 10mA OUT = 3V, VSS = 0V 10mA OUT RT9261/A Min - 0. → OUT -- -1.5 – 0.4V OUT -2 1 25°C, and use External Circuit of OPT = 25° ...

Page 4

... RT9261/A Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Hold-on Voltage ≤ 3.5V V OUT Efficiency 3.5V < V OUT ≤ 3.5V V OUT Input Current 1 3.5V < V OUT V ≤ 3.5V OUT Input Current 2 3.5V < V OUT ≤ 3. Switching OUT Current 3.5V < V OUT LX Leakage Current CE “H” Level CE “ ...

Page 5

... V = 0.4V EXT (2) ≤ OUT OUT OUT MAX ” L” ) side OSC LX LX switch on = 1.8V, VSS = 0V 10mA OUT = 3V, VSS = 0V 10mA OUT RT9261/A Min Typ - 0. → OUT -- 6 -1.5 -- – × ...

Page 6

... RT9261/A Function Block Diagram LX GND EXT Notes: (1) LX Pin .…… only for 9261- (2) EXT Pin …… only for 9261A- (3) CE Pin …… only for 9261- Pin Description Pin No. -xxCX A-xxCX -xxCB www.richtek-ic.com.tw ...

Page 7

... V IN DS9261/A-03 January 2002 Preliminary D1 1N5819 L1 RT9261CX LX VOUT GND Fig 0.01µF 1N5819 Cb RT9261ACX EXT VOUT GND Rb Tr 300Ω Fig 1N5819 RT9261CB LX NC EXT VOUT CE GND Fig. 3 RT9261/A V OUT + Co _ 22µF V OUT + Co _ 22µF V OUT + Co _ 22µF www.richtek-ic.com.tw 7 ...

Page 8

... RT9261/A 27µ www.richtek-ic.com.tw 8 Preliminary L1 D1 1N5819 RT9261ACB NC 0.01µ EXT VOUT CE GND ZTX 650 Rb Tr 300Ω Fig 1N5819 RT9261CB LX 27µH NC EXT VOUT CE CE GND IN Fig OUT + Co _ 22µF V OUT + Co _ 22µF DS9261/A-03 January 2002 ...

Page 9

... RT9261 V = 2.7V OUT 2.90 2.5V 2.0V 2.85 2.80 2.75 2.70 2.65 RT9261 V = 2.7V OUT 2. 100 2.0V 2.5V RT9261 V = 2.7V OUT 60 80 100 RT9261/A RT9261(2.7V) Output Current vs. Ripple Voltage 120 100 80 2.0V 60 1. Output Current (mA) Output Voltage vs. Temperature -40 - Temperature ( C) ° Supply Current vs. Temperature Input Current 2 10 ...

Page 10

... RT9261A (2.7V) Output Voltage vs. Output Current 3.0 2.5 2.0 1.5 1.0 0.5 0 Output Current (mA) RT9261A (2.7V) Efficiency vs. Output Current Output Current (mA) RT9261A (2.7V) Output Current vs. Ripple Voltage 120 100 Output Current (mA) DS9261/A-03 January 2002 2.5V 2.0V 1.5V 1.0V 0.9V RT9261A V = 2.7V OUT 120 150 2.5V 2.0V 0.9V 1.5V 1 ...

Page 11

... SOT-89 Surface Mount RT9261 Dimensions In Inches Min Max 0.055 0.063 0.014 0.019 0.094 0.102 0.016 0.021 -- 0.167 0.031 0.047 0.173 0.181 ...

Page 12

... RT9261 Symbol www.richtek-ic.com.tw 12 Preliminary 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 0.102 0.254 0.356 0.610 SOT- 25 Surface Mount Package H L Dimensions In Inches ...

Page 13

... DS9261/A-03 January 2002 Preliminary RT9261/A www.richtek-ic.com.tw 13 ...

Page 14

... RT9261/A RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 www.richtek-ic.com.tw 14 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw ...

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