Tiny Package, High Efficiency, Step-Up DC/DC Converter RT9266B co

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Tiny Package, High Efficiency, Step-Up DC/DC Converter RT9266B co

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RT9266B
Tiny Package, High Efficiency, Step-Up DC/DC Converter
RT9266B compact, high efficiency, voltage step-up DC/DC converter with Adaptive Current Mode control loop, includes error amplifier, ramp generator, comparator, switch pass element driver which providing stable high efficient operation over wide range load currents. operates stable waveforms without external compensation. start-up input voltage below makes RT9266B suitable battery cells applications with 500mA internal switch. 550kHz high switching rate minimized size external components. Besides, quiescent current together with high efficiency maintains long battery lifetime.
Features
1.0V Start-up Input Voltage Load Quiescent (Switch-off) Supply Current Zero Shutdown Mode Supply Current Efficiency 550kHz Switching Frequency 3.3V Providing Flexibility Using Internal External Power Switches Small SOT-23-6 Package RoHS Compliant 100% Lead (Pb)-Free
Applications
Panel RF-Tags Portable Instrument Wireless Equipment
Ordering Information
RT9266B Package Type SOT-23-6 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard)
Configurations
(TOP VIEW)
Note RichTek Pb-free Green products RoHS compliant compatible with current requirements IPC/JEDEC J-STD-020. Suitable SnPb Pb-free soldering processes. 100% matte (Sn) plating.
SOT-23-6
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
Note There pin1 indicator mark SOT-23-6 type, will lower left when reading mark from left right.
DS9266B-09 March 2007
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RT9266B
Typical Application Circuit
10uF SS0520 VOUT 3.3V/5V 1.6M/3M 10uF
RT9266B 980k/1M
Figure RT9266B Typical Application Portable Instruments
10uF
SS0520
VOUT 3.3V/5V
1.6M/3M 10uF 980k/1M
RT9266B
Figure RT9266B Higher Current Applications
Test Circuit
(VIN) 10uF 10uH
SS0520 VOUT 3.3V/5V 1.6M/3M 100p 10uF
(VDD)
RT9266B
980k/1M
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DS9266B-09 March 2007
RT9266B
Functional Description
Name Function Chip Enable (Active High) Output Driving External NMOS Ground Switching Input Positive Power RT9266B Feedback Input Internal Reference Voltage Error Amplifier 1.25V.
Function Block Diagram
RT9266B 1.25V Shut Down
Over Temp. Detector
Loop Control Circuit
DS9266B-09 March 2007
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RT9266B
Absolute Maximum Ratings
Supply Voltage -0.3V Switch Voltage -0.3V 6.5V Other Voltages -0.3V (VDD 0.3V) Switch Current 2.5A Driver Current 200mA Package Thermal Resistance SOT-23-6, 145°C/W Operating Junction Temperature 125°C Storage Temperature Range -65°C +150°C
Electrical Characteristics
(VIN 1.5V, 3.3V, Load Current 25°C, unless otherwise specified)
Parameter Start-UP Voltage Operating Range Load Current (VIN) Switch-off Current (VDD) Shutdown Current (VIN) Feedback Reference Voltage Switching Frequency Maximum Duty Resistance Current Limit Setting Current Limit Delay Time Resistance Resistance Line Regulation (refer VFB) Load Regulation (refer VFB) Trip Level Temperature Stability Vout Thermal Shutdown Thermal Shutdown Hysterises
Symbol LOAD ISWITCH IOFF VREF DMAX
Test Conditions voltage 1.5V, VOUT 3.3V 4.5V Close Loop, 3.3V 3.3V 3.3V 3.3V
-1.225 -0.4
0.98 -150 0.01 1.25 0.35 0.25
1.05 1.275 -1.2
Units mV/V mV/mA ppm/°C
ILIMIT
3.3V 3.3V 3.3V 3.3V
VLINE VLOAD
2.5V, 50mA 2.5V, 100mA 3.3V
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DS9266B-09 March 2007
RT9266B
Typical Operating Characteristics
Efficiency Output Current
Efficiency Output Current
4.5V 3.5V 2.5V 1.5V
Efficiency
Efficiency
2.5V 1.5V
VOUT 3.3V, 25°C
1000
VOUT 25°C
1000
Output Current (mA)
Output Current
Output Voltage Output Current
3.36
Output Voltage Output Current
5.05
4.5V
Output Voltage
Output Voltage
3.32
3.5V
3.28
2.5V
4.95
1.5V
3.24
1.5V VOUT 3.3V, 25°C
2.5V
VOUT 25°C
4.85
1000
1000
Output Current (mA)
Output Current (mA)
Input Current Input Voltage
Input Current Input Voltage
Input Current (uA)
Input Current (uA)
VOUT 3.3V load
VOUT load
Input Voltage
DS9266B-09 March 2007
Input Voltage
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RT9266B
Output Ripple Output Ripple
Output Ripple (mV)
VOUT 3.3V 10mA
Output Ripple (mV)
VOUT 3.3V 50mA
Time (1us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
1.5V, VOUT 3.3V 10mA
Output Ripple (mV)
1.5V, VOUT 3.3V 100mA
Time (1us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
Output Ripple (mV)
VOUT 3.3V 10mA
VOUT 3.3V 100mA
Time (1us/Div)
Time (1us/Div)
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DS9266B-09 March 2007
RT9266B
Output Ripple Output Ripple
Output Ripple (mV)
2.5V, VOUT 3.3V 10mA
Output Ripple (mV)
2.5V, VOUT 3.3V 100mA
Time (1us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
VOUT 3.3V 10mA
Output Ripple (mV)
VOUT 3.3V 100mA
Time (1us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
Output Ripple (mV)
1.5V, VOUT 10mA
1.5V, VOUT 80mA
Time (1us/Div)
Time (1us/Div)
DS9266B-09 March 2007
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RT9266B
Output Ripple Output Ripple
Output Ripple (mV)
VOUT 10mA
Output Ripple (mV)
VOUT 100mA
Time (1us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
2.5V, VOUT 10mA
Output Ripple (mV)
2.5V, VOUT 100mA
Time (1us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
VOUT 10mA
Output Ripple (mV)
VOUT 100mA
Time (1us/Div)
Time (1us/Div)
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DS9266B-09 March 2007
RT9266B
Output Ripple Output Ripple
Output Ripple (mV)
3.5V, VOUT 10mA
Output Ripple (mV)
3.5V, VOUT 100mA
Time (1us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
Output Ripple (mV)
VOUT 10mA
VOUT 100mA
Time (2.5us/Div)
Time (1us/Div)
Output Ripple
Output Ripple
Output Ripple (mV)
Output Ripple (mV)
4.5V, VOUT 10mA
4.5V, VOUT 100mA
Time (5us/Div)
Time (1us/Div)
DS9266B-09 March 2007
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RT9266B
Load Transient Respones
Output Voltage (mV) Output Voltage (mV)
Load Transient Respones
Output Current (mA)
VOUT 3.3V, IOUT 10mA 50mA
Output Current (mA)
1.5V, VOUT 3.3V, IOUT 10mA 100mA
Time (2.5ms/Div)
Time (2.5ms/Div)
Load Transient Respones
Output Voltage (mV) Output Voltage (mV)
Load Transient Respones
Output Current (mA)
VOUT 3.3V, IOUT 10mA 100mA
Output Current (mA)
VOUT IOUT 10mA 100mA
Time (2.5ms/Div)
Time (2.5ms/Div)
Load Transient Respones
Output Voltage (mV) Output Voltage (mV)
Load Transient Respones
Output Current (mA)
3.5V, VOUT IOUT 10mA 100mA
Output Current (mA)
4.2V, VOUT IOUT 10mA 100mA
Time (2.5ms/Div)
Time (2.5ms/Div)
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DS9266B-09 March 2007
RT9266B
Switching Frequency Voltage
Switching Frequency (kHz)
25°C
Voltage
DS9266B-09 March 2007
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RT9266B
Application Information
Output Voltage Setting Referring application circuits, output voltage switching regulator (VOUT) with Equation (1).
VOUT1 1.25V
Layout Guide full plane without break. noise bypass Short wide connection MLCC capacitor between Pin5 Pin3. noise bypass capacitor close inductor, when idea voltage source. Minimized node copper area keep away from noise sources. Minimized parasitic capacitance connecting nodes, which cause additional switching loss. Board Layout Example (2-Layer Board) (Refer Application Circuit Figure board)
Feedback Loop Design Referring application circuits, selection based trade-off between quiescent current consumption interference immunity stated below: Follow Equation (1). Higher reduces quiescent current (Path current 1.25V/R2), however resistors beyond recommended. Lower gives better noise immunity, less sensitive interference, layout parasitics, node leakage, improper probing pins.
VOUT1
Prober Parasitics
proper value feed forward capacitor parallel with improve noise immunity feedback loops, especially improper layout. empirical suggestion around 0~33pF feedback resistors 10nF~0.1F feedback resistors tens hundreds applications without standby suspend modes, lower values preferred. applications concerning current consumption standby suspend modes, higher values needed. Such high impedance feedback loops" sensitive interference, which require careful layout avoid interference, e.g. probing pin.
Layer
Bottom Layer
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DS9266B-09 March 2007
RT9266B
Outline Dimension
Symbol
Dimensions Millimeters 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610
Dimensions Inches 0.031 0.000 0.055 0.010 0.102 0.106 0.033 0.003 0.012 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-6 Surface Mount Package
Richtek Technology Corporation
Headquarter Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
DS9266B-09 March 2007
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Tiny Package, High Efficiency, Step-Up DC/DC Converter RT9266B co

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