Tiny Package, High Efficiency, Step-up DC/DC Converter RT9266 com

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Tiny Package, High Efficiency, Step-up DC/DC Converter RT9266 com

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RT9266
Tiny Package, High Efficiency, Step-up DC/DC Converter
RT9266 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 RT9266 suitable battery cells applications providing 300mA output current. 450kHz high switching rate minimized size external components. Besides, 17µA quiescent current together with high efficiency maintains long battery lifetime. output voltage with external resistors. Both internal switch driver driving external power devices (NMOS NPN) provided.
Features
1.0V Start-up Input Voltage High Supply Capability Deliver 3.3V 100mA with Alkaline Cell 17µA Quiescent (Switch-off) Supply Current Zero Shutdown Mode Supply Current Efficiency 450kHz Fixed Switching Frequency Providing Flexibility Using Internal External Power Switches Small SOT-23-6 SOT-89-5 Package RoHS Compliant 100% Lead (Pb)-Free
Applications
Ordering Information
RT9266 Package Type SOT-23-6 SOT-89-5 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard)
Panel RF-Tags Portable Instrument Wireless Equipment
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
SOT-89-5
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.
DS9266-12 2007
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RT9266
Typical Application Circuit
100uF
1N5819 VOUT 3.3V/5V 1.6M/3M 100uF
RT9266 980k/1M
Figure RT9266 Typical Application Portable Instruments
3.1V 2.8V 100uF RVDD RT9266
4.7uH
1N5819
CVDD 0.1uF 860k/620k 0.22 100k 12V/9V 300mA
100uF
Figure RT9266 High Voltage Applications
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DS9266-12 2007
RT9266
100uF
1N5819
VOUT 3.3V/5V
1.6M/3M 100uF
RT9266
980k/1M
Figure RT9266 Higher Current Applications
3.3V/5V RT9266 100k 10uF 0.1uF 620k 10uF 4.7uH 10uF
VOUT2 +18V 10mA VOUT1 10mA
VOUT3 10mA
Figure RT9266 Multi-Output Applications
DS9266-12 2007
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RT9266
Test Circuit
(VIN) 100uF 10uH 1N5819 VOUT 3.3V/5V 1.6M/3M 980k/1M 100uF
(VDD)
RT9266
Functional Description
RT9266CX5 RT9266CE Chip Enable (Active High) Output Driving External NMOS Ground Switching Input Positive Power RT9266 Feedback Input Internal Reference Voltage Error Amplifier 1.25V. Name Function
Function Block Diagram
RT9266 1.25V Shut Down
Over Temp. Detector
Loop Control Circuit
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DS9266-12 2007
RT9266
Absolute Maximum Ratings
Supply Voltage -0.3V Switch Voltage -0.3V Other Voltages -0.3V (VDD 0.3V) Switch Current 2.5A Driver Current 200mA Package Thermal Resistance SOT-23-6, 145°C/W SOT-89-5, 45°C/W Operating Junction Temperature 125°C Storage Temperature Range -65°C +150°C
NOTE: Absolute Maximum ratings threshold limit values that must exceeded even instant under conditions. Moreover, such values items must reached simultaneously. Operation above these absolute maximum ratings cause degradation permanent damage device. These stress ratings only necessarily imply functional operation below these limits
Electrical Characteristics
(VIN 1.5V, 3.3V, Load Current unless otherwise specified)
Parameter Start-UP Voltage Operating Range Shutdown Current Switch-off Current (VDD) Continuous Switching Current Load Current Feedback Reference Voltage Switching Frequency Maximum Duty Resistance Current Limit Setting Resistance Resistance Line Regulation Load Regulation Trip Level Temperature Stability Vout Thermal Shutdown Hysterises
Symbol IOFF
Test Conditions
-0.4 -1.225 -1.6 -0.4
0.98 -0.01 0.55
1.05 -1.275 -1.1
Units mV/V mV/mA ppm/°C
voltage 4.5V
ISWITCH ISWITCH LOAD VREF DMAX 3.3V, 1.5V, VOUT 3.3V Close Loop, 3.3V 3.3V 3.3V 3.3V ILIMIT 3.3V 3.3V 3.3V VLINE VLOAD 2.5V, 100mA 3.3V
1.25 0.25
-1.2
DS9266-12 2007
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RT9266
Note Load Current highly dependent practical system design component selection that cannot covered production testing. Typical Load Current verified typical application circuit with recommended components. Load Current performance guaranteed Switch Current Continuous Switching Current. Current Limit guaranteed design 25°C. ***Load Regulation tested production practical instrument limitation. Load Regulation performance dominantly dependent loop gain Resistance that guaranteed Line Regulation" Resistance" tests production.
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DS9266-12 2007
RT9266
Typical Operating Characteristics
(Refer Test Circuit)
Efficiency Output Current
Efficiency Output Current
VOUT 3.3V, 25°C
VOUT 25°C
Efficiency
Efficiency
4.0V 3.5V 3.0V
2.5V 2.0V
2.0V
1.5V 1.0V
1.5V
1000
1000
Output Current (mA)
Output Current (mA)
Input Current I(VDD) Output Current
Input Current I(VDD Input Voltage
VOUT load
VOUT
Input Current
Input Current
0.01 1000
Output Current (mA)
Input Voltage
Supply Current I(VIN) Input Voltage
VOUT load
Supply Current I(VIN) Input Voltage
VOUT 3.3V load
Supply Current
Supply Current
Input Voltage
DS9266-12 2007
Input Voltage
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RT9266
Switching Swichting Frequency Voltage
Start Voltage Output Current
VOUT 3.3V
Switching Rate Frequency (KHz). Switching Frequency (kHz)
2.4V 2.8V 5.6V
Start Voltage
1.2V 2.2V
C.R. mode)
Voltage
Output Current (mA)
Output Ripple
VOUT 3.3V 100mA
Output Ripple
VOUT 3.3V 10mA
Output Ripple
Time (1µs/Div)
Output Ripple
Time (1µs/Div)
Output Ripple
VOUT 3.3V 200mA
Output Ripple
VOUT 3.3V 10mA
Output Ripple
Time (1µs/Div)
Output Ripple
Time (1µs/Div)
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DS9266-12 2007
RT9266
Output Ripple
VOUT 3.3V 200mA
Output Ripple
VOUT 3.3V 10mA
Output Ripple
Output Ripple
Time (1µs/Div)
Time (1µs/Div)
Output Ripple
VOUT 200mA
Output Ripple
VOUT 20mA
Output Ripple
Time (1µs/Div)
Output Ripple
Time (1µs/Div)
Output Ripple
VOUT 200mA
Output Ripple
VOUT 20mA
Output Ripple
Time (1µs/Div)
Output Ripple
Time (1µs/Div)
DS9266-12 2007
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RT9266
Output Ripple
4.5V, VOUT
Output Ripple
4.5V, VOUT 20mA
Output Ripple
Time (1µs/Div)
Output Ripple
Time (1µs/Div)
Transient Response
VOUT 3.3V IOUT 10mA 200mA
Transient Response
VOUT 3.3V
Output Transient Voltage
Output Transient Voltage
IOUT 10mA
200mA
Time (50µs/Div)
Time (50µs/Div)
Transient Response
VOUT IOUT 10mA 200mA
Transient Response
4.5V, VOUT
Output Transient Voltage
Time (50µs/Div)
Output Transient Voltage
IOUT 10mA
200mA
Time (50µs/Div)
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DS9266-12 2007
RT9266
Output Voltage Temperature
3.34
Output Voltage Temperature
VOUT IOUT
4.98
1.8V, VOUT 3.3V, IOUT
3.32
Output Voltage(V)
3.28 3.26 3.24 3.22
Output Voltage(V)
4.96 4.94 4.92 4.88 4.86 4.84
Temperature (°C)
Temperature (°C)
DS9266-12 2007
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RT9266
Application Information
Output Voltage Setting Referring Typical Application Circuits, output voltage switching regulator (VOUT with Equation (1).
VOUT 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.
Feedback Loop Design Referring Typical Application Circuits. selection based trade-off between quiescent current consumption interference immunity stated below:
Board Layout Example (2-Layer Board) (Refer Typical Application Circuits Figure board)
Follow Equation 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.
VOUT
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~0.1µF feedback resistors tens hundreds
Layer
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. Bottom Layer www.richtek.com DS9266-12 2007
RT9266
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
DS9266-12 2007
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RT9266
Symbol
Dimensions Millimeters 1.397 0.356 2.388 0.406 3.937 0.787 4.394 1.397 1.397 0.356 1.600 0.508 2.591 0.533 4.242 1.194 4.597 1.702 1.600 0.432
Dimensions Inches 0.055 0.014 0.094 0.016 0.155 0.031 0.173 0.055 0.055 0.014 0.063 0.020 0.102 0.021 0.167 0.047 0.181 0.067 0.063 0.017
5-Lead SOT-89 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
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DS9266-12 2007

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