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-26 SOT89-5 Package
Applications
Panel RF-Tags Portable Instrument Wireless Equipment
Configurations
(TOP VIEW)
Ordering Information
RT9266 Package Type SOT-26 SOT-89-5 Operating Temperature Range Commercial Standard
SOT-26
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
SOT-89-5
DS9266-03
November 2003
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RT9266
Typical Application Circuit
100µF 10µH
1N5819 VOUT 3.3V/5V 1.6M/3M
RT9266
980K/1M
Figure RT9266 Typical Application Portable Instruments
3.1V 2.8V 100µF 4.7µH RVDD CVDD 0.22 NMOS 0.1µF 860K/620K 100K 1N5819
RT9266
Figure RT9266 High Voltage Applications
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DS9266-03 November 2003
100µF
12V/9V 300mA 100µF
RT9266
100µF 10µH
1N5819
VOUT 3.3V/5V
RT9266
980K/1M
Figure RT9266 Higher Current Applications
3.3V/5V 10µH 10µF NMOS 0.1µF 620K 100K 10µF
RT9266
Figure RT9266 Multi-Output Applications
DS9266-03
November 2003
NMOS 1.6M/3M 100µF
VOUT2 +18V 10mA VOUT1 100mA
10µF
VOUT3 10mA 10µF
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RT9266
Description
RT9266CX5 RT9266CE Name Function Chip enable RT9266 gets into shutdown mode when low. Output driving external NMOS Ground switching Input positive power RT9266 Feedback input Internal reference voltage error amplifier 1.25V.
Function Block Diagram
RT9266 1.25V Shut Down
Over Temp. Detector
Loop Control Circuit
Test Circuit
(VIN)
100µF 10µH
1N5819 VOUT 3.3V/5V 100µF
1.6M/3M
RT9266
980K/1M
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(VDD)
DS9266-03 November 2003
RT9266
Absolute Maximum Ratings
Supply Voltage Switch Voltage Other Voltages Switch Current Driver Current Package Thermal Resistance SOT-26, SOT-89-5, Operating Junction Temperature Storage Temperature Range 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. 145°C/W 45°C/W 125°C 65°C +150°C 0.3V 0.3V 0.3V (VDD 0.3V) 2.5A 200mA
Electrical Characteristics
(VIN 1.5V, 3.3V, Load Current 25°C, unless otherwise specified) Parameter Start-UP Voltage Operating Range Shutdown Current (VIN) Switch-off Current (VDD) Continuous Switching Current Load Current (VIN) 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 VLINE VLOAD ILIMIT Symbol IOFF ISWITCH LOAD VREF DMAX Test Conditions voltage 4.5V 3.3V, 1.5V, VOUT 3.3V Close Loop, 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 2.5V, 100mA 3.3V -0.4 -1.225 -1.6 -0.4 -Typ 0.98 -0.01 0.55
1.05 -1.275 -1.1
Units mV/V mV/mA ppm/°C
ISWITCH
1.25 0.25
-1.2
DS9266-03
November 2003
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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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DS9266-03 November 2003
RT9266
Typical Operating Characteristics
(Refer Test Circuit)
Efficiency Output Current
VOUT 25°C
Efficiency Output Current
VOUT 3.3V, 25°C
Efficiency
Efficiency
4.5V 4.0V 3.5V 3.0V 2.5V 2.0V
3.0V 2.5V 2.0V
1.5V
1.5V 1.0V
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
Supply Current I(VIN) Input Voltage
VOUT load
VOUT 3.3V load
Supply Current
Supply Current
Input Voltage
Input Voltage
DS9266-03
November 2003
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RT9266
Swichting Frequency Voltage
Start Voltage Output Current
VOUT 3.3V
Switching Frequency (kHz)
2.4V 2.8V
5.6V
Start Voltage
1.2V 2.2V
C.R. mode)
Voltage
Output Current (mA)
Wave Form Output Ripple
Wave Form Wave Form Output Ripple
VOUT 3.3V 100mA
Wave Form Output Ripple
VOUT 3.3V 10mA
Output Ripple
Time (1µs/Div)
Time (1µs/Div)
Wave Form Output Ripple
Wave Form Wave Form Output Ripple
VOUT 3.3V 200mA
Wave Form Output Ripple
VOUT 3.3V 10mA
Output Ripple
Time (1µs/Div)
Time (1µs/Div)
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DS9266-03 November 2003
RT9266
Wave Form Output Ripple
Wave Form
VOUT 3.3V 200mA
Wave Form Output Ripple
Wave Form Output Ripple
VOUT 3.3V 10mA
Output Ripple
Time (1µs/Div)
Time (1µs/Div)
Wave Form Output Ripple
Wave Form
VOUT 200mA
Wave Form Output Ripple
Wave Form Output Ripple
VOUT 20mA
Output Ripple
Time (1µs/Div)
Time (1µs/Div)
Wave Form Output Ripple
Wave Form
VOUT 200mA
Wave Form Output Ripple
Wave Form Output Ripple
VOUT 20mA
Output Ripple
Time (1µs/Div)
Time (1µs/Div)
DS9266-03
November 2003
www.richtek.com
RT9266
Wave Form Output Ripple
Wave Form Wave Form Output Ripple Time (1µs/Div)
4.5V, VOUT 200mA
Wave Form Output Ripple
4.5V, VOUT 20mA
Output Ripple
Time (1µs/Div)
Transient Response
VOUT 3.3V IOUT 10mA 200mA
Transient Response
VOUT 3.3V IOUT 10mA 200mA
Output Transient Voltage
Time (50µs/Div)
Output Transient Voltage
Time (50µs/Div)
Transient Response
VOUT IOUT 10mA 200mA
Transient Response
4.5V, VOUT IOUT 10mA 200mA
Output Transient Voltage
Time (50µs/Div)
Output Transient Voltage
Time (50µs/Div)
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DS9266-03 November 2003
RT9266
Application Information
Output Voltage Setting Referring Typical Application Circuits, output voltage switching regulator (VOUT) with Eq.1. 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 Typical Application Circuits Figure board)
Eq.1
Feedback Loop Design Referring between Typical Application Circuits, current consumption selection based trade-off quiescent interference immunity stated below: Follow Eq.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.
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 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 DS9266-03 November 2003 www.richtek.com
RT9266
Outline Dimension
Symbol
Dimensions Millimeters 0.889 -1.397 0.356 2.591 2.692 0.838 0.102 0.356 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610
Dimensions Inches 0.035 -0.055 0.014 0.102 0.106 0.033 0.004 0.014 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT- Surface Mount Package
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DS9266-03 November 2003
RT9266
Symbol
Dimensions Millimeters 1.400 0.360 2.400 0.406 -0.800 4.400 -1.400 0.380 1.600 0.520 2.600 0.533 4.250 -4.600 1.700 1.600 0.430
Dimensions Inches 0.055 0.014 0.094 0.016 -0.031 0.173 -0.055 0.014 0.063 0.020 0.102 0.021 0.167 -0.181 0.067 0.063 0.017
5-Lead SOT-89 Surface Mount Package
RICHTEK TECHNOLOGY CORP.
Headquarter
Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
DS9266-03 November 2003 www.richtek.com
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