Tiny Package, High Efficiency, Constant Current Driver RT9269 com

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Tiny Package, High Efficiency, Constant Current Driver RT9269 com

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RT9269
Tiny Package, High Efficiency, Constant Current Driver
RT9269 compact, high efficient driver with high flexibility application configurations charge pump mode boost rectifier mode, delivering Tens constant output current driving white LED's. 0.25V reference voltage minimized power loss across current-setting resistor. wide applicable range makes RT9269 suitable battery cell applications well being supplied with 2.5/3.3/5/6V system powers. 500kHz high switching rate minimized size external components. Besides, quiescent current together with high efficiency maintains long battery lifetime. output current with external resistor. chip enable (EN) used tuning brightness controlling ON/OFF duty with external clock. RT9269 provided SOT-23-6 package.
Features
0.25V Reference Voltage Quiescent (Switch-off) Supply Current Zero Shutdown Mode Supply Current Efficiency 500kHz Fixed Switching Rate Tuning brightness with ON/OFF Duty Small SOT-23-6 Package RoHS Compliant 100% Lead (Pb)-Free
Applications
Module Hand Held Panel Compact Back Light Module Small Battery Charger Constant Current Source
Configurations
(TOP VIEW)
Ordering Information
RT9269 Package Type SOT-23-6 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard)
SOT-23-6 Note There pin1 indicator mark SOT-23-6 type, will lower left when reading mark from left right.
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.
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
DS9269-10 March 2007
www.richtek.com
RT9269
Typical Application Circuit
RT9269 Duty Control Brightness 0.25V
Figure RT9269 drives single parallel LED's charge pump configuration
RT9269 Duty Control Brightness 0.25V
Figure RT9269 drives series connected LED's charge pump configuration
10uF
10uH 100uH
RT9269
10uF
Duty Control Brightness
0.25V
Figure RT9269 drives series connected LED's boost rectifier configuration
Note: NICHIA NSCW100 used RT9269 parts.
www.richtek.com DS9269-10 March 2007
RT9269
Functional Description
Name Function Chip Enable (Active High) Output Configuring Charge Pump Driving External NMOS Ground Switching Input Positive Power RT9269 Feedback Input Internal Reference Voltage Error Amplifier 0.25V.
Function Block Diagram
RT9269 1.25V Shut Down
Over Temp. Detector
Loop Control Circuit
DS9269-10 March 2007
www.richtek.com
RT9269
Absolute Maximum Ratings
Supply Voltage -0.3V Switch Voltage -0.3V (VDD +0.8V) Other Voltages -0.3V (VDD +0.3V) Switch Current 2.5A Driver Current 200mA Power Dissipation, 25°C SOT-23-6 0.25W Package Thermal Resistance SOT-23-6, 250°C/W Operating Junction Temperature 125°C Storage Temperature Range -65°C +150°C
Electrical Characteristics
(VIN =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 Rate Maximum Duty Resistance Current Limit Setting Resistance Resistance Trip Level Temperature Stability VREF Thermal Shutdown Thermal Shutdown Hysterises
Symbol LOAD ISWITCH IOFF VREF DMAX
Test Conditions voltage 3.3V, VOUT Close Loop,
0.98 0.25
1.05
Units
-0.4
-1.2
ppm/°C
ILIMIT
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DS9269-10 March 2007
RT9269
Typical Operating Characteristics
Efficiency Input Voltage
Efficiency
6LEDs, 33uH
4LEDs, 47uH
Efficiency
Efficiency(%)
IOUT 20mA
IOUT 20mA
IOUT 15mA
IOUT 15mA
Input Voltage
VIN(V)
Frequency
Efficiency Input Voltage
IOUT 20mA @VIN 3.8V
Frequency(kHz)
Efficiency
IOUT 15mA @VIN
GND, TA=25°C
Refer Application Circuit Figure
Input Voltage
Ambient Temperature
Efficiency Output Current
Efficiency
(mV)
2.7V 4.2V 3.6V
Ambient Temperature (°C)
DS9269-10 March 2007
Output Current (mA)
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RT9269
Power Waveform
3.0V 4LEDs
Power Waveform
2.5V 4LEDs
200mA/Div
200mA/Div
IOUT
20mA/Div Refer Application Circuit Figure
20mA/Div
IOUT
Refer Application Circuit Figure
Time (2.5ms/Div)
Time (2.5ms/Div)
Output Ripple
3.0V 4LEDs
Output Ripple
2.5V 4LEDs
VOUT
20mA/Div
VOUT
20mA/Div
IOUT
IOUT
Refer Application Circuit Figure Refer Application Circuit Figure
Time (500ns/Div) ((500ns/Div)
Time (1us/Div)
Power Waveform
Power Waveform
3.0V,IOUT 20mA
2.5V,IOUT 20mA
IOUT
20mA/Div Refer Application Circuit Figure
IOUT
20mA/Div Refer Application Circuit Figure
Time (250us/Div)
Time (100us/Div)
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DS9269-10 March 2007
RT9269
Power Waveform
3.8V IOUT 20mA
Power Waveform
1.25V 3.8V IOUT 20mA
IOUT
Refer Application Circuit Figure
IOUT
Refer Application Circuit Figure
Time (10ms/Div)
Time (500us/Div)
Shutdown Response
1.25V 3.8V IOUT 20mA
Output Ripple
3.8V, IOUT 20mA
IOUT VOUT IOUT
Refer Application Circuit Figure Refer Application Circuit Figure
Time (500us/Div)
Time (1us/Div)
Power Waveform
3.2V IOUT 40mA
Power Waveform
1.2V, 3.2V IOUT 40mA
IOUT IOUT
Refer Application Circuit Figure
Refer Application Circuit Figure
Time (5ms/Div)
Time (250us/Div)
DS9269-10 March 2007
www.richtek.com
RT9269
Shutdown Response
1.2V 3.2V IOUT 40mA
Output Ripple
3.2V, IOUT 40mA
IOUT
Refer Application Circuit Figure
VOUT
Refer Application Circuit Figure
Time (250us/Div)
Time (1us/Div)
Brightness Control
Brightness Control
Duty External Signal
Duty External Signal
IOUT
3.0V IOUT 20mA
IOUT
2.5V IOUT 20mA
Time (1ms/Div)
Time (1ms/Div)
www.richtek.com
DS9269-10 March 2007
RT9269
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
DS9269-10 March 2007
www.richtek.com

Tiny Package, High Efficiency, Constant Current Driver RT9269 com

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