3-Channel Dropout Driver RT9301 3-Channel current source driver L

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3-Channel Dropout Driver RT9301 3-Channel current source driver L

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RT9301
3-Channel Dropout Driver
RT9301 3-Channel current source driver LED. easy designed applications that need mixing light source multi-color output. RT9301 also provide users with great flexibility device performance. uses external resistor bias current three LEDs, which matched Users adjust output current from 50mA setting ISET resistor. RT9301 features very dropout under voltage lockout protection. available space-saving TSOT23-8 package.
Features
Input Voltage Range 2.8V 5.5V 60/45mV Dropout 20/15mA Individual Current Setting External Resistor Individual On/Off Control Baseband 50mA Bias Current Simple Brightness Control Current Matching 0.1uA Shutdown Current UVLO Protection Tiny TSOT-23-8 Package
Applications
Mobile phone, Smart Phone Multi-color Backlight Camera Flash White Display Modules Keypad Backlight
Ordering Information
RT9301 Package Type TSOT-23-8 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard)
Configurations
(TOP VIEW)
ISET1 ISET2 LED2 LED1
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.
LED3
ISET3
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
TSOT-23-8 Note There pin1 indicator mark TSOT-23-8 type, will lower left when reading mark from left right.
DS9301-02 March 2007
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RT9301
Typical Application Circuit
VBAT
GPIO
VSET1 VSET2 VSET3
RSET1 RSET2 RSET3
LED1 ISET1 ISET2 ISET3
LED2 LED3
RT9301
Figure Application circuit
VBAT
RSET1 GPIO RSET2 RSET3
ISET1 ISET2 ISET3
LED1
LED2
LED3
RT9301
Figure Application circuit backlight
VBAT
RSET1 GPIO RSET2 RSET3
ISET1 ISET2 ISET3
LED1 LED2 LED3 RT9301
Figure Application circuit keypad ILED1 ISET1 VSET 0.9V RSET1
GPIO ILED (mA) RSET Nearest Standard Values RSET 47.5
DS9301-02 March 2007
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RT9301
Function Block Diagram
ISET1
UVLO
VREF ISET2
LED1
VREF ISET3
Current Source
LED2 LED3
VREF
Functional Description
Name LED3 ISET3 ISET2 ISET1 LED1 LED2 Function White cathode connection pin. 50mA Current flows into LED. Floating connection ground used disable this pin. Ground Pin. Power Input Pin. Current setting LED3. Connect use. Current setting LED2. Connect use. Current setting LED1. Connect use. White cathode connection pin. 50mA Current flows into LED. Floating connection ground used disable this pin. White cathode connection pin. 50mA Current flows into LED. Floating connection ground used disable this pin.
DS9301-02 March 2007
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RT9301
Absolute Maximum Ratings
(Note -0.3V -0.3V 0.382W 262°C/W 260°C 150°C -65°C 150°C 200V Supply Input Voltage -Other Voltages -Power Dissipation, 25°C TSOT-23-8 -Package Thermal Resistance (Note TSOT-23-8, -Lead Temperature (Soldering, sec.) -Junction Temperature -Storage Temperature Range -ESD Susceptibility (Note (Human Body Mode) (Machine Mode)
Recommended Operating Conditions
(Note
Junction Temperature Range -Ambient Temperature Range
-40°C 125°C -40°C 85°C
Electrical Characteristics
(VIN 3.6V, 25°C, Unless Otherwise specification)
Parameter Input Supply Voltage UVLO Threshold UVLO Hysteresis Dropout Voltage ISET Reference Voltage Quiescent Current ILED Matching ILED Accuracy Shutdown current VSET Enable Threshold VSET Disable Threshold
Symbol Test Condition VUVLO_L Falling
-2.2
-120 -0.25
Units
VLED
ILED 12mA
-0.8
Open, ISET ILED 16mA
-1.3
ILED
ILED 16mA VSET1~3 0.25V
VSET
VSET connect RSET ISET VSET connect RSET ISET
Note Stresses listed above "Absolute Maximum Ratings" cause permanent damage device. These stress ratings. Functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods remain possibility affect device reliability. Note Devices sensitive. Handling precaution recommended. Note device guaranteed function outside operating conditions. Note measured natural convection 25°C effective single layer thermal conductivity test board JEDEC 51-3 thermal measurement standard.
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DS9301-02 March 2007
RT9301
Typical Operating Characteristics
Current Input Voltage
Current VSET
3.02V, 3.06V, 3.17V
RSET
RSET RSET
LED1
Current (mA)
Current (mA)
LED2
LED3
RSET 160k
RSET 360k
Input Voltage
VSET
Current Temperature
20.4
Dimming Operation
VBAT 5.0V (1V/Div)
ILED 20mA
20.3
Current (mA)
20.2
VSET
20.1 19.9 19.8 19.7
(10mA/Div)
Time (100s/Div)
Temperature (°C)
Enable Shutdown Response
VBAT 5.0V
Line Transient Response
VBAT 3.7V 4.2V, ILED 20mA (1V/Div)
(1V/Div)
VSET
(10mA/Div)
(10mA/Div)
Time (50s/Div) Time (50s/Div)
DS9301-02 March 2007
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RT9301
Applications Information
RT9301 3-Channel current source driver white LEDs. output current controlled from 50mA adjusting setting current from external. easy support multi-color LED. Input UVLO input operating voltage range RT9301 2.8V 5.5V. input capacitor could reduce ripple voltage. recommended ceramic larger capacitance input capacitor. This provides under voltage lockout (UVLO) function prevent from unstable issue when startup. UVLO threshold input falling voltage 2.1V typically with hysteresis 0.1V. Output Current Setting current setting current ISET pin. current three channels (LED1, LED2, LED3) could from ISET (ISET1, ISET2, ISET3) pins individually. typical application circuit shows Figure
VBAT
current each channel controlled from 50mA. easy obtain multi-color output changing current ISET1, ISET2, ISET3 respectively.
RSET
RSET RSET
Current (mA)
RSET 160k
RSET 360k
VSET
Figure Current Setting Figure shows characteristics ILED VSET. RSET selected, current could controlled from VSET. voltage VSET must higher than 1.3V enable LED. current application, recommended higher resistance RSET (for example: RSET 360k). disable current, ISET should connected ground floating. LEDs application, unused ISET should connected GND. addition, don' short VSETx ISETx pin.
VSET1 VSET2 VSET3
RSET1 RSET2 RSET3
LED1 ISET1 ISET2 ISET3
LED2 LED3
RT9301
Figure Typical Application Circuit
VBAT
current controlled from external voltage (VSET) resistor (RSET) between VSET ISET pin. voltage range VSET from 1.3V 5.5V. internal reference voltage ISET 0.9V typically. current times current flowing into ISET pin. Therefore, current calculated following equation. ILED1 ISET1 VSET1 0.9V RSET1
VSET1 VSET2
RSET1 RSET2
LED1 ISET1 ISET2 ISET3
LED2 LED3
RT9301
Figure Application Circuit LEDs example, RSET1 VSET1 1.8V, current LED1 equal 16mA.
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RT9301
GPIO Control Figure shows application circuit backlight with GPIO. three setting resistors connected GPIO. current controlled GPIO directly. RT9301 provides dropout voltage maximum current matching. also allows dimming control frequency 10kHz.
VBAT
Figure shows another application circuit keypad backlight with GPIO. There LEDs operation parallel. battery regulated power source drives LEDs. Each channel supports three LEDs. brightness adjustment with proper setting resistor each channel controlled from GPIO. Thermal Considerations Rt9301 support current 50mA over operation junction temperature range. However, maximum current must derated higher ambient temperature ensure junction temperature does exceed 125°C. With possible conditions, junction temperature must within range specified under recommended operating conditions. power dissipation calculated based current voltage drop across regulator. (VIN -VFLED) ILED where input voltage, VFLED forward voltage LED, ILED current LED, quiescent current this chip. continuous operation, exceed maximum operation junction temperature 125°C. maximum power dissipation depends thermal resistance package, layout, rate surroundings airflow temperature difference between junction ambient. maximum power dissipation calculated following formula: PD(MAX) TJ(MAX) Where J(MAX) maximum operation junction temperature 125°C, ambient temperature junction ambient thermal resistance.
RSET1 GPIO RSET2 RSET3
ISET1 ISET2 ISET3
LED1
LED2
LED3
RT9301
Figure Application Circuit Backlight with GPIO current different value with proper setting resistor. typical application GPIO 1.8V/2.8V current 15mA/20mA, recommended current setting resistors showed below table. Table RSET Value Selection
GPIO
ILED (mA)
RSET Nearest Standard Values RSET 47.5
VBAT
RSET1 GPIO RSET2 RSET3
ISET1 ISET2 ISET3
LED1 LED2 LED3 RT9301
recommended operating conditions specification RT9301, where J(MAX) maximum junction temperature (125°C) maximum ambient temperature. junction ambient thermal resistance layout dependent. TSOT-23-8 packages, thermal resistance 262°C/W standard JEDEC 51-3 single-layer thermal test board. maximum power dissipation 25°C calculated following formula: PD(MAX) (125°C 25°C) 262°C/W 0.382 TSOT23-8 packages
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Figure Application Circuit Keypad Backlight
DS9301-02 March 2007
RT9301
maximum power dissipation depends operating ambient temperature fixed (MAX) thermal resistance RT9301 packages, Figure derating curves allows designer effect rising ambient temperature maximum power allowed.
Layout Consideration best performance, careful layout necessary. Place peripheral components close possible. short connection highly recommended. following guidelines should strictly followed when designing layout RT9301. traces running from chip LEDs should wide short reduce parasitic connection resistance. Input capacitor (CIN) must placed close LEDs connected ground plane. anodes LEDs must connected CIN, battery directly. Current setting resistors RSET should placed close chip possible. should connected strong ground plane heat sinking noise protection.
Maximum Power Dissipation (mW)1
Single Layer
Ambient Temperature (°C)
current setting resistors should placed close possible.
Figure Derating Curves RT9301 Packages
traces running from chip LEDs should wide short reduce parasitic connection resistance.
Input capacitor (CIN) should placed close LEDs connected ground plane. Anodes LEDs must connect CIN, battery directly.
LED3
LED2 LED1 ISET1 ISET2
Battery
ISET3
Ground Plane should connected strong ground plane heat sinking noise protection.
Figure Layout Guide
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DS9301-02 March 2007
RT9301
Outline Dimension
Symbol
Dimensions Millimeters 0.700 0.000 1.397 0.220 2.591 2.692 0.585 0.080 0.300 1.000 0.100 1.803 0.380 3.000 3.099 0.715 0.254 0.610
Dimensions Inches 0.028 0.000 0.055 0.009 0.102 0.106 0.023 0.003 0.012 0.039 0.004 0.071 0.015 0.118 0.122 0.028 0.010 0.024
TSOT-23-8 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
DS9301-02 March 2007
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3-Channel Dropout Driver RT9301 3-Channel current source driver L

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