SP7121EK-F

SP7121EK-F Datasheet

SP7121

Part	Datasheet
SP7121EK-F	SP7121EK-F (pdf)

Related Parts	Information
SP7121EB	SP7121EB
SP7121EK-L	SP7121EK-L
SP7121EK-F/TR	SP7121EK-F/TR
SP7121EK-L/TR	SP7121EK-L/TR

PDF Datasheet Preview
January 2010 SP7121 2-Channel Adjustable Low Dropout High Side Linear LED Driver The SP7121 LED driver provides a simple solution for a matched current source for any color common cathode LEDs. The common cathode connection allows the user to increase the LED power dissipation by having the cathodes heat sinked to the ground plane of the circuit board. The SP7121 output current value is set by an external resistor. At shutdown mode EN pin is LOW , the supply current drops to .04uA typical. The SP7121 is available in a small footprint RoHS compliant, lead-free and green/halogen free 6-pin SOT23 packages. APPLICATIONS • Mobile Phones • PDA, DSC, MP3 Players • Handheld Computers • Keypads and Displays Backlight FEATURES • LED Driver for Common Cathode Parallel Connected LEDs • Ultra Low Dropout Voltage of 300mV 25mA • No EMI, no Switching Noise • Integrated Current Matching • PWM Brightness Control • Enable/Shutdown Control • Shutdown Current < 1uA • Adjustable Output Current up to 30mA per Channel • RoHS Compliant, Lead Free and Halogen Free SOT23-6 Packages TYPICAL APPLICATION DIAGRAM Fig. 1 SP7121 Application Diagram Exar Corporation 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 SP7121 2-Channel Adjustable Low Dropout High Side Linear LED Driver ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC, VLED1, VLED2,EN to GND.......................... -0.3V to 6.0V LED Current ILED1, ILED2 Storage Temperature -65°C to 150°C Junction Temperature 150°C Lead Temperature Soldering, 10 sec 300°C ESD Rating HBM Enable and ISET pins..................1.5kV ESD Rating HBM All other pins .............................2.0kV ESD Rating MM - Machine Model ...........................200V OPERATING RATINGS Input Voltage Range VIN...............................2.7V to 5.5V Operating Temperature Range -40°C to 85°C Thermal Resistance ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of TA = 25°C only limits applying over the full Operating Ambient Temperature range are denoted by a Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided for reference purposes only. Unless otherwise indicated, VCC = 2.7V to 5.5V, ENABLE = VCC, ILED = 15mA. Parameter VCC Shutdown Current VLED Dropout Voltage , VD1 LED to LED Current Matching LED Current Line Regulation2 LED Current Load Regulation3 LED Current Thermal Regulation EN ON Voltage High 4 EN OFF Voltage Low EN Input Bias Current EN Switching Frequency EN ON Minimum Pulse Width LED Current per Channel ISET Voltage ISET Current Multiplication Ratio Min. 10 200 Typ. 135 Max. 1 200 1 VCC 5 20 15 25 210 Units V µA mV % %/V mA/V %/°C V µA kHz µs mA V Conditions EN=Low VCC=5.5V, ILED=20mA VCC=5.5V, VD>200mV 2.7V< VCC<5.5V VCC=3.7V, 150mV<VD<1.0V VD=300mV VEN= VCC=5.5V VEN= VCC=3.7V VEN= VCC=3.7V Note 1 Difference between VCC voltage and LED anode voltage at which ILED current drops 10% from nominal value Note 2 ILED current variations per volt VCC change Note 3 ILED current variations at VD change from to 1.0V Note 4 EN input voltage should not exceed VCC voltage at any condition 2010 Exar Corporation 2/10 BLOCK DIAGRAM ORDERING INFORMATION Temperature Range Marking SP7121EK-L NAWW SP7121EK-L/TR NAWW SP7121EK-F BCWW SP7121EK-F/TR SP7121EB BCWW SP7121 Evaluation Board “WW” = Work Week Package Packing Quantity Note 1 6-pin SOT23 Bulk RoHS compliant Lead Free 6-pin SOT23 2.5K/Tape & Reel RoHS compliant Lead Free 6-pin SOT23 Bulk RoHS compliant Halogen Free 6-pin SOT23 2.5K/Tape & Reel RoHS compliant Halogen Free Note 2 2010 Exar Corporation 4/10 SP7121 2-Channel Adjustable Low Dropout High Side Linear LED Driver TYPICAL PERFORMANCE CHARACTERISTICS PWM Function 2 LEDs PWM Function 1 High Power LED 2010 Exar Corporation 5/10 SP7121 2-Channel Adjustable Low Dropout High Side Linear LED Driver 2010 Exar Corporation 6/10 SP7121 2-Channel Adjustable Low Dropout High Side Linear LED Driver THEORY OF OPERATION

PDF Datasheet Preview

January 2010

SP7121
2-Channel Adjustable Low Dropout High Side Linear LED Driver

The SP7121 LED driver provides a simple solution for a matched current source for any color common cathode LEDs. The common cathode connection allows the user to increase the LED power dissipation by having the cathodes heat sinked to the ground plane of the circuit board. The SP7121 output current value is set by an external resistor. At shutdown mode EN pin is LOW , the supply current drops to .04uA typical.

The SP7121 is available in a small footprint RoHS compliant, lead-free and green/halogen free 6-pin SOT23 packages.

APPLICATIONS
• Mobile Phones
• PDA, DSC, MP3 Players
• Handheld Computers
• Keypads and Displays Backlight

FEATURES
• LED Driver for Common Cathode

Parallel Connected LEDs
• Ultra Low Dropout Voltage
of 300mV 25mA
• No EMI, no Switching Noise
• Integrated Current Matching
• PWM Brightness Control
• Enable/Shutdown Control
• Shutdown Current < 1uA
• Adjustable Output Current up to 30mA
per Channel
• RoHS Compliant, Lead Free and

Halogen Free SOT23-6 Packages

TYPICAL APPLICATION DIAGRAM

Fig. 1 SP7121 Application Diagram

Exar Corporation 48720 Kato Road, Fremont CA 94538, USA

Tel. +1 510 668-7000 Fax. +1 510 668-7001

SP7121
2-Channel Adjustable Low Dropout High Side Linear LED Driver

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

VCC, VLED1, VLED2,EN to GND.......................... -0.3V to 6.0V LED Current ILED1, ILED2 Storage Temperature -65°C to 150°C Junction Temperature 150°C Lead Temperature Soldering, 10 sec 300°C ESD Rating HBM Enable and ISET pins..................1.5kV ESD Rating HBM All other pins .............................2.0kV ESD Rating MM - Machine Model ...........................200V

OPERATING RATINGS

Input Voltage Range VIN...............................2.7V to 5.5V Operating Temperature Range -40°C to 85°C Thermal Resistance

ELECTRICAL SPECIFICATIONS

Specifications with standard type are for an Operating Junction Temperature of TA = 25°C only limits applying over the full Operating Ambient Temperature range are denoted by a Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided for reference purposes only. Unless otherwise indicated, VCC = 2.7V to 5.5V, ENABLE = VCC, ILED = 15mA.

Parameter

VCC Shutdown Current VLED Dropout Voltage , VD1 LED to LED Current Matching LED Current Line Regulation2 LED Current Load Regulation3 LED Current Thermal Regulation EN ON Voltage High 4 EN OFF Voltage Low EN Input Bias Current EN Switching Frequency EN ON Minimum Pulse Width LED Current per Channel ISET Voltage ISET Current Multiplication Ratio

Min.
10 200

Typ. 135

Max. 1 200 1

VCC 5 20 15 25 210

Units

V µA mV % %/V mA/V %/°C V µA kHz µs mA V

Conditions

EN=Low VCC=5.5V, ILED=20mA VCC=5.5V, VD>200mV 2.7V< VCC<5.5V VCC=3.7V, 150mV<VD<1.0V VD=300mV

VEN= VCC=5.5V

VEN= VCC=3.7V VEN= VCC=3.7V

Note 1 Difference between VCC voltage and LED anode voltage at which ILED current drops 10% from nominal value Note 2 ILED current variations per volt VCC change Note 3 ILED current variations at VD change from to 1.0V Note 4 EN input voltage should not exceed VCC voltage at any condition
2010 Exar Corporation
2/10

BLOCK DIAGRAM
ORDERING INFORMATION

Temperature Range

Marking

SP7121EK-L

NAWW

SP7121EK-L/TR

NAWW

SP7121EK-F

BCWW

SP7121EK-F/TR SP7121EB

BCWW

SP7121 Evaluation Board
“WW” = Work Week

Package

Packing Quantity

Note 1
6-pin SOT23

Bulk

RoHS compliant Lead Free
6-pin SOT23 2.5K/Tape & Reel RoHS compliant Lead Free
6-pin SOT23

Bulk

RoHS compliant Halogen Free
6-pin SOT23 2.5K/Tape & Reel RoHS compliant Halogen Free

Note 2
2010 Exar Corporation
4/10

SP7121
2-Channel Adjustable Low Dropout High Side Linear LED Driver

TYPICAL PERFORMANCE CHARACTERISTICS

PWM Function 2 LEDs

PWM Function 1 High Power LED
2010 Exar Corporation
5/10

SP7121
2-Channel Adjustable Low Dropout High Side Linear LED Driver
2010 Exar Corporation
6/10

SP7121
2-Channel Adjustable Low Dropout High Side Linear LED Driver

THEORY OF OPERATION

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived SP7121EK-F Datasheet file may be downloaded here without warranties.

Datasheet ID: SP7121EK-F 512914