S P7121
2-Channel Adjustable Low Dropout High Side Linear
LED Driver
January 2010
Rev. 2.0.0
GENERAL DESCRIPTION
APPLICATIONS
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 .04μA typical.
The SP7121 is available in a small footprint
RoHS compliant, lead-free and green/halogen
free 6-pin SOT23 packages.
• 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 < 1μA
• 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
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
S P7121
2-Channel Adjustable Low Dropout High Side Linear
LED Driver
ABSOLUTE MAXIMUM RATINGS
OPERATING 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.
Input Voltage Range VIN ............................... 2.7V to 5.5V
Operating Temperature Range ................... -40°C to 85°C
Thermal Resistance θJA .....................................190°C/W
VCC, VLED1, VLED2,EN to GND .......................... -0.3V to 6.0V
LED Current ILED1, ILED2 .......................................... 30mA
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
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
Min.
Typ.
Max.
Units
Conditions
5.5
V
Shutdown Current
0.04
1
µA
EN=Low
VLED Dropout Voltage , VD1
135
200
mV
VCC=5.5V, ILED=20mA
0.2
1
%
0.3
%/V
0.3
mA/V
VCC=3.7V, 150mV
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