SP7121 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'SP7121' PDF : 10 Pages View PDF
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 ..........................................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
OPERATING RATINGS
Input Voltage Range VIN...............................2.7V to 5.5V
Operating Temperature Range ................... -40°C to 85°C
Thermal Resistance θJA .....................................190°C/W
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.
2.7
1
2.4
0
2
10
1.17
200
Typ.
0.04
135
0.2
0.01
3
1.21
205
Max.
5.5
1
200
1
0.3
0.3
VCC
0.8
5
20
15
25
1.26
210
Units
V
µA
mV
%
%/V
mA/V
%/°C
V
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 0.15 to 1.0V
Note 4: EN input voltage should not exceed VCC voltage at any condition
© 2010 Exar Corporation
2/10
Rev. 2.0.0
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