SP7686AER-L Exar Corporation, SP7686AER-L Datasheet - Page 11

• Manufacturer Part Number: SP7686AER-L
• Description: LED Drivers Driver in 2x3 DFN
• Manufacturer: Exar Corporation
• Series: -r

Specifications of SP7686AER-L

• High Level Output Current: 500 mA
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Supply Current: 3 mA
• Maximum Power Dissipation: Internally Limited
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: DFN-8
• Minimum Operating Temperature: - 40 C
• Constant Current: Yes
• Constant Voltage: -
• Topology: PWM, Step-Down (Buck), Step-Up (Boost), Switched Capacitor (Charge Pump)
• Number Of Outputs: 1
• Internal Driver: -
• Type - Primary: Flash/Torch, General Purpose
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 2MHz ~ 2.8MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Voltage - Output: -
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

O
The SP7686 has over voltage protection. If the
output voltage rises above the 5.5V threshold,
the over voltage protection shuts off all of the
output switches to prevent the output voltage
from
decreases below 5.5V, the device resumes
normal operation.
O
The overcurrent protection circuitry monitors
the average current out of the VOUT pin. If
the
approximately 1.5Amp, then the overcurrent
protection
switches to protect the chip.
© 2010 Exar Corporation
VERVOLTAGE
VERCURRENT
average
rising
circuitry
P
further.
P
ROTECTION
ROTECTION
output
shuts
When
current
off
C
C
Fig. 2: SP7686A with 4 LEDs in parallel
o
the
o
Fig. 1: SP7686 with 4 LEDs in parallel
the
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n
s
s
exceeds
t
t
a
a
output
output
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n
t
t
C
C
11/16
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u
r
r
r
r
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e
APPLICATIONS INFORMATION
The SP7686 can be used with multiple LEDs in
parallel
performance, the LEDs should be in a single
package, preferably from a single die to have
better matching for forward voltage VF for a
given forward current IF. In practice, if the VF
of one LED is higher than the others, it will
consume a larger IF, which will raise its
temperature which will then cause its VF to
reduce, correcting the imbalance. The overall
current will be the sum of the individual
currents, for example ITOTAL = 4*I
Figure
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F
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D
6
6
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F
below.
8
8
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N
6
6
2
2
/
/
m
m
S
S
m
m
P
P
LED
For
7
7
Rev. 2.1.0
x
x
.
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6
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m
m
best
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m
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A
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