SP7612AEC6-L Exar Corporation, SP7612AEC6-L Datasheet - Page 7

• Manufacturer Part Number: SP7612AEC6-L
• Description: LED DRIVER LOW DROPOUT, SMD, 7612
• Manufacturer: Exar Corporation

Specifications of SP7612AEC6-L

• Primary Input Voltage: 5.5V
• No. Of Outputs: 2
• Voltage Regulator Case Style: SC-70
• No. Of Pins: 6
• Operating Temperature Range: -40°C To +85°C
• Operating Temperature Max: 85°C
• Operating Temperature: RoHS Compliant

Example 2: Drive high V
existing bus from 4.0V to 5.5V
High V
of 3.2V to 4.0V. In order to drive these LEDs with the
maximum current of 20mA enabling maximum bright-
ness, usually requires a boost circuit for a single cell Li-
ion power supply. The ultra-low voltage drop of the
SP761X series is capable of driving high V
LEDs with its ultra-low dropout feature. The V
be only 300mV higher than the highest V
- T
- V
- V
- V
Where V
Key Advantages
1) No boost circuit needed for the LCD or keyboard
backlight
2) Drivers utilizes existing bus
3) Ultra-low voltage drop provides the full 20mA LED
current at the lowest possible voltage level.
Example 3: Drive white, blue red, amber LEDs string
In a boost circuit, or existing voltage bus, the SP761X
series of LED drivers can be used to drive a whole string
of LEDs and flexible brightness control - analog and/or
PWM.
Date: 10/11/04
V CONTROL
V CONTROL
DROP
F
IN
IN
(at 20mA) < 3.3V to 4.0V (High V
(at 20mA) = V
(at 5mA typical) ~ 3.3V
V
F
IN
< 0.3V
LEDs have a forward voltage drop in the range
V IN
IN
R SET
I SET
= Existing bus = 3.3V to 4.3V
R SET
I SET
CTRL
LED4
DROP
LED3
CTRL
SP7611A
LED4
+V
GND
F
F
white or blue LEDs from
LED2
= 3.6V to 4.3V
®
®
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
LED3
LED1
SP7611A
‘N’number of LEDs Per Branch
GND
F
)
LED2
F
F
®
®
in the circuit.
white or blue
IN
needs to
LED1
7
- V
- V
- V
Where V
- Analog
Set V
I
- PWM
V
2. SP7612
Key Advantages
1) No need for current matching resistors and discrete
transistors for brightness control.
LED Brightness Control
The SP761X LED Drivers feature analog and PWM
controls to give designers flexible brightness control. To
determine the value of R
graph under the Typical Performance Characteristics.
1. SP7611A
V CONTROL
LED
V CONTROL
CONTROL
-Amplitude sets maximum LED current
-Pulse width controls between 0 and maximum
DROP
IN_MIN
IN_MIN
= 200 x (V
CONTROL
V IN
< 0.3V
= N x V
IN
= N x V
= PWM
V IN
= Existing bus, boost Voltage
3V
ENABLE
R SET
I SET
APPLICATION INFORMATION
and R
CONTROL -
F
F
R SET
I SET
+ 5.5V
+ V
SET
ON/OFF
CTRL
DROP
LED4
V
for LED current
CTRL
CNTR
SET
LED4
© Copyright 2004 Sipex Corporation
, use the "I
SP7612/12A
) / R
LED3
GND
SET
LED3
SP7611A
GND
®
®
SET
LED2
LED1
®
®
vs. V
LED1
CRTL
"