sp6887 Exar Corporation, sp6887 Datasheet - Page 4

• Manufacturer Part Number: sp6887
• Description: 4 Channel Regulated Charge Pump Wled Driver
• Manufacturer: Exar Corporation

T
Typical Characteristics
V
Rev. C – 10/31/2007
A
IN
Input Voltage Range
Shutdown Current
Quiescent Current
RSET Regulated Voltage
Programmed LED Current
LED Current Accuracy
LED Channel Matching
Output Resistance
(Open Loop)
Charge Pump Frequency
VIN at Mode Transition
from 1x to 1.5x
1x to 1.5x Mode Transition
Dropout Delay
Input Leakage Current
High Detect Threshold
Low Detect Threshold
=25ºC, V
=3.6V, EN=V
1. Efficiency vs Input Voltage (4 LEDs)
Parameter
IN
=3.5V, C
IN
, R
SET
IN
=C
=24kΩ, C
OUT
=1µF, unless otherwise noted.
Symbol
I
I
I
I
V
I
EN-CTRH
V
LED-ACC
LED-DEV
T
EN-CTRL
IN
EN-CTR
IN-Tran
I
f
V
I
R
DROP
OSC
I
RSET
LED
SD
=1µF, T
IN
Q
O
SP6887 4 Channel WLED Driver
VEN=0V Shutdown Mode
1X Mode, No Load
1.5x Mode, No Load
R
R
R
(I
1x Mode, I
1.5x Mode, I
I
I
On Inputs EN, CTR0, 1 & 2
On Inputs EN, CTR0, 1 & 2
On Inputs EN, CTR0, 1 & 2
A
LED
LED
SET
SET
SET
=25ºC, unless otherwise noted.
LED
=15mA
=20mA
=90kΩ
=29.3kΩ
=14.7kΩ
-I
LEDAVG
Conditions
O
)/I
=100mA
4/10
O
LEDAVG
=100mA
2. Efficiency vs Output Current (4 LEDs)
ELECTRICAL SPECIFICATIONS
1.19
Min
2.7
0.4
1.5
Typ.
1.23
15.0
30.0
3.45
3.60
0.05
0.6
2.5
5.0
1.7
4.3
1.0
0.6
© 2007 Exar Corporation
±5
±3
Max
1.25
5.5
1.2
0.9
0.4
1
5
1
Unit
MHz
mA
mA
mA
ms
µA
µA
%
%
Ω
V
V
V
V
V