SP6887 Datasheet, PDF (4/10 Pages) Exar Corporation – 4 CHANNEL REGULATED CHARGE PUMP WLED DRIVER

ELECTRICAL SPECIFICATIONS
T_A=25ºC, V_IN=3.5V, C_IN=C_OUT=1µF, unless otherwise noted.
Parameter
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
Symbol
V_IN
I_SD
I_Q
V_RSET
I_LED
I_LED-ACC
I_LED-DEV
R_O
f_OSC
V_IN-Tran
T_DROP
I_EN-CTR
I_EN-CTRH
I_EN-CTRL
Conditions
VEN=0V Shutdown Mode
1X Mode, No Load
1.5x Mode, No Load
R_SET=90kΩ
R_SET=29.3kΩ
R_SET=14.7kΩ
(I_LED-I_LEDAVG)/I_LEDAVG
1x Mode, I_O=100mA
1.5x Mode, I_O=100mA
I_LED=15mA
I_LED=20mA
On Inputs EN, CTR0, 1 & 2
On Inputs EN, CTR0, 1 & 2
On Inputs EN, CTR0, 1 & 2
Min
2.7
1.19
0.4
1.5
Typ.
0.05
0.6
2.5
1.23
5.0
15.0
30.0
±5
±3
1.7
4.3
1.0
3.45
3.60
0.6
Max
5.5
1
1.2
5
1.25
0.9
1
0.4
Unit
V
µA
mA
mA
V
mA
%
%
Ω
MHz
V
ms
µA
V
V
Typical Characteristics
V_IN=3.6V, EN=V_IN, R_SET=24kΩ, C_IN=1µF, T_A=25ºC, unless otherwise noted.
1. Efficiency vs Input Voltage (4 LEDs)
2. Efficiency vs Output Current (4 LEDs)
Rev. C – 10/31/2007
SP6887 4 Channel WLED Driver
4/10
© 2007 Exar Corporation