LP3359 Datasheet, PDF (3/9 Pages) Lowpower Semiconductor inc – High performance, Current Source For Parallel White-LED Driver

LP3359
Electrical Characteristics
(Limits in standard typeface and typical values apply for TA=25°C. Limits in boldface type apply over the operating junction temperature
range (-40°C~+85°C). Unless otherwise specified: VIN=5V, VLEDX=3.6V, RSET=7.5k, V(EN/PWM)=VIN.)
Symbol Description
Conditions
Min Typ Max Units
ILEDx
LED Current
3.0V ≤ VIN ≤ 5.5V 2.0V ≤ VLEDX ≤
(VIN-0.4V) RSET=7.5k
15.8
14.3
mA
17.3
ILEDX-MATCH Current Matching Between
Any Two Outputs
±0.3
±1
%
VSET
ISET Pin Voltage
1.06
1.3
1.18
V
(-8%)
(+8%)
Output Current to Current
100
ILEDX/ISET Set Ratio
VHR
Current Source Headroom ILED=95% × ILED(nom), RSET= 4.7K
Voltage
(ILED(nom) approx. 25mA)
320 440
mV
ILED=95% × ILED(nom), RSET= 12K
(ILED(nom) approx. 10mA)
130 220
ILED=0mA, RSET=Open
IQ
Quiescent Supply Current
ILED=0mA, RSET=7.5k
175 285
uA
325
ISHUT-DOWN Shutdown Supply Current EN/PWM=0
0.01 1
V
LP3359-datasheet Ver.1.1 Nov.-2005
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