ELM901FxA 1A 2x Charge Pump LED Driver
■Electrical characteristics
When conditions are not mentioned specifically, Vin=3.6V, Cin=C1=2.2μF, Co=4.7μF, Ta=25°C
Parameter
Input voltage range
current consumption under
still condition 1
current consumption under
still condition 2
Symbol
Vin
Condition
Min.
2.6
Typ. Max.
4.4
Unit
V
Iqs1 1x mode, Iled=0mA
Iqs2 2x mode, Iled=0mA
300
550
μA
9
16
mA
μA
Standby current
Isd
EN1=EN2=0V
0.1
1.0
LED current
LED current ratio1
(Iled/Iset1/2)
LED current ratio2
(Iled/Iset1/2)
typ.×
0.96
typ.×
0.90
typ.×
1.04
typ.×
1.10
Iled1 Vin=3.8V, Iled=200mA, Vf=3.3V
3250
3250
125
mA/mA
mA/mA
mV
Vin=3.3 to 4.4V,
Iled2
Iled=200 to 800mA
Vled1 Mode switch threshold voltage,
(Min.) Iled=300mA
Vled2 Mode switch threshold voltage,
(Min.) Iled=150mA
Iled dropout voltage1
Iled dropout voltage2
225
120
80
100
mV
Mode switch delay time1
Mode switch delay time2
Td1 EN1=High, EN2=Low
Td2 EN1=Low or High, EN2=High
100
1
150
2
200
3
ms
ms
since EN is ON until LED current
LED current on time
Current capability
LED(on)
starts
50
130
250
μs
Iled Vin=3.3V, EN1=EN2=High, set
(Max.) Iled=1A, VF=4.6V
900
mA
LED current stablize time1
LED current stablize time2
LED current during soft
step-up
Charge pump
Soft step-up
TIled1 Iled=0mA→200mA
TIled2 Iled=200mA→700mA
40
60
μs
μs
Iled
set Iled=700mA
(soft)
250
75
350
450
300
mA
Tsoft Iled=700mA, Vo=3.7V→5.2V
Vo(x1) Iled=0mA
150
Vin
μs
V
1x mode output voltage
typ.×
0.95
typ.×
1.05
0.37
2x mode output voltage
1x mode output impedance
2x mode output impedance
Vo(x2) Iled=0mA
Ro(x1) Vin=3.4V
5.5
V
Ω
0.25
1.70
0.90
(2Vin-Vo)/Io, Vin=3.2V,
Vo=5.1V
Ro(x2)
2.55
1.08
Ω
Oscillation frequency
EN1, EN2
Output on control voltage
Output off control voltage
EN bias current
Fosc
0.72
0.95
MHz
Vc(ON) Vin=2.9 to 4.4V, each pin
Vc(OFF) Vin=2.9 to 4.4V, each pin
Ic(ON) Ven=3.6V, each pin
V
V
μA
0.45
50
20
ISET1, ISET2
Reference voltage
ISET set current
Vref Iset=50μA, each pin
1.202 1.220 1.238
310
V
μA
Iset
each pin
11 - 7
ELM-TECH [ ELM Technology Corporation ]
