ELM901FxA 1A 2x Charge Pump LED Driver
■Pin Configuration
QFN16-4x4(TOP VIEW) QFN16-4x4(BOTTOM VIEW)
9
10
11
12
12
11
10
9
Pin no.
Pin name
ISET2
ISET1
EN2
EN1
AGND
FS
1
2
3
4
5
13
14
15
16
8
7
6
5
8
7
6
5
13
14
15
16
6
2
1
3
4
4
3
2
1
7
VIN
8
9
PGND1
CM
QFN16-3x3(TOP VIEW) QFN16-3x3(BOTTOM VIEW)
10
11
12
13
14
15
16
PVIN
CP
NC
VO
NC
9
10 11 12
12 11 10
9
8
7
6
5
13
14
15
16
13
14
15
16
8
7
6
5
PGND2
LED
1
2
3
4
4
3
2
1
■Pin description
ISET2 : LED current setting 2
The pin that is for the connection of LED current setting resistor(Rset2) between ISET2-GND. The output
becomes 1.22V constantly when EN2 is high. The constant current of LED pin will be 3250x of the one
flows to ISET2.
(e.g.) when Rset2=6.8kΩ, Iled=1.22/6.8k×3250=583mA.
ISET1 : LED current setting 1
The pin that is for the connection of LED current setting resistor(Rset1) between ISET1-GND. The output
becomes 1.22V constantly when EN1 is high. The constant current of LED pin will be 3250x of the one
flows to ISET1.
(e.g.) when Rset1=20kΩ, Iled=1.22/20k×3250=198.3mA.
EN2 : on/off control 2
LED output current on/off control pin of set current of ISET2. This pin is pulled down to ground inside
the IC and the control logic is high active. The set current of ISET2 sinks from LED pin when this pin is
connected to VIN.
11 - 2
ELM [ ELM ELECTRONICS ]
