a8435 Allegro MicroSystems, Inc., a8435 Datasheet - Page 5

• Manufacturer Part Number: a8435
• Description: High Efficiency Charge Pump White Led Driver
• Manufacturer: Allegro MicroSystems, Inc.

A8435
V
IN
= 3.6 V, EN1 = EN2 = VIN, C
Tests performed using application circuit shown in figure 1: dual wire control; and
120
100
80
60
40
20
0
2.70
100
20
19
18
17
16
15
14
13
12
11
10
90
80
70
60
50
Performance Characteristics
2.70
V
Matching Between LEDs <1% Over Range of V
2.0
IN
IN
Supply Current versus Supply Voltage
High Efficiency Charge Pump White LED Driver
2.90
Falling
LED Current versus Supply Voltage
= C
Over Range of Dimming Levels, V
Efficiency versus Supply Voltage
V
IN
2.90
Over Range of Dimming Levels (mA)
1
2.5
Falling
= C
3.10
2
V
3.10
= C
IN
3.0
Falling
OUT
3.30
3.30
3.5
= 1 μF, R
V
V
V
IN
IN
IN
(V)
(V)
(V)
3.50
4.0
3.50
SET
V
IN
3.70
4.5
Rising
V
= 7.5 kΩ, T
IN
3.70
Rising
IN
3.90
V
Falling
5.0
IN
Rising
3.90
4.10
A
5.5
IN
= 25°C (unless otherwise noted)
17.6 mA
4.75 mA
9.8 mA
4.10
Dimming Level
17.6 (Full Brightness)
4.75
9.8
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
(mA)
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
5