MAX8901B Maxim Integrated Products, MAX8901B Datasheet - Page 4

• Manufacturer Part Number: MAX8901B
• Description: Highest Efficiency Supply
• Manufacturer: Maxim Integrated Products

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Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
(Circuit of Figure 5, I
4
_______________________________________________________________________________________
LED
90
85
80
75
70
65
60
55
50
90
85
80
75
70
90
85
80
75
70
65
60
55
50
= 24.75mA, V
2
0
0
LED EFFICIENCY vs. INPUT VOLTAGE
LED EFFICIENCY vs. LED CURRENT
LED EFFICIENCY vs. LED CURRENT
5
5
V
3
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4
IN
INPUT VOLTAGE (V)
LED CURRENT (mA)
LED CURRENT (mA)
= 3.6V
V
V
IN
(6 WLEDs)
10
(4 WLEDs)
4 WLEDs
6 WLEDs
10
IN
IN
= 5V
= 5V
= V
4
V
V
IN
IN
15
15
ON
= 4.2V
= 4.2V
V
IN
V
= 5.5V
= 3.6V, C1 = 1µF, C2 = 1µF, T
3 WLEDs
IN
V
IN
5
= 3.6V
V
= 5.5V
20
20
IN
V
IN
= 3V
= 3V
25
25
6
Typical Operating Characteristics
90
85
80
75
70
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
A
2
= +25°C, unless otherwise noted.)
0
0
LED EFFICIENCY vs. INPUT VOLTAGE
LED EFFICIENCY vs. LED CURRENT
LED EFFICIENCY vs. LED CURRENT
5
5
3
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB
V
INPUT VOLTAGE (V)
IN
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB
LED CURRENT (mA)
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB
LED CURRENT (mA)
6 WLEDs
= 5V
(6 WLEDs)
(4 WLEDs)
10
10
V
IN
V
4
= 5V V
IN
V
4 WLEDs
IN
= 4.2V
= 4.2V
15
15
V
IN
IN
V
V
IN
= 5.5V
= 5.5V
IN
5
= 3.6V
= 3.6V
3 WLEDs
20
20
V
V
IN
IN
= 3V
= 3V
25
25
6