MAX8901B Maxim Integrated Products, MAX8901B Datasheet - Page 6

• 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
6
_______________________________________________________________________________________
V
I
25.0
24.8
24.6
24.4
24.2
24.0
LEDs
V
V
OUT
V
30
25
20
15
10
ON
CS
IN
5
0
-40
0
LED
vs. TEMPERATURE (MAX8901B)
D = 90%
PWM DIMMING RESPONSE
-15
20
MAXIMUM LED CURRENT
LED CURRENT vs. PWM
= 24.75mA, V
DIMMING (MAX8901A)
PWM DUTY CYCLE (%)
TEMPERATURE (°C)
(MAX8901A)
40
10
4ms/div
f
CYCLE CHANGE: 90% TO
10%, C2 = 0.1μF
ON_PWM
D = 10%
60
35
IN
= 100kHz, DUTY
R
f
PWM
CS
= V
= 20Ω,
MAX8901A/B toc13
80
= 100kHz
60
ON
= 3.6V, C1 = 1µF, C2 = 1µF, T
Typical Operating Characteristics (continued)
100
85
20mV/div
20mA/div
2V/div
0V
50mV/div
(AC-COUPLED)
500mV/div
0V
0V
0mA
501.0
500.8
500.6
500.4
500.2
500.0
499.8
499.6
499.4
V
I
LEDs
750
745
740
735
730
V
V
OUT
V
ON
CS
IN
-40
0
vs. TEMPERATURE (MAX8901B)
5
V
I
A
LED
-15
CS
MINIMUM LED CURRENT
SERIAL PULSE DIMMING
RESPONSE (MAX8901B)
= +25°C, unless otherwise noted.)
= 24.75mA
vs. LED CURRENT STEP
10
LED CURRENT STEP
TEMPERATURE (°C)
(MAX8901B)
10
15
10ms/div
I
LED
20
35
= 0.75mA
25
MAX8901A/B toc14
60
30
35
85
20mV/div
20mA/div
2V/div
0V
50mV/div
(AC-COUPLED)
1V/div
0V
0V
0mA