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MAX8901BETA+TCH8
P1-P3
P4-P6
P7-P9
P10-P12
P13-P14
MAX8901A/MAX8901B
Highest Ef
ficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
4
_______________________________________________________________________________________
T
ypical Operating Characteristics
(Circuit of Figure 5, I
LED
= 24.75mA, V
IN
= V
ON
= 3.6V, C1 = 1µF, C2 = 1µF, T
A
= +25°C, unless otherwise noted.)
90
85
80
75
70
24
35
6
LED EFFICIENCY vs. INPUT VOLTAGE
MAX8901A/B toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)
4 WLEDs
6 WLEDs
3 WLEDs
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4
90
85
80
75
70
24
35
6
LED EFFICIENCY vs. INPUT VOLTAGE
MAX8901A/B toc02
INPUT VOLTAGE (V)
EFFICIENCY (%)
4 WLEDs
6 WLEDs
3 WLEDs
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB
50
55
60
65
70
75
80
85
90
0
5
10
15
20
25
LED EFFICIENCY vs. LED CURRENT
(6 WLEDs)
MAX8901A/B toc03
LED CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5V
V
IN
= 5.5V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3V
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4
50
55
60
65
70
75
80
85
90
0
5
10
15
20
25
LED EFFICIENCY vs. LED CURRENT
(6 WLEDs)
MAX8901A/B toc04
LED CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5V
V
IN
= 5.5V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3V
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB
50
55
60
65
70
75
80
85
90
0
5
10
15
20
25
LED EFFICIENCY vs. LED CURRENT
(4 WLEDs)
MAX8901A/B toc05
LED CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5V
V
IN
= 5.5V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3V
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4
50
55
60
65
70
75
80
85
90
0
5
10
15
20
25
LED EFFICIENCY vs. LED CURRENT
(4 WLEDs)
MAX8901A/B toc06
LED CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5V
V
IN
= 5.5V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3V
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB
MAX8901A/MAX8901B
Highest Ef
ficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
_______________________________________________________________________________________
5
T
ypical Operating Characteristics (continued)
(Circuit of Figure 5, I
LED
= 24.75mA, V
IN
= V
ON
= 3.6V, C1 = 1µF, C2 = 1µF, T
A
= +25°C, unless otherwise noted.)
70
75
85
80
90
95
LED AND BOOST EFFICIENCY
vs. INPUT VOLTAGE
MAX8901A/B toc07
INPUT VOLTAGE (V)
EFFICIENCY (%)
24
35
6
BOOST
LED
6WLEDs,
INDUCTOR: TOKO A915AY-220M,
DIODE: CENTRAL SEMI CMDSH05-4
0
100
200
300
400
500
600
700
800
234567
IN CURRENT (I
IN
)
vs. SUPPLY VOLTAGE
MAX8901A/B toc08
SUPPLY VOLTAGE (V)
I
IN
(
μ
A)
MAX8901B
MAX8901A
1
μ
s/div
SWITCHING WAVEFORMS
50mV/div
AC-COUPLED
MAX8901A/B toc9
0mA
10V/div
0V
100mV/div
AC-COUPLED
100mA/div
V
I
V
LX
V
OUT
I
LX
20ms/div
INPUT OVERVOLTAGE
PROTECTION RESPONSE
MAX8901A/B toc10
0V
0mA
10V/div
1V/div
(AC-COUPLED)
0V
20mA/div
20mA/div
V
IN
V
OUT
I
LEDs
V
LX
6.4V
5.4V
10ms/div
STARTUP AND SHUTDOWN
RESPONSE (MAX8901A)
MAX8901A/B toc11
0mA
0mA
10V/div
2V/div
0V
0V
20mA/div
100mA/div
V
ON
V
OUT
I
SUPPLY
I
LEDs
C2 = 0.1
μ
F
10ms/div
STARTUP AND SHUTDOWN
RESPONSE (MAX8901B)
MAX8901A/B toc12
0mA
0mA
10V/div
2V/div
0V
0V
20mA/div
100mA/div
V
ON
V
OUT
I
SUPPLY
I
LEDs
MAX8901A/MAX8901B
Highest Ef
ficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
6
_______________________________________________________________________________________
T
ypical Operating Characteristics (continued)
(Circuit of Figure 5, I
LED
= 24.75mA, V
IN
= V
ON
= 3.6V, C1 = 1µF, C2 = 1µF, T
A
= +25°C, unless otherwise noted.)
V
CS
vs. LED CURRENT STEP
(MAX8901B)
LED CURRENT STEP
V
CS
(mV)
MAX8901A/B toc16
0
5
10
15
20
25
30
35
502.5
503.0
503.5
504.0
504.5
505.0
505.5
506.0
506.5
507.0
507.5
24.0
24.2
24.6
24.4
24.8
25.0
-40
10
-15
35
60
85
MAXIMUM LED CURRENT
vs. TEMPERATURE (MAX8901B)
MAX8901A/B toc17
TEMPERATURE (
°
C)
I
LED
(mA)
MINIMUM LED CURRENT
vs. TEMPERATURE (MAX8901B)
MAX8901A/B toc18
TEMPERATURE (
°
C)
I
LED
(
μ
A)
60
35
10
-15
735
740
745
750
730
-40
85
4ms/div
PWM DIMMING RESPONSE
(MAX8901A)
MAX8901A/B toc13
0V
0V
0mA
2V/div
0V
20mA/div
20mV/div
V
ON
V
IN
V
CS
V
OUT
I
LEDs
D = 10%
D = 90%
50mV/div
(AC-COUPLED)
500mV/div
f
ON_PWM
= 100kHz, DUTY
CYCLE CHANGE: 90% TO
10%, C2 = 0.1
μ
F
10ms/div
SERIAL PULSE DIMMING
RESPONSE (MAX8901B)
MAX8901A/B toc14
0V
0V
0mA
2V/div
0V
20mA/div
20mV/div
V
ON
V
IN
V
CS
V
OUT
I
LEDs
50mV/div
(AC-COUPLED)
1V/div
0
10
5
20
15
25
30
04
0
20
60
80
100
LED CURRENT vs. PWM
DIMMING (MAX8901A)
MAX8901A/B toc15
PWM DUTY CYCLE (%)
I
LED
(mA)
R
CS
= 20
Ω
,
f
PWM
= 100kHz
P1-P3
P4-P6
P7-P9
P10-P12
P13-P14
MAX8901BETA+TCH8
Mfr. #:
Buy MAX8901BETA+TCH8
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers Supply for 2 to 6 Series WLEDs
Lifecycle:
New from this manufacturer.
Delivery:
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EMS
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