MAX8901BETA+T Maxim Integrated Products, MAX8901BETA+T Datasheet - Page 5

• Manufacturer Part Number: MAX8901BETA+T
• Description: IC LED DRIVR WHITE BCKLGT 8-TDFN
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LEDr

Specifications of MAX8901BETA+T

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 700kHz ~ 800kHz
• Voltage - Supply: 2.6 V ~ 5.5 V
• Voltage - Output: 24V
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 25mA
• Internal Switch(s): Yes
• Efficiency: 91%
• Operating Supply Voltage: 2.6 V to 5.5 V
• Maximum Supply Current: 185 uA
• Maximum Power Dissipation: 953 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(Circuit of Figure 5, I
Series WLEDs in a 2mm x 2mm TDFN Package
I
SUPPLY
V
V
I
LEDs
V
OUT
V
OUT
95
90
85
80
75
70
I
ON
LX
LX
V
I
LED
2
_______________________________________________________________________________________
= 24.75mA, V
LED AND BOOST EFFICIENCY
STARTUP AND SHUTDOWN
SWITCHING WAVEFORMS
RESPONSE (MAX8901A)
6WLEDs,
INDUCTOR: TOKO A915AY-220M,
DIODE: CENTRAL SEMI CMDSH05-4
3
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
Highest Efficiency Supply for 2 to 6
10ms/div
1μs/div
4
IN
BOOST
= V
LED
ON
5
C2 = 0.1μF
MAX8901A/B toc11
MAX8901A/B toc9
= 3.6V, C1 = 1µF, C2 = 1µF, T
Typical Operating Characteristics (continued)
6
100mV/div
AC-COUPLED
100mA/div
50mV/div
AC-COUPLED
10V/div
0V
0mA
0V
0V
100mA/div
0mA
20mA/div
0mA
2V/div
10V/div
I
SUPPLY
V
I
V
I
LEDs
LEDs
800
700
600
500
400
300
200
100
OUT
V
V
V
OUT
LX
ON
IN
0
2
A
= +25°C, unless otherwise noted.)
STARTUP AND SHUTDOWN
PROTECTION RESPONSE
3
RESPONSE (MAX8901B)
INPUT OVERVOLTAGE
vs. SUPPLY VOLTAGE
MAX8901B
SUPPLY VOLTAGE (V)
IN CURRENT (I
4
20ms/div
10ms/div
MAX8901A
5.4V
5
IN
)
6.4V
MAX8901A/B toc10
MAX8901A/B toc12
6
7
20mA/div
0mA
20mA/div
0V
1V/div
(AC-COUPLED)
10V/div
0V
100mA/div
20mA/div
2V/div
0V
10V/div
0V
0mA
0mA
5