MAX1554ETA+T Maxim Integrated Products, MAX1554ETA+T Datasheet - Page 4

• Manufacturer Part Number: MAX1554ETA+T
• Description: IC LED DRIVR WHITE BCKLGT 8-TDFN
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LEDr

Specifications of MAX1554ETA+T

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Voltage - Supply: 3.15 V ~ 5.5 V
• Voltage - Output: 40V
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 970mA
• Internal Switch(s): Yes
• Number Of Segments: 10
• Operating Supply Voltage: 3.15 V to 5.5 V
• Maximum Power Dissipation: 1951 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Efficiency: -
• Lead Free Status / Rohs Status: Details

High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
(MAX1553 driving six white LEDs, V
4
100
100
90
80
70
60
50
90
80
70
60
50
26
23
20
17
14
11
_______________________________________________________________________________________
3.0
0
0
WITH MAX1554 DRIVING 9 WHITE LEDS
CIRCUIT OF FIGURE 3
CIRCUIT OF FIGURE 3
L1 = 22µH
NO CAPACITOR ACROSS LEDs
LED CURRENT vs. INPUT VOLTAGE
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
WITH MAX1554 DRIVING 9 LEDS
V
V
CC
CC
3.5
DRIVING 6 WHITE LEDS
= 4V
= 4V
5
5
LOAD CURRENT (mA)
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
V
4.0
V
CC
CC
= 3.6V
= 3.6V
10
10
V
CC
4.5
= 5V
V
CC
V
15
15
= 5V
CC
5.0
= 3V
CC
= V
5.5
20
20
EN
= 3.6V, Circuit of Figure 1, T
100
90
80
70
60
50
26
23
20
17
14
11
35
30
25
20
15
10
5
0
2.5
0
0
R1 = 10Ω, V
L1 = 33µH
4700pF ACROSS LEDs
L1 = 22µH, NO CAPACITOR ACROSS LEDs
EFFICIENCY vs. LOAD CURRENT
V
3.0
0.6
CC
DRIVING 6 WHITE LEDS
= 4V
L1 = 33µH, 4700pF ACROSS LEDs
5
vs. INPUT VOLTAGE
vs. BRT VOLTAGE
LOAD CURRENT (mA)
BRT
INPUT VOLTAGE (V)
3.5
1.2
LED CURRENT
LED CURRENT
BRT VOLTAGE (V)
V
= 1.25V
CC
= 3.6V
4.0
1.8
10
L1 = 47µH,
4700pF ACROSS LEDs
Typical Operating Characteristics
V
CC
4.5
2.4
A
V
= 5V
CC
= +25°C, unless otherwise noted.)
15
= 3V
5.0
3.0
5.5
3.6
20
100
90
80
70
60
50
26
23
20
17
14
11
30
25
20
15
10
5
0
2.5
0
0
L1 = 22µH, NO CAPACITOR ACROSS LEDs
L1 = 47µH
4700pF ACROSS LEDs
R1 = 14Ω, V
L1 = 33µH, 4700pF ACROSS LEDs
EFFICIENCY vs. LOAD CURRENT
V
3.0
CC
20
DRIVING 6 WHITE LEDS
= 4V
vs. BRT DUTY CYCLE
5
vs. INPUT VOLTAGE
BRT DUTY CYCLE (%)
LOAD CURRENT (mA)
BRT
INPUT VOLTAGE (V)
3.5
LED CURRENT
LED CURRENT
V
= 3.3V
40
CC
= 3.6V
4.0
10
L1 = 47µH,
4700pF ACROSS LEDs
V
60
CC
4.5
V
= 5V
CC
15
= 3V
80
5.0
100
5.5
20