MAX1554ETA+T Maxim Integrated Products, MAX1554ETA+T Datasheet - Page 7

• 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

Figure 1. Circuit with the MAX1553 Driving Six White LEDs
DC CONTROL
2.7V TO 5.5V
PWM
INPUT
OR
4.7µF
C1
OFF
0.1µF
ON
C3
TOKO A920CY-470M
V
EN
BRT
SS
CC
_______________________________________________________________________________________
V
MAX1553
OV
CC
EN
47µH
L1
GND
REF
OV
LX
FB
CMDSH2-3
0.47µF
GENERATOR
REFERENCE
CIRCUITRY
BANDGAP
CONTROL
25V
D1
ENABLE
C2
UVLO
1.25V
BIAS
COMPARATOR
Converters for 2 to 10 White LEDs
R1
10Ω
OV
R2
200kΩ
R3
10kΩ
C4
4700pF
High-Efficiency, 40V Step-Up
D2–D7
WHITE
LEDs
MAX1553
MAX1554
CONTROL
LOGIC
COMPARATOR
ERROR
t
t
OFF
ON
MINIMUM
MINIMUM
CURRENT
Figure 2. Circuit with the MAX1553 Driving Nine White LEDs at
Up to 15mA
ONE-SHOT
ONE-SHOT
DC CONTROL
LIMIT
2.7V TO 5.5V
PWM
67kΩ
INPUT
OR
10µF
C1
OFF
DRIVER
0.1µF
ON
V
LIM
C3
128kΩ
REF
MURATA LQH32C
V
SS
EN
BRT
CC
MAX1553
4.7µH
L1
96kΩ
GND
LX
OV
FB
Functional Diagram
1.25V
110kΩ
CMDSH1-60M
0.47µF
50V
C2
D1
R1
10Ω
LX
GND
FB
BRT
SS
R2
330kΩ
R3
10kΩ
C4
3300pF
D2–D10
WHITE
LEDs
7