MAX8790ETP+ Maxim Integrated Products, MAX8790ETP+ Datasheet - Page 6

• Manufacturer Part Number: MAX8790ETP+
• Description: IC LED DRVR WHITE BCKLGT 20-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LEDr

Specifications of MAX8790ETP+

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: No
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 1MHz
• Voltage - Supply: 4.5 V ~ 5.5 V, 5.5 V ~ 26 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 20-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 25mA
• Internal Switch(s): Yes
• Low Level Output Current: 1000000 uA (Typ)
• High Level Output Current: 25.75 mA
• Operating Supply Voltage: 4.5 V to 26 V
• Maximum Supply Current: 2 mA
• Maximum Power Dissipation: 1349 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
(Circuit configuration 1, V
6
21.0
20.8
20.6
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
94
93
92
91
90
89
88
87
86
_______________________________________________________________________________________
vs. AMBIENT TEMPERATURE (BRT = 100%)
7
6
5
4
3
2
1
0
7
0
7
SUPPLY CURRENT vs. INPUT VOLTAGE
vs. INPUT VOLTAGE (BRT = 100%)
BOOST CONVERTER EFFICIENCY
AMBIENT TEMPERATURE (°)
20
750kHz
(DPWM DIMMING)
INPUT VOLTAGE (V)
12
INPUT VOLTAGE (V)
LED CURRENT
12
500kHz
40
BRT = 100%
BRT = 0%
IN
= 12V, V
17
17
1MHz
60
SHDN
80
= V
IN
, LEDs = 8 series x 6 parallel strings, ISET = V
-0.01
-0.02
-0.03
-0.04
-0.05
0.05
0.04
0.03
0.02
0.01
1.2
1.0
0.8
0.6
0.4
0.2
NORMALIZED POWER vs. TOTAL LED CURRENT
0
0
7
6
5
4
3
2
1
0
SHUTDOWN CURRENT vs. INPUT VOLTAGE
1
7
7
NORMALIZED TO V
V
DPWM DIMMING
BRT = 100%
IN
(ANALOG AND DPWM DIMMING)
= 7V
POWER, DPWM
TOTAL INPUT
LED CURRENT REGULATION
POWER, ANALOG
TOTAL LED CURRENT (mA)
ANALOG DIMMING
BRT = 10%
vs. INPUT VOLTAGE
TOTAL INPUT
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
10
12
12
DPWM DIMMING
BRT = 10%
IN
= 20V, AND I
POWER, ANALOG
Typical Operating Characteristics
TOTAL LED
100
POWER, DPWM
17
17
TOTAL LED
LED
= 20mA
1000
CC
0.7
0.6
0.5
0.4
0.3
0.2
0.1
25
20
15
10
5
0
0
1
, T
0
IDENTICAL FOR DPWM DIMMING
AND ANALOG DIMMING
LED CURRENT vs. BRT DUTY CYCLE
A
FB_ VOLTAGE vs. LED CURRENT
= +25°C, unless otherwise noted.)
5
SWITCHING WAVEFORMS
LED STRING CURRENT (mA)
(ANALOG DIMMING)
BRT DUTY CYCLE (%)
(BRT AT 200Hz)
10
(BRT = 100%)
200ns/div
10
15
20
MAX8790 toc09
25
100
30
V
10V/div
0V
I
500mA/div
0mA
L
LX