MAX8678ETE+ Maxim Integrated Products, MAX8678ETE+ Datasheet - Page 5

• Manufacturer Part Number: MAX8678ETE+
• Description: IC LED DRVR WHITE BCKLGT 16-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LEDr

Specifications of MAX8678ETE+

• Constant Current: Yes
• Topology: PWM, Switched Capacitor (Charge Pump)
• Number Of Outputs: 4
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 1MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 24mA
• Internal Switch(s): Yes
• Low Level Output Current: 0.6 A
• High Level Output Current: 1.6 A
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Supply Current: 3 mA
• Maximum Power Dissipation: 1398 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

(V
IN
= 3.2V, R
L
= 8Ω, T
100
100
17.0
16.8
16.6
16.4
16.2
16.0
15.8
15.6
15.4
15.2
15.0
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
2.7
2.7
2.7
LED EFFICIENCY vs. SUPPLY VOLTAGE
LED EFFICIENCY vs. SUPPLY VOLTAGE
_______________________________________________________________________________________
4 x 1.6mA
1.6mA/LED
A
= +25°C, unless otherwise noted.)
3.0
3.0
3.0
LED CURRENT MATCHING
4 x 6.4mA
(MISMATCHED LEDs)
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
(MATCHED LEDs)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
3.3
3.3
3.3
4 x 20.8mA
3.6
3.6
3.6
6.4mA/LED
16.4mA/LED
20.4mA/LED
4 OF 16mA/LED
3.9
3.9
3.9
Typical Operating Characteristics (continued)
White LED Charge Pump with
4.2
4.2
4.2
1.1W Audio Amplifier
V
V
ENLED
200
180
160
140
120
100
100
LED1
80
60
40
20
90
80
70
60
50
40
0
I
IN
MAX8678 EFFICIENCY vs. SUPPLY VOLTAGE
4.2
SUPPLY CURRENT vs. SUPPLY VOLTAGE
4.20
3.90
4 x 20.8mA
20.4mA/LED
4 x 1.6mA
SUPPLY VOLTAGE, TIME WEIGHTED (V)
16.4mA/LED
3.85
3.9
SHUTDOWN WAVEFORMS
(MISMATCHED LEDs)
3.80
SUPPLY VOLTAGE (V)
(MATCHED LEDs)
LED STARTUP/
3.75
3.6
3.70
6.4mA/LED
1ms/div
3.65
3.60
3.3
4 x 6.4mA
3.55
4 x 16mA
3.50
3.0
1.6mA/LED
3.40
MAX8678 toc15
3.00
2.7
2V/div
1V/div
500mA/div
5