MAX1578ETG Maxim Integrated Products, MAX1578ETG Datasheet - Page 5

• Manufacturer Part Number: MAX1578ETG
• Description: LED Drivers HIgh Efficiency 32V Step-Up Converter fo
• Manufacturer: Maxim Integrated Products

Specifications of MAX1578ETG

• Number Of Segments: 8
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Power Dissipation: 1667 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN EP
• Minimum Operating Temperature: - 40 C

(Circuit of Figure 3, V
Complete Bias and White LED Power Supplies
AC-COUPLED
V
V
CTRL
OUT
V
I
IN
IN
1400
1200
1000
800
600
400
200
25
20
15
10
0
5
0
0
0
_______________________________________________________________________________________
IN
10
= 3.6V, I
SHUTDOWN WAVEFORMS
LCD BIAS SUPPLY CURRENT
DIRECT-PWM DUTY CYCLE
1
BOOST STARTUP AND
20 30
vs. INPUT VOLTAGE
PWM DUTY CYCLE (%)
LED CURRENT vs.
INPUT VOLTAGE (V)
2
4ms/div
LED
40 50
f
PWM
= 20mA, 4 LEDs, CTRL = IN, T
3
= 200Hz TO 200kHz
60 70 80 90 100
V
CTRL
4
= 0V
Typical Operating Characteristics (continued)
5
0V
100mA/div
2V/div
20mV/div
5V/div
A
= +25°C, unless otherwise noted.)
for Small TFT Displays
AC-COUPLED
AC-COUPLED
AC-COUPLED
AC-COUPLED
V
V
ONBIAS
V
V
V
CTRL
V
V
V
OUT
MAIN
OUT
V
V
NEG
POS
I
LX
IN
IN
IN
BOOST-SWITCHING WAVEFORMS
PWM-DIMMING WAVEFORMS
LCD BIAS STARTUP SEQUENCE
400ns/div
40μs/div
10ms/div
10V/div
2V/div
20mV/div
50mV/div
20mA/div
20mV/div
200mV/div
10V/div
5V/div
5V/div
5V/div
5