MAX8595Z MAXIM [Maxim Integrated Products], MAX8595Z Datasheet - Page 4

• Manufacturer Part Number: MAX8595Z
• Description: High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDs
• Manufacturer: MAXIM [Maxim Integrated Products]

High-Efficiency, 32V Step-Up Converters
with T
(Circuit of Figure 1, V
T
4
A
= +25°C, unless otherwise noted.)
_______________________________________________________________________________________
V
100
V
OUT
95
90
85
80
75
70
65
60
55
50
V
30
25
20
15
10
LX
IN
I
5
0
L
2
0
A
3 LEDs
IN
vs. DIRECT-PWM DIMMING
Derating Option for 2 to 8 White LEDs
SWITCHING WAVEFORMS
20
= 3.6V, I
3
vs. INPUT VOLTAGE
6 LEDs
INPUT VOLTAGE (V)
4 LEDs
LED CURRENT
DUTY CYCLE (%)
EFFICIENCY
8 LEDs
40
500ns/div
LED
4
= 25mA, L = 22µH, C
60
5
MAX8595Z toc05
80
100
6
20mV/div
AC-COUPLED
10V/div
200mV/div
AC-COUPLED
100mA/div
IN
= 2.2µF, C
Typical Operating Characteristics
OUT
= 0.1µF, C
V
V
CTRL
I
90
85
80
75
70
65
60
OUT
26
24
22
20
18
16
14
12
10
LED
I
8
IN
-40
SOFT-START AND SHUTDOWN RESPONSE
0
MAX8596,
I
LED
-20
= 25mA AT T
vs. AMBIENT TEMPERATURE
COMP
5
MAX8595,
I
LED
6 LEDs
= 15mA
0
vs. LED CURRENT
LED CURRENT (mA)
TEMPERATURE (°C)
10
LED CURRENT
= 0.1µF, R
EFFICIENCY
A
20
20ms/div
= +25°C
15
8 LEDs
40
20
SENSE
3 LEDs
60
MAX8595Z toc06
25
80
= 13Ω, 4 LEDs,
100
30
0
0
0
0
2V/div
100mA/div
40mA/div
10V/div