MAX8595ZETA-T Maxim Integrated Products, MAX8595ZETA-T Datasheet - Page 5

• Manufacturer Part Number: MAX8595ZETA-T
• Description: LED Drivers HIgh Efficiency 32V Step-Up Converter fo
• Manufacturer: Maxim Integrated Products

Specifications of MAX8595ZETA-T

• Number Of Segments: 8
• Operating Supply Voltage: 2.6 V to 5.5 V
• Maximum Power Dissipation: 1950 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TDFN EP
• Minimum Operating Temperature: - 40 C

(Circuit of Figure 1, V
unless otherwise noted.)
PIN
—
1
2
3
4
5
6
7
8
V
V
CTRL
with T
I
OUT
LED
I
IN
NAME
COMP
PGND
CTRL
GND
OUT
IN
_______________________________________________________________________________________
CS
LX
EP
IN
= 3.6V, I
CTRL STEP RESPONSE
High-Efficiency, 36V Step-Up Converters
A
LED
Overvoltage Sense. When V
until V
from OUT to ground. In shutdown, V
Input Voltage Supply. The input voltage range is 2.6V to 6.0V. Connect a 2.2µF ceramic capacitor
from IN to GND.
Brightness Control Input. The voltage applied to CTRL controls LED brightness. Varying the voltage
from 0.24V to 1.65V (1.72V for the MAX8596X) adjusts the brightness from dim to 100% brightness,
respectively. Any voltage above 1.65V (1.72V) does not increase brightness. Hold CTRL below
100mV to shut down the IC after an 8.2ms delay.
Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED bias current. The
voltage at CS regulates to V
Compensation Input. Connect a 0.1µF ceramic capacitor (C
stabilizes the converter, controls soft-start, and lowpass filters direct PWM dimming at CTRL. C
discharges to 0V through an internal 20kΩ resistor in shutdown.
Ground. Connect to PGND and the exposed pad directly under the IC.
Power Ground. Connect to GND and the exposed pad directly under the IC.
Inductor Connection. Connect LX to the node between the inductor and the Schottky diode. LX is
high impedance in shutdown.
Exposed Pad. Connect to a large ground plane for maximum package heat dissipation. Connect
directly to GND and PGND under the IC.
20ms/div
= 25mA, L = 22µH, C
Derating Option for 2 to 9 White LEDs
OUT
drops below 36V (typ), then the IC reenters soft-start. Connect a 0.1µF ceramic capacitor
MAX8595X toc07
Typical Operating Characteristics (continued)
0
0
0
0
1V/div
100mA/div
40mA/div
10V/div
IN
= 2.2µF, C
OUT
CTRL
is greater than 38V (typ), the internal n-channel MOSFET turns off
/ 5 or 0.330V (0.343V for the MAX8596X), whichever is lower.
OUT
OUT
is one diode drop below V
= 0.1µF, C
FUNCTION
V
V
CTRL
I
OUT
LED
V
IN
COMP
DIRECT-PWM DIMMING RESPONSE
= 0.1µF, R
COMP
10µs/div
) from COMP to GND. C
IN
SENSE
.
= 13Ω, 4 LEDs, T
Pin Description
MAX8595X toc08
0
0
0
0
2V/div
32kHz 50%
DUTY CYCLE
20mV/div
AC-COUPLED
10mA/div
500mV/div
AC-COUPLED
COMP
A
= +25°C,
COMP
5