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MAX8595Z Fiches technique(PDF) 5 Page - Maxim Integrated Products

No de pièce MAX8595Z
Description  High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDs
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8595Z Fiches technique(HTML) 5 Page - Maxim Integrated Products

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High-Efficiency, 32V Step-Up Converters
with TA Derating Option for 2 to 8 White LEDs
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 3.6V, ILED = 25mA, L = 22µH, CIN = 2.2µF, COUT = 0.1µF, CCOMP = 0.1µF, RSENSE = 13
Ω, 4 LEDs,
TA = +25°C, unless otherwise noted.)
Pin Description
PIN
NAME
FUNCTION
1
OUT
Overvoltage Sense. When VOUT is greater than 34V (typ), the internal n-channel MOSFET turns off
until VOUT drops below 32V (typ), then the IC re-enters soft-start. Connect a 0.1µF ceramic capacitor
from OUT to ground. In shutdown, VOUT is one diode drop below VIN.
2IN
Input Voltage Supply. The input voltage range is 2.6V to 5.5V. Connect a 2.2µF ceramic capacitor
from IN to GND.
3
CTRL
Brightness Control Input. The voltage applied to CTRL controls LED brightness. Varying the voltage
from 0.24V to 1.65V (1.72V for the MAX8596Z) 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.
4CS
Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED bias current. The
voltage at CS regulates to VCTRL / 5 or 0.330V (0.343V for the MAX8596Z), whichever is lower.
5
COMP
Compensation Input. Connect a 0.1µF ceramic capacitor (CCOMP) from COMP to GND. CCOMP
stabilizes the converter, controls soft-start, and lowpass filters direct PWM dimming at CTRL. CCOMP
discharges to 0V through an internal 20k
Ω resistor in shutdown.
6
GND
Ground. Connect to PGND and the exposed pad directly under the IC.
7
PGND
Power Ground. Connect to GND and the exposed pad directly under the IC.
8LX
Inductor Connection. Connect LX to the node between the inductor and the Schottky diode. LX is
high impedance in shutdown.
—EP
Exposed Pad. Connect to a large ground plane for maximum package heat dissipation. Connect
directly to GND and PGND under the IC.
DIRECT-PWM DIMMING RESPONSE
MAX8595Z toc08
10
µs/div
VCTRL
2V/div
32kHz 50%
DUTY CYCLE
0
0
0
0
500mV/div
AC-COUPLED
10mA/div
20mV/div
AC-COUPLED
VIN
VOUT
ILED
CTRL STEP RESPONSE
MAX8595Z toc07
20ms/div
VCTRL
1V/div
0
0
0
0
40mA/div
10V/div
100mA/div
IIN
ILED
VOUT


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