MAX8596X datasheet(3/8 Pages) MAXIM

3 / 8 page

High-Efficiency, 36V Step-Up Converters

with TA Derating Option for 2 to 9 White LEDs

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 3.0V, L = 22µH, CIN = 2.2µF, COUT = 0.1µF, CCOMP = 0.1µF, RSENSE = 13

Ω, VCTRL = 1.5V, TA = -40°C to +85°C, unless other-

wise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CS Derating Function Slope

MAX8596X, VCTRL = 3.0V, TA = +42

°C to +85°C

-5.5

mV/

°C

CTRL Input Resistance

VCTRL < 1.5V

250

500

780

Ω

CTRL Dual-Mode Threshold

100

170

240

CTRL Dual-Mode Hysteresis

5mV

CTRL Shutdown Enable Delay

(Note 3)

6.0

8.2

10.5

CS to COMP Transconductance

VCOMP = 1.5V

µS

COMP Input Resistance to

Ground

In shutdown, UVLO or OVLO

Ω

OSCILLATOR

Operating Frequency

0.75

1.0

1.25

MHz

PWM mode

Minimum Duty Cycle

Pulse skipping

Maximum Duty Cycle

CTRL = IN, CS = GND

n-CHANNEL SWITCH

LX On-Resistance

ILX = 190mA

0.8

1.35

Ω

TA = +25

°C

0.01

LX Leakage Current

VLX = 36V, CTRL = GND

TA = +85

°C1

µA

LX Current Limit

Duty cycle = 90%

500

700

900

Note 1: Parameters are 100% production tested at TA = +25°C. Limits over the operating temperature range are regulated by

design and characterization.

Note 2: VD is the forward-voltage drop of the Schottky diode in Figure 1.

Note 3: Time from CTRL going below the Dual-Mode threshold to IC shutdown.

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