Rainbow Electronics MAX8596Z - Manual (Page 3)

MAX8595Z/MAX8596Z
High-Efficiency, 32V Step-Up Converters
with T A Derating Option for 2 to 8 White LEDs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.0V, L = 22µH, C IN = 2.2µF, C OUT = 0.1µF, C COMP = 0.1µF, R SENSE = 13 Ω, V
CTRL = 1.5V, T A = -40°C to +85°C , unless other-
wise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
CS Derating Function Slope MAX8596Z, V CTRL = 3.0V, T A = +42 °C to +85°C -5.5 mV/ °C
CTRL Input Resistance V CTRL < 1.5V 250 500 780 k Ω
CTRL Dual-Mode Threshold 100 170 240 mV
CTRL Dual-Mode Hysteresis 5 mV
CTRL Shutdown Enable Delay (Note 3) 6.0 8.2 10.5 ms
CS to COMP Transconductance V COMP = 1.5V 32 50 82 µS
COMP Input Resistance to
Ground
In shutdown, UVLO or OVLO 20 k Ω
OSCILLATOR
Operating Frequency 0.75 1.0 1.25 MHz
PWM mode 12
Minimum Duty Cycle
Pulse skipping 0
%
Maximum Duty Cycle CTRL = IN, CS = GND 94 95 %
N-CHANNEL SWITCH
LX On-Resistance I LX = 190mA 0.8 1.35 Ω
T A = +25 °C 0.01 5
LX Leakage Current V LX = 36V, CTRL = GND
T
A
= +85 °C 1
µA
LX Current Limit Duty cycle = 90% 500 700 900 mA
Note 1: Parameters are 100% production tested at T A = +25°C. Limits over the operating temperature range are regulated by
design and characterization.
Note 2: V D 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.