Rainbow Electronics MAX1791 - Manual (Page 5)

MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX, Step-Down
Controllers for Notebooks
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Note 1: Specifications to -40°C are guaranteed by design, not production tested.
Note 2: One-shot times are measured at the DH pin (VP = 15V, C
DH = 400pF, 90% point to 90% point; see drawing below for
measurement details).
ELECTRICAL CHARACTERISTICS (continued)
(V VP = 15V, VL enabled, C VL = 1µF, C REF = 0.1µF, T
A
= -40 to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VL Undervoltage Lockout
Threshold Rising edge, hysteresis = 20mV, PWM
disabled below this level
4.1 4.4 V
SHDN Logic Input High
Threshold Voltage
V IH 1.6 V
SHDN Logic Input Low
Threshold Voltage
V IL 0.6 V
MAX1762 V OUT = 1.8V fixed
MAX1791 V OUT = 3.3V fixed
50 150 mV
MAX1762 V OUT = 2.5V fixed
Dual Mode Threshold Voltage
MAX1791 V OUT = 5V fixed
2.5 4 V
DH
90% 90%
t ON