Datasheet

MAX8543/MAX8544
Step-Down Controllers with Prebias Startup,
Lossless Sensing, Synchronization, and OVP
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 13.2V, V
BST
- V
LX
= 5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS
MIN MAX
UNITS
POK
Power-OK Threshold
V
FB
rising, percent of V
OUT
,
typical hysteresis is 3%
88 94 %
POK Output Voltage, Low V
FB
= 0.6V, I
POK
= 2mA 200 mV
POK Leakage Current, High V
POK
= 5.5V 1 µA
OVERVOLTAGE PROTECTION (OVP)
Output Overvoltage Fault-Trip level
Rising edge compared to regulation set point;
triggers after one or two clock cycles
+110 +120
%
MODE CONTROL
MODE Logic-Level Low 3V ≤ V
VL
≤ 5.5V
0.4 V
MODE Logic-Level High 3V ≤ V
VL
≤ 5.5V
1.8 V
V
MODE
= 0V -1 +1
MODE Input Current
MODE = VL 10
µA
SHUTDOWN CONTROL
EN Logic-Level Low 3V ≤ V
VL
≤ 5.5V
0.45
V
EN Logic-Level High 3V ≤ V
VL
≤ 5.5V
2 V
V
EN
= 0V or 5.5V -1 +4
EN Input Current
V
EN
= 13.2V 6
µA
Note 1: Maximum output voltage is limited by maximum duty cycle and external components.
Note 2: Specifications to -40°C are guaranteed by design and not production tested.