Rainbow Electronics MAX1813 - Manual (Page 6)

MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, V CC = V DD = 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = V CC , V OUT set to 1.5V,
T A = -40 °C to +85°C, unless otherwise noted.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
Shutdown Supply Current (V+) SKP/SDN = GND, V CC = V DD = 0 or 5V 5 µA
Reference Voltage V REF V CC = 4.5V to 5.5V, -40 µA ≤ I
REF
≤ +40µA 1.98 2.02 V
REF Fault Lockout Voltage Falling edge, 1% hysteresis 1.5 1.7 V
FAULT PROTECTION
CODE = GND 2.20 2.30 Output Overvoltage Fault Preset
Threshold
V OVP Measured at FB
CODE = V
CC
1.95 2.05
V
Output Undervoltage Fault
Threshhold
With respect to unloaded output voltage 60 80 %
Current-Limit Threshold
(Positive, Default)
V ITH V GND - V VPCS , ILIM = V CC 40 60 mV
V ILIM = 0.5V 40 60 Current-Limit Threshold
(Positive, Adjustable)
V ITH V GND - V VPCS
V ILIM = 2V (REF) 143 265
mV
Negative Current-Limit Threshold
V GND - V VPCS , with respect to V ITH ,
ILIM = V CC
-75 -35 mV
V CC Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, switching
disabled below this level
4.05 4.45 V
PGOOD Lower Trip Threshold
Measured at FB with respect to unloaded
output voltage, falling edge
-15 -10.5 %
PGOOD Upper Trip Threshold
Measured at FB with respect to unloaded
output voltage, rising edge
8 12 %
PGOOD Output Low Voltage I SINK = 1mA 0.4 V
PGOOD Leakage Current High state, forced to 5.5V 1 µA
GATE DRIVERS
DH Gate Driver On-Resistance R ON ( D H ) V BST - V LX forced to 5V 3.5 Ω
High state (pull up) 3.5
DL Gate Driver On-Resistance R ON(DL)
Low state (pull down) 1.0
Ω
LOGIC AND I/O
Logic Input High Voltage V IH
D0 −D4, CODE, SUS, ZMODE; V
CC = 4.5V
to 5.5V
2.4 V
Logic Input Low Voltage V IL
D0 −D4, CODE, SUS, ZMODE; V
CC = 4.5V
to 5.5V
0.8 V
DAC Z-Mode Programming
Resistor, Low
D0 −D4, 0 to 0.4V or 2.6V to 5.5V applied to
the resistor, ZMODE = CODE = GND or
ZMODE = CODE = V
CC
1.05 k Ω
DAC Z-Mode Programming
Resistor, High
D0 −D4, 0 to 0.4V or 2.6V to 5.5V applied to
the resistor, ZMODE = CODE = GND or
ZMODE = CODE = V
CC
95 k Ω
D0 −D4, CODE = V
CC -1 +1
Logic Input Current
SUS, ZMODE = GND or V CC -1 +1
µA