Datasheet

MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
INA
= 12V, VL = AVL, V
REFIN
= 1V, V
RS+
- V
RS-
= 1V, V
RS-
= 0V, V
EN/SLOPE
= 1.25V, V
CS+
= V
CS-
= 1V, R
ILIM
= 122kΩ, C
VL
= 1μF,
C
AVL
= 0.22μF, C
FREQ
= 270pF, T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER
V
REFIN
= 3.3V 3.267 3.3 3.333
Remote-Sense Accuracy
(Including Error Amplifier Offset)
Measure as V
RS+
- V
RS-
(T
A
= -40°C to +85°C)
V
REFIN
= 0.7V 0.693 0.7 0.707
V
Transconductance T
A
= -40°C to +85°C 1.1 1.7 2.6 mS
COMP Source Current V
RS+
- V
RS-
= 1.3V 220 300 μA
COMP Sink Current V
RS+
- V
RS-
= 0.7V 220 300 μA
COMP Shutdown Resistance V
EN/SLOPE
= 0V 20 100 Ω
RS+/RS- Input Leakage Current 0.2 1.5 μA
RS+ Input Common-Mode Range V
IN
= V
INA
= V
VL
= V
AVL
= 4.5V, V
RS-
= 100mV 0 3.4 V
RS- Input Common-Mode Range -100 +100 mV
CURRENT-SENSE AMPLIFIER
Input Offset Voltage
Measure at CS+ and CS-, V
CS+
= V
CS-
= 0.7V and 5.5V
(T
A
= -40°C to +85°C)
-1.5 +1.5 mV
Current-Sense Amplifier Gain
V
CS-
= 0 to 5V, V
CS+
- V
CS-
= 30mV,
T
A
= -40°C to +85°C
29.0 30.5 32.0 V/V
Input Bias Current V
CS+
= V
CS-
= 5.5V and 0V -4 +4 μA
CURRENT LIMIT
ILIM Output Current V
ILIM
= 2V, T
A
= -40°C to +85°C 9 10 11 μA
R
ILIM
= 122kΩ 16 20 23
Current-Limit Threshold
Measure as V
CS+
- V
CS-
(T
A
= -40°C to +85°C)
R
ILIM
= 275kΩ 38 45 52
mV
COMP Clamp Voltage High R
ILIM
= 275kΩ, V
REFIN
= 3.3V, V
RS+
- V
RS-
= 2V 3.6 3.8 4.0 V
COMP Clamp Voltage Low V
REFIN
= 3.3V, V
RS+
- V
RS-
= 3.35V 0.54 0.6 0.66 V
Maximum Peak Positive Current
Threshold
R
ILIM
= 275kΩ, no slope compensation 54 mV