Datasheet

MAX8655
Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
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ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, V
BST
- V
LX
= 6.5V, T
A
= -40°C to +85°C, circuit of Figure 4, typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER
REFIN = AVL 0.693 0.7 0.707
FB Regulation Voltage
V
REFIN
= 0.7V to 1.5V
V
RE F IN
-
0.00375
V
REFIN
V
RE FIN
+
0.00375
V
Transconductance 70 110 160 µS
COMP Shutdown Resistance From COMP to GND, V
EN
= 0V 20 100 Ω
FB Input Leakage Current V
FB
= 0.7V 5 50 nA
FB Input Common-Mode Range -0.1 +1.5 V
CURRENT-SENSE AMPLIFIER
Voltage Gain V
C S +
- V
C S -
= 30m V , V
OUT
= 0 to 5.5V 12 V/V
CURRENT LIMIT
R
ILIM1
= 24kΩ 27.2 32 36.8
Peak Current-Limit
Threshold (V
CS+
- V
CS-
)
ILIM1 = AVL 60 80 92
mV
Negative Current Limit % of valley current limit -90 -120 -150 %
CS+, CS- Input Bias Current V
CS+
= V
CS-
= 0V or 5.5V -25 +25 µA
CS+, CS- Input Common-Mode
Range
0 5.5 V
SLOPE COMPENSATION
V
SCOMP
= 2.5V 231.25 250.00 268.75
V
SCOMP
= 1.25V 113.77 123.00 132.23
SCOMP = AVL 231.25 250.00 268.75
T
A
= 0°C to +85°C 113.77 123.00 132.23
Slope Compensation at Maximum
Duty Cycle
SCOMP = GND
T
A
= -40°C to +85°C 110.70 123.00 132.23
mV
SCOMP High Threshold
V
AVL
-
0.5
V
SCOMP Low Threshold 0.5 V
SCOMP Adjustment Range 1.25 2.50 V
SCOMP Input Leakage Current V
SCOMP
= 1.25V to 2.5V 5 200 nA