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MAX8650 Datasheet(PDF) 3 Page - Maxim Integrated Products

Part # MAX8650
Description  4.5V to 28V Input Current-Mode Step-Down Controller with Adjustable Frequency
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8650 Datasheet(HTML) 3 Page - Maxim Integrated Products

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4.5V to 28V Input Current-Mode Step-Down
Controller with Adjustable Frequency
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 12V, VBST - VLX = 6.5V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ERROR AMPLIFIER
REFIN = AVL
0.693
0.7
0.707
FB Regulation Voltage
VREFIN = 0.7V to 1.5V
VREFIN
-
0.00375
VREFIN
VREFIN
+
0.00375
V
Transconductance
70
110
160
µS
COMP Shutdown Resistance
From COMP to GND, VEN = 0V
20
100
Ω
FB Input Leakage Current
VFB = 0.7V
5
50
nA
FB Input Common-Mode Range
-0.1
+1.5
V
CURRENT-SENSE AMPLIFIER
Voltage Gain
VOUT = 0 to 5.5V, VCS+ - VCS- = 30mV
12
V/V
CURRENT LIMIT
RILIM1 = 24k
Ω
27.2
32.0
36.8
Peak Current-Limit
Threshold (VCS+ - VCS-)
ILIM1 = AVL
68.0
80.0
92.0
mV
RILIM2 = 50k
Ω
-42.5
-50.0
-57.5
Valley Current-Limit Threshold
(VLX - VPGND)
RILIM2 = 200k
Ω
-170
-200
-230
mV
Negative Current-Limit Threshold
% of (typ) positive direction current limit (VLX - VPGND)
-90
-120
-150
%
CS+, CS- Input Current
VCS+ = VCS- = 0V or 5.5V
-25
+25
µA
CS+, CS- Input Common-Mode
Range
0
5.5
V
SLOPE COMPENSATION
VSCOMP = 2.5V
231.25
250.00
268.75
VSCOMP = 1.25V
113.77
123.00
132.23
SCOMP = AVL
231.25
250.00
268.75
SCOMP = GND, TA = 0°C to +85°C
113.77
123.00
132.23
Slope Compensation at Maximum
Duty Cycle
TA = -40°C to +85°C
110.70
123.00
132.23
mV
SCOMP High Threshold
VAVL - 0.5
V
SCOMP Low Threshold
0.5
V
SCOMP Adjustment Range
1.25
2.5
V
SCOMP Input Leakage Current
VSCOMP = 1.25V to 2.5V
5
200
nA
OSCILLATOR
RFSYNC = 21.0k
Ω
800
1000
1200
Switching Frequency
RFSYNC = 143k
Ω
160
200
240
kHz
Minimum Off-Time
Measured at DH
235
ns
Minimum On-Time
Measured at DH
75
100
ns


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