MAX8655 查看數據表（PDF） - Maxim Integrated
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MAX8655 Datasheet PDF : 23 Pages
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Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 12V, VBST - VLX = 6.5V, TA = -40°C to +85°C, circuit of Figure 4, typical values are at TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
OSCILLATOR
Switching Frequency
Minimum Off-Time
RFSYNC = 21.0kΩ
RFSYNC = 143kΩ
Measured at LX
800 1000 1200
kHz
160
200
240
235
ns
Minimum On-Time
Measured at LX
75
100
ns
FSYNC Synchronization Range
160
1200 kHz
FSYNC Input High Pulse Width
100
ns
FSYNC Input Low Pulse Width
100
ns
FSYNC Rise/Fall Time
SYNCO Phase Shift
100
ns
180
Degrees
SYNCO Output Low Level
SYNCO Output High Level
FSYNC Input Low
ISYNCO = 5mA
ISYNCO = -5mA
VAVL - 1V
0.4
V
V
0.4
V
FSYNC Input High
2.5
V
THERMAL PROTECTION
Thermal Shutdown
Thermal-Shutdown Hysteresis
Rising temperature
+160
°C
15
°C
POK
POK Threshold
POK Output Voltage, Low
POK Leakage Current, High
OVP
OVP Threshold Voltage
OVP, Leakage Current, High
MODE CONTROL
REFIN = AVL, VFB rising, typical hysteresis is 3%
629
650
671
mV
VREFIN = 0.75V to 1.5V, VFB rising, typical hysteresis is 3% 88.7 91.7 94.7
%
VFB = 0.6V, IPOK = 2mA
25
200
mV
VPOK = 5.5V
1
µA
REFIN = AVL
VREFIN = 0.7V to 1.5V
VOVP = 0.8V
770
800
840
mV
110
115
120
%
500
nA
MODE Logic-Level Low
4.5V ≤ VAVL ≤ 5.5V
0.4
V
MODE Logic-Level High
MODE Input Current
4.5V ≤ VAVL ≤ 5.5V
VMODE = 0 to VAVL
1.8
V
-1
+1
µA
SHUTDOWN CONTROL
EN Logic-Level Low
4.5V ≤ VAVL ≤ 5.5V
0.45
V
EN Logic-Level High
4.5V ≤ VAVL ≤ 5.5V
2
V
EN Input Current
VEN = 0V
VEN = 28V
-1
+1
µA
1.5
6.0
Note 2: Specifications are 100% production tested at TA = +85°C. Limits over the operating temperature range are guaranteed by
design.
4 _______________________________________________________________________________________
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