MAX1887 データシートの表示（PDF） - Maxim Integrated
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MAX1887 Datasheet PDF : 33 Pages
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Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = 5V, VOUT = VCOMP = 1.2V, VCM+ = VCM- = VCS+ = VCS- = 1.2V, SHDN = VCC
(MAX1897), TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
CURRENT SENSING
On-Time Adjustment Range
0.42 < VCOMP < 2.8V, VOUT ≥ 0.7V
-40
COMP Output Current
ICOMP Sink and source
30
+40
%
µA
Current-Balance Offset
(VCM+ - VCM-) -
(VCS+ - VCS-), ICOMP =
0, -100mV ≤ (VCM+ -
VCM-) ≤ +100mV
MAX1887
MAX1897
-1.25
-1.25
+1.25
mV
+1.25
Current-Balance
Transconductance
(VCM+ - VCM-) - (VCS+ - VCS-) = ±25mV
1.2
mS
Current-Sense, Common-Mode
Range
Current-Sense Input Current
Positive Current-Limit Threshold
Negative Current-Limit
Threshold
ILIM Standby Threshold Voltage
ILIM Input Current
LIMIT Propagation Delay
LIMIT Output Low Voltage
LIMIT Leakage Current
FAULT PROTECTION
VCC/VDD Undervoltage Lockout
Threshold (Note 3)
Thermal Shutdown Threshold
GATE DRIVERS
DH Gate-Driver On-Resistance
(Note 4)
DL Gate-Driver On-Resistance
(Note 4)
DH Gate-Driver Source/Sink
Current
DL Gate-Driver Sink Current
DL Gate-Driver Source Current
Dead Time
VC_LIM
CM+, CM-, CS+, CS-
CM+, CM-, CS+, CS-
VCM+ - VCM- and
VCS+ - VCS-
VCS+ - VCS-
VILIM = 0.5V
VILIM = 1V
VILIM = 0.5V
VILIM = 1V
tLIMIT
VOL(LIMIT)
ILIMIT
Falling edge, 3mV over trip threshold
ISINK = 1mA
LIMIT forced to 5.5V
Rising edge, hysteresis = 20mV, switching
disabled below this level
Rising, hysteresis = 15°C (typ)
RON(DH) VBST - VLX forced to 5V
RON(DL)
High state (pullup)
Low state (pulldown)
MAX1887
MAX1897
MAX1887
MAX1897
MAX1887
MAX1897
IDH
DH forced to 2.5V, VBST - VLX forced to 5V
IDL
DL forced to 2.5V
IDL
DL forced to 2.5V
DL rising
DH rising
-0.2
+2.0
V
-1
+1
µA
47.5 50.0 52.5
mV
97.5 100.0 102.5
-80
-75
-70
mV
-160 -150 -140
0.2
0.3
V
-100
+100 nA
1.5
µs
0.1
V
< 0.01 1.00 µA
3.45
3.85
V
160
°C
1.0
3.5
Ω
1.0
4.5
1.0
3.5
1.0
4.5
Ω
0.4
1.0
0.4
2.0
1.3
A
4.0
A
1.3
A
35
ns
26
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