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 = -40°C to +85°C, unless otherwise noted.) (Note 5)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Shutdown Supply Current (VCC)
(MAX1897, Note 3)
Measured at VCC; SHDN = GND
5
µA
CURRENT SENSING
On-Time Adjustment Range
0.42 < VCOMP < 2.8V, VOUT ≥ 0.7V
-40
+40
%
COMP Output Current
ICOMP Sink and source
30
µA
Current-Balance Offset
(VCM+ - VCM-) -
MAX1887
-2.0
(VCS+ - VCS-), ICOMP = 0,
-100mV ≤ (VCM+ - VCM-)
≤ +100mV
MAX1897
-2.0
+2.0
mV
+2.0
Current-Sense, Common-Mode
Range
CM+, CM-, CS+, CS-
-0.2
+2.0
V
Positive Current-Limit Threshold
Negative Current-Limit
Threshold
ILIM Standby Threshold Voltage
FAULT PROTECTION
VC_LIM
VCM+ - VCM- and
VCS+ - VCS-
VCS+ - VCS-
VILIM = 0.5V
VILIM = 1V
VILIM = 0.5V
VILIM = 1V
47.5
97.5
-80
-160
0.2
52.5
mV
102.5
-70
mV
-140
0.3
V
VCC/VDD Undervoltage Lockout
Threshold (Note 3)
Rising edge, hysteresis = 20mV, switching
disabled below this level
3.45
3.85
V
GATE DRIVERS
DH Gate-Driver On-Resistance
(Note 4)
DL Gate-Driver On-Resistance
(Note 4)
LOGIC
TRIG Logic Levels
TON Logic Levels (MAX1897)
RON(DH)
VBST - VLX forced to
5V
RON(DL)
High state (pullup)
Low state (pulldown)
MAX1887
MAX1897
MAX1887
MAX1897
MAX1887
MAX1897
VTRIG
VTON
350mV hysteresis
High
Low
Logic high (VCC; 200kHz operation)
Open (300kHz operation)
Logic low (GND; 550kHz operation)
3.0
VCC - 0.4
1.5
3.5
Ω
4.5
3.5
4.5
Ω
1.0
2.0
V
1.2
3.1
V
0.5
Note 1: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = PGND, VBST = 5V, and a
500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be different due to
MOSFET switching speeds.
Note 2: The trigger delay time, tTRIG, is measured from the time the TRIG pin transitions to time when the DL pin goes low.
Note 3: The 20-pin MAX1897 has a separate analog PWM supply voltage input (VCC) and gate-driver supply input (VDD). For the 16-pin
MAX1887 device, the analog PWM supply voltage input and the gate-driver supply voltage input are internally connected and
named VDD.
Note 4: Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the MAX1897’s
QFN package. The MAX1887 and MAX1897 contain the same die, and the QFN package imposes no additional resistance in-
circuit.
Note 5: Specifications to -40°C are guaranteed by design and not production tested.
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