MAX1875-MAX1876 查看數據表（PDF） - Maxim Integrated
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MAX1875-MAX1876 Datasheet PDF : 21 Pages
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Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 12V, EN = ILIM_ = VL, SYNC = GND, IVL = 0mA, PGND = GND, CREF = 0.22µF, CVL = 4.7µF (ceramic), ROSC = 60kΩ,
compensation components for COMP_ are from Figure 1, TA = -40°C to +85°C (Note 1), unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SYNC Range
Internal oscillator nominal frequency must be set to half
of the SYNC frequency
200
1200 kHz
SYNC Input Pulse Width
(Note 3)
High
Low
SYNC Rise/Fall Time
(Note 3)
ERROR AMPLIFIER
FB_ Input Bias Current
FB_ Input Voltage Set Point
0°C to +85°C
-40°C to +85°C
0°C to +85°C
FB_ to COMP_ Transconductance
-40°C to +85°C
DRIVERS
DL_, DH_ Break-Before-Make Time CLOAD = 5nF
DH_ On-Resistance
Low
High
DL_ On-Resistance
Low
High
LOGIC INPUTS (EN, SYNC)
Input Low Level
Typical 15% hysteresis, VL = 4.75V
Input High Level
Input High/Low Bias Current
VL = 5.5V
VEN = 0 or 5.5V
LOGIC OUTPUTS (CKO)
Output Low Level
Output High Level
VL = 5V, sinking 5mA
VL = 5V, sourcing 5mA
COMP_
100
ns
100
100
ns
250
nA
0.985 1.00 1.015
V
0.98 1.00 1.02
1.25
1.8
2.70
mS
1.2
1.8
2.9
30
ns
1.5
2.5
Ω
3
5
0.6
1.5
Ω
3
5
0.8
V
2.4
V
-1
0.1
+1
µA
0.4
V
4.0
V
Pulldown Resistance During
Shutdown and Current Limit
17
Ω
RST OUTPUT (MAX1876 ONLY)
Output-Voltage Trip Level
Both FBs must be over this to allow the reset timer to
start; there is no hysteresis
0.87
0.9
0.93
V
Output Low Level
Output Leakage
Reset Timeout Period
FB_ to Reset Delay
VL = 5V, sinking 3.2mA
VL = 1V, sinking 0.4mA
V+ = VL = 5V, V RST = 5.5V, VFB = 1V
VFB_ = 1V
FB_ overdrive from 1V to 0.85V
0.4
V
0.3
1
µA
140
315
560
ms
4
µs
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: Operating supply range is guaranteed by VL line regulation test. Connect V+ to VL for 5V operation.
Note 3: Guaranteed by design and not production tested.
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