MAX1970 查看數據表（PDF） - Maxim Integrated
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MAX1970
Maxim Integrated
MAX1970 Datasheet PDF : 21 Pages
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Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-
Down Regulator with POR and RSI/PFO
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VCC = VEN = 5V, R POR = 100kΩ to IN, RPFO = 100kΩ to IN, VRSI = 0, CREF = 0.1µF, FBSEL1 = unconnected, FBSEL2 =
unconnected, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
COMP1 AND COMP2
COMP1
Transconductance
FB1 = COMP1,
VCOMP1 = 1.2V
FBSEL1 = unconnected
35
55
85
µS
COMP2
Transconductance
LX1 AND LX2
FB2 = COMP2,
VCOMP2 = 1.2V
FBSEL2 = unconnected
35
55
85
µS
Internal High-Side
MOSFET On-Resistance
ILX = -180mA
Internal Low-Side
MOSFET On-Resistance
LX_ Current-Sense
Transresistance
ILX = 180mA
VIN = 5.0V
VIN = 3.3V
VIN =2.6V
VIN = 5.0V
VIN = 3.3V
VIN = 2.6V
0.20
0.32
0.24
0.37
Ω
0.28
0.12
0.23
0.14
0.25
Ω
0.16
0.4
0.5
0.6
V/A
LX_ Current-Limit
Threshold
LX_ Leakage Current
Duty Cycle = 100%,
VIN = 2.6V to 5.5V
VIN = 5.5V
LX_ Switching Frequency VIN = 2.6V to 5.5V
High side
Low side
VLX1 = VLX2 = 5.5V
VLX1 = VLX2 = 0
MAX1970/MAX1972
MAX1971
0.80
1.2
1.60
A
-1.6
-0.85 -0.40
20
µA
-20
1.2
1.4
1.6
MHz
0.60
0.70
0.80
LX_ Maximum Duty Cycle
LX_ Minimum Duty Cycle
POR
VIN = 2.6V to 5.5V
MAX1970/MAX1972
MAX1971
100
%
15
20
%
10
15
POR Thresholds
Percentage of VOUT,
VIN = 2.6V to 5.5V
VOUT rising
VOUT falling
92
94
%
87
90
POR Delay Time (TD)
MAX1970
MAX1971/MAX1972
13.3
16.6
20
ms
140
175
210
POR Output Current, High VPOR = VIN = 5.5V, VFB1 = VFB2 = 1.15V
-1
1
µA
POR Output Voltage, Low
VFB1 = 1.05V or VFB2 = 1.05V or RSI = IN (MAX1971 only),
I POR = 1mA
0.01
0.05
V
POR Startup Voltage
FB1 = FB2 = GND, IPOR = 100µA, VIN = 1.2V
0.01
0.05
V
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