MAX8643 查看數據表（PDF） - Maxim Integrated
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MAX8643 Datasheet PDF : 16 Pages
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3A, 2MHz Step-Down Regulator
with Integrated Switches
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VDD = 3.3V, VFB = 0.5V, TA = -40°C to +85°C. Typical values are at TA = +25°C, circuit of Figure 1, unless otherwise noted.) (Note 2)
PARAMETER
Open-Loop Voltage Gain
Error-Amplifier Unity-Gain
Bandwidth
Error-Amplifier Common-Mode
Input Range
Error-Amplifier Minimum Output
Current
FB Input Bias Current
CTL_
CTL_ Input Bias Current
High-Impedance Threshold
Hysteresis
REFIN
REFIN Input Bias Current
REFIN Common-Mode Range
REFIN Offset Voltage
LX (ALL PINS COMBINED)
LX On-Resistance, High Side
LX On-Resistance, Low Side
LX Current-Limit Threshold
LX Leakage Current
LX Switching Frequency
Frequency Range
LX Minimum Off-Time
LX Maximum Duty Cycle
LX Minimum On-Time
RMS LX Output Current
CONDITIONS
1kΩ from COMP to GND
Parallel 10kΩ, 40pF from COMP to GND (Note 3)
VDD = 2.35V to 2.6V
VDD = 2.6V to 3.6V
VCOMP = 1V
VFB = 0.7V, CTL1 = CTL2 =
Sourcing
Sinking
TA = +25°C
MIN
14
0
0
1000
-500
-200
VCTL_ = 0V
VCTL_ = VDD
Rising
Falling
All VID transitions
VDD
- 1.2V
VREFIN = 0.6V
TA = +25°C
VDD = 2.3V to 2.6V
VDD = 2.6V to 3.6V
CTL1 = CTL2 = GND, TA = +25°C
-500
0
0
-3
ILX = -2A
VIN = VBST - VLX = 2.5V
VIN = VBST - VLX = 3.3V
ILX = 2A
VIN = 2.5V
VIN = 3.3V
VIN = 2.5V, high-side sourcing
4
VIN = 3.6V, VEN = VSS = 0V
TA = +25°C
VLX = 0V
VLX = 3.6V
-2
TA = +85°C VLX = 0V
VLX = 3.6V
VIN = 2.5V to 3.3V
RFREQ = 50kΩ
0.9
RFREQ = 23.2kΩ
1.8
500
VIN = 2.5V to 3.3V
RFREQ = 50kΩ, VIN = 2.5V to 3.3V
93
3
TYP MAX UNITS
115
dB
26
MHz
VDD - 1.65
V
VDD - 1.7
µA
-40
nA
-7
µA
+7
0.75
V
50
mV
-100
nA
VDD - 1.65
V
VDD - 1.7
+3
mV
39
mΩ
37
58
36
mΩ
34
55
5.5
A
+2
µA
1
1
1
1.1
MHz
2.0
2.2
2000 kHz
40
75
ns
96
%
80
ns
A
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