MAX1945R Просмотр технического описания (PDF) - Maxim Integrated
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MAX1945R Datasheet PDF : 19 Pages
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1MHz, 1% Accurate, 6A Internal Switch
Step-Down Regulators
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VCC = VCTL1 = VCTL2 = VDD = 3.3V, SYNC = GND, FBSEL = High-Z, VFB = 0.7V, CREF = 0.22µF, TA = 0°C to +85°C, unless
otherwise noted. Typical values are at +25°C.)
PARAMETER
FB
FB Regulation Voltage
(Error Amp Only)
Maximum Output Current
FB Voltage Margining Output
(Error Amp Only)
FB Input Resistance
FB Input Bias Current
LX
LX On-Resistance High
LX On-Resistance Low
LX Current-Sense
Transresistance
LX Current-Limit Threshold
LX Leakage Current
LX Switching Frequency
LX Minimum Off-Time
LX Maximum Duty Cycle
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VFB
VCOMP = 1V to 2V,
VIN = 2.6V to 5.5V
FBSEL = GND 1.782 1.800 1.818
FBSEL = VCC
2.475 2.500 2.525
V
FBSEL = High-Z 0.792 0.800 0.808
IFB_OUT VIN = 3.3V, VOUT = 1.8V, L = 1µH
6
A
MAX1945R,
VCOMP = 1V to 2V,
VIN = 2.6V to 5.5V
VMARGIN_
MAX1945S,
VCOMP = 1V to 2V,
VIN = 2.6V to 5.5V
CTL1 = VCC,
-1
CTL2 = VCC
CTL1 = GND,
3
CTL2 = VCC
CTL1 = VCC,
-5
CTL2 = GND
CTL1 = VCC,
-1
CTL2 = VCC
CTL1 = GND,
8
CTL2 = VCC
CTL1 = VCC,
-10
CTL2 = GND
+1
5
-3
%
+1
10
-8
FB to GND, FBSEL = GND, or VFB = 1.8V,
or FBSEL = VCC, or VFB = 2.5V
FBSEL = High-Z, VFB = 0.7V
25
50
100
kΩ
0.01 0.10
µA
RON_HIGH_ VIN = VBST - VLX = 3.3V
LX
VIN = VBST - VLX = 2.6V
RON_LOW_ VIN = 3.3V
LX
VIN = 2.6V
From LX to COMP
ILEAK_LX
Duty cycle =100%,
VIN = 2.6V/3.3V/5.5V
VIN = 5.5V,
CTL1 = CTL2 = GND
fSW
VIN = 2.6V/3.3V
tOFF VIN = 2.6V/3.3V
VIN = 2.6V/3.3V
26
43
mΩ
30
50
26
43
mΩ
30
50
43
54
65
mΩ
High side
Low side
8.0 10.4 12.8
A
-6
-4
-2
VLX = 5.5V
LX = GND
-100
100
µA
SYNC = VCC
0.8
1.0
1.2
MHz
SYNC = GND 400 500
600
kHz
155 180
ns
SYNC = GND 90
%
SYNC = VCC
80
_______________________________________________________________________________________ 3
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