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
LX Minimum Duty Cycle
RMS LX Output Current
FBSEL
FBSEL Input Threshold 1.8V
SYMBOL
CONDITIONS
VIN = 2.6V/3.3V
SYNC = GND
SYNC = VCC
Where 1.8V feedback
switches in and out,
VCC = 2.6V/3.3V/5.5V
FBSEL rising
FBSEL falling
FBSEL Input Threshold 2.5V
Where 2.5V feedback
switches in and out,
VCC = 2.6V/3.3V/5.5V
FBSEL rising
FBSEL falling
FBSEL Input Current Low
ILOW_
FBSEL
FBSEL = GND
FBSEL Input Current High
IHIGH_
FBSEL
FBSEL = VCC
CTL1 /CTL2
CTL1/CTL2 Input Threshold
CTL1/CTL2 Input Current
Soft-Start Period
VIL_CTL_
VIH_CTL_
IIL_CTL_
IIH_CTL_
VIN = 2.6V to 5.5V
VCTL1 or VCTL2 = 0 or 5.5V, VIN = 5.5V
Time required for output to ramp up
Time from Nominal to Margin
High
Time from Nominal to Margin Low
SYNC
tHIGH_4%
tHIGH_9%
tLOW_4%
tLOW_9%
+4%
+9%
-4%
-9%
SYNC Capture Range
SYNC Pulse Width
SYNC Input Threshold
SYNC Input Current
SYNCOUT
SYNCOUT Frequency Range
tLO, tHI
VIL_SYNC
VIH_SYNC
IIL, IIH
VIN = 2.6V to 5.5V
VIN = 2.6V to 5.5V
VIN = 2.6V to 5.5V
VSYNC = 0 or 5.5V, VIN = 5.5V
fSYNCOUT VCC = 2.6V to 5.5V
SYNCOUT Output Voltage
VOH_SYNC
OUT
VOL_SYNC
OUT
ISYNCOUT = ±1mA, VCC = 2.6V to 5.5V
MIN
0.08
VCC -
0.22
-50
0.4
-1
-1
2.9
0.4
250
0.40
-1
0.4
VCC -
0.4
TYP
8.8
17.6
0.16
0.14
VCC -
0.14
VCC -
0.16
-20
20
0.95
1.0
3.7
160
360
450
1000
0.95
1.0
VCC -
0.05
0.05
MAX
10.5
6
0.22
VCC -
0.08
50
1.6
+1
+1
4.5
1.2
1.6
+1
1.2
0.40
UNITS
%
A
V
V
µA
µA
V
µA
ms
µs
µs
MHz
ns
V
µA
MHz
V
4 _______________________________________________________________________________________
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