MAX1945R データシートの表示（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
THERMAL SHUTDOWN
Thermal-Shutdown Hysteresis
Thermal-Shutdown Threshold
SYMBOL
CONDITIONS
When LX stops switching
MIN TYP MAX UNITS
20
°C
165
°C
ELECTRICAL CHARACTERISTICS
(VIN = VCC = VCTL1 = VCTL2 = VDD = 3.3V, SYNC = GND, FBSEL = High-Z, VFB = 0.7V, CREF = 0.22µF, TA = -40°C to +85°C, unless
otherwise noted.) (Note 2)
PARAMETER
IN/VCC
Input Voltage
IN Supply Current
VCC Supply Current
VDD Supply Current
Total Shutdown Current from IN,
VCC, and VDD
VCC Undervoltage Lockout
Threshold
VDD
VDD Shutdown Supply Current
BST
BST Shutdown Supply Current
REF
REF Voltage
REF Shutdown Resistance
COMP
COMP Transconductance
COMP Clamp Voltage Low
COMP Clamp Voltage High
COMP Shutdown Resistance
SYMBOL
CONDITIONS
VIN
IIN
ICC
IDD
ITOTAL
VUVLO
SYNC = VCC (1MHz),
no load
VIN = 3.3V
SYNC = VCC (1MHz)
SYNC = VCC (1MHz)
VCC = 3.3V
VDD = 3.3V
VIN = VCC = VDD = VBST - VLX = 5.5V,
CTL1 = CTL2 = GND
When LX starts/stops
switching
VCC rising
VCC falling
IVDD
VIN = VDD = VBST = 5.5V, VLX = 5.5V or 0,
CTL1 = CTL2 = GND
MIN
2.6
2.20
IBST
VIN = VDD = VBST = 5.5V, VLX = 5.5V or 0,
CTL1 = CTL2 = GND
VREF IREF = 0, VIN = 2.6V to 5.5V
1.96
From REF to GND, CTL1 = CTL2 = GND
VLOW_
CLAMP
VHIGH_
CLAMP
From FB to COMP,
VCOMP = 1.25V
FBSEL = High-Z
FBSEL = GND
FBSEL = VCC
VIN = 2.6V to 5.5V, VFB = 0.9V
VIN = 2.6V to 5.5V, VFB = 0.7V
From COMP to GND, CTL1 = CTL2 = GND
30
13.3
9.6
0.5
1.90
TYP
MAX UNITS
5.5
V
20
mA
4
mA
8
mA
500
µA
2.55
V
10
µA
10
µA
2.04
V
100
Ω
85
37.8
µS
27.2
1.1
V
2.40
V
100
Ω
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