MAX1774 查看數據表（PDF） - Maxim Integrated
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MAX1774 Datasheet PDF : 21 Pages
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Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
ELECTRICAL CHARACTERISTICS (continued)
(Figure 1, VIN = VINS = +12V, VINC = VCS+ = VCS- = +3.3V, VCORE = +1.8V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
CORE REGULATOR
Input Voltage Range
INC Undervoltage Lockout
Core Output Voltage Adjust
Range
Maximum Core Load Current
FBC Regulation Threshold
FBC Input Current
Dropout Voltage
LXC Leakage Current
LXC P-Channel, N-Channel
On-Resistance
LXC P-Channel Current Limit
LXC P-Channel Minimum
Current
LXC N-Channel Valley Current
LXC N-Channel Zero-Crossing
Current
Max Duty Cycle
Minimum On-Time
Minimum Off-Time
BACKUP REGULATOR
Backup Battery Input Voltage
LXB N-Channel On Resistance
LXB Current Limit
LXB Leakage Current
BIN Leakage Current
BIN, CS- Switch Resistance
BIN Switch Zero-Crossing
Threshold
LXB Maximum On-Time
REFERENCE
Reference Voltage
Reference Load Regulation
Reference Line Regulation
Reference Sink Current
SYMBOL
CONDITIONS
VINC
VINC rising
VINC falling
VFBC
IFBC
ILXC
VCORE = 1.8V (Note 1)
VINC = +2.5 to +5.5V,
IOUTC = 0 to 200mA
VFBC = +1.3V
IOUTC = 400mA
VINC = +5.5V, VLXC = 0 to +5.5V
VBBATT
VCS- = +3.3V, ILXB = 50mA
VLXB = +5.5V, VFBM = +1.3V
IBIN
VBIN = +5.5V, CS- = BKOFF =
SHDNC = SHDNM = GND
VCS- = +3.3V, BKOFF = GND,
SHDNC = CVL
VBIN = +2.5V, BKOFF = SHDNC =
SHDNM = CVL
VREF
IREF = 0 to 50µA
VCS- = +2.5V to +5.5V, IREF = 50µA
MIN
2.6
2.39
2.29
1.0
1
0.97
-0.1
-10
1200
100
880
40
100
160
170
0.9
200
2.8
1.220
10
MAX UNITS
5.5
V
2.55
V
2.45
5.0
V
A
1.03
V
0.1
µA
0.25
V
10
µA
0.5
Ω
3010 mA
420
mA
2450 mA
170
mA
%
700
ns
690
ns
5.5
V
3.5
Ω
600
mA
1
µA
1
µA
15
Ω
35
mV
9.2
µs
1.275
V
10
mV
5
mV
µA
6 _______________________________________________________________________________________
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