MAX1775 查看數據表（PDF） - Maxim Integrated
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MAX1775 Datasheet PDF : 15 Pages
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Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +12V, VMAIN = VINC = VCS- = VCS+ = +3.3V, VCORE = +1.8V, Circuit of Figure 4, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
CORE REGULATOR
Input Voltage Range
INC Undervoltage Lockout
VINC
VINC rising
VINC falling
2.6
5.5
V
2.40 2.47 2.55
V
2.30 2.37 2.45
Core Output Voltage Adjust
Range
1.0
5.0
V
Maximum Core Load Current
FBC Regulation Threshold
FBC Input Current
Dropout Voltage (INC to LXC)
LXC Leakage Current
LXC P-Channel, N-Channel
On-Resistance
VFBC
IFBC
ILXC
(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
1
1.5
A
0.97 1.0 1.03
V
-0.1
0.1
µA
0.1 0.25
V
-10
10
µA
0.25
0.5
Ω
LXC P-Channel Current Limit
LXC P-Channel Minimum
Current
ICLC
1200 1800 3000 mA
100
200
400
mA
LXC N-Channel Valley Current
900 1400 2400 mA
LXC N-Channel Zero-Crossing
Current
40
110
170
mA
LXC Dead Time
Maximum Duty Cycle
Minimum On-Time
Minimum Off-Time
REFERENCE
Reference Voltage
Reference Load Regulation
Reference Line Regulation
Reference Sink Current
CVL, CVH REGULATORS
CVL Output Voltage
CVL Switchover Threshold
CVH Output Voltage
CVH Switchover Threshold
CVL Undervoltage Lockout
VREF
IREF
IREF = 0 to 50µA
VCS- = +2.5V to +5.5V, IREF = 50µA
VCVL
VCVH
VIN
ICVL = 50mA, VIN = +2.7V, VCS- = 0
ICVL = 50mA, VCS- = +3.3V
VCS- rising, hysteresis = 100mV (typ)
VIN = +4V, ICVH = 25mA
VIN = +12V, ICVH = 50mA
VIN rising, hysteresis = 350mV (typ)
VCVL rising
VCVL falling
50
ns
100
%
170
400
670
ns
170
400
670
ns
1.23 1.25 1.27
V
10
mV
5
mV
10
µA
2.6
2.8
3.1
V
3.2
2.40 2.47 2.55
V
VIN - 3.4 VIN - 2.8 V
VIN - 4.3 VIN - 3.7
5.5
V
2.40 2.47 2.55
V
2.30 2.37 2.45
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