MAX669 데이터 시트보기 (PDF) - Maxim Integrated
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MAX669 Datasheet PDF : 18 Pages
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1.8V to 28V Input, PWM Step-Up
Controllers in µMAX
ELECTRICAL CHARACTERISTICS (continued)
(VCC = VLDO = +5V, ROSC = 200kΩ, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX
ROSC = 200kΩ ±1%
87
90
93
Maximum Duty Cycle
ROSC = 100kΩ ±1%
86
90
94
ROSC = 500kΩ ±1%
86
90
94
Minimum EXT Pulse Width
290
Minimum SYNC Input-Pulse Duty Cycle
20
45
Minimum SYNC Input Low Pulse Width
50
200
SYNC Input Rise/Fall Time
Not tested
200
SYNC Input Frequency Range
100
500
SYNC/SHDN Falling Edge to Shutdown Delay
70
SYNC/SHDN Input High Voltage
SYNC/SHDN Input Low Voltage
3.0V < VCC < 28V
1.8V < VCC < 3.0V (MAX669)
3.0V < VCC < 28V
1.8V < VCC < 3.0V (MAX669)
2.0
1.5
0.45
0.30
SYNC/SHDN Input Current
VSYNC/SHDN = 5V
VSYNC/SHDN = 28V
0.5
3.0
1.5
6.5
EXT Sink/Source Current
EXT forced to 2V
1
EXT On-Resistance
EXT high or low
2
5
UNITS
%
ns
%
ns
ns
kHz
µs
V
V
µA
A
Ω
ELECTRICAL CHARACTERISTICS
(VCC = VLDO = +5V, ROSC = 200kΩ, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
PPWWMMCCoOnNtrToRllOerLLER
MAX668
3
Input Voltage Range, VCC
MAX669
1.8
Input Voltage Range with VCC Tied to LDO
2.7
FB Threshold
1.22
FB Input Current
VFB = 1.30V
Current-Limit Threshold
85
Idle Mode Current-Sense Threshold
3
CS+ Input Current
CS+ forced to GND
VCC Supply Current (Note 1)
Shutdown Supply Current (VCC)
ReEfFeEreRnEcNeCaEndALNDDOLDROegRuElaGtoUrLsATORS
VFB = 1.30V, VCC = 3V to 28V
SYNC/SHDN = GND, VCC = 28V
LDO Output Voltage
LDO load =
5V ≤ VCC ≤ 28V
(includes LDO dropout)
4.50
∞ to 400Ω
3V ≤ VCC ≤ 28V
(includes LDO dropout)
2.65
LDO Undervoltage Lockout Threshold
Sensed at LDO, falling edge,
hysteresis = 1%, MAX669 only
2.40
MAX UNITS
28
V
28
5.5
V
1.28
V
20
nA
115
mV
27
mV
1
µA
350
µA
6
µA
5.50
V
5.50
V
2.60
V
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