MAX1771 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1771 Datasheet PDF : 16 Pages
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12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERS
SYMBOL
CONDITIONS
MIN TYP
MAX1771C
FB Input Current
IFB
MAX1771E
MAX1771M
SHDN Input High Voltage
VIH
V+ = 2.0V to 16.5V
1.6
SHDN Input Low Voltage
VIL
V+ = 2.0V to 16.5V
SHDN Input Current
V+ = 16.5V, SHDN = 0V or V+
Current-Limit Trip Level
VCS
V+ = 5V to 16V
MAX1771C/E
MAX1771M
85
100
75
100
CS Input Current
0.01
EXT Rise Time
V+ = 5V, 1nF from EXT to ground
55
EXT Fall Time
V+ = 5V, 1nF from EXT to ground
55
MAX
±20
±40
±60
0.4
±1
115
125
±1
UNITS
nA
V
V
µA
mV
µA
ns
ns
Note 1: Output voltage guaranteed using preset voltages. See Figures 4a–4d for output current capability versus input voltage.
Note 2: Output voltage line and load regulation depend on external circuit components.
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(BOOTSTRAPED MODE)
100
95 VIN = 10V
90
VIN = 8V
85
80
VIN = 3V
75
70
65
60
1
VIN = 5V
VOUT = 12V
CIRCUIT OF
FIGURE 2a
10
100
1000
LOAD CURRENT (mA)
10,000
EFFICIENCY vs. LOAD CURRENT
(NON-BOOTSTRAPED MODE)
100
95 VIN =10V
90
85
VIN = 8V
80
VIN = 5V
75
70
65
60
1
VOUT = 12V
CIRCUIT OF
FIGURE 2b
10
100
1000
LOAD CURRENT (mA)
10,000
LOAD CURRENT vs.
MINIMUM START-UP INPUT VOLTAGE
700
600 VOUT = 12V, CIRCUIT OF FIGURE 2a
EXTERNAL FET THRESHOLD
LIMITS FULL-LOAD START-UP
500 BELOW 3.5V
400
300
200
100
0
2.00 2.25 2.50 2.75 3.00 3.25 3.50
MINIMUM START-UP INPUT VOLTAGE (V)
_______________________________________________________________________________________ 3
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