MAX770CSA View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX770CSA
Maxim Integrated
MAX770CSA Datasheet PDF : 20 Pages
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5V/12V/15V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controllers
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX770
EFFICIENCY vs. OUTPUT CURRENT
(BOOTSTRAPPED)
100
90
VIN = 4V
MAX771
EFFICIENCY vs. OUTPUT CURRENT
(BOOTSTRAPPED)
100
VIN = 9V VIN = 6V
90
MAX772
EFFICIENCY vs. OUTPUT CURRENT
(BOOTSTRAPPED)
100
VOUT = 15V, CIRCUIT OF FIGURE 2b
MAX772 SUBSTITUTED FOR MAX771
90
80
80
80
70
60
50
0.001
VIN = 3.5V
VIN = 3V
VOUT = 5V
CIRCUIT OF
FIGURE 2a
0.01
0.1
1
OUTPUT CURRENT (A)
MAX771
EFFICIENCY vs. OUTPUT CURRENT
(NON-BOOTSTRAPPED)
100
VOUT = 12V
CIRCUIT OF
FIGURE 2c
VIN = 9V
90
VIN = 6V
VIN = 5V
80
70
0.001 0.01
0.1
1
10
OUTPUT CURRENT (A)
70
60
50
0.001
VIN = 5V
VIN = 3V
VOUT = 12V
CIRCUIT OF
FIGURE 2b
0.01
0.1
1
OUTPUT CURRENT (A)
MAX770
LOAD CURRENT vs.
MINIMUM START-UP INPUT VOLTAGE
700
600
VOUT = 5V
CIRCUIT OF
FIGURE 2a
500
400
300
ABOVE 3.4V,
200
THE CIRCUIT
STARTS UP
UNDER
100
MAXIMUM
LOAD
CONDITIONS
0
1.0 1.5 2.0 2.5 3.0 3.5
MINIMUM START-UP INPUT VOLTAGE (V)
70
VIN = 12V
VIN = 9V
60
VIN = 6V
VIN = 5V
VIN = 3V
50
0.001
0.01
0.1
1
OUTPUT CURRENT (A)
MAX771
LOAD CURRENT vs.
MINIMUM START-UP INPUT VOLTAGE
500
VOUT = 12V
CIRCUIT OF
400 FIGURE 2b
300
200
ABOVE 3.5V
THE CIRCUIT
STARTS UP
100
UNDER
MAXIMUM
LOAD
CONDITIONS
0
2.0
2.5
3.0
3.5
4.0
MINIMUM START-UP INPUT VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
4
VOUT = 12V, VIN = 5V
CIRCUIT OF FIGURE 2b
BOOTSTRAPPED MODE
3
ENTIRE
CIRCUIT
2
1
SCHOTTKY DIODE
LEAKAGE EXCLUDED
0
-75 -50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
0.8
VOUT = 12V
0.6
BOOTSTRAPPED
CIRCUIT OF
FIGURE 2b
0.4
0.2
NON-BOOTSTRAPPED
CIRCUIT OF FIGURE 2c
0
2
4
6
8
10
12
SUPPLY VOLTAGE (V)
EXT RISE/FALL TIME vs. SUPPLY VOLTAGE
250
200
CEXT = 2200pF
CEXT = 1000pF
150
CEXT = 446pF
CEXT = 100pF
100
50
0
2
4
6
8
V+ (V)
10
12
4 _______________________________________________________________________________________
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