MAX1771 Maxim, MAX1771 Datasheet - Page 3

• Manufacturer Part Number: MAX1771
• Description: 12V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controller
• Manufacturer: Maxim

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ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, I
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
(T
FB Input Current
SHDN Input High Voltage
SHDN Input Low Voltage
SHDN Input Current
Current-Limit Trip Level
CS Input Current
EXT Rise Time
EXT Fall Time
A
= +25°C, unless otherwise noted.)
100
60
95
90
85
80
75
70
65
PARAMETERS
1
V
LOAD
EFFICIENCY vs. LOAD CURRENT
IN
V
= 10V
IN
(BOOTSTRAPED MODE)
10
= 5V
LOAD CURRENT (mA)
= 0mA, T
_______________________________________________________________________________________
100
V
A
IN
= T
= 3V
1000
MIN
V
V
CIRCUIT OF
FIGURE 2a
IN
OUT
= 8V
to T
SYMBOL
= 12V
12V or Adjustable, High-Efficiency,
10,000
V
V
I
V
MAX
FB
CS
Low I
IH
IL
, unless otherwise noted. Typical values are at T
MAX1771C
MAX1771E
MAX1771M
V+ = 2.0V to 16.5V
V+ = 2.0V to 16.5V
V+ = 16.5V, SHDN = 0V or V+
V+ = 5V to 16V
V+ = 5V, 1nF from EXT to ground
V+ = 5V, 1nF from EXT to ground
100
60
95
90
85
80
75
70
65
1
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Q
V
EFFICIENCY vs. LOAD CURRENT
IN
V
(NON-BOOTSTRAPED MODE)
=10V
IN
, Step-Up DC-DC Controller
10
= 5V
LOAD CURRENT (mA)
CONDITIONS
100
MAX1771C/E
MAX1771M
1000
V
CIRCUIT OF
FIGURE 2b
OUT
V
IN
= 12V
= 8V
10,000
A
= +25°C.)
700
600
500
400
300
200
100
0
MIN
2.00
1.6
85
75
MINIMUM START-UP INPUT VOLTAGE
MINIMUM START-UP INPUT VOLTAGE (V)
V
EXTERNAL FET THRESHOLD
LIMITS FULL-LOAD START-UP
BELOW 3.5V
OUT
2.25
= 12V, CIRCUIT OF FIGURE 2a
TYP
0.01
100
100
LOAD CURRENT vs.
55
55
2.50
2.75
MAX
±20
±40
±60
115
125
0.4
±1
±1
3.00
3.25
UNITS
mV
nA
ns
ns
V
V
A
A
3.50
3