1 2 V o r Ad ju s t a b le , Hig h -Effic ie n c y,
Lo w I , S t e p -Up DC-DC Co n t ro lle r
Q
MAX71
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, I
= 0mA, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.)
MAX A
LOAD
A
MIN
PARAMETERS
SYMBOL
CONDITIONS
MIN
TYP
MAX
±20
±40
±60
UNITS
MAX1771C
MAX1771E
MAX1771M
FB Input Current
I
FB
nA
SHDN Input High Voltage
SHDN Input Low Voltage
SHDN Input Current
V
V+ = 2.0V to 16.5V
1.6
V
V
IH
V
IL
V+ = 2.0V to 16.5V
0.4
±1
µA
V+ = 16.5V, SHDN = 0V or V+
MAX1771C/E
MAX1771M
85
75
100
100
0.01
55
115
125
±1
Current-Limit Trip Level
V
CS
V+ = 5V to 16V
mV
µA
ns
CS Input Current
EXT Rise Time
EXT Fall Time
V+ = 5V, 1nF from EXT to ground
V+ = 5V, 1nF from EXT to ground
55
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.
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(T = +25°C, unless otherwise noted.)
A
LOAD CURRENT vs.
MINIMUM START-UP INPUT VOLTAGE
EFFICIENCY vs. LOAD CURRENT
(BOOTSTRAPED MODE)
EFFICIENCY vs. LOAD CURRENT
(NON-BOOTSTRAPED MODE)
700
600
100
100
95
V
= 12V, CIRCUIT OF FIGURE 2a
OUT
95
90
V
IN
= 10V
V
IN
=10V
EXTERNAL FET THRESHOLD
LIMITS FULL-LOAD START-UP
BELOW 3.5V
90
V
= 8V
IN
500
400
300
200
V
= 8V
IN
85
80
85
80
V
IN
= 3V
V
= 5V
IN
75
70
75
70
V
= 5V
IN
V
= 12V
V
= 12V
OUT
OUT
CIRCUIT OF
FIGURE 2a
CIRCUIT OF
FIGURE 2b
100
0
65
60
65
60
1
10
1000
10,000
1
10
100
1000
10,000
2.00 2.25 2.50 2.75 3.00 3.25 3.50
MINIMUM START-UP INPUT VOLTAGE (V)
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
