12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
MAX1771
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
V+ to GND ...............................................................-0.3V, 17V
EXT, CS, REF, SHDN, FB to GND ...................-0.3V, (V+ + 0.3V)
GND to AGND.............................................................0.1V, -0.1V
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C) .........................471mW
CERDIP (derate 8.00mW/°C above +70°C) .................640mW
Operating Temperature Ranges
MAX1771C_ A .....................................................0°C to +70°C
MAX1771E_ A ..................................................-40°C to +85°C
MAX1771MJA ................................................-55°C to +125°C
Junction Temperatures
MAX1771C_ A/E_ A.......................................................+150°C
MAX1771MJA ..............................................................+175°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 5V, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Minimum Start-Up Voltage
Supply Current
Standby Current
Output Voltage (Note 1)
Output Voltage Line Regulation
(Note 2)
Output Voltage Load Regulation
(Note 2)
Maximum Switch On-Time
Minimum Switch Off-Time
Efficiency
t
ON
(max)
t
OFF
(min)
V+ = 5V, V
OUT
= 12V, I
LOAD
= 500mA,
Circuit of Figure 2a
MAX1771C
Reference Voltage
V
REF
I
REF =
0µA
MAX1771E
MAX1771M
REF Load Regulation
REF Line Regulation
FB Trip Point Voltage
V
FB
0µA
≤
I
REF
≤
100µA
3V
≤
V+
≤
16.5V
MAX1771C
MAX1771E
MAX1771M
1.4700
1.4625
1.4550
MAX1771C/E
MAX1771M
1.4700
1.4625
1.4550
V+ = 16.5V, SHDN = 0V (normal operation)
V+ = 10.0V, SHDN
≥
1.6V (shutdown)
V+ = 16.5V, SHDN
≥
1.6V (shutdown)
V+ = 2.0V to 12.0V, over full load range,
Circuit of Figure 2a
V+ = 5V to 7V, V
OUT
= 12V
I
LOAD
= 700mA, Circuit of Figure 2a
V+ = 6V, V
OUT
= 12V, I
LOAD
= 0mA to
500mA, Circuit of Figure 2a
12
1.8
11.52
SYMBOL
CONDITIONS
MAX1771 (internal feedback resistors)
MAX1771C/E (external resistors)
MAX1771MJA (external resistors)
MIN
2.0
3.0
3.1
1.8
85
2
4
12.0
5
12.48
TYP
MAX
12.5
16.5
16.5
2.0
110
5
V
µA
µA
V
mV/V
V
UNITS
20
16
2.3
92
1.5
1.5
1.5
4
4
40
1.5
1.5
1.5
1.5300
1.5375
1.5450
10
15
100
1.5300
1.5375
1.5450
20
2.8
mV/A
µs
µs
%
V
mV
µV/V
V
2
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
