5V/3.3V or Adjustable, High-Efficiency,
Low-Dropout, Step-Down DC-DC Controllers
MAX1649/MAX1651
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to GND.......................................-0.3V, +17V
REF, SHDN, FB, CS, EXT, OUT .......................-0.3V, (V+ + 0.3V)
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
Operating Temperature Ranges
MAX1649C_A, MAX1651C_A ..............................0°C to +70°C
MAX1649E_A, MAX1651E_A ............................-40°C to +85°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, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
V+ Input Voltage Range
Supply Current
SYMBOL
V+
I+
V
OUT
< V+
V+ = 16V, SHDN
≤
0.4V (operating, switch off)
V+ = 16V, SHDN
≥
1.6V (shutdown)
V+ = 10V, SHDN
≥
1.6V (shutdown)
FB Trip Point
FB Input Current
Output Voltage
Reference Voltage
REF Load Regulation
REF Line Regulation
I
FB
V
OUT
V
REF
MAX1649C, MAX1651C
MAX1649E, MAX1651E
MAX1649C, MAX1651C
MAX1649E, MAX1651E
Circuit of
Figure 1
MAX1649, V+ = 5.5V to 16V
MAX1651, V+ = 3.6V to 16V
4.80
3.17
1.470
1.4625
5.0
3.3
1.5
1.5
4
40
MAX1649, 5.5V
≤
V+
≤
16V,
I
LOAD
= 1A
MAX1651, 3.6V
≤
V+
≤
16V,
I
LOAD
= 1A
MAX1649, 0A
≤
I
LOAD
≤
1.5A,
V
IN
= 10V
MAX1651, 0A
≤
I
LOAD
≤
1.5A,
V
IN
= 5V
MAX1649, V+ = 10V,
I
LOAD
= 1A
MAX1651, V+ = 5V,
I
LOAD
= 1A
1.6
0.4
2.6
mV/V
1.7
-47
mV/A
-45
90
%
90
1
µA
V
V
1.470
1.4625
CONDITIONS
MIN
3.0
78
2
1
1.5
1.5
5
1.530
1.5375
±50
±70
5.20
3.43
1.530
1.5375
10
100
V
nA
V
V
mV
µV/V
TYP
MAX
16
100
µA
UNITS
V
MAX1649C, MAX1651C, I
REF
= 0µA
MAX1649E, MAX1651E, I
REF
= 0µA
0µA
≤
I
REF
≤
100µA, sourcing only
3V
≤
V+
≤
16V
Circuit of
Figure 1
Output Voltage
Line Regulation
Output Voltage
Load Regulation
Circuit of
Figure 1
Efficiency
Circuit of
Figure 1
SHDN Input Current
SHDN Input Voltage High
SHDN Input Voltage Low
V
IH
V
IL
V+ = 16V, SHDN = 0V or V+
3V
≤
V+
≤
16V
3V
≤
V+
≤
16V
2
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
