MAX1649/MAX1651
5V/3.3V or Adjustable, High-Efficiency,
Low-Dropout, Step-Down DC-DC Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°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.
PARAMETER SYMBOL MIN TYP MAX UNITS
1.4625 1.5 1.5375
FB Trip Point
1.470 1.5 1.530
V
I+
15
FB Input Current I
FB
±50
nA
±70
Output Voltage V
OUT
4.80 5.0 5.20
V
Supply Current
V+ Input Voltage Range V+ 3.0 16 V
78 100
µA
2
3.17 3.3 3.43
Reference Voltage V
REF
1.470 1.5 1.530
V
1.4625 1.5 1.5375
REF Load Regulation mV410
CONDITIONS
MAX1649E, MAX1651E
Circuit of
Figure 1
MAX1649C, MAX1651C
V+ = 10V, SHDN ≥ 1.6V (shutdown)
MAX1649C, MAX1651C
MAX1649C, MAX1651C, I
REF
= 0µA
MAX1649E, MAX1651E
MAX1649E, MAX1651E, I
REF
= 0µA
V
OUT
< V+
V+ = 16V, SHDN ≤ 0.4V (operating, switch off)
V+ = 16V, SHDN ≥ 1.6V (shutdown)
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
MAX1649, V+ = 5.5V to 16V
MAX1651, V+ = 3.6V to 16V
0µA ≤ I
REF
≤ 100µA, sourcing only
3V ≤ V+ ≤ 16VREF Line Regulation 40 100 µV/V
2.6
mV/V
1.7
Output Voltage
Line Regulation
Circuit of
Figure 1
MAX1649, 5.5V ≤ V+ ≤ 16V,
I
LOAD
= 1A
MAX1651, 3.6V ≤ V+ ≤ 16V,
I
LOAD
= 1A
-47
mV/A
MAX1649, 0A ≤ I
LOAD
≤ 1.5A,
V
IN
= 10V
MAX1651, 0A ≤ I
LOAD
≤ 1.5A,
V
IN
= 5V
-45
Output Voltage
Load Regulation
Circuit of
Figure 1
90
%
MAX1649, V+ = 10V,
I
LOAD
= 1A
MAX1651, V+ = 5V,
I
LOAD
= 1A
90
Efficiency
Circuit of
Figure 1
SHDN Input Current V+ = 16V, SHDN = 0V or V+ 1 µA
SHDN Input Voltage High V
IH
3V ≤ V+ ≤ 16V 1.6 V
SHDN Input Voltage Low V
IL
3V ≤ V+ ≤ 16V 0.4 V
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