5V/3.3V or Adjustable, High-Efficiency,
Low-Dropout, Step-Down DC-DC Controllers
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 (TA = +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, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
V+ Input Voltage Range
Supply Current
FB Trip Point
FB Input Current
Output Voltage
Reference Voltage
REF Load Regulation
REF Line Regulation
V+
I+
IFB
VOUT
VREF
VOUT < V+
V+ = 16V, SHDN ≤ 0.4V (operating, switch off)
V+ = 16V, SHDN ≥ 1.6V (shutdown)
V+ = 10V, SHDN ≥ 1.6V (shutdown)
MAX1649C, MAX1651C
MAX1649E, MAX1651E
MAX1649C, MAX1651C
MAX1649E, MAX1651E
MAX1649, V+ = 5.5V to 16V
MAX1651, V+ = 3.6V to 16V
MAX1649C, MAX1651C, IREF = 0μA
MAX1649E, MAX1651E, IREF = 0μA
0µA ≤ IREF ≤ 100µA, sourcing only
3V ≤ V+ ≤ 16V
Output Voltage
Line Regulation
Circuit of
Figure 1
MAX1649, 5.5V ≤ V+ ≤ 16V,
ILOAD = 1A
MAX1651, 3.6V ≤ V+ ≤ 16V,
ILOAD = 1A
MIN
3.0
1.470
1.4625
4.80
3.17
1.470
1.4625
TYP
78
2
1
1.5
1.5
5.0
3.3
1.5
1.5
4
40
MAX
16
100
5
1.530
1.5375
±50
±70
5.20
3.43
1.530
1.5375
10
100
UNITS
V
µA
V
nA
V
V
mV
µV/V
2.6
mV/V
1.7
Output Voltage
Load Regulation
Circuit of
Figure 1
MAX1649, 0A ≤ ILOAD ≤ 1.5A,
VIN = 10V
MAX1651, 0A ≤ ILOAD ≤ 1.5A,
VIN = 5V
-47
-45
mV/A
Efficiency
SHDN Input Current
SHDN Input Voltage High
SHDN Input Voltage Low
VIH
VIL
Circuit of
Figure 1
MAX1649, V+ = 10V,
ILOAD = 1A
MAX1651, V+ = 5V,
ILOAD = 1A
V+ = 16V, SHDN = 0V or V+
3V ≤ V+ ≤ 16V
3V ≤ V+ ≤ 16V
90
%
90
1 µA
1.6 V
0.4 V
2 _______________________________________________________________________________________
