5V/3.3V or Adjustable, High-Efficiency,

Low-Dropout, Step-Down DC-DC Controllers

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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

±50

nA

±70

Output Voltage

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

1.470

1.5

1.530

V

1.4625

1.5

1.5375

REF Load Regulation

mV

410

CONDITIONS

MAX1649E, MAX1651E

Circuit of

Figure 1

MAX1649C, MAX1651C

V+ = 10V, SHDN

≥ 1.6V (shutdown)

MAX1649C, MAX1651C

MAX1649E, MAX1651E

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)

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

3V

≤ V+ ≤ 16V

REF 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,

MAX1651, 3.6V

≤ V+ ≤ 16V,

-47

mV/A

MAX1649, 0A

MAX1651, 0A

-45

Output Voltage

Load Regulation

Circuit of

Figure 1

90

%

MAX1649, V+ = 10V,

MAX1651, V+ = 5V,

90

Efficiency

Circuit of

Figure 1

SHDN Input Current

V+ = 16V, SHDN = 0V or V+

1

µA

SHDN Input Voltage High

3V

≤ V+ ≤ 16V

1.6

V

SHDN Input Voltage Low

3V

≤ V+ ≤ 16V

0.4

V