5V/3.3V or Adjustable, 100% Duty-Cycle,

High-Efficiency, Step-Down DC-DC Controllers

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +3V to +16.5V, SHDN =

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.

Supply Voltage, V+ to GND.......................................-0.3V, +17V

OUT, FB,

3/5, SHDN, REF, CS, EXT to GND ...-0.3V, (V+ + 0.3V)

SO (derate 5.88mW/°C above +70°C) ..........................471mW

Operating Temperature Range

MAX1626ESA/MAX1627ESA ............................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

0µA

V+ = SHDN = 16.5V (shutdown)

Operating, no load

Output in regulation

Output forced to 0V

V+ = 5V

3/5 = 0V or V+

MAX1627

Circuit of Figure 1,

3/5 = V+ (Note 1)

MAX1626,

3/5 = V+, output forced to 5V

SHDN = 0V or V+

MAX1627, includes hysteresis

CONDITIONS

mV

410

REF Load Regulation

V

1.27

1.30

1.33

Reference Voltage

mV/A

15

Load Regulation

mV/V

5

Line Regulation

%

100

EXT Duty-Cycle Limit

µs

1.5

2.0

2.5

810

12

Minimum EXT Off Time

Ω

10

EXT Resistance

µA

±1

3/5 Leakage Current

V

0.5

3/5 Input Voltage Low

V

V+ - 0.5

3/5 Input Voltage High

µA

±1

SHDN Input Current

V

0.4

SHDN Input Voltage Low

µA

1

I+

Supply Current into V+

70

90

V

3.0

16.5

V+

Input Voltage Range

V

1.6

SHDN Input Voltage High

mV

85

100

115

CS Threshold Voltage

µA

010

CS Input Current

nA

035

FB Leakage Current

V

2.7

2.8

Undervoltage Lockout

4.85

5.00

5.15

µA

24

37

50

OUT Input Current

V

1.27

1.30

1.33

FB Threshold Voltage

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

µV/V

10

100

REF Line Regulation

Circuit of Figure 1,

3/5 = 0V (Note 1)

V

3.20

3.30

3.40

Output Voltage