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

High-Efficiency, Step-Down DC-DC Controllers

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS

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

Note 2: Specifications from 0°C to -40°C are guaranteed by design, not production tested.

V+ = SHDN = 16.5V (shutdown)

Operating, no load

MAX1627

Circuit of Figure 1,

3/5 = V+

MAX1626,

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

MAX1627, includes hysteresis

CONDITIONS

µA

2

Supply Current into V+

100

V

3.0

16.5

V+

Input Voltage

V

1.25

1.35

Reference

mV

80

120

CS Threshold Voltage

nA

050

FB Leakage Current

V

2.9

Undervoltage Lockout

4.80

5.20

µA

24

50

OUT Input Current

V

1.25

1.35

FB Threshold Voltage

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

Circuit of Figure 1,

3/5 = 0V

V

3.16

3.44

Output Voltage

__________________________________________Typical Operating Characteristics

100

0

0.1m

100m

1

1m

10m

10

EFFICIENCY vs. LOAD CURRENT

20

10

LOAD CURRENT (A)

40

30

60

50

70

80

90

A: V+ = +4.3V

B: V+ = +5V

C: V+ = +8V

D: V+ = +10V

E: V+ = +12V

F: V+ = +15V

CIRCUIT OF FIGURE 1

A

B

C

D E F

100

0

0.1m

100m

1

1m

10m

10

EFFICIENCY vs. LOAD CURRENT

20

10

LOAD CURRENT (A)

40

30

60

50

70

80

90

A: V+ = +6V

B: V+ = +8V

C: V+ = +10V

D: V+ = +12V

E: V+ = +15V

CIRCUIT OF FIGURE 1

A

B

C

D E

0.45

0

0

0.5

1.0

1.5

2.0

2.5

DROPOUT VOLTAGE

vs. LOAD CURRENT

0.05

0.10

0.35

0.25

0.30

0.40

LOAD (A)

0.20

0.15

3.3V SETTING

5V SETTING