5V, Step-Down,

Current-Mode PWM DC-DC Converters

_______________________________________________________________________________________

3

Note 1: The standby current typically settles to 25µA (over temperature) within 2 seconds; however, to decrease test time, the part

is guaranteed at a 100µA maximum value.

ELECTRICAL CHARACTERISTICS (continued)

unless otherwise noted.)

PARAMETER

MAX730A

MIN

TYP

MAX

Supply Current

(includes switch

current)

UNITS

MAX738A

MIN

TYP

MAX

4.3

mA

MAX744AE

6.0

100.0

6.0

100.0

6.0

100.0

µA

Standby Current

0.0005

LX On Resistance

2.0

2.0

2.0

MAX744AC/AE

0.5

MAX744A

MIN

TYP

MAX

0.25

0.25

0.25

V

0.5

0.0005

Shutdown Input

Threshold

%/mA

Shutdown Input

Leakage Current

Load Regulation

0.0005

SHDN = 0V (Note 1)

0.5

1.7

3.0

1.7

3.0

1.7

3.0

159.0 185.0 212.5

Ω

MAX744AC/AE

1.2

2.5

V+ = 12V, LX = 0V

MAX744AM

1.0

3.0

1.0

1.0

V+ = 6.0V

to 9.0V

MAX744AC/AE

3.0

1.0

µA

Reference Drift

1.0

1.0

MAX744AM

µA

3.5

1.5

MAX744AM

V+ = 9.0V

to 12.0V

MAX744AC

4.0

50

50

LX Leakage Current

1.5

87

1.5

CONDITIONS

A

Short-Circuit Current

V+ rising

159.0

216.5

5.7

6.0

5.7

6.0

4.7

5.2

V+ falling

5.0

5.7

V

kHz

Undervoltage

Lockout

90

87

90

%

Efficiency

92

V+ = 6.0V

to 16.0V

Reference Voltage

1.15

1.23

1.30

1.15

1.23

1.30

1.15

1.23

1.30

V

50

130

160

190

130

170

210

ppm/°C

Oscillator Frequency

7500

7500

7500

Ω

Compensation Pin

Impedance

4.5

V+ = 12.0V

to 16.0V

MAX744AM