Rainbow-electronics MAX1842 Manual do Utilizador descarregar pdf (Página 4)

MAX1742/MAX1842

1A/2.7A, 1MHz, Step-Down Regulators with

Synchronous Rectification and Internal Switches

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

= V

= 3.3V, FBSEL = GND, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.) (Note 3)

Note 2: Recommended operating frequency, not production tested.

Note 3: Specifications from 0°C to -40°C are guaranteed by design, not production tested.

PARAMETER

SYMBOL

CONDITIONS

MIN MAX

UNITS

Input Voltage V

3.0 5.5 V

= 3V to 5.5V,

FBSEL = V

2.475 2.575

FBSEL = unconnected 1.485 1.545

FBSEL = REF

1.782 1.854

Preset Output Voltage V

OUT

LOAD

= 0 to 1A

for MAX1742,

LOAD

= 0 to 2.5A

for MAX1842,

= V

OUT

FBSEL = GND

1.078 1.122

Adjustable Output Voltage

Range

= V

= 3V to 5.5V, I

LOAD

= 0,

FBSEL = GND

REF

Reference Voltage V

REF

1.078

1.122

= 4.5V

200

PMOS Switch

On-Resistance

= 0.5A

= 3V

250

= 4.5V

150

NMOS Switch

On-Resistance

= 0.5A

= 3V

200

mΩ

MAX1742 1.2 1.8

Current-Limit Threshold I

LIMIT

MAX1842 2.9 4.3

MAX1742

0.05

0.55

Idle Mode Current Threshold I

MAX1842 0.2 1.0

No-Load Supply Current

+ I

= 1.2V

600

µA

FB Input Bias Current I

= 1.2V 0

300

Off-Time Default Period t

OFF

TOFF

= 110kΩ

0.85 1.15

µs

1 2 3 4 5 6 7 8 9 ... 15 16

MAX1742/MAX1842 1

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