MAX1742 查看數據表（PDF） - Maxim Integrated

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MAX1742

1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches

Maxim Integrated 

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

Synchronous Rectification and Internal Switches

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VCC = 3.3V, FBSEL = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP

Current-Limit Threshold

ILIMIT

MAX1742

MAX1842

1.3

1.5

3.1

3.6

RMS LX Output Current

Idle Mode Current Threshold

MAX1742

IIM

MAX1842

0.1

0.3

0.3

0.6

Switching Frequency

f

(Note 2)

No-Load Supply Current

IIN + ICC VFB = 1.2V

350

Shutdown Supply Current

ICC(SHDN) SHDN = GND

<1

PMOS Switch Off-Leakage

Current

IIN

SHDN = GND

MAX

1.7

4.1

3.1

0.5

0.9

1

600

5

15

Thermal Shutdown Threshold

Undervoltage Lockout Threshold

FB Input Bias Current

Off-Time Default Period

Off-Time Startup Period

On-Time Period

SS Source Current

SS Sink Current

SHDN Input Current

SHDN Input Low Threshold

SHDN Input High Threshold

FBSEL Input Current

TSHDN

VUVLO

IFB

tOFF

tOFF

tON

ISS

ISS

I SHDN

VIL

VIH

Hysteresis = 15°C

VIN falling, hysteresis = 90mV

VFB = 1.2V

RTOFF = 110kΩ

RTOFF = 30.1kΩ

RTOFF = 499kΩ

FB = GND

(Note 2)

VSS = 1V

V SHDN = 0 to VCC

FBSEL = GND

FBSEL = REF

160

2.5

2.6

2.7

0

60

250

0.9 1.00 1.1

0.24 0.30 0.37

3.8

4.5

5.2

4 ✕ tOFF

0.4

4

5

6

100

-1

1

0.8

2.0

-4

+4

0.2

0.9

1.3

FBSEL Logic Thresholds

FBSEL = unconnected

0.7 ✕ VCC 0.7 ✕ VCC

- 0.2

+0.2

FBSEL = VCC

VCC

- 0.2

UNITS

A

A

A

MHz

µA

µA

µA

°C

V

nA

µs

µs

µs

µA

µA

µA

V

V

µA

V

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