Rainbow-electronics MAX1842 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1742/MAX1842

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

Synchronous Rectification and Internal Switches

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= V

= 3.3V, FBSEL = GND, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAX1742 1.3 1.5 1.7

Current-Limit Threshold I

LIMIT

MAX1842 3.1 3.6 4.1

RMS LX Output Current 3.1 A

MAX1742 0.1 0.3 0.5

Idle Mode Current Threshold I

MAX1842 0.3 0.6 0.9

Switching Frequency f (Note 2) 1

MHz

No-Load Supply Current

+ I

= 1.2V

350 600

µA

Shutdown Supply Current

(SHDN)

SHDN = GND <1 5 µA

PMOS Switch Off-Leakage

Current

SHDN = GND 15 µA

Thermal Shutdown Threshold

SHDN

Hysteresis = 15°C

160

°C

Undervoltage Lockout Threshold

UVLO

falling, hysteresis = 90mV 2.5 2.6 2.7 V

FB Input Bias Current I

= 1.2V 0 60

250

TOFF

= 110kΩ 0.9

1.00

1.1

TOFF

= 30.1kΩ

0.24 0.30 0.37

Off-Time Default Period t

OFF

TOFF

= 499kΩ 3.8 4.5 5.2

µs

Off-Time Startup Period t

OFF

FB = GND 4

OFF

µs

On-Time Period t

(Note 2) 0.4 µs

SS Source Current I

4 5 6 µA

SS Sink Current I

= 1V

100

µA

SHDN Input Current

SHDN

= 0 to V

-1 1 µA

SHDN Input Low Threshold V

0.8 V

SHDN Input High Threshold V

2.0 V

FBSEL Input Current -4 +4 µA

FBSEL = GND 0.2

FBSEL = REF 0.9 1.3

FBSEL = unconnected

0.7

VCC

- 0.2

0.7

VCC

+0.2

FBSEL Logic Thresholds

FBSEL = V

- 0.2

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

MAX1742/MAX1842 1

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