Rainbow-electronics MAX1557 Manual do Utilizador descarregar pdf (Página 2)

MAX1556/MAX1557

16µA I

, 1.2A PWM DC-DC

Step-Down Converters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= V

INP

= V

SHDN

= 3.6V, T

= - 40°C to +85°C. Typical values are at T

= +25°C, unless otherwise noted.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN, INP, OUT, D2, SHDN to GND ..........................-0.3V to +6.0V

SS, D1 to GND.............................................-0.3V to (V

+ 0.3V)

PGND to GND .......................................................-0.3V to +0.3V

LX Current (Note 1)...........................................................±2.25A

Output Short-Circuit Duration.....................................Continuous

Continuous Power Dissipation (T

= +70°C)

10-Pin TDFN (derate 24.4mW/°C above +70°C) .......1951mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER CONDITIONS

MIN TYP MAX

UNITS

Input Voltage 2.6 5.5 V

Undervoltage-Lockout Threshold

rising and falling, 35mV hysteresis (typ)

2.20 2.35 2.55

No switching, D1 = D2 = GND 16 25

Quiescent Supply Current

Dropout 27 42

µA

= +25°C 0.1 1

Shutdown Supply Current SHDN = GND

= +85°C 0.1

µA

Output Voltage Range

0.75

No load

-0.25 +0.75 +1.75

300mA load

-0.75

+0.75

600mA load

-1.5 -0.75

= 0°C to +85°C

(Note 2)

1200mA load, MAX1556 only

-2.75 -2.25 -1.25

No load

-0.75 +2.25

300mA load

-1.5 +1.5

600mA load

-2.25 +0.50

Output Accuracy

= -40°C to +85°C

(Note 2)

1200mA load, MAX1556 only

-4.0 -1.0

MAX1556

1200

Maximum Output Current

MAX1557

600

= +25°C

0.01

0.1

D1 = D2 = GND

= +85°C

0.01

OUT Bias Current

For preset output voltages 3 4.5

µA

No load

-0.50 +0.75 +1.75

300mA load

-1.2

+1.2

600mA load

-1.75 -0.75 +0.25

D1 = D2 = GND,

OUT

= 0.75V at

300mA (typ),

= 0°C to +85°C

1200mA load, MAX1556 only

-3.25 -2.25 -1.25

No load

-1.25 +2.25

300mA load

-1.75 +1.50

600mA load

-2.75 +0.25

FB Threshold Accuracy

D1 = D2 = GND,

OUT

= 0.75V

at 300mA (typ),

= -40°C to +85°C

1200mA load, MAX1556 only

-4.25 -1.00

Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should take care not to exceed

the IC’s package power-dissipation limits.

1 2 3 4 5 6 7 ... 11 12

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