Rainbow-electronics MAX1524 Manual do Utilizador descarregar pdf (Página 2)

Simple SOT23 Boost Controllers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= SHDN = 3.3V, SET = GND , T

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

= +25°C.)

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.

Note 1: Actual startup voltage is dependent on the external MOSFET’s V

GS(TH)

Note 2: Specification applies after soft-start mode is completed.

, FB, SHDN, SET to GND...................................-0.3V to +6V

EXT to GND................................................-0.3V to (V

+ 0.3V)

Continuous Power Dissipation (T

= +70°C)

6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW

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

Operating Voltage Range 2.5 5.5 V

MAX1522/MAX1523 2.5

Minimum Startup Voltage

EXT

> 100kHz, MAX1524 (Note 1), bootstrap required 1.5

rising

2.37 2.47

Undervoltage Lockout

Threshold

falling

2.20 2.30

Supply Current No load, nonbootstrapped 25 50 µA

Shutdown Current SHDN = GND

0.001

1µA

SET = GND 0.4 0.5 0.6

Fixed t

Time V

=1.2V

SET = V

2.4 3.0 3.6

µs

> 0.675V 0.5

Minimum t

OFF

Time

< 0.525V 1.0

µs

SET = GND 45 50 55

Maximum Duty Factor

SET = V

80 85 90

FB Regulation Threshold

(Note 2)

= +2.5V to +5.5V

1.23 1.25 1.27

FB Undervoltage Fault

Threshold (Note 2)

FB falling

525

575 625 mV

FB Input Bias Current V

= 1.3V 6 50 nA

EXT high 2 4

EXT Resistance I

EXT

= 20mA

EXT low 1.5 3

Ω

Soft-Start Ramp Time 2.2 3.2 4.2 ms

Logic Input High V

= +2.5V to +5.5V, SET, SHDN 1.6 V

Logic Input Low V

= +2.5V to +5.5V, SET, SHDN 0.4 V

Logic Input Leakage Current SET, SHDN = V

or GND -1 +1 µA

MAX1522/MAX1523/MAX1524

1 2 3 4 5 6 7 ... 13 14

MAX1522/MAX1523/MAX1524 1

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