MAX1623 查看數據表（PDF） - Maxim Integrated

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MAX1623

3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

Maxim Integrated 

3A, Low-Voltage, Step-Down Regulator with

Synchronous Rectification and Internal Switches

ABSOLUTE MAXIMUM RATINGS

IN to PGND .....................................................................0V to 6V

VCC to GND ................................................................-0.3V to 6V

PGND to GND.....................................................................±0.5V

IN to VCC.............................................................................±0.5V

LX Current (Note 1).............................................................±5.5A

SHDN to GND .............................................................-0.3V to 6V

REF, FBSEL, COMP, FB, TOFF to GND .....-0.3V to (VCC + 0.3V)

REF Short to GND ......................................................Continuous

Continuous Power Dissipation (TA = +70°C) (with part mounted

on 1 sq. inch of one ounce copper)

20-Pin SSOP (derate 22mW/°C above +70°C) ................1.3W

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

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

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

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

the IC’s package power dissipation limits.

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.

ELECTRICAL CHARACTERISTICS

(VIN = VCC = 5V, FBSEL unconnected, RTOFF = 110kΩ, TA = 0°C to +85°C, unless otherwise noted. Typical values are at

TA = +25°C.)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Input Voltage Range

4.5

5.5

V

Output Voltage

VIN = 4.5V to 5.5V,

ILOAD = 0 to 3A

FBSEL = unconnected

3.296 3.330 3.366

FBSEL = VCC

2.49 2.525 2.550

V

FBSEL = GND or REF

1.089 1.100 1.110

Output Adjustment Range

FBSEL = GND or REF (Note 2)

VREF

3.80

V

Reference Output Voltage

IREF = 0

1.089 1.100 1.110

V

Reference Load Regulation

IREF = -1µA to 10µA

1

mV

Current-Limit Threshold

3.65

4.65

A

RMS LX Output Current

3.65

A

PMOS Switch On-Resistance

VIN = 4.5V

55

100

mΩ

NMOS Switch On-Resistance

VIN = 4.5V

60

100

mΩ

Maximum Switching Frequency

ILOAD ≥ 1.5A (Note 2)

350 kHz

Idle Mode Threshold (Note 3)

1

1.25

1.5

A

No-Load Supply Current

Does not include switching losses

400

525

µA

Shutdown Supply Current

SHDN = GND

0.5

10

µA

LX Leakage Current

VIN = 5.5V, VLX = 5.5V or 0

±20

µA

Thermal Shutdown Threshold

145

°C

Undervoltage Lockout Threshold

VCC falling, 100mV hysteresis

4.1

4.2

4.3

V

FB Input Bias Current

FBSEL = GND, adjustable output mode, VFB = 1.2V

-25

25

nA

Error-Amplifier Gain Bandwidth

(Note 2)

500

kHz

Off-Time Adjustment Range

0.5

4

µs

Off-Time Default Period

0.85 1.00 1.15

µs

AC Output Load Regulation

FBSEL = GND

FBSEL = REF

1

%

2

SHDN Input Current

SHDN Input Low Voltage

SHDN Input High Voltage

SHDN = GND or VCC

-1

0.03

1

µA

0.8

V

2

V

2 _______________________________________________________________________________________

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