MAX8640YEXT24-T(2009) Ver la hoja de datos (PDF) - Maxim Integrated

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MAX8640YEXT24-T
(Rev.:2009)

Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters

Maxim Integrated 

Tiny 500mA, 4MHz/2MHz Synchronous

Step-Down DC-DC Converters

ABSOLUTE MAXIMUM RATINGS

IN to GND .................................................................-0.3V to +6V

OUT, SHDN to GND ....................................-0.3V to (VIN + 0.3V)

LX Current (Note 1) ........................................................0.8ARMS

OUTPUT Short Circuit to GND ...................................Continuous

Continuous Power Dissipation (TA = +70°C)

6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW

6-Pin µDFN (derate 2.1mW/°C above +70°C) ..............167.7mW

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

Note 1: LX has internal clamp diodes to IN and GND. Applications that forward bias these diodes should not exceed the IC’s package

power-dissipation limit.

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 = 3.6V, SHDN = IN, TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.) (Note 2)

PARAMETER

Supply Range

UVLO Threshold

Supply Current

Output Voltage Range

Output Voltage Accuracy

(Falling Edge)

Output Load Regulation

(Voltage Positioning)

SYMBOL

CONDITIONS

VIN

UVLO VIN rising, 100mV hysteresis

No load, no switching

ICC

SHDN = GND

TA = +25°C

TA = +85°C

VOUT Factory preset

ILOAD = 0mA, TA = +25°C

ILOAD = 0mA, TA = -40°C to +85°C

Equal to inductor DC resistance

MIN TYP

2.7

2.44 2.6

28

0.01

0.1

0.8

-1

0

-2

RL

SHDN Logic Input Level

SHDN Logic Input Bias Current

Peak Current Limit

Valley Current Limit

Rectifier Off-Current Threshold

On-Resistance

LX Leakage Current

Minimum On and Off Times

Thermal Shutdown

Thermal-Shutdown Hysteresis

VIH

VIL

IIH,IL

ILIMP

ILIMN

ILXOFF

RONP

RONN

ILXLKG

tON(MIN)

tOFF(MIN)

VIN = 2.7V to 5.5V

VIN = 2.7V to 5.5V

VIN = 5.5V,

SHDN = GND or IN

TA = +25°C

TA = +85°C

pFET switch

nFET rectifier

nFET rectifier

pFET switch, ILX = -40mA

nFET rectifier, ILX = 40mA

VIN = 5.5V, LX = GND TA = +25°C

to IN, SHDN = GND

TA = +85°C

1.4

0.001

0.01

590 770

450 650

10

40

0.6

0.35

0.1

1

95

95

+160

20

MAX

5.5

2.70

48

0.1

2.5

+1

+2

0.4

1

1400

1300

70

1.2

0.7

1

UNITS

V

V

µA

V

%

V/A

V

µA

mA

mA

mA

Ω

µA

ns

°C

°C

Note 2: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.

2 _______________________________________________________________________________________

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