MAX8650(2006) Ver la hoja de datos (PDF) - Maxim Integrated

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MAX8650
(Rev.:2006)

4.5V to 28V Input Current-Mode Step-Down Controller with Adjustable Frequency

Maxim Integrated 

4.5V to 28V Input Current-Mode Step-Down

Controller with Adjustable Frequency

ABSOLUTE MAXIMUM RATINGS

IN, EN to GND ........................................................-0.3V to +30V

BST to LX...............................................................-0.3V to +7.5V

DH to LX ....................................................-0.3V to (VBST + 0.3V)

LX to GND .................... -1V (-2.5V for < 50ns transient) to +30V

DL to PGND.................................................-0.3V to (VVL + 0.3V)

ILIM2, ILIM1, SYNCO, FSYNC, OVP,

SCOMP to GND .....................................-0.3V to (VAVL + 0.3V)

VL to PGND ...........................................................-0.3V to +7.5V

AVL, FB, POK, COMP, SS, MODE, REFIN to GND .....-0.3V to +6V

CS+, CS- to GND .....................................................-0.3V to +6V

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

Continuous Power Dissipation (TA = +70°C)

24-Pin QSOP (derate 9.5mW/°C above +70°C)..........762mW

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

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

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

ELECTRICAL CHARACTERISTICS

(VIN = 12V, VBST - VLX = 6.5V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)

PARAMETER

Operating Input Voltage Range

Quiescent Supply Current

Shutdown Supply Current

IIN + IVL + IAVL

AVL Undervoltage-Lockout Trip

Level

CONDITIONS

VL = IN for VIN < 7V

VFB = 0.75V, no switching

EN = GND, VIN ≤ 28V

EN = GND, VAVL = VVL = VIN = 5V

VAVL rising, 3% typ hysteresis

MIN TYP MAX

4.5

28.0

2

3

10

32

3.90 4.15 4.40

Output Voltage Adjust Range

VL Regulation Voltage

VL Output Current

AVL Regulation Voltage

AVL Output Current

SOFT-START

SS Shutdown Resistance

SS Soft-Start Current

REFIN INPUT

Minimum output voltage is limited by minimum duty cycle

and external components

7V < VIN < 28V, 1mA < ILOAD < 40mA

5.5V < VVL < 7V, 1mA < ILOAD < 10mA

0.7

6.0

40

4.900

10

6.5

4.975

5.5

7.0

5.050

From SS to GND, VEN = 0V

VSS = 0.625V

20

100

18

23

28

REFIN Dual Mode™ Threshold

VAVL -

1.0V

VAVL

REFIN Input Bias Current

REFIN Input Voltage Range

VREFIN = 0.7V to 1.5V

-250

0

+250

1.5

UNITS

V

mA

µA

V

V

V

mA

V

mA

Ω

µA

V

nA

V

Dual Mode is a trademark of Maxim Integrated Products, Inc.

2 _______________________________________________________________________________________

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