MAX8792 Просмотр технического описания (PDF) - Maxim Integrated

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MAX8792

Single Quick-PWM Step-Down Controller with Dynamic REFIN

Maxim Integrated 

Single Quick-PWM Step-Down

Controller with Dynamic REFIN

ABSOLUTE MAXIMUM RATINGS

TON to GND ...........................................................-0.3V to +28V

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

VCC to GND ................................................-0.3V to (VDD + 0.3V)

EN, SKIP, PGOOD to GND.......................................-0.3V to +6V

REF, REFIN to GND ....................................-0.3V to (VCC + 0.3V)

ILIM, FB to GND .........................................-0.3V to (VCC + 0.3V)

DL to GND ..................................................-0.3V to (VDD + 0.3V)

BST to GND .................................................(VDD - 0.3V) to +34V

BST to LX..................................................................-0.3V to +6V

BST to VDD .............................................................-0.3V to +28V

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

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

Continuous Power Dissipation (TA = +70°C)

14-Pin 3mm x 3mm TDFN

(derated 24.4mW/°C above +70°C)....................1951mW

Operating Temperature Range (extended) .........-40°C to +85°C

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

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

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

Soldering Temperature (reflow) .......................................+240°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

(Circuit of Figure 1, VIN = 12V, VDD = VCC = VEN = 5V, REFIN = ILIM = REF, SKIP = GND. TA = 0°C to +85°C, unless otherwise spec-

ified. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

PWM CONTROLLER

Input Voltage Range

Quiescent Supply Current (VDD)

Shutdown Supply Current (VDD)

VDD-to-VCC Resistance

On-Time

Minimum Off-Time

TON Shutdown Supply Current

REFIN Voltage Range

FB Voltage Range

FB Voltage Accuracy

FB Input Bias Current

Load-Regulation Error

Line-Regulation Error

Soft-Start/-Stop Slew Rate

Dynamic REFIN Slew Rate

REFERENCE

VIN

IDD + ICC

ISHDN

RCC

tON

tOFF(MIN)

VREFIN

VFB

VFB

IFB

tSS

tDYN

FB forced above REFIN

EN = GND, TA = +25°C

VIN = 12V,

VFB = 1.0V

(Note 3)

RTON = 97.5kΩ (600kHz)

RTON = 200kΩ (300kHz)

RTON = 302.5kΩ (200kHz)

(Note 3)

EN = GND, VTON = 26V,

VCC = 0V or 5V, TA = +25°C

(Note 2)

(Note 2)

VREFIN = 0.5V,

measured at FB,

VIN = 2V to 26V,

SKIP = VDD

TA = +25°C

TA = 0°C to +85°C

VREFIN = 1.0V

TA = +25°C

TA = 0°C to +85°C

VREFIN = 2.0V TA = 0°C to +85°C

VFB = 0.5V to 2.0V, TA = +25°C

ILOAD = 0 to 3A, SKIP = VDD

VCC = 4.5V to 5.5V, VIN = 4.5V to 26V

Rising/falling edge on EN

Rising edge on REFIN

2

118

250

354

0

0

0.495

0.493

0.995

0.993

1.990

-0.1

0.7

0.1

20

139

278

417

200

0.01

0.5

1.0

2.0

0.1

0.25

1

8

26

V

1.2

mA

2

μA

Ω

160

306

ns

480

300

ns

1

μA

VREF

V

VREF

V

0.505

0.507

1.005

1.007

2.010

+0.1

V

μA

%

%

mV/μs

mV/μs

Reference Voltage

VREF

VCC = 4.5V

to 5.5V

No load

IREF = -10μA to +50μA

1.990 2.00 2.010

V

1.98

2.02

2 _______________________________________________________________________________________

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