MAX8744A datasheet(2/36 Pages) MAXIM

Teilenummer	MAX8744A

Bauteilbeschribung	High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers

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Hersteller	MAXIM [Maxim Integrated Products]

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High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

IN, SHDN, DRVA, OUTA to GND............................-0.3V to +28V

LDO5, ON3, ON5, ONA to GND ..............................-0.3V to +6V

PGOODA, PGOOD3, PGOOD5 to GND...................-0.3V to +6V

CSL3, CSH3, CSL5, CSH5 to GND ..........................-0.3V to +6V

REF, FB3, FB5, FBA to GND...................-0.3V to (VLDO5 + 0.3V)

SKIP, FSEL, ILIM to GND........................-0.3V to (VLDO5 + 0.3V)

DL3, DL5 to PGND..................................-0.3V to (VLDO5 + 0.3V)

BST3, BST5 to PGND .............................................-0.3V to +34V

BST3 to LX3..............................................................-0.3V to +6V

DH3 to LX3 ..............................................-0.3V to (VBST3 + 0.3V)

BST5 to LX5..............................................................-0.3V to +6V

DH5 to LX5 ..............................................-0.3V to (VBST5 + 0.3V)

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

BST3, BST5 to LDO5 .............................................-0.3V to +0.3V

LDO Short Circuit to GND ..........................................Momentary

REF Short Circuit to GND ...........................................Momentary

DRVA Current (Sinking) ......................................................30mA

OUTA Shunt Current ...........................................................30mA

Continuous Power Dissipation (TA = +70°C)

Multilayer PCB

32-Pin, 5mm x 5mm TQFN

(derated 34.5mW/°C above +70°C) .........................2459mW

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

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VIN = 12V, both SMPS enabled, FSEL = REF, SKIP = GND, ILIM = LDO5, FBA = LDO5, IREF = ILDO5 = IOUTA =

no load, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

INPUT SUPPLIES (Note 1)

LDO5 in regulation

5.4

26.0

VIN Input Voltage Range

VIN

IN = LDO5, VCSL5 < 4.4V

4.5

5.5

V

VIN Operating Supply Current

IIN

LDO5 switched over to CSL5, either

SMPS on

20

36

µA

VIN Standby Supply Current

IIN(STBY)

VIN = 6V to 26V, both SMPS off, includes

ISHDN

65

120

µA

VIN Shutdown Supply Current

IIN(SHDN)

VIN = 6V to 26V

8

20

µA

Quiescent Power Consumption

PQ

Both SMPS on, FB3 = FB5 = LDO5,

SKIP = GND, VCSL3 = 3.5V, VCSL5 = 5.3V,

VOUTA = 15V,

PIN + PCSL3 + PCSL5 + POUTA

3.5

4.5

mW

MAIN SMPS CONTROLLERS

3.3V Output Voltage in Fixed

Mode

VOUT3

VIN = 6V to 26V, SKIP = FB3 = LDO5,

0 < VCSH3 - VCSL3 < 50mV (Note 2)

3.265

3.315

3.365

V

5V Output Voltage in Fixed Mode

VOUT5

VIN = 6V to 26V, SKIP = FB5 = LDO5,

0 < VCSH5 - VCSL5 < 50mV (Note 2)

4.94

5.015

5.09

V

VIN = 6V to 26V, FB3 or FB5

duty factor = 20% to 80%

1.980

2.010

2.040

Feedback Voltage in Adjustable

Mode (Note 2)

VFB_

VIN = 6V to 26V, FB3 or FB5

duty factor = 50%

1.990

2.010

2.030

V

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