MAX8744A datasheet(4/36 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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4 / 36 page

High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(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

Soft-Start Ramp Time

tSSTART

Measured from the rising edge of ON_ to

full scale

2ms

Soft-Stop Ramp Time

tSSTOP

Measured from the falling edge of ON_ to

full scale

4ms

INTERNAL FIXED LINEAR REGULATORS

LDO5 Output Voltage

VLDO5

ON5 = GND, 6V < VIN < 26V,

0 < ILDO5 < 100mA

4.85

4.95

5.10

V

LDO5 Undervoltage-Lockout Fault

Rising edge, hysteresis = 1%

3.7

4.0

4.1

V

Short-Circuit Current (Switched

Over to CSL5)

LDO5 = GND, VCSL5 > 4.7V

200

425

mA

AUXILIARY LINEAR REGULATOR

DRVA Voltage Range

VDRVA

0.5

26.0

V

VFBA = 1.05V, VDRVA = 5V

0.4

DRVA Drive Current

VFBA = 0.965V, VDRVA = 5V

10

mA

FBA Regulation Threshold

VFBA

VDRVA = 5V, IDRVA = 1mA (sink)

0.98

1.00

1.02

V

FBA Load Regulation

VDRA = 5V, IDRVA = 0.5mA to 5mA

-1.2

-2.2

%

OUTA Shunt Trip Level

Rising edge

25

26

27

V

FBA Leakage Current

VFBA = 1.035V

-0.1

+0.1

µA

Secondary Feedback Regulation

Threshold

VDRVA - VOUTA

0V

DL5 Pulse Width

1/

3fOSC

µs

OUTA Leakage Current

IOUTA

VDRVA = VOUTA = 25V

50

µA

REFERENCE (REF)

Reference Voltage

VREF

LDO5 in regulation, IREF = 0

1.985

2.00

2.015

V

Reference Load-Regulation Error

ΔVREF

IREF = -5µA to +50µA

-10

+10

mV

REF Lockout Voltage

VREF(UVLO)

Rising edge

1.8

V

FAULT DETECTION

Output Overvoltage Trip Threshold

(MAX8744A Only)

With respect to error-comparator

threshold

811

14

%

Output Overvoltage Fault

Propagation Delay (MAX8744A Only)

tOVP

50mV overdrive

10

µs

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