MAX8744ETJ-T 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8744ETJ-T

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

Maxim Integrated 

High-Efficiency, Quad-Output, Main Power-

Supply Controllers for Notebook Computers

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 = -40°C to +85°C, unless otherwise noted.) (Note 3)

PARAMETER

FAULT DETECTION

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Output Overvoltage Trip

Threshold (MAX8744 Only)

Output Undervoltage Protection

With respect to error comparator threshold

8

With respect to error comparator threshold

65

14

%

75

%

PGOOD_ Lower Trip Threshold

With respect to error comparator threshold,

hysteresis = 1%

-12

-8

%

PGOOD_ Output Low Voltage

GATE DRIVERS

DH_ Gate-Driver On-Resistance

DL_ Gate-Driver On-Resistance

INPUTS AND OUTPUTS

SHDN Input Trip Level

ONA Logic Input Voltage

ON3, ON5 Input Voltage

Tri-Level Input Logic

ISINK = 1mA

RDH BST_ – LX_ forced to 5V

DL_, high state

RDL

DL_, low state

Rising trip level

Falling trip level

Hysteresis = 600mV

SMPS off level/clear fault level

Delay start level

SMPS on level

SKIP, FSEL

High

Low

High

REF

GND

1.0

0.96

2.4

1.9

2.4

VLDO5 - 0.4

1.65

0.4

V

5

Ω

5

Ω

3

2.3

V

1.04

V

0.8

0.8

2.1

V

2.35

V

0.5

Note 1: The MAX8744/MAX8745 cannot operate over all combinations of frequency, input voltage (VIN), and output voltage. For

large input-to-output differentials and high switching-frequency settings, the required on-time may be too short to maintain

the regulation specifications. Under these conditions, a lower operating frequency must be selected. The minimum on-time

must be greater than 150ns, regardless of the selected switching frequency. On-time and off-time specifications are mea-

sured from 50% point to 50% point at the DH_ pin with LX_ = GND, VBST_ = 5V, and a 250pF capacitor connected from

DH_ to LX_. Actual in-circuit times may differ due to MOSFET switching speeds.

Note 2: When the inductor is in continuous conduction, the output voltage has a DC-regulation level lower than the error-comparator

threshold by 50% of the ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage has a DC regula-

tion level higher than the trip level by approximately 1% due to slope compensation.

Note 3: Specifications from -40°C to +85°C are guaranteed by design, not production tested.

8 _______________________________________________________________________________________

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