MAX8745 datasheet(5/36 Pages) MAXIM

5 / 36 page

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 = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Output Undervoltage Protection

Trip Threshold

With respect to error-comparator

threshold

Output Undevoltage Fault

Propagation Delay

tUVP

50mV overdrive

µs

Output Undervoltage Protection

Blanking Time

tBLANK

From rising edge of ON_ with respect to

fSW

5000

6144

7000

1/fOSC

PGOOD_ Lower Trip Threshold

With respect to error-comparator

threshold, hysteresis = 1% (typ)

-12

-10

-8

Falling edge, 50mV overdrive

PGOOD_ Propagation Delay

tPGOOD_

Rising edge, 50mV overdrive

µs

PGOOD_ Output Low Voltage

ISINK = 1mA

0.4

PGOOD_ Leakage Current

IPGOOD_

High state, PGOOD_ forced to 5.5V

µA

Thermal-Shutdown Threshold

tSHDN

Hysteresis = 15°C

+160

°C

GATE DRIVERS

DH_ Gate-Driver On-Resistance

RDH

BST_ – LX_ forced to 5V

1.3

DL_, high state

1.7

DL_ Gate-Driver On-Resistance

RDL

DL_, low state

0.6

DH_ Gate-Driver Source/Sink

Current

IDH

DH_ forced to 2.5V, BST_ – LX_ forced to

DL_ Gate-Driver Source Current

IDL (SOURCE) DL_ forced to 2.5V

1.7

DL_ Gate-Driver Sink Current

IDL (SINK)

DL_ forced to 2.5V

3.3

DH_low to DL_high

Dead Time

tDEAD

DL_low to DH_high

Internal BST_ Switch On-

Resistance

RBST

IBST = 10mA

BST_ Leakage Current

VBST_ = 26V

µA

INPUTS AND OUTPUTS

Rising trip level

1.1

1.6

2.2

SHDN Input Trip Level

Falling trip level

0.96

1.04

High

2.4

ONA Logic Input Voltage

Hysteresis = 600mV (typ)

Low

0.8

SMPS off level/clear fault level

0.8

Delay start level

1.9

2.1

ON3, ON5 Input Voltage

SMPS on level

2.4

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