MAX8745 datasheet(7/36 Pages) MAXIM

7 / 36 page

High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

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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

SYMBOL

CONDITIONS

MIN

MAX

UNITS

CURRENT LIMIT

ILIM Adjustment Range

0.5

VREF

Current-Limit Threshold (Fixed)

VLIMIT

VCSH_ - VCSL _, ILIM = LDO5

VILIM = 2.00V

185

215

Current-Limit Threshold

(Adjustable)

VLIMIT

VCSH_ - VCSL _

VILIM = 1.00V

107

INTERNAL FIXED LINEAR REGULATORS

LDO5 Output Voltage

VLDO5

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

0 < ILDO5 < 100mA

4.85

5.10

LDO5 Undervoltage-Lockout Fault

Threshold

Rising edge, hysteresis = 1% (typ)

3.7

4.1

LDO5 Bootstrap Switch Threshold

Rising edge of CSL5, hysteresis = 1% (typ)

4.30

4.75

Short-Circuit Current

LDO5 = GND, ON5 = GND

450

Short-Circuit Current (Switched

over to CSL_)

LDO5 = GND, VCSL5 > 4.7V

200

AUXILIARY LINEAR REGULATOR

DRVA Voltage Range

VDRVA

0.5

VFBA = 1.05V, VDRVA = 5V

0.4

DRVA Drive Current

VFBA = 0.965V, VDRVA = 5V

FBA Regulation Threshold

VFBA

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

0.98

1.02

OUTA Shunt Trip Level

REFERENCE (REF)

Reference Voltage

VREF

LDO5 in regulation, IREF = 0

1.980

2.020

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