MAX8745 datasheet(6/36 Pages) MAXIM

6 / 36 page

High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

_______________________________________________________________________________________

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

PARAMETER

SYMBOL

CONDITIONS

MIN

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

VIN Operating Supply Current

IIN

LDO5 switched over to CSL5, either SMPS on

µA

VIN Standby Supply Current

IIN(STBY)

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

ISHDN

120

µA

VIN Shutdown Supply Current

IIN(SHDN) VIN = 6V to 26V

µA

Quiescent Power Consumption

Both SMPS on, FB3 = FB5 = LDO5; SKP =

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

VOUTA = 15V,

PIN + PCSL3 + PCSL5

4.5

MAIN SMPS CONTROLLERS

3.3V Output Voltage in Fixed

Mode

VOUT3

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

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

3.255

3.375

5V Output Voltage in Fixed Mode

VOU5

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

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

4.925

5.105

Feedback Voltage in Adjustable

Mode

VFB_

VIN = 6V to 26V, FB3 or FB5

duty factor = 20% to 80% (Note 2)

1.974

2.046

Output Voltage Adjust Range

Either SMPS

2.0

5.5

FB3, FB5 Dual Mode Threshold

VLDO5

- 0.4

FSEL = GND

170

230

FSEL = REF

270

330

Operating Frequency (Note 1)

fOSC

FSEL = LDO5

425

575

kHz

Maximum Duty Factor

DMAX

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

High

VLDO5

- 0.4

REF

1.65

2.35

Tri-Level Input Logic

SKIP, FSEL

GND

0.5

SKIP, FSEL forced to GND or LDO5

-1

Input Leakage Current

SHDN forced to GND or 26V

-1

µA

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