MAX1977EEI datasheet(6/32 Pages) MAXIM

Part #	MAX1977EEI

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

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

6

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12.0.V, ON3 = ON5 = VCC, V SHDN = 5V,

TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

LDO5 Bootstrap Switch Threshold

Falling edge of OUT5, rising edge at OUT5 regulation

point

4.43

4.69

V

LDO5 Bootstrap

Switch Resistance

LDO5 to OUT5, VOUT5 = 5V

3.2

Ω

LDO3 Output Voltage

ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO3 < 100mA

3.27

3.43

V

LDO3 Bootstrap Switch Threshold

Falling edge of OUT3, rising edge at OUT3 regulation

point

2.80

3.02

V

LDO3 Bootstrap

Switch Resistance

LDO3 to OUT3, VOUT3 = 3.2V

3.5

Ω

REF Output Voltage

No external load

1.975

2.025

V

REF Load Regulation

0 < ILOAD < 50µA

10

mV

REF Sink Current

REF in regulation

10

µA

V+ Operating Supply Current

LDO5 switched over to OUT5, 5V SMPS

50

µA

V+ Standby Supply Current

V+ = 6V to 24V, both SMPSs off, includes ISHDN

300

µA

V+ Shutdown Supply Current

V+ = 4.5V to 24V

15

µA

Quiescent Power Consumption

Both SMPSs on, FB3 = FB5 = SKIP = GND, VOUT3 =

3.5V, VOUT5 = 5.3V

4.5

mW

FAULT DETECTION

Overvoltage Trip Threshold

FB3 or FB5 with respect to nominal regulation point

+8

+14

%

PGOOD Threshold

FB3 or FB5 with respect to nominal output, falling edge,

typical hysteresis = 1%

-12

-7

%

PGOOD Output Low Voltage

ISINK = 4mA

0.3

V

PGOOD Leakage Current

High state, forced to 5.5V

1

µA

Output Undervoltage

Shutdown Threshold

FB3 or FB5 with respect to nominal output voltage

65

75

%

Output Undervoltage

Shutdown Blanking Time

From ON_ signal

10

40

ms

INPUTS AND OUTPUTS

Feedback Input Leakage Current

VFB3 = VFB5 = 2.2V

-200

+200

nA

Low level

0.6

PRO Input Voltage

High level

1.5

V

Low level

0.8

Float level

1.7

2.3

SKIP Input Voltage

High level

2.4

V

Low level

0.8

TON Input Voltage

High level

2.4

V

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