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MAX1777

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

Maxim Integrated 

High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

ABSOLUTE MAXIMUM RATINGS

V+, SHDN to GND ..................................................-0.3V to +25V

BST_ to GND ..........................................................-0.3V to +30V

LX_ to BST_ ..............................................................-6V to +0.3V

CS_ to GND (MAX1777/MAX1977 only)......................-2V to +6V

VCC, LDO5, LDO3, OUT3, OUT5, ON3, ON5, REF,

FB3, FB5, SKIP, PRO, PGOOD to GND ...............-0.3V to +6V

DH3 to LX3 ..............................................-0.3V to (VBST3 + 0.3V)

DH5 to LX5 ..............................................-0.3V to (VBST5 + 0.3V)

ILIM3, ILIM5 to GND...................................-0.3V to (VCC + 0.3V)

DL3, DL5 to GND....................................-0.3V to (VLDO5 + 0.3V)

TON to GND (MAX1999 only)...................................-0.3V to +6V

LDO3, LDO5, REF Short Circuit to GND ....................Momentary

LDO3 Current (Internal Regulator) Continuous ..............+100mA

LDO3 Current (Switched Over to OUT3) Continuous.....+200mA

LDO5 Current (Internal Regulator) Continuous ..............+100mA

LDO5 Current (Switched Over to OUT5) Continuous.....+200mA

Continuous Power Dissipation

28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, V SHDN = 5V,

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

PARAMETER

MAIN SMPS CONTROLLERS

V+ Input Voltage Range

3.3V Output Voltage in

Fixed Mode

CONDITIONS

LDO5 in regulation

V+ = LDO5, VOUT5 < 4.43V

V+ = 6V to 24V, FB3 = GND, V SKIP = 5V

MIN TYP MAX UNITS

6

24

V

4.5

5.5

3.285 3.330 3.375

V

5V Output Voltage in Fixed Mode

V+ = 6V to 24V, FB5 = GND, V SKIP = 5V,

MAX1777/MAX1999 (TON = VCC)

V+ = 7V to 24V, FB5 = GND, V SKIP = 5V,

MAX1977/MAX1999 (TON = GND)

4.975 5.050 5.125

V

Output Voltage in

Adjustable Mode

V+ = 6V to 24V, either SMPS

1.975 2.00 2.025

V

Output Voltage Adjust Range

Either SMPS

2.0

5.5

V

FB3, FB5 Adjustable-Mode

Threshold Voltage

Dual-mode comparator

0.1

0.2

V

DC Load Regulation

Line Regulation

Either SMPS, V SKIP = 5V, 0 to 5A

Either SMPS, SKIP = GND, 0 to 5A

Either SMPS, V SKIP = 2V, 0 to 5A

Either SMPS, 6V < V+ < 24V

-0.1

-1.5

%

-1.7

0.005

%/V

Current-Limit Threshold

(Positive, Default)

ILIM_ = VCC, GND - CS_ (MAX1777/MAX1977),

GND - LX_ (MAX1999)

93

100 107

mV

Current-Limit Threshold

(Positive, Adjustable)

Zero-Current Threshold

GND - CS_

VILIM_ = 0.5V

(MAX1777/MAX1977),

GND - LX_ (MAX1999)

VILIM_ = 1V

VILIM_ = 2V

SKIP = GND, ILIM_ = VCC, GND - CS_

(MAX1777/MAX1977), GND - LX_ (MAX1999)

40

50

60

93

100 107

mV

185 200 215

3

mV

Current-Limit Threshold

SKIP = ILIM_ = VCC, GND - CS_ (MAX1777/MAX1977),

-120

mV

(Negative, Default)

GND - LX_ (MAX1999)

Soft-Start Ramp Time

Zero to full limit

1.7

ms

2 _______________________________________________________________________________________

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