High-Efficiency, Quad-Output, Main Power-

Supply Controllers for Notebook Computers

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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.

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 (MAX8732/MAX8733 only)......................-2V to +6V

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

TON to GND (MAX8734 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

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

MAIN SMPS CONTROLLERS

LDO5 in regulation

6

24

V+ Input Voltage Range

4.5

5.5

V

3.3V Output Voltage in

Fixed Mode

3.285

3.330

3.375

V

5V Output Voltage in Fixed Mode

MAX8733/MAX8734 (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

-0.1

Either SMPS, SKIP = GND, 0 to 5A

-1.5

DC Load Regulation

-1.7

%

Line Regulation

Either SMPS, 6V < V+ < 24V

0.005

%/V

Current-Limit Threshold

(Positive, Default)

GND - LX_ (MAX8734)

93

100

107

mV

40

50

60

93

100

107

Current-Limit Threshold

(Positive, Adjustable)

GND - CS_

(MAX8732/MAX8733),

GND - LX_ (MAX8734)

185

200

215

mV

Zero-Current Threshold

(MAX8732/MAX8733), GND - LX_ (MAX8734)

3mV

Current-Limit Threshold

(Negative, Default)

GND - LX_ (MAX8734)

-120

mV

Soft-Start Ramp Time

Zero to full limit

1.7

ms