MAX8732 データシートの表示（PDF） - Maxim Integrated

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MAX8732

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

Maxim Integrated 

High-Efficiency, Quad-Output, Main Power-

Supply Controllers for Notebook Computers

ELECTRICAL CHARACTERISTICS (continued)

(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

CONDITIONS

MIN TYP MAX UNITS

OUT3, OUT5 Discharge-Mode

On-Resistance

12

40

Ω

OUT3, OUT5 Discharge-Mode

Synchronous Rectifier

Turn-On Level

0.2

0.3

0.4

V

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

PARAMETER

MAIN SMPS CONTROLLERS

V+ Input Voltage Range

3.3V Output Voltage in

Fixed Mode

CONDITIONS

LDO5 in regulation

V+ = LDO5, VOUT5 < 4.41V

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

MIN TYP MAX UNITS

6

24

V

4.5

5.5

3.27

3.39

V

5V Output Voltage in Fixed Mode

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

MAX8732/MAX8734 (TON = VCC)

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

MAX8733/MAX8734 (TON = GND)

4.95

5.15

V

Output Voltage in

Adjustable Mode

Output Voltage Adjust Range

V+ = 6V to 24V, either SMPS

Either SMPS

1.97

2.03

V

2.0

5.5

V

FB3, FB5 Adjustable-Mode

Threshold Voltage

Dual-Mode comparator

0.1

0.2

V

Current-Limit Threshold

(Positive, Default)

ILIM_ = VCC, GND - CS_ (MAX8732/MAX8733),

GND - LX_ (MAX8734)

Current-Limit Threshold

(Positive, Adjustable)

On-Time Pulse Width

Minimum Off-Time

GND - CS_

(MAX8732/MAX8733),

GND - LX_ (MAX8734)

MAX8732 or MAX8734

(VTON = 5V)

MAX8733 or MAX8734

(VTON = 0)

VILIM_ = 0.5V

VILIM_ = 1V

VILIM_ = 2V

VOUT5 = 5.05V

VOUT3 = 3.33V

VOUT5 = 5.05V

VOUT3 = 3.33V

INTERNAL REGULATOR AND REFERENCE

LDO5 Output Voltage

ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO5 < 100mA

LDO5 Undervoltage-Lockout

Fault Threshold

Falling edge of LDO5, hysteresis = 1%

90

40

90

180

1.895

0.833

0.895

0.475

200

4.90

3.7

110

mV

60

110

mV

220

2.315

1.017

µs

1.209

0.635

400

ns

5.10

V

4.3

V

_______________________________________________________________________________________ 5

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