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MAX8742

500kHz Multi-Output Power-Supply Controllers with High Impedance in Shutdown

Maxim Integrated 

500kHz Multi-Output Power-Supply Controllers

with High Impedance in Shutdown

ELECTRICAL CHARACTERISTICS

(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0, REF load = 0, SKIP = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 6)

PARAMETER

MAIN SMPS CONTROLLERS

Input Voltage Range

3V Output Voltage in Adjustable Mode

CONDITIONS

V+ = 4.2V to 30V, CSH3 - CSL3 = 0,

CSL3 connected to FB3

MIN TYP MAX UNITS

4.2

30.0

V

2.42

2.58

V

3V Output Voltage in Fixed Mode

V+ = 4.2V to 30V, 0 < CSH3 - CSL3

3.20

< 80mV, FB3 = 0

3.47

V

5V Output Voltage in Adjustable Mode

V+ = 4.2V to 30V, CSH5 - CSL5 = 0,

CSL5 connected to FB5

2.42

2.58

V

5V Output Voltage in Fixed Mode

Output Voltage Adjust Range

Adjustable-Mode Threshold Voltage

Current-Limit Threshold

Oscillator Frequency

Maximum Duty Factor

SYNC Input Frequency Range

FLYBACK CONTROLLER

VDD Regulation Threshold

SECFB Regulation Threshold

VDD Shunt Threshold

VDD Shunt Sink Current

12V LINEAR REGULATOR (MAX8742)

12OUT Output Voltage

Quiescent VDD Current

INTERNAL REGULATOR AND REFERENCE

VL Output Voltage

VL Undervoltage-Lockout Fault Threshold

VL Switchover Threshold

REF Output Voltage

REF Load Regulation

REF Sink Current

REF Fault-Lockout Voltage

V+ Operating Supply Current

V+ = 5.3V to 30V, 0 < CSH5 - CSL5

< 80mV, FB5 = 0

Either SMPS

Dual-mode comparator

CSH3 - CSL3 or CSH5 - CSL5

SKIP = VL or VDD < 13V or SECFB < 2.44V

SYNC = VL

SYNC = 0

SYNC = VL

SYNC = 0 (Note 2)

Falling edge (MAX8742)

Falling edge (MAX8741)

Rising edge, hysteresis = 1% (MAX8742)

VDD = 20V (MAX8742)

13V < VDD < 18V, 0mA < ILOAD < 100mA

VDD = 18V, run mode, no 12OUT load

SHDN = V+, RUN/ON3 = TIME/ON5 = 0,

5.4V < V+ < 30V, 0 < ILOAD < 50mA

Falling edge, hysteresis = 1%

Rising edge of CSL5, hysteresis = 1%

No external load (Note 4)

0 < ILOAD < 50µA

0 < ILOAD < 5mA

Falling edge

VL switched over to CSL5, 5V SMPS on

4.85

REF

0.5

80

-50

450

283

95

97

400

13

2.44

18

10

11.65

4.7

3.5

4.2

2.45

10

1.8

5.25

V

5.5

V

1.1

V

120

mV

-150

550

kHz

383

%

583

kHz

14

V

2.60

V

20

V

mA

12.50

V

100

µA

5.1

V

3.7

V

4.7

V

2.55

V

12.5

mV

100.0

µA

2.4

V

50

µA

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