MAX8742 datasheet(3/33 Pages) MAXIM

Part #	MAX8742

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

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Manufacturer	MAXIM [Maxim Integrated Products]

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500kHz Multi-Output Power-Supply Controllers

with High Impedance in Shutdown

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

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

values are at TA = +25°C.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SYNC = VL

95

97

Maximum Duty Factor

SYNC = 0 (Note 2)

96.5

98

%

SYNC Input High Pulse Width

Not tested

200

ns

SYNC Input Low Pulse Width

Not tested

200

ns

SYNC Rise/Fall Time

Not tested

200

ns

SYNC Input-Frequency Range

400

583

kHz

Current-Sense Input Leakage Current

V+ = VL = 0,

CSL3 = CSH3 = CSL5 = CSH5 = 5.5V

0.01

10

µA

FLYBACK CONTROLLER

VDD Regulation Threshold

Falling edge (MAX8742)

13

14

V

SECFB Regulation Threshold

Falling edge (MAX8741)

2.44

2.60

V

DL Pulse Width

VDD < 13V or SECFB < 2.44V

0.75

µs

VDD Shunt Threshold

Rising edge, hysteresis = 1% (MAX8742)

18

20

V

VDD Shunt Sink Current

VDD = 20V (MAX8742)

10

mA

VDD Leakage Current

VDD = 5V, off mode (Note 3)

30

µA

12V LINEAR REGULATOR (MAX8742)

12OUT Output Voltage

13V < VDD < 18V, 0 < ILOAD < 120mA

11.65

12.10

12.50

V

12OUT Current Limit

12OUT forced to 11V, VDD = 13V

150

mA

Quiescent VDD Current

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

50

100

µA

INTERNAL REGULATOR AND REFERENCE

VL Output Voltage

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

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

4.7

5.1

V

VL Undervoltage-Lockout Fault Threshold

Falling edge, hysteresis = 1%

3.5

3.6

3.7

V

VL Switchover Threshold

Rising edge of CSL5, hysteresis = 1%

4.2

4.5

4.7

V

REF Output Voltage

No external load (Note 4)

2.45

2.5

2.55

V

0 < ILOAD < 50µA

12.5

REF Load Regulation

0 < ILOAD < 5mA

100.0

mV

REF Sink Current

10

µA

REF Fault-Lockout Voltage

Falling edge

1.8

2.4

V

V+ Operating Supply Current

VL switched over to CSL5, 5V SMPS on

5

50

µA

V+ Standby Supply Current

V+ = 5.5V to 30V, both SMPSs off, includes

current into SHDN

30

60

µA

V+ Standby Supply Current in Dropout

V+ = 4.2V to 5.5V, both SMPSs off, includes

current into SHDN

50

200

µA

V+ Shutdown Supply Current

V+ = 4.0V to 30V, SHDN = 0

4

10

µA

MAX8742

2.5

4

Quiescent Power Consumption

Both SMPSs enabled,

FB3 = FB5 = 0,

CSL3 = CSH3 = 3.5V,

CSL5 = CSH5 = 5.3V

MAX8741

1.5

4

mW

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