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MAX8741
(Rev.:2004)

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 (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

FAULT DETECTION

Overvoltage Trip Threshold

CONDITIONS

With respect to unloaded output voltage

MIN TYP MAX UNITS

4

7

10

%

Overvoltage Fault Propagation Delay

CSL_ driven 2% above overvoltage trip

threshold

1.5

µs

Output Undervoltage Threshold

With respect to unloaded output voltage

60

70

80

%

Output Undervoltage-Lockout Time

Thermal-Shutdown Threshold

RESET

From each SMPS enabled, with respect to

fOSC

Typical hysteresis = 10°C

3300 4096 4700 Clks

+150

°C

RESET Trip Threshold

With respect to unloaded output voltage,

falling edge; typical hysteresis = 1%

-7

-5.5

-4

%

RESET Propagation Delay

RESET Delay Time

INPUTS AND OUTPUTS

Feedback-Input Leakage Current

Logic Input-Low Voltage

Falling edge, CSL_ driven 2% below RESET

1.5

µs

trip threshold

With respect to fOSC

27,000 32,000 37,000 Clks

FB3, FB5; SECFB = 2.6V

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

1

50

nA

0.6

V

Logic Input-High Voltage

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

2.4

V

Input Leakage Current

Logic Output-Low Voltage

Logic Output-High Current

TIME/ON5 Input Trip Level

TIME/ON5 Source Current

TIME/ON5 On-Resistance

Gate-Driver Sink/Source Current

Gate-Driver On-Resistance

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC, SEQ; VPIN = 0V or 3.3V

±1

µA

RESET, ISINK = 4mA

RESET = 3.5V

0.4

V

1

mA

SEQ = 0 or VL

2.4

2.6

V

TIME/ON5 = 0, SEQ = 0 or VL

2.5

3

3.5

µA

TIME/ON5; RUN/ON3 = 0, SEQ = 0 or VL

15

80

Ω

DL3, DH3, DL5, DH5; forced to 2V

1

A

High or low (Note 5)

SSOP package

QFN package

1.5

7

Ω

1.5

8

4 _______________________________________________________________________________________

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