MAX5941 datasheet(3/24 Pages) MAXIM

Part #	MAX5941

Description	IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices

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Manufacturer	MAXIM [Maxim Integrated Products]

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IEEE 802.3af-Compliant Power-Over-Ethernet

Interface/PWM Controller for Power Devices

_______________________________________________________________________________________

3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

UVLO External Reference Voltage

Hysteresis

HYST

Ratio to VREF,UVLO

19.2

20

20.9

%

UVLO Bias Current

IUVLO

UVLO = 2.460V

-1.5

+1.5

µA

UVLO Input Ground Sense

Threshold

VTH,G,UVLO (Note 8)

50

440

mV

UVLO Input Ground Sense Glitch

Rejection

UVLO = VEE

7µs

Power Turn-Off Voltage,

Undervoltage Lockout Deglitch

Time

tOFF_DLY

VIN, VUVLO falling (Note 9)

0.32

ms

TA = +25°C

(Note 11)

0.6

1.1

Isolation Switch N-Channel

MOSFET On-Resistance

RON

Output current =

300mA, VGATE = 5.6V,

measured between

OUT and VEE

TA = +85°C

0.8

1.5

Ω

Isolation Switch N-Channel

MOSFET Off-Threshold Voltage

VGSTH

OUT = GND, VGATE - VEE, output current

< 1µA

0.5

V

GATE Pulldown Switch Resistance

RG

Power-off mode, VIN = 12V, UVLO = VEE

38

80

Ω

GATE Charging Current

IG

VGATE = 2V

5

10

15

µA

GATE High Voltage

VGATE

IGATE = 1µA

5.58

5.76

5.93

V

VOUT - VEE, |VOUT - VEE| decreasing,

VGATE = 5.75V

1.15

1.23

1.31

V

PGOOD, PGOOD Assertion VOUT

Threshold

VOUTEN

Hysteresis

70

mV

(GATE - VEE) increasing, OUT = VEE

4.62

4.76

4.91

V

PGOOD, PGOOD Assertion VGATE

Threshold

VGSEN

Hysteresis

80

mV

PGOOD Output Low Voltage

ISINK = 2mA (Note 10)

0.4

V

PGOOD Output Low Voltage

VOLDCDC

ISINK = 2mA, OUT ≤ (GND - 5V) (Note 10)

0.2

V

PGOOD Leakage Current

GATE = high, GND - VOUT = 67V (Note 10)

1

µA

PGOOD Leakage Current

GATE = VEE, PGOOD - VEE = 67V (Note 10)

1

µA

ELECTRICAL CHARACTERISTICS (continued)

(VIN = (GND - VEE) = 48V, GATE = PGOOD = PGOOD = OPEN, V- tied to OUT, V+ tied to GND, UVLO = VEE, TA = TMIN to +TMAX,

unless otherwise noted. Typical values are at TA = +25

°C. All voltages are referenced to VEE, unless otherwise noted.) (Note 1)

ELECTRICAL CHARACTERISTICS (PWM Controller)

(All voltages referenced to V-. VDD = 13V, a 10µF capacitor connects VCC to V-, VCS = V-, V+ = 48V, 0.1µF capacitor connected to

SS_SHDN, NDRV = open circuit, OPTO = V-, TA = TMIN to +TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SUPPLY CURRENT

IV+(NS)

VDD = 0V, V+ = 67V, driver not switching

0.85

1.3

V+ Supply Current

IV+(S)

V+ = 67V, VDD = 0V, VOPTO = 4V, driver

switching

1.4

2.6

mA

V+ Supply Current After Startup

V+ = 67V, VDD = 13V, VOPTO = 4V

11

µA

IVDD(NS)

VDD = 36V, driver not switching

0.9

1.3

VDD Supply Current

IVDD(S)

VDD = 36V, driver switching, VOPTO = 4V

1.9

2.7

mA

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