MAX5942BCSE Maxim Integrated, MAX5942BCSE Datasheet - Page 5

• Manufacturer Part Number: MAX5942BCSE
• Description: Power Switch ICs - POE / LAN
• Manufacturer: Maxim Integrated

ELECTRICAL CHARACTERISTICS (PWM Controller) (continued)
(All voltages referenced to V-. V
SS_SHDN, NDRV = open circuit, V
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10: PGOOD references to OUT while PGOOD references to V
Note 11: Guaranteed by design.
SOFT-START
SS Source Current
SS Sink Current
Peak Soft-Start Voltage Clamp
Shutdown Threshold
All min/max limits for the PD interface are production tested at +85°C (extended grade)/+70°C (commercial grade). Limits
at +25°C and -40°C are guaranteed by design. All PWM controller min/max limits are 100% production tested at +25°C
and +85°C (extended grade)/+70°C (commercial grade). Limits at -40°C are guaranteed by design, unless otherwise
noted.
The input offset current is illustrated in Figure 1.
Effective differential input resistance is defined as the differential resistance between GND and V
resistance.
Classification current is turned off whenever the IC is in power mode.
See Table 2 in the PD Classification Mode section. R
See Thermal Dissipation section for details.
When UVLO is connected to the midpoint of an external resistor-divider with a series resistance of 25.5kΩ (±1%), the turn-
on threshold set point for the power mode is defined by the external resistor-divider. Make sure the voltage on the UVLO
pin does not exceed its maximum rating of 8V when V
When the V
An input voltage or V
MAX5942A/MAX5942B to exit power-on mode (as long as the input voltage remains above an operable voltage level of 12V).
PARAMETER
Interface/PWM Controller for Power Devices
_______________________________________________________________________________________
UVLO
is below V
DD
UVLO
FB
= 13V, a 10µF capacitor connects V
Figure 1. Effective Differential Input Resistance/Offset Current
= 3V, T
TH, G, UVLO,
SYMBOL
glitch below their respective thresholds shorter than or equal to t
I
OFFSET
IEEE 802.3af Power-Over-Ethernet
I
SSO
I
INi
I
+1
INi
A
I
IN
= T
the MAX5942_ sets the turn-on voltage threshold internally (V
MIN
V
No external load
V
V
I
OFFSET
SS_SHDN
SS_SHDN
SS_SHDN
dR
to T
i
≅
≅ I
(V
(I
INi
MAX
INi + 1
INi + 1
-
V
dR
= V-
falling (Note 11)
rising (Note 11)
INi
, unless otherwise noted. Typical values are at T
i
- V
- I
DISC
INi
INi
IN
CONDITIONS
V
)
INi
)
is at the maximum voltage.
=
(I
and R
EE
INi + 1
.
1V
1V
CC
- I
CL
dR
INi
V
to V-, V
i
)
INi
must be 100ppm or better.
+1
CS
= V-, V+ = 48V, 0.1µF capacitor connected to
2.331
0.25
0.53
MIN
2.0
1
OFF_DLY
2.420
TYP
0.37
0.59
4.5
UVLO,ON
A
EE
= +25°C.) (Note 1)
without any external
will not cause the
2.500
MAX
0.41
0.65
6.5
).
UNITS
mA
µA
V
V
5