MAX5953A MAXIM [Maxim Integrated Products], MAX5953A Datasheet - Page 6

• Manufacturer Part Number: MAX5953A
• Description: IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs
• Manufacturer: MAXIM [Maxim Integrated Products]

IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
ELECTRICAL CHARACTERISTICS (DC-DC Controller) (continued)
(All voltages referenced to GND, unless otherwise noted. V
100pF, C
T
Note 1: Limits at 0°C are guaranteed by design, unless otherwise noted.
Note 2: The input offset current is illustrated in Figure 1.
Note 3: Effective differential input resistance is defined as the differential resistance between V+ and V
Note 4: Classification current is turned off whenever the IC is in power mode.
Note 5: See Table 2 in the Classification Mode section. R
Note 6: See the Thermal Dissipation section.
Note 7: When UVLO is connected to the midpoint of an external resistor-divider with a series resistance of 25.5kΩ (±1%), the turn-
Note 8: When V
Note 9: An input voltage or V
Note 10: Guaranteed by design, not tested in production for MAX5953B/MAX5953D.
Note 11: PGOOD references to OUT while PGOOD references to V
Note 12: Output switching frequency is
6
UNDERVOLTAGE LOCKOUT (DCUVLO)
Threshold Voltage
Hysteresis
Input Bias Current
SUPPLY CURRENT
Supply Current
Standby Supply Current
J
= +25°C, unless otherwise noted.) (Note 1)
_______________________________________________________________________________________
BST
PARAMETER
resistance.
bias current and the current drawn by R
on threshold set point for the power mode is defined by the external resistor-divider. Make sure the voltage on UVLO does
not exceed its maximum rating of 8V when V
MAX5953A/MAX5953B/MAX5953C/MAX5953D to exit power-on mode (as long as the input voltage remains above an
operable voltage level of 12V).
= 0.22µF, V
UVLO
is below V
CSS
= V
UVLO
CS
Figure 1. Effective Differential Input Resistance/Offset Current
TH,G,UVLO
V
V
= 0V, V
I
I
OFFSET
REF,DCUVLO
HYS,DCUVLO
glitch below their respective thresholds shorter than or equal to t
SYMBOL
IN,DCUVLO
I
INi + 1
1
I
INi
/
2
I
IN
RAMP
, the MAX5953A/MAX5953C set the turn-on voltage threshold internally (V
oscillator frequency.
I
OFFSET
= V
dR
DISC
V
V
From V
V
From V
V
From V
V
i
≅
≅ I
DCUVLO
DCUVLO
CSS
CSS
DCUVLO
DCUVLO
(V
(I
INi
.
IN
INi + 1
INi + 1
-
= 0V, V
= 0V, V
V
is at the maximum voltage.
dR
HVIN
INBIAS
HVIN
INi
DISC
i
- V
- I
HVIN
INi
rising
= 3V
= 0V
INi
= 3V, T
V
)
)
INi
= 11V to 76V,
= 76V, V
=
and R
INBIAS
HVIN
= +48V, C
(I
= 11V to 76V,
CONDITIONS
INi + 1
EE
1V
1V
J
= 76V
RCLASS
.
- I
= 0°C to +125°C, unless otherwise noted. Typical values are at
= 11V
dR
INi
OPIO
V
i
INi + 1
)
INBIAS
= 4V
must be 1%, 100ppm or better. I
= 1µF, C
V
IN
REGOUT
-100
MIN
1.14
= 2.2µF, R
OFF_DLY
EE
TYP
1.26
140
0.7
4.4
without any external
7
does not cause the
RTCT
CLASS
= 25kΩ, C
MAX
+100
1.38
1.5
6.4
includes the IC
UVLO,ON
1
UNITS
).
RTCT
mA
mA
mV
nA
V
=