MAX5953A MAXIM [Maxim Integrated Products], MAX5953A Datasheet - Page 4

• 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)
(All voltages referenced to GND, unless otherwise noted. V
100pF, C
T
4
Input Supply Range
OSCILLATOR (RTCT)
PWM Frequency
Maximum PWM Duty Cycle
Maximum RTCT Frequency
RTCT Peak Trip Level
RTCT Valley Trip Level
RTCT Input Bias Current
RTCT Discharge MOSFET
R
RTCT Discharge Pulse Width
LOOK-AHEAD LOGIC (PPWM)
PPWM to Output Propagation
Delay
PPWM Output High
PPWM Output Low
PWM COMPARATOR (OPTO, RAMP, RCFF)
Common-Mode Input Range
Input Offset Voltage
Input Bias Current
RAMP to XFRMRL Propagation
Delay
Minimum OPTO Voltage
Minimum RCFF Voltage
REGOUT LDO (REGOUT)
REGOUT Voltage Set Point
REGOUT Load Regulation
REGOUT Dropout Voltage
REGOUT Undervoltage
Lockout Threshold
REGOUT Undervoltage
Lockout Threshold Hysteresis
J
DS(ON)
= +25°C, unless otherwise noted.) (Note 1)
_______________________________________________________________________________________
BST
PARAMETER
= 0.22µF, V
CSS
= V
CS
t
COMPARATOR
= 0V, V
V
V
R
V
SYMBOL
f
V
V
V
RTCTMAX
I
OH,PPWM
OL,PPWM
DIS,RTCT
CM_PWM
TH,RTCT
IN,RTCT
REGOUT
t
V
TL,RTCT
D
PPWM
HVIN
MAX
f
S
RAMP
= V
(Note 12)
Sinking 50mA
V
Sourcing 2mA
Sinking 2mA
From V
V
V
RCFF sinking 2mA
INBIAS unconnected,
V
V
INBIAS unconnected, V
I
V
I
INBIAS unconnected, I
V
REGOUT rising
REGOUT falling
REGOUT
REGOUT
PPWM
XFRMRL
CSS
HVIN
INBIAS
INBIAS
INBIAS
DCUVLO
= 0V, OPTO sinking 2mA
= 11V to 76V
RAMP
rising to V
= V
= V
= V
HVIN
= 0 to 30mA
= 0 to 30mA
rising
= 3V, T
HVIN
HVIN
HVIN
(50mV overdrive) rising to
= +48V, C
CONDITIONS
, I
= 11V to 76V
= 15V,
J
XFRMRL
REGOUT
= 0°C to +125°C, unless otherwise noted. Typical values are at
REGOUT
HVIN
INBIAS
falling
= 30mA
= 15V,
= 1µF, C
= 30mA
REGOUT
MIN
7.0
8.3
9.5
6.6
11
-2
0
= 2.2µF, R
0.51 x V
TYP
1.47
2.18
8.75
10.6
250
110
100
7.0
0.7
47
±1
35
50
10
1
1
REGOUT
RTCT
= 25kΩ, C
MAX
11.0
11.0
0.25
0.25
1.25
1.25
0.2
5.5
9.2
7.4
76
85
+2
UNITS
MHz
RTCT
kHz
mV
µA
µA
ns
ns
ns
%
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V
=