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MAX5953A Datasheet(PDF) 4 Page - Maxim Integrated Products

Part No. MAX5953A
Description  IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX5953A Datasheet(HTML) 4 Page - Maxim Integrated Products

 
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IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (DC-DC Controller)
(All voltages referenced to GND, unless otherwise noted. VHVIN = +48V, CINBIAS = 1µF, CREGOUT = 2.2µF, RRTCT = 25kΩ, CRTCT =
100pF, CBST = 0.22µF, VCSS = VCS = 0V, VRAMP = VDCUVLO = 3V, TJ = 0°C to +125°C, unless otherwise noted. Typical values are at
TJ = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply Range
VHVIN
11
76
V
OSCILLATOR (RTCT)
PWM Frequency
fS
250
kHz
Maximum PWM Duty Cycle
DMAX
47
%
Maximum RTCT Frequency
fRTCTMAX
(Note 12)
1
MHz
RTCT Peak Trip Level
VTH,RTCT
0.51 x VREGOUT
V
RTCT Valley Trip Level
VTL,RTCT
1V
RTCT Input Bias Current
IIN,RTCT
±1
µA
RTCT Discharge MOSFET
RDS(ON)
RDIS,RTCT
Sinking 50mA
35
85
RTCT Discharge Pulse Width
50
ns
LOOK-AHEAD LOGIC (PPWM)
PPWM to Output Propagation
Delay
tPPWM
VPPWM rising to VXFRMRL falling
110
ns
PPWM Output High
VOH,PPWM
Sourcing 2mA
7.0
11.0
V
PPWM Output Low
VOL,PPWM
Sinking 2mA
0.2
V
PWM COMPARATOR (OPTO, RAMP, RCFF)
Common-Mode Input Range
VCM_PWM
0
5.5
V
Input Offset Voltage
10
mV
Input Bias Current
-2
+2
µA
RAMP to XFRMRL Propagation
Delay
tCOMPARATOR
From VRAMP (50mV overdrive) rising to
VXFRMRL rising
100
ns
Minimum OPTO Voltage
VCSS = 0V, OPTO sinking 2mA
1.47
V
Minimum RCFF Voltage
RCFF sinking 2mA
2.18
V
REGOUT LDO (REGOUT)
INBIAS unconnected,
VHVIN = 11V to 76V
8.3
8.75
9.2
REGOUT Voltage Set Point
VREGOUT
VINBIAS = VHVIN = 11V to 76V
9.5
10.6
11.0
V
INBIAS unconnected, VHVIN = 15V,
IREGOUT = 0 to 30mA
0.25
REGOUT Load Regulation
VINBIAS = VHVIN = 15V,
IREGOUT = 0 to 30mA
0.25
V
INBIAS unconnected, IREGOUT = 30mA
1.25
REGOUT Dropout Voltage
VINBIAS = VHVIN, IREGOUT = 30mA
1.25
V
REGOUT Undervoltage
Lockout Threshold
REGOUT rising
6.6
7.0
7.4
V
REGOUT Undervoltage
Lockout Threshold Hysteresis
REGOUT falling
0.7
V


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