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MAX5953A Datasheet(PDF) 5 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) 5 Page - Maxim Integrated Products

 
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IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (DC-DC Controller) (continued)
(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
SOFT-START (CSS)
Soft-Start Current
ICSS
VCSS = 0V
33
µA
INTEGRATING FAULT PROTECTION
FLTINT Source Current
IFLTINT
80
µA
FLTINT Trip Point
VFLTINT rising
2.7
V
FLTINT Hysteresis
0.75
V
INTERNAL POWER FETs
On-Resistance
RON,POWER
VDRVIN = VBST = 9V,
VXFRMRH = VSRC = 0V, IDS = 50mA
0.4
0.8
Off-State Leakage Current
-5
+10
µA
Total Gate Charge Per Power
FET
15
nC
HIGH-SIDE DRIVER
Low to High Latency
tLH-HS
Driver delay until FET VGS reaches 0.9 x
(VBST - VXFRMRH) and is fully on
80
ns
High to Low Latency
tHL-HS
Driver delay until FET VGS reaches 0.1 x
(VBST - VXFRMRH) and is fully off
40
ns
Output Drive Voltage
VBST
BST to XFRMRH with high side on
8
V
LOW-SIDE DRIVER
Low to High Latency
tLH-LS
Driver delay until FET VGS reaches 0.9 x
VDRVIN and is fully on
80
ns
High to Low Latency
tHL-LS
Driver delay until FET VGS reaches 0.1 x
VDRVIN and is fully off
40
ns
CURRENT-LIMIT COMPARATOR (CS)
Current-Limit Threshold
Voltage
VILIM
140
156
172
mV
Current-Limit Input Bias
Current
IBILIM
0 < VCS < 0.3V
-2
+2
µA
Propagation Delay to XFRMRL
tdILIM
From VCS rising (10mV overdrive) to
VXFRMRL rising
160
ns
BOOST VOLTAGE CIRCUIT (See Figure 9, QB)
Driver Output Delay
tPPWMD
200
ns
One-Shot Pulse Width
tPWQB
300
ns
QB RDSON
Sinking 20mA
30
60
THERMAL SHUTDOWN
Shutdown Temperature
TSH
Temperature rising
+160
°C
Thermal Hysteresis
TH
20
°C


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