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PDF MAX5971B Data sheet ( Hoja de datos )
| Número de pieza | MAX5971B | |
| Descripción | PSE Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-5336; Rev 0; 6/10
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I2C
General Description
The MAX5971B is a single-port power controller designed
for use in IEEEM 802.3af/at-compliant power-sourcing
equipment (PSE). This device provides powered device
(PD) discovery, classification, current limit, and DC and
AC load-disconnect detections. The MAX5971B sup-
ports both fully automatic operation and software pro-
grammability, and features an integrated power MOSFET
and sense resistor. The device supports detection and
classification operation from a single 54V supply. In
addition, it supports 2-event classification and new Class
5 classification of high-power PDs. The MAX5971B pro-
vides up to 40W to a single port (Class 5 enabled) and
still provides high-capacitance detection for legacy PDs.
The device provides four operating modes to suit differ-
ent system requirements. By default, auto mode allows
the device to operate automatically at its default settings
without any software. Semiautomatic mode automatically
detects and classifies a device connected to the port
after initial software activation, but does not power the
port until instructed to by software. Manual mode allows
total software control of the device and is useful for
system diagnostics. Shutdown mode terminates all port
activities and securely turns off power to the port.
The IC features an I2C-compatible, 2-wire serial inter-
face, and is fully software-configurable and program-
mable. The device provides instantaneous readout of
port current through the I2C interface. The device’s
extensive programmability enhances system flexibility,
enables field diagnosis and allows for uses in other, non
standard applications.
The device provides input undervoltage lockout (UVLO),
input undervoltage detection, input overvoltage lockout,
overtemperature protection, output voltage slew-rate limit
during startup, and LED status indication. The MAX5971B
programmability includes startup timeout, overcurrent
timeout, and load-disconnect detection timeout.
The device is available in a space-saving, 28-pin TQFN
(5mm x 5mm) power package and is rated for the
extended (-40NC to +85NC) temperature range.
Applications
Single-Port PSE End-Point Applications
Single-Port PSE Power Injectors (Midspan Applications)
Switches/Routers
Features
S IEEE 802.3af/at Compliant
S Up to 40W for Single-Port PSE Applications
S Integrated Power MOSFET and Sense Resistor
S Supports 54V Single-Supply Operation
S PD Detection and Classification
S I2C-Compatible, 2-Wire Serial Interface
S Instantaneous Readout of Port Current Through
I2C Interface
S Programmable Current Limit for Class 5 PDs
S High-Capacitance Detection for Legacy Devices
S Supports Both DC and AC Load Removal
Detections
S Current Foldback and Duty-Cycle-Controlled
Current Limit
S LED Indicator for Port Status
S Direct Fast-Shutdown Control Capability
S Space-Saving, 28-Pin TQFN (5mm x 5mm) Power
Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5971BETI+
-40NC to +85NC
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
-54V
VEE
AGND
OUT
VEE_DIG
OUTP
LED
PWMEN MAX5971B
LEGACY
DET
MIDSPAN
ILIM1
OSC ILIM2
EN
SDA SCL AD0 INT
PSE OUTPUT
SERIAL INTERFACE
IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I2C
ELECTRICAL CHARACTERISTICS (continued)
(VAGND - VEE = 32V to 60V, TA = -40NC to +85NC, all voltages are referenced to VEE, unless otherwise noted. Typical values are at
VAGND - VEE = +54V, TA = +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2)
PARAMETER
Classification Current Thresholds
SYMBOL
ICL
CONDITIONS
Class 0, Class 1
Classification current
thresholds between
classes
Class 1, Class 2
Class 2, Class 3
Class 3, Class 4
Class 4 upper limit
(Note 7)
MIN
5.5
13.0
21
31
45
TYP
6.5
14.5
23
33
48
MAX
7.5
16.0
25
35
51
UNITS
mA
Mark Event Voltage
Mark Event Current Limit
VMARK
IMARK_LIM
VAGND - VDET during mark event
VDET = VAGND during mark event measure
current through DET
8
55
10 V
80 mA
DIGITAL INPUTS/OUTPUTS (Voltages Referenced to VEE)
Digital Input Low
VIL
0.8 V
Digital Input High
VIH
2.4 V
Internal Input Pullup Current
IPU
Pullup current to internal digital supply to
set default values
3
5
7
FA
Open-Drain Output Low Voltage
Open-Drain Leakage
LED Output Low Voltage
LED Output Leakage
PWM Frequency
PWM Duty Cycle
VOL
IOL
VLED_LOW
ILED_LEAK
ISINK = 10mA
Open-drain high impedance
ILED = 10mA, PWM disabled, port power-on
PWM disabled, shutdown mode,
VLED = 60V
25
6.25
0.4
2
0.8
10
V
FA
V
FA
kHz
%
TIMING
Startup Time
tSTART
Time during which a current limit set to
420mA is allowed, starts when power is
turned on (Note 8)
50 60 70 ms
Fault Time
tFAULT
Maximum allowed time for an overcurrent
condition set by ICUT after startup (Note 8)
50
60
70
ms
Detection Reset Time
tME
Time allowed for the port voltage to reset
before detection starts
80 90 ms
Detection Time
tDET
Maximum time allowed before detection is
completed
330 ms
Midspan Mode Detection Delay
Classification Time
Mark Event Time
tDMID
tCLASS
Time allowed for classification
Time allowed for mark event
2 2.2 2.4
s
19 23 ms
7 9 11 ms
VEEUVLO Turn-On Delay
tDLY
Time VAGND must be above the VEEUVLO
thresholds before the device operates
5.2
ms
Restart Timer
Watchdog Clock Period
tRESTART
Time the device waits before turning on
after an overcurrent fault (Note 8)
Rate of decrement of the watchdog time
16 x
tFAULT
164
ms
ms
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I2C
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
STARTUP USING 2-EVENT CLASSIFICATION
WITH A VALID PD
MAX5971B toc21
VAGND - VOUT
20V/div
0V
IOUT
100mA/div
0mA
100ms/div
LED DETECTION FAULT WITH PWM ENABLED
MAX5971B toc22a
VAGND - VOUT
0V 10V/div
0mA
IOUT
500mA/div
VAGND - VLED
20V/div
0V
200ms/div
LED DETECTION FAULT WITH PWM DISABLED
MAX5971B toc22b
LED OVERCURRENT FAULT WITH PWM ENABLED
MAX5971B toc23a
LED OVERCURRENT FAULT WITH PWM DISABLED
MAX5971B toc23b
VAGND - VOUT
VAGND - VOUT
VAGND - VOUT
0V
10V/div
0V
50V/div
0V
50V/div
0mA
IOUT
500mA/div
0mA
IOUT
500mA/div
0mA
IOUT
500mA/div
VAGND - VLED
20V/div
VAGND - VLED
20V/div
VAGND - VLED
20V/div
0V
200ms/div
0V
200ms/div
0V
200ms/div
LED PWM TIMING: MINIMUM DUTY
CYCLE (DEFAULT)
MAX5971B toc24a
VAGND - VOUT
50V/div
OV
IOUT
OmA 500mA /div
LED PWM TIMING: MAXIMUM DUTY
CYCLE (PROGRAMMABLE)
MAX5971B toc24b
VAGND - VOUT
50V/div
OV
IOUT
OmA 500mA /div
VAGND - VLED
20V/div
OV
10µs/div
VAGND - VLED
20V/div
OV
10µs/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 46 Páginas | |
| PDF Descargar | [ Datasheet MAX5971B.PDF ] | |
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