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MAX5987A Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # MAX5987A
Description  IEEE 802.3af-Compliant, High-Efficiency, Class 1,Powered Devices with Integrated DC-DC Converter
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX5987A Datasheet(HTML) 1 Page - Maxim Integrated Products

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MAX5986A/MAX5987A
IEEE 802.3af-Compliant, High-Efficiency, Class 1,
Powered Devices with Integrated DC-DC Converter
����������������������������������������������������������������� Maxim Integrated Products 1
19-6261; Rev 0; 4/12
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX5986A/MAX5987A.related.
IEEE is a registered service mark of the Institute of Electrical
and Electronics Engineers, Inc.
WiMAX is a registered certification mark and registered service
mark of WiMAX Forum.
General Description
The MAX5986A/MAX5987A provide a complete power-
supply solution as IEEE® 802.3af-compliant Class 1
Powered Devices (PDs) in a Power-over-Ethernet (PoE)
system. The MAX5986A/MAX5987A integrate the PD
interface with an efficient DC-DC converter, offering a low
external part count PD solution. The MAX5987A includes
a low-dropout regulator and the MAX5986A includes
sleep and ultra-low power modes.
The PD interface provides a detection signature and a
Class 1 classification signature with a single external
resistor. The PD interface also provides an isolation
power MOSFET, a 60mA (max) inrush current limit, and a
201mA (typ) operating current limit.
The integrated step-down DC-DC converter uses a peak
current-mode control scheme and provides an easy-to-
implement architecture with a fast transient response.
The step-down converter operates in a wide input volt-
age range from 8.7V to 60V and supports up to 3.84W
of input power at 1.15A load. The DC-DC converter
operates at a fixed 275kHz switching frequency, with an
efficiency-boosting frequency foldback that reduces the
switching frequency by half at light loads.
The devices feature an input undervoltage-lockout
(UVLO) with wide hysteresis and long deglitch time to
compensate for twisted-pair cable resistive drop and to
assure glitch-free transition during power-on/-off condi-
tions. The devices also feature overtemperature shut-
down, short-circuit protection, output overvoltage protec-
tion, and hiccup current limit for enhanced performance
and reliability.
The MAX5986A/MAX5987A are available in a 16-pin,
5mm x 5mm, TQFN power package and operate over the
-40°C to +85°C temperature range.
Applications
IEEE 802.3af-Powered Devices
IP Phones
Wireless Access Nodes
IP Security Cameras
WiMAX® Base Stations
Benefits and Features
S
IEEE 802.3af Compliant
S
PoE Class 1 Classification
S
Simplified Wall Adapter Interface
S
Efficient, Integrated DC-DC Converter (with
Integrated Switches)
S
8.7V to 60V Wide Input Voltage Range
S
3.0V to 5.6V Programmable Output Voltage Range
S
Internal Compensation
S
Fixed 275kHz Switching Frequency
S
Frequency Foldback for High-Efficiency Light-
Load Operation
S
Built-In Output-Voltage Monitoring
S
Open-Drain RESET Output (MAX5987A)
S
Protects Against Overload, Output Short Circuit,
Output Overvoltage, and Overtemperature
S
Hiccup-Mode Runaway Current Limit
S
Back-Bias Capability to Optimize the Efficiency
S
Integrated TVS Diode Withstands Cable Discharge
Event (CDE)
S
Internal LDO Regulator with Up to 100mA Load
(MAX5987A)
S
Fixed 3.3V or Adjustable Output Voltage Through
an External Resistive Divider
S
49mA (typ) Inrush Current Limit
S
Pass 2kV, 200m CAT-6 Cable Discharge Event
EVALUATION KIT AVAILABLE
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.


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