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 Half-duplex with backpressure operation

 Supports 2 VLAN ID filtering, received VLAN Tag (4 bytes) can be stripped off or 

preserved MAC/PHY loop-back diagnostic capability

 Supports Suspend Mode and Remote Wakeup via Link-up, Magic packet, MS 

wakeup frame and external pin

 Optional PHY power down during Suspend Mode

 Optional MII interface in MAC mode allows AX88172A to work with external 

100BASE-FX Ethernet PHY or HomePNA PHY

 Optional Reverse-MII or Reverse-RMII interface in PHY mode allows AX88172A to 

work with external HomePlug PHY or glueless MAC-to-MAC connections

 Optional Reverse-MII interface in Dual-PHY mode allows AX88172A to act as an 

Ethernet PHY or USB 2.0 PHY for external MAC device that needs Ethernet and 
USB in system application

 Supports 256/512 bytes (93c56/93c66) of serial EEPROM (for storing USB 

Descriptors)

 Supports automatic loading of Ethernet ID, USB Descriptors and Adapter 

Configuration from EEPROM after power-on initialization

 Provides optional serial interface, I2C, SPI and UART

 Integrates on-chip voltage regulator and only requires a single 3.3V power supply

 12MHz and 25Mhz clock input from either crystal or oscillator source

 Integrates on-chip power-on reset circuit

The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA 
of  load  current.  It  has  the  same  pin-out  as  National  Semiconductor’s  industry  standard 
LM317.  The  LM1117  is  available  in  an  adjustable  version,  which  can  set  the  output 
voltage  from  1.25V  to  13.8V  with  only  two  external  resistors.  In  addition,  it  is  also 
available  in  five  fixed  voltages,  1.8V,  2.5V,  2.85V,  3.3V,  and  5V.  The  LM1117  offers 
current limiting and thermal shutdown. Its circuit includes a zener trimmed bandgap
reference  to  as-sure  output  voltage  accuracy  to  within  ±1%.  The  LM1117  series  is 
available  in  SOT- 223,  TO-220,  and  TO-252  D-PAK  packages.  A  minimum  of  10μF 
tantalum  capacitor  is  required  at  the  output  to  improve  the  transient  response  and 
stability.

 Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions

 Space Saving SOT-223 Package

 Current Limiting and Thermal Protection

 Output Current 800mA

 Line Regulation 0.2% (Max)

 Load Regulation 0.4% (Max)

 Temperature Range

 LM1117 0°C to 125°C

 LM1117I -40°C to 125°C

 2.85V Model for SCSI-2 Active Termination

 Post Regulator for Switching DC/DC Converter

 High Efficiency Linear Regulators 15

 32” TFT TV Service Manual 10/01/2005

 Battery Charger

 Battery Powered Instrumentation

         

The MP2012 is  a fully integrated, internally compensated 1.2MHz  fixed frequency PWM 
step-down  converter.  It is  ideal for  powering  portable  equipment that  runs from  a single 
cell  Lithium-Ion  (Li+)  Battery,  with  an  input  range  from  2.7V  to  6V.  The  MP2012  can 
provide up to 1.5A of load current with output voltage as low as 0.8V. It can also operate 
at  100%  duty  cycle  for  low  dropout  applications.  With  peak  current  mode  control  and 
internal compensation, the MP2012 is stable with ceramic capacitors and small inductors. 
Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown.

 2.7-6V Input Operation Range

 Output Adjustable from 0.8V to VIN

 1μA Max Shutdown Current.

 Up to 95% Efficiency

 100% Duty Cycle for Low Dropout

 Applications

 1.2MHz Fixed Switching Frequency

 Stable with Low ESR Output Ceramic

 Capacitors

 Thermal Shutdown

 Cycle-by-Cycle Over Current Protection

 Short Circuit Protection

 Available in 6-pin 3x3mm QFN

1

FB

Feedback input. An external resistor divider from 
the output to GND, tapped to the FB pin sets the 
output voltage.

2

GND, 

Exposed 

Pad

Ground pin. Connect exposed pad to ground 
plane for proper thermal performance.

3

SW

Switch node to the inductor.

4

PVIN

Input supply pin for power FET.

5

VIN

Input Supply pin for controller. Put small 
decoupling ceramic near this pin.

6

EN

Enable input, “High” enables MP2012. EN is 
pulled to GND with 1Meg internal resistor.

The  RT8283A  is  a  high-efficiency,  monolithic  synchronous  step-down  DC/DC  converter 
that can deliver up to 3A output current from a 4.5V to 23V input supply. The RT8283A's 
current mode architecture and external compensation allow the transient response to be 
optimized over a wide  range of loads and output capacitors. Cycle-by-cycle current limit 
provides  protection  against  shorted  outputs  and soft-start  eliminates  input  current  surge 
during start-up. The RT8283A also provides output under voltage protection and thermal 
shutdown protection. The low current (<3μA) shutdown mode provides output disconnect, 
enabling easy power management in batterypowered systems. The RT8283A is available 
in a SOP-8 package.