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TD5860A Datasheet Preview

TD5860A Datasheet

Source and Sink 1.5A/2A Fast Transient Response Line Regulator

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T  echcode®
DATASHEET
 
  Source and Sink 1.5A/2A Fast Transient Response Line Regulator TD5860(A)
 
General Description 
Features   
The TD5860/TD5860A linear regulator is designed to
provide a regulated voltage with bi-direction output
current for DDRSDRAM termination voltage. The
TD5860 integrates two power transistors to source or
sink load current up to 1.5A/2A. It also features internal
soft-start, current-limit, thermal shutdown and enable
control functions into a single chip.
The internal soft-start controls the rising rate of the
output voltage to prevent inrush current during start-up.
The current-limit circuit detects the output current and
limits the current during short-circuit or current overload
conditions. The on-chip thermal shutdown provides
thermal protection against any combination of overload
that would create excessive junction temperatures.
The output voltage of TD5860/TD5860A is regulated to
track the voltage on VREF pin. An proper resistor divider
connected to VIN, GND, and VREF pins is used to
provide a half voltage of VIN to VREF pin. In addition,
connect an external ceramic capacitor and a open-drain
transistor to VREF pin for external soft-start and
shutdown control.
Pulling and holding the voltage on VREF below the
enable voltage threshold shuts down the output. The
output of TD5860/TD5860A will be high impedance after
being shut down by VREF or the thermal shutdown
function. 
z Provide Bi-direction Output Currents
z Sourcing and Sinking Current up to 1.5A/2A Built-in
Soft-Start
z Power-On-Reset Monitoring on VCNTL and VIN
pins
z Fast Transient Response
z Stable with Ceramic Output Capacitors ±20mV High
System Output Accuracy over Load and
Temperature Ranges
z Adjustable Output Voltage by External Resistors
z Current-Limit Protection
z On-Chip Thermal Shutdown
z Shutdown for Standby or Suspend Mode
z SimpleSOP-8 with Exposed Pad(SOP8-PP)
Packages
z Lead Free and Green Devices Available(RoHS
Compliant)
Applications 
z DDRII/III SDRAM Termination Voltage
z Motherboard and VGA Card Power Supplies
z Setop Box
z SSTL-2/3 Termination Voltage
Package Types 
 
 
 
 
 
Figure 1. Package Types of TD6821 
Figure 1    Package Types of TD5860/TD5860A 
  
December,  20,  2005.                                                        Techcode  Semiconductor  Limited                                                  www.techcodesemi.com 
1 




Techcode

TD5860A Datasheet Preview

TD5860A Datasheet

Source and Sink 1.5A/2A Fast Transient Response Line Regulator

No Preview Available !

T  echcode®
DATASHEET
 
  Source and Sink 1.5A/2A Fast Transient Response Line Regulator TD5860(A)
 
Pin Configurations 
Pin Description 
  
Figure 2 Pin Configuration of TD5860/TD5860A (Top View) 
Pin Number Pin Name Description
1
2
3
4
5,7,8
6
Exposed Pin
VIN
GND
VREF
VOUT
NC
VCNTL
GND
Main Power Input Pin. Connect this pin to a voltage source and an input
capacitor. The TD5860/TD5860A sources current to VOUT pin by controlling the
upper pass MOSFET, providing a current path from VIN to VOUT.
Power and Signal Ground. Connect this pin to system ground plane with shortest
traces. The TD5860/TD5860A sinks current from VOUT pin by controlling the
lower pass MOSFET, providing a current path from VOUT to GND. This pin is
also the ground path for internal control circuitry.
Reference Voltage Input and Active-high Enable Control Pin. Apply a voltage to
this pin as a reference voltage for the TD5860/TD5860A. Connect this pin to a
resistor diver, between VIN and GND, and a capacitor for filtering noise purpose.
Applying and holding the voltage below the enable voltage threshold on this pin
by an open-drain transistor shuts down the output. During shutdown, the VOUT
pin has high input impedance.
I Output Pin of The Regulator. Connect this pin to load and output capacitors
(>8μF MLCC is necessary) required for stability and improving transient
response. The output voltage is regulated to track the reference voltage and
capable of sourcing or sinking current up to 1.5A/2A.
No Internal Connection.
Power Input Pin for Internal Control Circuitry. Connect this pin to a voltage
source, providing a bias for the internal control circuitry. A decoupling capacitor is
connected near this pin.
Chip Substrate Connection of The Chip. Connect this pad to system ground plane
for good thermal conductivity.
December,  20,  2005.                                                        Techcode  Semiconductor  Limited                                                  www.techcodesemi.com 
2 


Part Number TD5860A
Description Source and Sink 1.5A/2A Fast Transient Response Line Regulator
Maker Techcode
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