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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
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
T echcode®
Source and Sink 1.5A/2A Fast Transient Response Line Regulator
Ordering Information
DATASHEET
TD5860(A)
TD5860 □ □
Circuit Type Packing:
Blank:Tube
Blank:1.5A
R:Type and Reel
A:2A
Absolute Maximum Ratings
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device
at these or any other conditions above .