APL5331_08 Datasheet, PDF (1/23 Pages) Anpec Electronics Coropration – 3A Bus Termination Regulator

APL5331
3A Bus Termination Regulator
Features
General Description
• Provide Bi-direction Current
- Sourcing or Sinking Current up to 3A
• 1.25V/0.9V Output for DDR I/II Applications
• Fast Transient Response
• High Output Accuracy
- ±20mV over Load, VOUT Offset and Temperature
• Adjustable Output Voltage by External Resistors
• Current-Limit Protection
• On-Chip Thermal Shutdown
• Shutdown for Standby or Suspend Mode
• Simple SOP-8, SOP-8P with thermal pad,
TO-252-5 and TO-263-5 Packages
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• DDR I/II SDRAM Termination
• SSTL-2/3 Termination Voltage
• Applications Requiring the Regulator with
Bi-directional 3A Current Capability
The APL5331 linear regulator is designed to provide a
regulated voltage with bi-directional output current for
DDR-SDRAM termination voltage. The APL5331 inte-
grates two power transistors to source or sink current
up to 3A. It also incorporates current-limit, thermal shut-
down and shutdown control functions into a single chip.
The current-limit circuit limits the short-circuit current.
The on-chip thermal shutdown provides protection
against any combination of overload that would create
excessive junction temperature. The output voltage of
APL5331 tracks the voltage at VREF pin. A resistor di-
vider connected to VIN, GND and VREF pins is used to
provide a half voltage of VIN to VREF pin. In addition, an
external ceramic capacitor and an open-drain tran-
sistor connected to VREF pin provide soft-start and shut-
down control respectively. Pulling and holding the VREF
voltage to 0V shuts off the output. The output of the
APL5331 will be high impedance in shutdown condition.
Pin Configuration
VIN 1
GND 2
VREF 3
VOUT 4
8 VCNTL
7 VCNTL
6 VCNTL
5 VCNTL
SOP-8 (Top View)
VOUT
TAB is VCNTL
VREF
VCNTL
GND
VIN
TO-252-5 (Top View)
VIN 1
GND 2
VREF 3
VOUT ₄
8 NC
7 NC
6 VCNTL
5 NC
SOP-8P (Top View)
NC = No internal connection
5
4
TAB is VCNTL
3
2
1
TO-263-5 (Top View)
VOUT
VREF
VCNTL
GND
VIN
= Thermal Pad (connected to GND plane for better heat dissipation)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
1
Rev. B.4 - Mar., 2008
www.anpec.com.tw