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AP1127
3A Bus Terminator Regulator
Features
- Ideal for DDR-I and DDR-II - Source and sink up to 3A, no heat sink required - Integrated power MOSFETs - Programmable output voltage by external resistors - Output voltage could go down to 0.6V - Iccq at VCCA less than 500uA - Current limit protection and Short Circuit protection - Thermal shutdown protection - Shutdown for standby or suspend mode operation - Minimum external components - 5-Lead TO252 Pb-free Package
General Description
The AP1127 is a low cost linear regulator designed to provide a desired output voltage or termination voltage for various applications by converting voltage supplies ranging from 1.6V to 6.0V. The desired output voltage could be programmable by two external voltage divider resistors. The AP1127 is capable of sourcing or sinking up to 3A of current while regulating an output VOUT voltage to within 2% (DDR-I), 3%(DDR-II) or less. The AP1127 provides low profile 5-lead TO-252 package to save system space.
Applications
- Mother Board - PCI/AGP Graphics - Game/Play Station - Set Top Box - SCSI-III Bus Terminator - IPC
Pin Assignment
( Top View ) 5 4 3 2 1 TO252-5L VCCA REFEN GND VOUT VIN
Pin Descriptions
Pin Name VIN VOUT GND REFEN VCCA Pin No. 1 2 3 4 5 Descriptions Input Power Output Voltage Ground Reference Voltage Input and Chip Enable Voltage Supply for Internal Circuits
Ordering Information
AP1127 X X Package
D: TO252-5L
Packing
Blank : Tube A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
Rev.1.1 Jan 17, 2005 1/4
AP1127
3A Bus Terminator Regulator
Typical Circuit
VCCA VIN R1 100K VIN REFEN EN Q1 CSS R2 100K 1uF GND VCCA VOUT COUT 200uF CVCCA CIN 470uF 10uF VOUT
Block Diagram
VCCA VIN
Current Limit Protection REFEN Thermal
Control + -
VOUT
GND
Absolute Maximum Ratings (Note 1)
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Symbol Parameter Rating Unit VIN Supply Voltage 7 V VCCA Voltage Supply for internal circuits 7 V IOUT Output RMS Current, Source or Sink 3 A o TSTG Storage Temperature -65 to 125 C o TLead Lead Temperature (Soldering, 5 sec) 260 C o JC Thermal Resistance 7.7 C/W
Anachip Corp. www.anachip.com.tw 2/4
Rev.1.1 Jan 17, 2005
AP1127
3A Bus Terminator Regulator
Electrical Characteristics
Unless otherwise stated, these specifications apply TA=25 C; VIN=+2.5V and VCCA=+3.3V, VREFEN=1.25V) maximum ratings are stress ratings only and functional device operating is not implied. (Note 1)
o
Symbol VOS IOP VLOAD ICCQ ISHDN
Parameter Output Offset Voltage Operating Current at VIN Load Regulation (DDR I/II) Quiescent Current at VCCA Current in Shutdown Mode
VIN Input Voltage Range (Note 3) VCCA Input Voltage Range (Note 3) Short Circuit Protection ILIMIT Current Limit ISC, VIN Short Current ISC, GND Short Current Over Thermal Protection THSD Thermal Shutdown Temperature Thermal Shutdown Hysteresis REFEN Function REFEN Threshold
Conditions IOUT=0A (Note 2) No load, COUT=200uF IL: 0A~3A IL: 0A~3A At room temp. REFEN < 0.2V, RL=10 No load RL=10 Sinking Sourcing 3.75V VCCA 6V VREFEN < VIN VREFEN < VCCA-2.5V
Min. -20 1.35/1 3.75 2 3 125 25 0.4
Typ. 0.8/1.2 0.8/1.2 190 90 2.5/1.8 5 150 30 0.5
Max. 20 1 2/3 2/3 230 110 6 6 35 0.6
Unit mV mA % A A V V A A A
o o
C C
V
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions. Note 2: VOS=VREFEN-VOUT Note 3: Keep VCCA VIN and VCCA VREFEN + 2.5V on operation power on and power off sequences. Note 4: Guaranteed by design, not 100% test.
Function Description
The AP1127 is a linear regulator that is capable of sinking and sourcing 3A of current without an external heat sink. The AP1127 integrates power MOSFETs that are capable of source and sink 3A of current while maintaining excellent voltage regulation. The output voltage can be regulated within 3% or less by using the external feedback. Separate voltage supply inputs have been added to fit applications with various power supplies for the data bus and power buses. Outputs The output voltage pins (VOUT) are tied to the data bus, address, or clock lines via an external inductor. Output voltage is determined by the VIN. Inputs The input voltage pins (VIN) determine the output voltages (VOUT). At AP1127, the desired output voltage could be programmable by two external voltage divider resistors. VIN is suggested to connect to VDDQ of memory module for better tracking with memory VDDQ. Other Supply Voltages VCCA provide the voltage supply to the logic section and internal error amplifiers of AP1127.
Anachip Corp. www.anachip.com.tw 3/4
Rev.1.1 Jan 17, 2005
AP1127
3A Bus Terminator Regulator
Marking Information
TO252-5L
(Top view)
Logo Part Number
1127 XXXX X
ID Code Xth Week: 01~52 Year: "01" = 2001 "02" = 2002
~
Package Information
A B 5.6 5.6
C
11.0
M
D
2.0
7.2 1.27 0.6 L
P(TYP.) S
G
Land Pattern Recommendation (Unit: mm)
K
Symbol A B C D P S G H J K L M
Dimensions In Millimeters Min. Nom. Max. 6.35 6.60 6.85 5.20 5.35 5.50 6.80 7.00 7.30 2.20 2.50 2.80 1.27 REF. 0.50 0.65 0.80 0.40 0.50 0.63 2.20 2.30 2.40 0.45 0.52 0.58 0.00 0.08 0.15 0.90 1.20 1.63 5.40 5.80 6.20
Dimensions In Inches Min. Nom. Max. 0.250 0.260 0.270 0.205 0.211 0.217 0.268 0.276 0.287 0.087 0.098 0.110 0.050 REF. 0.020 0.026 0.031 0.016 0.020 0.025 0.087 0.091 0.094 0.018 0.020 0.023 0.000 0.003 0.006 0.035 0.047 0.064 0.213 0.228 0.244
Anachip Corp. www.anachip.com.tw 4/4
J
H
Rev.1.1 Jan 17, 2005

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