3A Bus Terminator Regulator
AP1127
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
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
Applications
- Mother Board
- PCI/AGP Graphics
- Game/Play Station
- Set Top Box
- SCSI-III Bus Terminator
- IPC
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.
Pin Assignment
5
3
1V
IN
V
OUT
GND
TO252-5L
( Top View )
2
4
VCCA
REFEN
Pin Descriptions
Pin
Name
Pin
No. Descriptions
VIN 1 Input Power
VOUT 2 Output Voltage
GND 3 Ground
REFEN 4 Reference Voltage Input and Chip
Enable
VCCA 5 Voltage Supply for Internal Circuits
Ordering Information
AP1127 X X
Package
D: TO252-5L
Packing
Blank : Tube
A : Taping
3A Bus Terminator Regulator
AP1127
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jan 17, 2005
2/4
Typical Circuit
V
OUT
VCCA
GND
V
IN
REFEN
C
VCCA
10uF
C
IN
470uF
C
OUT
200uF
V
OUT
R1
R2
100K
100K
CSS
1uF
Q1
EN
V
IN
VCCA
Block Diagram
Control
VIN
Current Limit
Protection
Thermal
+
-
REFEN
VCCA
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
TSTG Storage Temperature -65 to 125 oC
TLead Lead Temperature (Soldering, 5 sec) 260 oC
θJC Thermal Resistance 7.7 oC/W
3A Bus Terminator Regulator
AP1127
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jan 17, 2005
3/4
Electrical Characteristics
Unless otherwise stated, these specifications apply TA=25oC; 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)
Symbol Parameter Conditions Min. Typ. Max. Unit
VOS Output Offset Voltage IOUT=0A (Note 2) -20 - 20 mV
IOP Operating Current at VIN No load, COUT=200uF - - 1 mA
IL: 0A~3A - 0.8/1.2 2/3
∣∆VLOAD∣ Load Regulation (DDR I/II) IL: 0A~3A - 0.8/1.2 2/3 %
ICCQ Quiescent Current at VCCA At room temp. - 190 230 µA
ISHDN Current in Shutdown Mode REFEN < 0.2V,
RL=10Ω - 90 110 µA
VIN Input Voltage Range (Note 3) No load 1.35/1 2.5/1.8 6 V
VCCA Input Voltage Range (Note 3) R
L=10Ω 3.75 - 6 V
Short Circuit Protection
ILIMIT Current Limit - 5 - A
ISC, VIN Short Current Sinking 2 - - A
ISC, GND Short Current Sourcing 3 - - A
Over Thermal Protection
THSD Thermal Shutdown Temperature 3.75V ≤ VCCA ≤ 6V 125 150 - oC
Thermal Shutdown Hysteresis 25 30 35
oC
REFEN Function
REFEN Threshold VREFEN < VIN
VREFEN < VCCA-2.5V 0.4 0.5 0.6 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.
3A Bus Terminator Regulator
AP1127
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jan 17, 2005
4/4
Marking Information
TO252-5L
1127
Part Number
Logo
ID Code
Xth Week: 01~52
Year:
(Top view)
"02" = 2002
"01" = 2001
X X X X X
~
Package Information
B
A
G
S
M
D
H
J
5.6
11.0
5.6
2.0
1.27
Land Pattern Recommendation (Unit: mm)
7.2
0.6
P(TYP.)
C
K
L
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 6.35 6.60 6.85 0.250 0.260 0.270
B 5.20 5.35 5.50 0.205 0.211 0.217
C 6.80 7.00 7.30 0.268 0.276 0.287
D 2.20 2.50 2.80 0.087 0.098 0.110
P 1.27 REF. 0.050 REF.
S 0.50 0.65 0.80 0.020 0.026 0.031
G 0.40 0.50 0.63 0.016 0.020 0.025
H 2.20 2.30 2.40 0.087 0.091 0.094
J 0.45 0.52 0.58 0.018 0.020 0.023
K 0.00 0.08 0.15 0.000 0.003 0.006
L 0.90 1.20 1.63 0.035 0.047 0.064
M 5.40 5.80 6.20 0.213 0.228 0.244
