Anachip AP1127DA 3a bus terminator regulator Datasheet

AP1127
3A Bus Terminator Regulator
„ Features
„ General Description
- 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
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 Descriptions
„ Pin Assignment
( Top View )
5
VCCA
4
REFEN
3
GND
Pin
Name
VIN
VOUT
GND
Pin
No.
1
2
3
2
VOUT
REFEN
4
1
VIN
VCCA
5
Descriptions
Input Power
Output Voltage
Ground
Reference Voltage Input and Chip
Enable
Voltage Supply for Internal Circuits
TO252-5L
„ Ordering Information
AP1127 X X
Package
Packing
D: TO252-5L
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
VCCA
Q1
CSS
R2
100K 1uF
VOUT
VOUT
REFEN
EN
CVCCA
CIN
470uF 10uF
GND
COUT
200uF
„ Block Diagram
VCCA
Current Limit
Protection
VIN
Control
+
REFEN
-
VOUT
Thermal
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
θJC
Thermal Resistance
7.7
C/W
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Jan 17, 2005
2/4
AP1127
3A Bus Terminator Regulator
„ Electrical Characteristics
o
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)
Symbol
VOS
IOP
Parameter
Output Offset Voltage
Operating Current at VIN
∣∆VLOAD∣
Load Regulation (DDR I/II)
ICCQ
Quiescent Current at VCCA
ISHDN
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=10Ω
No load
RL=10Ω
Sinking
Sourcing
3.75V ≤ VCCA ≤ 6V
VREFEN < VIN
VREFEN < VCCA-2.5V
Min.
-20
-
Typ.
0.8/1.2
0.8/1.2
190
Max.
20
1
2/3
2/3
230
Unit
mV
mA
-
90
110
µA
1.35/1
3.75
2.5/1.8
-
6
6
V
V
2
3
5
-
-
A
A
A
125
25
150
30
35
0.4
0.5
0.6
%
µA
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.
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.
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.
Other Supply Voltages
VCCA provide the voltage supply to the logic section
and internal error amplifiers of AP1127.
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.
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Jan 17, 2005
3/4
AP1127
3A Bus Terminator Regulator
„ Marking Information
TO252-5L
(Top view)
Logo
1127
XXXX X
Part Number
ID Code
Xth Week: 01~52
Year: "01" = 2001
"02" = 2002
~
„ Package Information
5.6
A
7.2
D
2.0
M
11.0
C
5.6
B
P(TYP.)
G
1.27
0.6
Land Pattern Recommendation (Unit: mm)
L
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
Anachip Corp.
www.anachip.com.tw
J
H
K
S
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
Rev.1.1 Jan 17, 2005
4/4
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