AP1250GM / AP1250GH

Advanced Power
Electronics Corp,
AP1250GM / AP1250GH
1.5A / 3A Bus Termination Regulator
Pb Free Plating Product
General Description
AP1250GM/H is a linear regulator designed as a cost-effective solution for active
termination of DDR SDRAM. The converting voltage range is from 1.6V to 6V into a
desired output voltage, which is adjusted by two external resistors. The current
sourcing and sinking capability of the regulator is up to 1.5A/3A while the output
voltage within 2%/3%.
This device provides on-chip thermal shutdown and current limit functions for circuit
tolerance of the output fault conditions. SO-8 and TO-252-5L packages are available
for all commercial and industrial surface mount applications.
Features
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Ideal for DDR-I and DDR-II applications
Capable of sourcing and sinking current 1.5A/3A
Current limiting protection
Thermal protection
Current-shoot-through protection
High accuracy output voltage at full load
Minimum external components
Adjustable V OUT by external resistors
Shutdown for standby or suspend mode operation with high-impedance output
Block Diagram
VREFEN
VCNTL
VIN
Current limiting
sensor
CNTL
VOUT
Thermal
GND
Data and specifications subject to change without notice
1
200903267
AP1250GM / AP1250GH
Applications
Mother Board DDR-SDRAM Termination
Mother Board DDR-II Termination
Game / Play Station
Set Top Box
PCI / AGP Graphics
IPC
SCSI-III Bus Termination
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Pin Configuration
●
Part No. AP1250GM (SO-8 package)
VIN
●
Part No. AP1250GH (TO-252-5L package)
VCNTL
GND
VCNTL
VREFEN
VCNTL
VOUT
VCNTL
1. VIN
2. GND
3. VCNTL(TAB)
4. VREFEN
5. VOUT
1
2
3
4
5
Pin Description
Pin Name
Function
VIN
Power Input
GND
Ground
VCNTL
Gate Drive Voltage
VREFEN
Reference Voltage Input and Chip Enable
VOUT
Output Voltage
Ordering Information
AP1250GX
Package
M : SO-8
H : TO-252-5L
Data and specifications subject to change without notice
2
AP1250GM / AP1250GH
Absolute Maximum Ratings
Power Input Voltage
6V
Power Dissipation
internal limited
HBM ESD Rating
3KV
Storage Temperature Range
-55 ℃ to 150 ℃
Lead Temperature(Soldering 5 sec)
260 ℃
3
SO-8 Thermal Resistance (Rthjc)
20℃/W
SO-8 Thermal Resistance(Rthja)
80℃/W
TO-252-5L Thermal Resistance(Rthjc)
6℃/W
TO-252-5L Thermal Resistance(Rthja)
40℃/W
Electrical Characteristics @ T A = 25℃ ( unless otherwise specified )
VIN = +2.5V, V CNTL = +3.3V, V REFEN = +1.25V, COUT = 10uF(Ceramic)
Symbol
Parameter
VOS
Output Offset Voltage
| △ VLOAD |
Load Regulation
VIN
1
2
Input Voltage Range(DDR I/II)
VCNTL
Gate Drive Voltage Range
ISHDN
Current in Shutdown
2
Max. Units
Test Conditions
Min.
Typ.
IOUT = 0A
-20
-5
20
mV
IL : 0 --> 1.5A
--
0.5
2
%
IL : 1.5 --> 3A
--
2
3
%
VCNTL >= V IN
1.6
2.5/1.8
--
V
VCNTL >= V IN
--
3.3
6
V
VREFEN < 0.2V,RL=180Ω
--
10
90
uA
AP1250M
--
2
--
A
AP1250H
--
3
--
A
IOUT = 0A
--
1
3
mA
3.3V≦VCNTL≦ 5V
--
140
--
℃
Short Circuit Protection
ILIMIT
Iq
Current Limit
Quiescent Current
Over Temperature Protection
T OS
Thermal Shutdown Temperature
Shutdown Function
Shutdown Threshold Trigger
Output = High
0.8
--
--
V
Shutdown Threshold Trigger
Output = Low
--
--
0.2
V
Notes:
1.VOS is the voltage measurement V OUT subtracted from VREFEN.
2.Keep VCNTL >= V IN at power on/off sequences.
3.Surface mounted on 1 in2 copper pad of FR4 board
Data and specifications subject to change without notice
3
AP1250GM / AP1250GH
Application Circuit
VCNTL=3.3V
VIN=2.5V/1.8V/1.5V
CIN
VIN
R1
RTT
AP1250GM/H
REFEN
VOUT
2N7002
EN
CCNTL
VCNTL
CSS
R2
GND
COUT
R1=R2=100KΩ, RTT=50Ω/33Ω/25Ω
COUT, min=10uF(Ceramic) +1000uF Under the worst case test condition
CSS=1uF, CIN=470uF(Low ESR), CCNTL=47uF
Data and specifications subject to change without notice
4
AP1250GM / AP1250GH
Typical Performance Characteristics
1.275
1.25
1.25
VOUT (V)
VOUT (V)
1.275
1.225
1.225
VIN = 1.25V
TA = 25℃
VCNTL = 3.3V
TA = 25℃
1.2
1.5
1.7
1.2
1.9
VIN(V)
2.1
2.3
2.5
2.5
Fig 1. Line Regulation( VIN vs. VOUT )
4
4.5
VCNTL (V)
5
5.5
6
Sink
VIN = 2.5V
VCNTL = 3.3V
VREFEN = 1.25V
IL(2.0A/DIV)
IL(2.0A/DIV)
3.5
Fig 2. Line Regulation( VCNTL vs. VOUT )
VIN = 2.5V
VCNTL = 3.3V
VREFEN = 1.25V
Source
3
Time(200us/DIV)
Time(200us/DIV)
Fig 3. Output Short-Circuit Protection
Data and specifications subject to change without notice
Fig 4. Output Short-Circuit Protection
5
AP1250GM / AP1250GH
Typical Performance Characteristics
VIN = 2.5V
VCNTL = 3.3V
IL=-1.5A
f=1KHz
Sink
IL(0.5A/DIV)
IL(0.5A/DIV)
VOUT(100mV/DIV)
Source
VOUT(100mV/DIV)
VIN = 2.5V
VCNTL = 3.3V
IL=1.5A
f=1KHz
Time(200us/DIV)
Time(200us/DIV)
Fig 5. Transient Response
Fig 6. Transient Response
VIN = 2.5V
VCNTL = 3.3V
f=1KHz
100
90
80
Tc = 80℃
100℃
120℃
Duty (%)
70
60
50
40
30
20
10
0
2
4
IL (A)6
8
10
Fig 7. Safe Operating Area
Data and specifications subject to change without notice
6