Power AP1250GM 1.5a / 3a bus termination regulator Datasheet

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
VCNTL
VREFEN
VIN
Current limiting
sensor
CNTL
VOUT
Thermal
GND
Data and specifications subject to change without notice
200807035,1/5
AP1250GM / AP1250GH
Applications
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Mother Board DDR-SDRAM Termination
Mother Board DDR-II Termination
Game / Play Station
Set Top Box
PCI / AGP Graphics
IPC
SCSI-III Bus Termination
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
Data and specifications subject to change without notice
2/5
AP1250GM / AP1250GH
Absolute Maximum Ratings
Power 6V
internal limited
HBM 3KV
-55 ℃ to 150 ℃
260 ℃
! WKMF
20℃/W
! WKMD
80℃/W
""! WKMF
6℃/W
""! WKMD
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 : 0 --> - 1.5A
--
0.5
2
%
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
3/5
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
4/5
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
5/5
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