Advanced Power
Electronics Corp. 1.5A BUS TERMINATION REGULATOR
FEATURES DESCRIPTIOON
Ideal for DDR-I and DDR-II Applications
Capable of Sourcing and Sinking Current 1.5A
Current Limiting Protection
Thermal Protection
Current-shoot-through Protection
High Accuracy Output Voltage at Full Load
Minimum External Components
Adjustable VOUT by External Resistors
Shutdown for Standby or Suspend Mode Operation
with High-impedance Output
Halogen Free Product
APPLICATION
Mother Board DDR-SDRAM Termination
Mother Board DDR-II Termination
Game / Play Station
Set Top Box
PCI / AGP Graphics
IPC
SCSI-III Bus Termination
Data and specifications subject to change without notice
20130710V8.2
AP1250GM
TYPICAL APPLICATION
1
AP1250GM 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 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 packages are available for
all commercial and industrial surface mount
applications.
VOUT = VREF = VIN x [ R2 / (R1+R2)]
R1 = R2 = 100KΩ, RTT = 50Ω / 33Ω / 25Ω
COUT,min = 10uF (Ceramic) + 1000uF under the worst case testing condition
CSS = 1µF, CIN = 470µF(Low ESR), CCNTL = 47µF
VIN VCNTL
REFEN VOUT
GND
RTT
EN
VIN=2.5V/1.8V/1.5V
VCNTL=3.3V
R1
R2CSS
CIN
COUT
CCNTL
2N7002 AP1250GM
Advanced Power
Electronics Corp. AP1250GM
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) -----------------------------------------
-
6V
HBM ESD Rating ------------------------------------------
-
3KV
Power Dissipation (PD) -----------------------------------
-
1.25W
Storage Temperature Range (TST) --------------------
-
-65 to +150°C
Junction Temperature Range (TJ) --------------------- -40 to +125°C
Ambient Temperature Range (TA) --------------------- -40 to +85°C
Lead Temperature (Soldering, 10sec.) --------------- 260°C
20°C/W
80°C/W
Note1. Surface mounted on 1 in2 copper pad of FR4 board
ORDERING / PACKAGE INFORMATION
(VIN=2.5V, VCNTL=3.3V, VREFEN=1.25V, COUT=10uF(Ceramic), T
A
=25oC, unless otherwise specified)
Parameter SYM TEST CONDITION MIN TYP MAX UNITS
Input Voltage Range(DDR I/II)Note3 VIN VCNTL > VIN 1.6 2.5/1.8 - V
Gate Drive Voltage RangeNote3 VCNTL VCNTL > VIN -3.3 6 V
Current in Shutdown ISHDN VREFEN < 0.2V, RLOAD = 180Ω-10 90 uA
Output Offset VoltageNote2 VOS IOUT = 0A -20 -5 20 mV
IOUT = 10mA ~ 1.5A - 0.5 2
IOUT = -10mA ~ -1.5A - 0.5 2
Current Limit ILIM -2-A
Quiescent Current IQIOUT=0A - 1 3 mA
Thermal Shutdown Temperature TSD 3.3V < VCNTL < 5V - 140 - oC
VIH Enable 0.8 - -
VIL Shutdown - - 0.2
Note2. VOS offset is the voltage measurement defined as VOUT subtracted from VREFEN.
Note3. Keep VCNTL > VIN at power on/off sequences.
Note4. Regulation is measured at constant junction temperature by using a 5ms current pulse. Devices are tested for load regulation
in the load range from 0A to 1.5A.
2
Thermal Resistance from Junction to Case (Rthjc)Note1
Output (DDR-I / DDR-II)
Load RegulationNote4 ΔVLoad
Protection
REFEN Shutdown
Shutdown Threshold V
%
ELECTRICAL SPECIFICATIONS
Input
Thermal Resistance from Junction to Ambient (Rthja)
AP1250GX
M : SO-8
Package Type
(Top View)
1
2
3
4
8
7
6
5
VIN
VREF
SO-8
VOUT
GND
VCNTL
VCNTL
VCNTL
VCNTL
Advanced Power
Electronics Corp. AP1250GM
PIN DESCRIPTIONS
PIN SYMBOL PIN DESCRIPTION
VIN Power Input Voltage.
GND Ground Pin
VOUT Output Voltage
VCNTL Gate Drive Voltage
VREFEN Reference Voltage Input and Chip Enable
BLOCK DIAGRAM
3
Advanced Power
Electronics Corp. AP1250GM
TYPICAL PERFORMANCE CHARACTERISTICS
4
VIN=2.5V,VCNTL=3.3V,VREFEN=1.25V
Transient Response (Source) Transient Response (Sink)
VIN=2.5V,VCNTL=3.3V,VREFN=1.25V
VIN=2.5V,VCNTL=3.3V,IOUT=0.1~1.5A
Line Regulation( VIN vs. VOUT ) Line Regulation( VCNTL vs. VOUT )
VIN=2.5V,VCNTL=3.3V,IOUT=0.1~1.5A
Output Short-Circuit Protection (Source) Output Short-Circuit Protection (Sink)
Advanced Power
Electronics Corp. AP1250GM
TYPICAL PERFORMANCE CHARACTERISTICS
Safe Operating Area
5
Advanced Power
Electronics Corp. AP1250GM
MARKING INFORMATION
SO-8
6
1250GM
YWWSSS
Part Numbe
r
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Package Code
