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| Advanced Power Electronics Corp, General Description AP1250GM / AP1250GH 1.5A / 3A Bus Termination Regulator Pb Free Plating Product 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 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 VIN VREFEN Current limiting sensor CNTL Thermal GND VOUT Data and specifications subject to change without notice 200807035,1/5 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 Pin Configuration Part No. AP1250GM (SO-8 package) Part No. AP1250GH (TO-252-5L package) VIN GND VREFEN VOUT VCNTL VCNTL VCNTL VCNTL 1 2 3 4 5 1. VIN 2. GND 3. VCNTL(TAB) 4. VREFEN 5. VOUT Pin Description Pin Name VIN GND VCNTL VREFEN VOUT Function Power Input Ground Gate Drive Voltage Reference Voltage Input and Chip Enable Output Voltage Data and specifications subject to change without notice 2/5 AP1250GM / AP1250GH Absolute Maximum Ratings Power ,QSXW 9ROWDJH 3RZHU 'LVVLSDWLRQ HBM (6' 5DWLQJ 6WRUDJH 7HPSHUDWXUH 5DQJH /HDG 7HPSHUDWXUH 6ROGHULQJ VHF 62 7KHUPDO 5HVLVWDQFH 5WKMF 62 7KHUPDO 5HVLVWDQFH 5WKMD 72/ 7KHUPDO 5HVLVWDQFH 5WKMF 72/ 7KHUPDO 5HVLVWDQFH 5WKMD 6V internal limited 3KV -55 to 150 260 20/W 80/W 6/W 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 VOS | VLOAD | VIN VCNTL ISHDN ILIMIT Iq T OS Parameter Output Offset Voltage Load Regulation Input Voltage Range(DDR I/II) Gate Drive Voltage Range Current in Shutdown Current Limit Quiescent Current Thermal Shutdown Temperature Shutdown Threshold Trigger Shutdown Threshold Trigger 2 2 1 Test Conditions IOUT = 0A IL : 0 --> 1.5A IL : 0 --> - 1.5A VCNTL >= V IN VCNTL >= V IN VREFEN < 0.2V,RL=180 AP1250M AP1250H IOUT = 0A 3.3VVCNTL 5V Output = High Output = Low Min. -20 --1.6 ------0.8 -- Typ. -5 0.5 0.5 2.5/1.8 Max. Units 20 2 2 -6 90 --3 --0.2 mV % % V V uA A A mA V V 3.3 10 2 3 1 140 --- Short Circuit Protection Over Temperature Protection Shutdown Function 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 1.275 1.25 VOUT (V) 1.25 VOUT (V) 1.225 1.225 1.2 1.5 VCNTL = 3.3V TA = 25 1.7 1.9 VIN(V) 2.1 2.3 2.5 VIN = 1.25V TA = 25 1.2 2.5 3 3.5 4 4.5 VCNTL (V) 5 5.5 6 Fig 1. Line Regulation( VIN vs. VOUT ) Fig 2. Line Regulation( VCNTL vs. VOUT ) Source VIN = 2.5V VCNTL = 3.3V VREFEN = 1.25V Sink VIN = 2.5V VCNTL = 3.3V VREFEN = 1.25V IL(2.0A/DIV) IL(2.0A/DIV) Time(200us/DIV) Time(200us/DIV) Fig 3. Output Short-Circuit Protection Fig 4. Output Short-Circuit Protection Data and specifications subject to change without notice 4/5 AP1250GM / AP1250GH Typical Performance Characteristics IL(0.5A/DIV) VOUT(100mV/DIV) IL(0.5A/DIV) VOUT(100mV/DIV) Source VIN = 2.5V VCNTL = 3.3V IL=1.5A f=1KHz Sink 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 100 90 80 VIN = 2.5V VCNTL = 3.3V f=1KHz 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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