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 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 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=180 -- 10 90 uA AP1250M -- 2 -- A AP1250H -- 3 -- A IOUT = 0A -- 1 3 mA 3.3VVCNTL 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=100K, RTT=50/33/25 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