APW7037A/B 8-PIN Synchronous Buck PWM Controller Features General Description • • • The APW7037 series are designed to provide a low cost synchronous Buck regulator for on-board DC to DC con- • • • Operating with Single 5V or 12V Input Drives N-Channel MOSFETs Simple Single-Loop Control Design verter applications. The APW7037 series together with dual N-channel MOSFETs such as APM7313, provide a - Voltage-Mode PWM Control - Full 0% to 100% Duty Ratio low cost solution for such applications. Each device features an internal 200/400kHz oscillator, Power-On-Reset - Fast Transient Response (POR) for both VCC and VC supplies, an external programmable soft-start function as well as output under- ±2% Output Voltage Accuracy Over Temperature voltage detection that latches off the device when an output short is detected. Under-Voltage Protection for Output 200/400kHz Constant Frequency Operation - 200kHz for APW7037B - 400kHz for APW7037A • • Small size, 8-PIN Package (SOIC or TSSOP) Pin Configuration Lead Free and Green Devices Available (RoHS Compliant) Applications • • • • Graphics Cards FB 1 8 SS VCC 2 7 COMP LDRV 3 6 VC GND 4 5 HDRV DDR Memory Power Supply DDR Memory Termination Voltage Low-Voltage Distributed Power Supplies ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright ANPEC Electronics Corp. Rev. A.7 - Jun. , 2008 1 www.anpec.com.tw APW7037A/B Ordering and Marking Information Package Code K : SOP-8 O : TSSOP-8 Operating Junction Temperature Range C : 0 to 70oC Handling Code TR : Tape & Reel Assembly Material L : Lead Free Device G : Halogen and Lead Free Device APW7037A/B Assembly Material Handling Code Temperature Range Package Code APW7037A/B XXXXX APW7037A/B K : APW7037A/B O : XXXXX - Date Code APW7037A/B XXXXX XXXXX - Date Code Note : ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD020C for MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by weight). Absolute Maximum Ratings Symbol Parameter Rating Unit VCC VCC to GND -0.2~30 V VC VC to GND -0.2~30 V TJ Operating Junction Temperature 0~125 °C -65~150 °C 260 °C TSTG Storage Temperature TSDR Maximum Lead Soldering Temperature, 10 Seconds Thermal Characteristics Symbol θJA Parameter Typical Value Unit 160 124 °C/W Thermal Resistance in Free Air Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 SOP-8 TSSOP-8 2 www.anpec.com.tw APW7037A/B Electrical Characteristics Unless otherwise specified, these specifications apply over VCC=5V, VC=12V and TA =0 to 70°C. Typical values refer to TA =25°C. APW7037/A/B Parameter Symbol Unit Test Conditions Min. Typ. Max. FOSC=200kHz, CL=1500pF 2 3 5 mA VC Dynamic Supply Current FOSC=200kHz, CL=1500pF 2 5.5 8 mA VCC Static Supply Current SS=GND 0.5 1.5 3 mA VC Static Supply Current SS=GND 0.2 0.4 1 mA SUPPLY CURRENT ICC IC ICCQ ICQ VCC Dynamic Supply Current POWER-ON-RESET Rising VCC Threshold 4.0 4.2 4.4 V VCC POR Hysteresis - 0.25 - V Rising VC Threshold 3.1 3.3 3.5 V VC POR Hysteresis - 0.2 - V APW7037A 360 400 440 APW7037B 180 200 220 - 1.10 - V - 1 - nA OSCILLATOR FOSC Free Running Frequency ∆VOSC Ramp Amplitude kHz ERROR AMPLIFIER IFB1 FB Pin Input Bias Current SS=3V, VFB=1V IFB2 FB Pin Input Bias Current SS=0V, VFB=1V GM Transconductance - -64 - µA 450 600 750 µmho APW7037A 0. 784 0. 800 0. 816 APW7037B 0.784 0.800 0.816 - 0.2 REFERENCE VOLTAGE VFB LREG FB Pin Regulation Voltage VFB Line Regulation VCC = 5~12V 0.35 V % GATE DRIVERS HDRV Rising Time CL = 1500pF - 20 50 nS HDRV Falling Time CL = 1500pF - 15 50 nS LDRV Rising Time CL = 1500pF - 25 50 nS LDRV Falling Time CL = 1500pF - 25 50 50 150 250 nS nS APW7037A 0.3 0.4 0.5 V APW7037B 0.3 0.4 0.5 - 0.5 - V 10 20 30 µA Dead Band Time PROTECTION VFBUV FB Under-Voltage Threshold VFB Falling VSD Shutdown Threshold Voltage Pull the voltage of SS pin ISS Soft-Start Current SS=0 Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 3 www.anpec.com.tw APW7037A/B Function Pin Description FB (Pin 1) SS (Pin 8) Connect this pin to the output (VOUT) of the PWM converter via an external resistor divider to provide a voltage Connect a capacitor from this pin to ground.This capacitor, along with an internal 20µA current source, sets the soft- feedback path for the converter. The output voltage set by the resistor divider is determined using the following for- start interval of the PWM converter and prevents the outputs from overshoot as well as limits the input current. mula : Pull this pin below 0.5V can shutdown the converter. VOUT = VREF x ( 1+ R OUT ) R GND where ROUT is the resistor connected from VOUT to FB , and RGND is the resistor connected from FB to ground. The voltage at this pin is also monitored for Under-Voltage protection. VCC (Pin 2) Connect this pin to input voltage from 5V to 20V. This pin provides the bias for the control circuitry and the low-side power MOSFET driver (LDRV). The voltage at this pin is monitored for Power-On-Reset (POR) purpose. LDRV (Pin 3) Connect this pin to the gate of the low-side power MOSFET. This pin provides the gate drive for the MOSFET. GND (Pin 4) Signal and power ground for the IC. All voltage levels are measured with respect to this pin. HDRV (Pin 5) Connect this pin to the gate of the high-side power MOSFET. This pin provides the gate drive for the MOSFET. VC (Pin 6) This pin provides bias voltage to the high-side MOSFET driver. A bootstrap circuit may be used to pump a boot voltage for enforcing the driving capability of the gate driver and improving the performance of the MOSFET. COMP (Pin 7) This pin is the output of the error amplifier. Add an external resistor-capacitor network to provide a loop compensation for the PWM converter. Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 4 www.anpec.com.tw APW7037A/B Block Diagram SS VCC 20uA 4.5V Regulator 3.3V Max . 64uA POR Pow er On Reset VC HDRV Under-Voltage V FBUV 25k PWM FB Gate Control V CC Error Amp. 25k LDRV V REF OSC FOSC GND COMP Typical Application Circuit 1. Dual supply voltage(5V and 12V) application R4 3 +12V 2 6 C1 1uF VCC Q2 APM2300 A Shutdown 8 C2 1uF C5 1uF VC SS HDRV Q1A APM7313 5 U1 APW7037A/B C7 0.1uF COMP GND Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 C6,C9 2 x 150uF R1 249 1 R2 1.24k 4 C8 2200pF FB L4 3.3uH Q1B APM7313 LDRV R3 24k C3 47uF VIN +5V VOUT 1.5V/5 A 3 7 C4 100uF L3 1uH 5 www.anpec.com.tw APW7037A/B Typical Application Circuit (Cont.) 2. Single supply voltage(5V) application R4 3 D1 1N4148 D3 1N4148 C1 1uF C5 100uF C6 1uF VC L3 1uH C4 47uF VIN +5V C3 0.1uF Q2 APM2300 A 8 SS HDRV LDRV COMP R3 24k GND VOUT 1.5V/5 A R1 249 1 R2 1.24k 4 C9 2200pF FB C7,C10 2 x150uF Q1B APM7312 3 7 L4 3.3uH Q1A APM7312 5 U1 APW7037A/B C8 0.1uF Shutdown C2 1uF 6 2 VCC D2 1N4148 3. LCD Monitor Application Circuit R8 0 R4 3 Extra Circuit for VIN>15V Application C11 1uF D2 1N4148 6 2 VCC R5 18k R7 1k C12 0.1uF U2 APL431 R6 10k D1 1N4148 C1 1uF Q2 2N3904 C2 1uF C6 1uF VC L3 C5 1uH 470uF C4 47uF VIN 9V~22V C3 0.1uF 8 SS HDRV C8 0.1uF Q1A APM7313 5 U1 APW7037A/B R9 12 Q1B APM7313 3 7 LDRV COMP R10 12 R3 24k GND Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 C7,C10 2 x470uF VOUT 5V / 0.2~5 A R1 3k 1 R2 1k 4 C9 2200pF FB L4 50uH 6 www.anpec.com.tw APW7037A/B Package Information SOP-8 D E E1 SEE VIEW A h X 45 ° c A 0.25 b GAUGE PLANE SEATING PLANE A1 A2 e L VIEW A S Y M B O L SOP-8 MILLIMETERS MIN. INCHES MAX. A MIN. MAX. 1.75 0.069 0.004 0.25 0.010 A1 0.10 A2 1.25 b 0.31 0.51 0.012 0.020 c 0.17 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 5.80 6.20 0.228 0.244 E1 3.80 4.00 0.150 0.157 e 0.049 1.27 BSC 0.050 BSC h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 0 0° 8° 0° 8° Note: 1. Follow JEDEC MS-012 AA. 2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 6 mil per side. 3. Dimension “E” does not include inter-lead flash or protrusions. Inter-lead flash and protrusions shall not exceed 10 mil per side. Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 7 www.anpec.com.tw APW7037A/B Package Information TSSOP-8 D E E1 SEE VIEW A C A 0.25 b A2 e GAUGE PLANE A1 SEATING PLANE S Y M B O L VIEW A L TSSOP-8 INCHES MILLIMETERS MIN. MIN. MAX. A MAX. 0.047 1.20 A1 0.05 0.15 0.002 0.006 A2 0.80 1.05 0.031 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.008 D 2.90 3.10 0.114 0.122 E 6.20 6.60 0.244 0.260 E1 4.30 4.50 0.169 0.177 0.65 BSC e L 0.45 0 0 ° 0.026 BSC 0.75 8° 0.018 0.030 0° 8° Note : 1. Follow JEDEC MO-153 AA 2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 6 mil per side. 3. Dimension "E1" does not include inter-lead flash or protrusions. Inter-lead flash and protrusions shall not exceed 10 mil per side. Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 8 www.anpec.com.tw APW7037A/B Carrier Tape & Reel Dimensions P0 P2 P1 A B0 W F E1 OD0 K0 A0 A OD1 B B T SECTION A-A SECTION B-B H A d T1 A Application H 330.0±2.00 50 MIN. T1 C d D 12.4+2.00 13.0+0.50 1.5 MIN. -0.00 -0.20 P0 P1 P2 D0 D1 4.0±0.10 8.0±0.10 2.0±0.05 1.5+0.10 -0.00 1.5 MIN. A H T1 C d SOP-8 Application 330.0±2.00 50 MIN. P0 TSSOP-8 P1 P2 4.00±0.10 8.00±0.10 2.00±0.05 D1 1.5+0.10 -0.00 1.5 MIN. A0 B0 F 5.5±0.05 K0 0.6+0.00 -0.40 6.40±0.20 5.20±0.20 2.10±0.20 D D0 E1 20.2 MIN. 12.0±0.30 1.75±0.10 T 12.4+2.00 13.0+0.50 -0.00 -0.20 1.5 MIN. W W E1 20.2 MIN. 12.0±0.30 1.75±0.10 T A0 B0 F 5.5±0.10 K0 0.6+0.00 -0.40 6.90±0.20 3.40±0.20 1.60±0.20 (mm) Devices Per Unit Package Type Unit Quantity SOP-8 Tape & Reel 2500 TSSOP-8 Tape & Reel 2500 Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 9 www.anpec.com.tw APW7037A/B Reflow Condition (IR/Convection or VPR Reflow) tp TP Critical Zone TL to TP Temperature Ramp-up TL tL Tsmax Tsmin Ramp-down ts Preheat 25 t 25°C to Peak Time Reliability Test Program Test item SOLDERABILITY HOLT PCT TST ESD Latch-Up Method MIL-STD-883D-2003 MIL-STD-883D-1005.7 JESD-22-B, A102 MIL-STD-883D-1011.9 MIL-STD-883D-3015.7 JESD 78 Description 245°C, 5 sec 1000 Hrs Bias @125°C 168 Hrs, 100%RH, 121°C -65°C~150°C, 200 Cycles VHBM > 2KV, VMM > 200V 10ms, 1tr > 100mA Classification Reflow Profiles Profile Feature Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Time maintained above: - Temperature (TL) - Time (tL) Peak/Classification Temperature (Tp) Time within 5°C of actual Peak Temperature (tp) Ramp-down Rate Sn-Pb Eutectic Assembly Pb-Free Assembly 3°C/second max. 3°C/second max. 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds 183°C 60-150 seconds 217°C 60-150 seconds See table 1 See table 2 10-30 seconds 20-40 seconds 6°C/second max. 6°C/second max. 6 minutes max. 8 minutes max. Time 25°C to Peak Temperature Note: All temperatures refer to topside of the package. Measured on the body surface. Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 10 www.anpec.com.tw APW7037A/B Classification Reflow Profiles (Cont.) Table 1. SnPb Eutectic Process – Package Peak Reflow Temperatures 3 Package Thickness Volume mm <350 <2.5 mm 240 +0/-5°C ≥2.5 mm 225 +0/-5°C 3 Volume mm ≥350 225 +0/-5°C 225 +0/-5°C Table 2. Pb-free Process – Package Classification Reflow Temperatures 3 3 3 Package Thickness Volume mm Volume mm Volume mm <350 350-2000 >2000 <1.6 mm 260 +0°C* 260 +0°C* 260 +0°C* 1.6 mm – 2.5 mm 260 +0°C* 250 +0°C* 245 +0°C* ≥2.5 mm 250 +0°C* 245 +0°C* 245 +0°C* *Tolerance: The device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means Peak reflow temperature +0°C. For example 260°C+0°C) at the rated MSL level. Customer Service Anpec Electronics Corp. Head Office : No.6, Dusing 1st Road, SBIP, Hsin-Chu, Taiwan Tel : 886-3-5642000 Fax : 886-3-5642050 Taipei Branch : 2F, No. 11, Lane 218, Sec 2 Jhongsing Rd., Sindian City, Taipei County 23146, Taiwan Tel : 886-2-2910-3838 Fax : 886-2-2917-3838 Copyright ANPEC Electronics Corp. Rev. A.7 - Jun., 2008 11 www.anpec.com.tw