APW7037/A/B 8-PIN Synchronous Buck PWM Controller Features General Description • • • Operating with Single 5V or 12V Input The APW7037 series are designed to provide a low Drives N-Channel MOSFETs cost synchronous Buck regulator for on-board DC to Simple Single-Loop Control Design DC converter applications. The APW7037 series to- − Voltage-Mode PWM Control − Full 0% to 100% Duty Ratio − Fast Transient Response gether with dual N-channel MOSFETs such as APM7313, provide a low cost solution for such applications. Each device features an internal 200/ • ±2% Output Voltage Accuracy Over Temperature • Under-Voltage Protection for Output • 200/400kHz Constant Frequency Operation 400kHz oscillator, Power-On-Reset (POR) for both VCC and VC supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected. -200kHz for APW7037 & APW7037B -400kHz for APW7037A • • Small size, 8-PIN Package (SOIC or TSSOP) Pin Description Lead Free Available (RoHS Compliant) Applications • • • • Graphics Cards DDR Memory Power Supply FB 1 8 SS VCC 2 7 COMP LDRV 3 6 VC GND 4 5 HDRV 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.6 - Apr , 2005 1 www.anpec.com.tw APW7037/A/B Ordering and Marking Information Package Code K : SO-8 R : TSSOP-8 Operating Junction Temp. Range C : 0 to 70°C Handling Code TU : Tube TR : Tape & Reel Lead Free Code L : Lead Free Device Blank : Original Device APW 7037/A/B Lead Free Code Handling Code Temp. Range Package Code APW 7037/A/B K : APW 7037/A/B XXXXX XXXXX - Date Code APW 7037/A/B XXXXX APW 7037/A/B R : XXXXX - Date Code Notes: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte in plate termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering operations. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C for MSL classification at lead-free peak reflow temperature. Block Diagram SS V CC 20uA 4.5V Regulator 3.3V Max . 64uA POR Pow er On Res et VC HDRV Under-V oltage V F BU V 25k PW M FB 25k Gate Control V CC Error A mp. V R EF LDRV OSC FOSC CO M P G ND Absolute Maximum Ratings Description Rating -0.2~30 -0.2~30 0~125 -65~150 300 ±2 VCC to GND VC to GND Operating Junction Temperature Storage Temperature Soldering Temperature (10 Seconds) Minimum ESD Rating Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 2 Unit V V °C °C °C kV www.anpec.com.tw APW7037/A/B Thermal Characteristics Symbol θJA Parameter Thermal Resistance in Free Air 8-pin SOIC 8-pin TSSOP Value Unit 160 124 °C/W 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°. APW7037/A/B Symbol Parameter Test Conditions Unit Min. Typ. Max. FOSC=200KHz, CL=1500pF 2 3 5 mA VC Dynamic Supply Current FOSC=200KHz, CL=1500pF 2 5.5 8 mA ICCQ VCC Static Supply Current SS=GND 0.5 1.5 3 mA ICQ VC Static Supply Current SS=GND 0.2 0.4 1 mA 4.0 4.2 4.4 V SUPPLY CURRENT ICC IC VCC Dynamic Supply Current POWER-ON RESET Rising VCC Threshold VCC POR Hysteresis 0.25 Rising VC Threshold 3.1 VC POR Hysteresis 3.3 V 3.5 0.2 V V OSCILLATOR FOSC ∆VOSC Free Running Frequency APW7037 180 200 220 APW7037A 360 400 440 APW7037B 180 200 220 Ramp Amplitude KHz 1.10 V ERROR AMPLIFIER IFB1 FB Pin Input Bias Current SS=3V, VFB=1V 1 nA IFB2 FB Pin Input Bias Current SS=0V, VFB=1V -64 µA GM Transconductance 450 600 750 µmho REFERENCE VOLTAGE APW7037 1.225 1.250 1.275 VFB FB Pin Regulation Voltage APW7037A 0. 784 0. 800 0. 816 V APW7037B 0.784 0.800 0.816 LREG VFB Line Regulation Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 VCC = 5~12V 3 0.2 0.35 % www.anpec.com.tw APW7037/A/B Electrical Characteristics (Cont.) 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 Symbol Parameter Test Conditions Min. Typ. Max. Unit 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 APW7037 0.4 0.6 0.8 APW7037A 0.3 0. 4 0. 5 APW7037B 0.3 0.4 0.5 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 0.5 10 20 V V 30 µA Functional Pin Description FB (Pin 1) Connect this pin to the output (VOUT) of the PWM converter via an external resistor divider to provide a voltage feedback path for the converter. The output voltage set by the resistor divider is determined using the following formula : R OUT VOUT = VREF x ( 1+ ) 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. R GND 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. 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 UnderVoltage 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. 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. SS (Pin 8) Connect a capacitor from this pin to ground.This capacitor, along with an internal 20uA current source, sets the soft-start interval of the PWM converter and prevents the outputs from overshoot as well as limits the input current. Pull this pin below 0.5V can shutdown the converter. 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 Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 4 www.anpec.com.tw APW7037/A/B Typical Applications 1. Dual supply voltage(5V and 12V) application R4 3 V CC Q2 A P M 2300A 8 C2 1uF 6 2 C1 1uF + 12V C5 1uF VC SS HDRV U1 A P W 7037 C7 0.1uF C3 47uF V OU T 1.5V /5 A Shutdown Q 1B A P M 7313 3 LDRV 7 V IN + 5V L4 3.3uH Q 1A A P M 7313 5 C4 100uF L3 1uH C6,C9 2 x 150uF CO M P R3 24k FB G ND R2 1.24k 4 C8 2200pF R1 249 1 2. Single supply voltage(5V) application R4 3 D1 1N4148 D3 1N4148 C1 1uF 6 2 V CC C2 1uF C6 1uF VC C5 100uF L3 1uH V IN + 5V C4 47uF C3 0.1uF Q2 A P M 2300A 8 SS H DR V Shutdown D2 1N4148 Q1A A P M 7312 5 U1 A P W 7037 C8 0.1uF V OU T 1.5V /5 A Q1B A P M 7312 3 7 L4 3.3uH LD RV C7,C10 2 x 150uF CO M P R3 24k G ND Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 1 R2 1.24k 4 C9 2200pF FB R1 249 5 www.anpec.com.tw APW7037/A/B Typical Applications (Cont.) 3. LCD Monitor Application Circuit R8 0 R4 3 E x tra Circ uit for V IN> 15V A pplic ation C11 1uF D2 1N4148 6 2 V CC R5 18k R7 1k C12 0.1uF U2 A P L431 R6 10k D1 1N4148 C1 1uF Q2 2N3904 C2 1uF C6 1uF VC C5 470uF L3 1uH C4 47uF V IN 9V ~ 22V C3 0.1uF 8 SS HDRV C8 0.1uF Q 1A A P M 7313 5 U1 A P W 7037 R9 12 LDRV CO M P R10 12 R3 24k G ND Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 C7,C10 2 x 470uF R1 3k 1 R2 1k 4 C9 2200pF FB V OU T 5V / 0.2~ 5 A Q 1B A P M 7313 3 7 L4 50uH 6 www.anpec.com.tw APW7037/A/B Package Information E e1 0.015X45 SOP-8 pin ( Reference JEDEC Registration MS-012) H e2 D A1 1 L 0.004max. Dim A Mi ll im et er s Inche s A Min. 1. 35 Max . 1. 75 Min. 0. 053 Max . 0. 069 A1 D E 0. 10 4. 80 3. 80 0. 25 5. 00 4. 00 0. 004 0. 189 0. 150 0. 010 0. 197 0. 157 H L e1 e2 5. 80 0. 40 0. 33 6. 20 1. 27 0. 51 0. 228 0. 016 0. 013 0. 244 0. 050 0. 020 φ 1 Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 1. 27B S C 0. 50B S C 8° 8° 7 www.anpec.com.tw APW7037/A/B Package Information TSSOP-8 e 8 7 2x E/2 E1 ( 2) E GAUGE PLANE S 1 2 e/2 0.25 D L A2 A b Dim A A1 A2 b D e E E1 L L1 R R1 S φ1 φ2 φ3 1 (L1) ( 3) A1 Millimeters Min. Inches Max. 1.2 0.15 1.05 0.30 3.1 0.00 0.80 0.19 2.9 Min. 0.000 0.031 0.007 0.114 0.65 BSC 6.40 BSC 4.30 0.45 0.026 BSC 0.252 BSC 4.50 0.75 0.169 0.018 8° 0.004 0.004 0.008 0° 1.0 REF 0.09 0.09 0.2 0° Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 Max. 0.047 0.006 0.041 0.012 0.122 0.177 0.030 0.039REF 12° REF 12° REF 8° 12° REF 12° REF 8 www.anpec.com.tw APW7037/A/B Physical Specifications Terminal Material Lead Solderability Solder-Plated Copper (Solder Material : 90/10 or 63/37 SnPb), 100%Sn Meets EIA Specification RSI86-91, ANSI/J-STD-002 Category 3. Reflow Condition (IR/Convection or VPR Reflow) tp TP C ritical Z one T L to T P T e m p e ra tu re R am p-up TL tL T sm ax T sm in R am p-down ts Preheat 25 t 25 °C to Peak T im e Classificatin Reflow Profiles Profile Feature Sn-Pb Eutectic Assembly Large Body Small Body Average ramp-up rate 3°C/second max. (TL to TP) Preheat - Temperature Min (Tsmin) 100°C - Temperature Mix (Tsmax) 150°C - Time (min to max)(ts) 60-120 seconds Tsmax to TL - Ramp-up Rate Tsmax to TL - Temperature(TL) 183°C - Time (tL) 60-150 seconds Peak Temperature(Tp) 225 +0/-5°C 240 +0/-5°C Time within 5°C of actual Peak 10-30 seconds 10-30 seconds Temperature(tp) Ramp-down Rate 6°C/second max. 6 minutes max. Time 25°C to Peak Temperature Pb-Free Assembly Large Body Small Body 3°C/second max. 150°C 200°C 60-180 seconds 3°C/second max 217°C 60-150 seconds 245 +0/-5°C 250 +0/-5°C 10-30 seconds 20-40 seconds 6°C/second max. 8 minutes max. Note: All temperatures refer to topside of the package. Measured on the body surface. Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 9 www.anpec.com.tw APW7037/A/B 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 , Itr > 100mA Carrier Tape & Reel Dimensions t D P Po E P1 Bo F W Ko Ao D1 T2 J C A B T1 Application SOP-8 A B 330±1 62 ± 1.5 F D C 12.75 +0.15 D1 J T1 T2 2 + 0.5 12.4 +0.2 2± 0.2 Po P1 5.5 ± 0.1 1.55 ±+0.1 1.55+0.25 4.0 ± 0.1 Application TSSOP-8 A B 330 ± 1 F P E 8± 0.1 1.75± 0.1 Ao W 12 + 0.3 - 0.1 Bo Ko t 2.0 ± 0.1 6.4 ± 0.1 5.2± 0.1 2.1± 0.1 0.3±0.013 J T1 T2 W P E 62 +1.5 C 12.75+ 0.15 2 + 0.5 12.4 ± 0.2 2 ± 0.2 12± 0. 3 8± 0.1 1.75±0.1 D D1 Po P1 Ao Bo Ko t 1.5 + 0.1 4.0 ± 0.1 2.0 ± 0.1 7.0 ± 0.1 3.6 ± 0.3 5.5 ± 0. 1 1.5 + 0.1 1.6 ± 0.1 0.3±0.013 (mm) Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 10 www.anpec.com.tw APW7037/A/B Cover Tape Dimensions Application SOP- 8 TSSOP- 8 Carrier Width 12 12 Cover Tape Width 9.3 9.3 Devices Per Reel 2500 2500 Customer Service Anpec Electronics Corp. Head Office : 5F, No. 2 Li-Hsin Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 Taipei Branch : 7F, No. 137, Lane 235, Pac Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, R. O. C. Tel : 886-2-89191368 Fax : 886-2-89191369 Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 11 www.anpec.com.tw