AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Features • High efficiency (min. 90% On IO=300mA ~600mA) • Using external P and N channel MOSFET • Supports for down and up/down Zeta conversion • Maximum Duty 100% • Oscillation frequency 300KHz or 600KHz • Soft Start by an external capacity • Output voltage accuracy ±2% • Built-in ON/OFF Function • Built-in Short-circuit Protection • Stand-by current max. 10µA • Quiescent Current 1mA • Monitor the input voltage and 3V3 output • Input voltage: 2.5V ~7.0V Applications • Slim-Type CD-ROM/DVD-ROM/CD-RW • Power Supply for portable devices • Main or Sub Power source foe notebook computers and peripherals. General Description The AT1368 provides complete control and protection for a DC/DC converter optimized for high-performance microprocessor applications. It is designed to drive one P-Channel and one NChannel MOSFETs in a synchronous-rectified buck topology. The AT1368 integrates all of the control, output adjustment, monitoring and protection functions into a single package. The output voltage of the converter can be precisely regulated with a maximum tolerance of ±2% over temperature and line voltage variations. The AT1368 is a family of low-noise synchronous stepdown DC/DC converters that is ideally suited for systems powered from a 1-cell Li-ion battery or from a 3-cell to 4-cell NiCd, NiMH, or alkaline battery. It can also be used to USB-Based power system. Block Diagram 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 1 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Pin Configuration Ordering Information Part number AT1368A AT1368B AT1368B Package SSOP16 SSOP16 TSSOP16 Marking AT1368AR AT1368BR AT1368BP A: fosc =300KHz B: fosc =600KHz Pin Description Symbol Pin No. Descript Symbol Pin No.(A/B) Descript FB 1 SCP 9 Short-Circuit protection COMP PVCC 2 3 CTL NC 10 11 Chip enable, high active - PDRV 4 Inverting input to error amplifier Error amplifier output Power blocks power supply Output for Pch-MOSFET IN1 12 NDRV PGND 5 6 Output for Nch-MOSFET Power blocks ground RESET IN2 13 14 GND VCC 7 8 Control blocks ground Control blocks power supply SS 3V3 15 16 VCC monitor voltage adjustable input pin Power Good indicator 3V3 output monitor adjustable input pin Sotf-start Output voltage 3.3V 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 2 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Absolute Maximum Ratings Parameter Condition Power Supply Voltage Source Average Current of PDRV, NDRV Sink Average Current of PDRV, NDRV Source Peak Current of PDRV, NDRV Sink Peak Current of PDRV, NDRV Input Voltage to Error Amplifier Continuous power dissipation Operating temperature Storage temperature — — Rated Value Min. Max. +8 -50 Unit V mA — - 50 mA — - -200 mA — - 200 mA — SSOP16（Ta=+25℃） — — -30 -55 6.5 560 +85 +125 V mW 0 C 0 C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended Operating Conditions (Ta=+250C) Parameter Power supply voltage Control input voltage Operating temperature Symbol VCC VCTL TOP Values Min. 2.5 0 -20 Typ. --+25 Unit Max. 7 7 +85 Ｖ V °C 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 3 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Electrical Characteristics (VCC = 5V,Ta =+25℃ , unless otherwise noted. ) Parameter Symbol Condition Values Unit Min. Typ. Max. Input Supply Range VCC Quiescent Current ICC Current in standby mode IST Entire device Reference Voltage VREF Reference Voltage line-regulation VREF-Line Error amplifier Frequency Sawtooth wave oscillator (OSC) Soft-Start Short-Circuit Duty=50%, fOSC=600KHz PDRV/NDRV No Load CTL=0V Ta =-20℃ to +85℃ VIO IOH IOL 7.0 V 1.0 1.5 mA 10 µA V 1 5 mV 0.5 1.5 % 1.0 1.5 -160 -120 10 2.0 -80 mV mA μA 20 % 20 % VCC=2.5V to 7.0V VCOMP = VREF -0.5V VCOMP = 0.5V Ta =-20℃ to +85℃ -- 1.20 1.22 1.24 Ta =-20℃ to +85℃ Rference Variation with Temperature Input Offset Voltage Source Current Sink Current Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth Common Mode Input Voltage Range DC Open Loop Gain 2.5 Ta =-20℃ to +85℃ fT 10.0 VCOM 0.2 1.5 fosc AT1368A 250 110 300 fosc AT1368B 500 600 AV MHz V dB 350 KHz 700 KHz High Level Voltage 1.0 V Low Level Voltage Variation with Power Supply Variation with temperature Charge Current of SS Invalid threshold voltage of SS Charge Current of SS Threshold Voltage of SCP 0.5 V ICSS ICSS Vcc=2.5V to 7V 2 Ta =-20℃ to +85℃ 7 % % -1.0 µA 1.0 V -1.25 µA 1.0 V 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 4 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset PDRV Output Block Output source current Isource Duty≥95% PDRV=0V - -130 Output sink current Isink Duty≤5% PDRV=5V 65 100 ROH PDRV=-15mA 18 30 Ω ROL PDRV=15mA 16 25 Ω Output source current Isource Duty≥95% NDRV=0V - -130 -80 mA Output sink current Isink Duty≤5% NDRV=5V 65 100 ROH NDRV=-15mA 18 30 Ω ROL NDRV=15mA 16 25 Ω VIH Active mode 1.5 VCC V VIL Standby mode 0 0.8 V ICTL CTL=5.0V 20 µA Output ON resistor NDRV Output Block Output ON resistor Control Block CTL input voltage CTL input Current VCC reset ON voltage RESET Monitor Block VRSTON1 VCC rising VCC reset hysteresis VRSTON1 hys VCC falling 3V3 reset ON voltage VRSTON2 3V3 rising 3V3 reset hysteresis VRSTON2 hys 3V3 falling Reset output voltage VOL Reset leakage current ILeak IL =1mA -80 mA mA mA 4.10 4.20 4.30 2.94 3.0 V 100 mV 3.06 V 100 mV 0.4 V 2.0 µA 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 5 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Typical Application Circuit: 3V3 Output L1: AT1368A: 22µH/0.77A/104mΩ TDK-SLF6028T-220MR77 AT1368B: 10µH/1A/74.5mΩ TDK-SLF6028T-100M1R0 R1: AT1368A: 100K AT1368B: 10K 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 6 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 7 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Typical Application Circuit: 2V5 Output *1V8 Output: R4:9.8KΩ R5:38.7KΩ *Vin from 2.5V to 7V, disable SCP function 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 8 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Typical Application Circuit: Zeta converter 3V3 Output 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 9 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset CH1:Reset CH2:SS CH3:Vout CH4:Vin Fig.1 Vout:3.3V/1A Vin:5V Start-Up Waveform Fig.2 Vout:2.5V/1A Vin:3.1V Start-Up Waveform 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 10 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Package Outline 16-pin SSOP SYMBOL A A1 A2 b C D ZD E E1 L e y θ MILLIMETERS MIN TYP MAX 1.35 1.60 1.75 0.10 0.15 0.25 1.50 0.20 0.30 0.18 0.25 4.80 4.85 5.00 0.20 5.79 5.99 6.20 3.81 3.91 3.99 0.41 0.71 1.27 0.64 0.076 0° 8° MIN 0.053 0.004 0.008 0.007 0.189 0.228 0.150 0.016 0° INCHES TYP 0.063 0.006 0.191 0.008 0.236 0.154 0.028 0.025 - MAX 0.069 0.010 0.059 0.012 0.010 0.197 0.244 0.157 0.050 0.003 8° 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 11 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Package Outline 16-pin TSSOP SYMBOL A A1 A2 b C D E E1 L e y θ MILLIMETERS MIN TYP MAX 1.05 1.10 1.20 0.05 0.10 0.15 1.00 1.05 0.20 0.25 0.28 0.127 4.90 5.075 5.10 6.20 6.40 6.60 4.30 4.40 4.50 0.50 0.60 0.70 0.65 0.076 0° 8° MIN 0.041 0.002 0.008 0.193 0.244 0.170 0.020 0° INCHES TYP 0.043 0.004 0.039 0.010 0.005 0.1998 0.252 0.173 0.024 0.026 - MAX 0.047 0.006 0.041 0.011 0.200 0.260 0.177 0.028 0.003 8° 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 12 AT1368 1-Channel Synchronous Buck PWM Controller with Power Good Reset Reflow Condition (IR/Convection or VPR Reflow) Reference JEDEC Standard J-STD-020A Classification Reflow Profiles Convection or IR/Convction Average Heating Rate(180°C to peak) 5°C/second max. 120 seconds max. Preheat Temperature(125±20°C) 10~150 seconds Temperature maintained above 180°C Time within 5°C of actual Peak 10~20 seconds Temperature Peak Temperature Range(Note 1) 219~225°C or 235~240°C Cooling Rate 6°C /second max. 6 minutes max. Time 25°C to Peak Temperature VPR 10°C/second max. 60 seconds 219~225°C or 235~240°C 10°C/second max. *1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions. Package Reflow Conditions Pkg. Thickness ≥2.5mm Pkg. Thickness <2.5mm Pkg. Thickness <2.5mm and and and all bags 3 Pkg. Volume ≥350 mm Pkg. Volume <350 mm3 Convection 219~225°C VPR 219~225°C IR/Convection 219~225°C Convection 235~240°C VPR 235~240°C IR/Convection 235~240°C 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected] 13