AT1369 Preliminary Product Information 2-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 • 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 1.5mA • Built-in Power Good reset circuit • Input voltage: 2.5V ~7.0V Applications • Slim-Type CD-ROM/DVD-ROM/CD-RW • Power Supply for portable devices General Description The AT1369 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 AT1369 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 AT1369 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 Aimtron reserves the right without notice to change this circuitry and specifications. 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 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Pin Configuration Ordering Information Part number AT1369AR AT1369AR_GRE AT1369BR AT1369BR_GRE A: fosc =300KHz Package SSOP20 SSOP20,Green SSOP20 SSOP20,Green Marking AT1369AR AT1369AR, Date Code with one bottom line AT1369BR AT1369BR, Date Code with one bottom line B: fosc =600KHz Pin Description Symbol Pin No. Descript Symbol Pin No.(A/B) Descript FB1 1 SS2 11 COMP1 PVCC 2 3 SCP CTL 12 13 PDRV1 4 Inverting input to error amplifier 1 Error amplifier1 output Power blocks power supply Output1 for Pch-MOSFET VCC 14 NDRV1 NDRV2 PDRV2 5 6 7 Output1 for Nch-MOSFET GND Output2 for Nch-MOSFET RESET Output2 for Pch-MOSFET IN1 15 16 17 PGND COMP2 8 9 Power blocks ground Error amplifier1 output EI 3V3 18 19 Control blocks power supply Control blocks ground Power Good indicator VCC monitor voltage adjustable input pin Adjustable Reset input Output voltage 3.3V FB2 10 Inverting input to error amplifier 2 SS1 20 Sotf-start 1 Sotf-start 2 Short-Circuit protection Chip enable, high active 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 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Absolute Maximum Ratings Parameter Condition Power Supply Voltage — Source Average Current of PDRV1,NDRV1 — PDRV2,NDRV2 Sink Average Current of PDRV1,NDRV1, — PDRV2,NDRV2 Source Peak Current of PDRV1,NDRV1, — PDRV2,NDRV2 Sink Peak Current of PDRV1,NDRV1, — PDRV2,NDRV2 Input Voltage to Error Amplifier — Continuous power dissipation SSOP20（Ta=+25℃） Operating temperature — Storage temperature — Rated Value Min. Max. +8 -50 Unit V mA - 50 mA - -200 mA - 200 mA -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 AT1369 Preliminary Product Information 2-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 1.5 2.0 mA 10 µA V 1 10 mV 0.5 1.5 % -1.5 120 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 -1.0 160 Ta =-20℃ to +85℃ fT 10.0 VCOM 0.2 MHz 1.5 V fosc AT1369A 250 110 300 dB 350 KHz fosc AT1369B 500 600 700 KHz AV High Level Voltage 1.0 Low Level Voltage Variation with Power Supply Variation with temperature Charge Current of SS1,2 Invalid threshold voltage of SS1,2 Charge Current of SCP Threshold Voltage of SCP 0.5 ICSS1,2 ICSCP V V Vcc=2.5V to 7V 2 Ta =-20℃ to +85℃ 7 % -0.8 µA -1.5 -1.0 % 1.0 V -1.7 -1.25 -1.0 µA 0.9 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 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset PDRV1,2 Output Block Output source current Isource Duty≥95% PDRV=0V - -130 Output sink current Isink Duty≤5% PDRV=5V 65 100 ROH PDRV=-15mA 10 20 Ω ROL PDRV=15mA 10 20 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 10 20 Ω ROL NDRV=15mA 10 20 Ω VCC1 VCC V 0 VCC/ 2 V 20 µA Output ON resistor NDRV1,2 Output Block Output ON resistor Control Block CTL input voltage VIL CTL input Current VCC reset ON voltage RESET Monitor Block VIH ICTL Active mode Standby mode CTL=5.0V VRSTON1 VRSTON1 hys -100 3V3 reset ON voltage VRSTON2 2.94 3V3 reset hysteresis VRSTON2 hys -60 EI reset ON voltage VRSTON3 VOL Reset leakage current ILeak mA mA 3.0 V 100 mV 3.06 V 60 mV 1.12 1.22 1.32 VRSTON hys Reset output voltage mA 4.10 4.20 4.30 VCC reset hysteresis EI reset hysteresi -80 -100 IL =1mA - 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 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Typical Application Circuit: 3V3 and 2V 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] 6 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset CH1:PDRV2 CH2:NDRV2 CH3:Output 2.0V/1A(AC ripple) Fig1. Input 5V, Output 2.0V/1A 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 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset CH1:PDRV1 CH2:NDRV1 CH3:Output 3.3V/2A(AC ripple) Fig2. Input 5V, Output 3.3V/2A 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 AT1369 Preliminary Product Information 2-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] 9 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Vin=4 cell AA Battery 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 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset How to control CH1 and CH2 ON/OFF: 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 AT1369 Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Package Outline 20-pin SSOP SYMBOL A A1 A2 b C D E E1 L e y θ MILLIMETERS MIN TYP MAX 1.35 1.63 1.75 0.10 0.15 0.25 1.50 0.20 0.30 0.18 0.25 8.56 8.66 8.74 5.79 5.99 6.20 3.81 3.91 3.99 0.41 0.635 1.27 0.635 0.076 0° 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