AT1310 Preliminary Product Information MicroPower Charge Pump Converter Features General Description • Step-Up type Charge Pump • Input Range 2.7V to 5V • Low input current 25µA • High Output Voltage Accuracy ±4% • 100mA output current with VIN≥3.0V 50mA output current with VIN≥2.7V • High Frequency 750KHz operation • SOT-26 Package The AT1310 is a MicroPower switched-capacitor voltage converter that delivers a regulated output. No external inductor is required for operation. Using three small capacitors, the AT1310 can deliver up to 100mA to the regulated output. The AT1310 features very low quiescent current and high frequency over a large portion of its load range making this device ideal for battery-powered applications. Applications • Cellular Phones • LED Backlight Driver • DSC Flash Unit for IGBT trigger Level Block Diagram Aimtron reserves the right without notice to change this circuitry and specifications. 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 1 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Pin Configuration(or Pin Assignment) Ordering Information Part number AT1310X AT1310X_PBF Package SOT-26 SOT-26, PBF Marking Date Code ,Date Code with one bottom line : Date Code *For more marking information, contact out sales representative directly Pin Description Pin No. 1 2 3 4 5 6 Symbol OUT GND /SHDN CN VIN CP I/O O P I P + Description Regulated Output Ground Chip Enable Input Flying Capacitor negative terminal Input Supply Flying Capacitor positive terminal 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 2 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Absolute Maximum Ratings*1 (Ta=+250C) Parameter Power supply voltage OUT pin voltage SHDN pin voltage Allowable dissipation Operating temperature Storage temperature Symbol Condition VIN VOUT VSHDN PD TOP Tstg — — — — — — Rated Value Min. Max. — 6.0 — 6.0 — 6.0 — 150 -30 +85 -55 +125 Unit V V V mW 0 C 0 C 1. 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. Electrical Characteristics Parameter Symbol (Ta=+250C) Condition Min. Values Typ. Max. 2.7 - VOUT V Unit Input Voltage VIN VOUT =5.0V No Load Supply Current VStart 2.7V< VIN <5.0V,IOUT=0mA, /SHDN=VIN - 25 40 μA 5.0 5.2 V VOUT 2.7V< VIN <5.0V ,IOUT≤50mA 4.8 Output Voltage 3.0V< VIN <5.0V ,IOUT≤100mA 4.8 5.0 5.2 V - - 1 μA - - 4 μA VIN =3V, IOUT =50mA - 25 - mV VIN =3V, IOUT =100mA - 30 - mV VIN =3V, IOUT =50mA - 83 - % VIN =2.7V, IOUT =50mA - 92 - % Oscillator Free Running - 750 - KHz VIH 1.4 - - V VIL - - 0.3 V Shutdown Current Ripple Current Efficency Frequency /SHDN Input Threshold ISHDN VRipple η F 2.7V< VIN <3.6V ,IOUT=0mA, /SHDN=0V 3.6V< VIN <5.0V ,IOUT=0mA, /SHDN=0V IIH /SHDN= VIN -2 - 2 μA IIL /SHDN= 0V -2 - 2 μA OUT Turn-ON time tON VIN =3V, IOUT =0mA - 2 - ms Short-Circuit Current ISC VIN =3V,VOUT =GND,/SHDN=3V - 300 - mA /SHDN Input Current 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 3 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Typical characteristics : 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 4 AT1310 Preliminary Product Information MicroPower Charge Pump Converter 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 5 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Typical Application Schematic Fig1. Typical Charge Pump Boost Converter Circuit Fig2. 5V/100mA supply powered from a USB Port 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 6 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Fig3. LED Driver from a Li-Ion Battery Source 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 7 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Application Information 1. Capacitor Selection It is very important to select the capacitors CIN, COUT and CFLY because they will affect turn on time, output ripple and transient performance. Ceramic capacitors offer many advantages over other tantalum and aluminum electrolytic counterparts. In general, the capacitors can be used 10µF for CIN and COUT, and 1µF for CFLY under maximum output load conditions. Lower values for CIN, COUT and CFLY may be utilized for light load current applications. Large ceramic capacitors are typically composed of X7R, X5R, Z5U or Y5V dielectric materials. If Y5V and Z5U are selected for used with the charge pump, the nominal value should be doubled to compensated for the capacitor tolerance which can vary more than ±50% over operating temperature range. X7R and X5R dielectrics are much more desirable. The temperature tolerance of X7R dielectric is better than ±15% . 2. Charge Pump Efficiency The AT1310 is a regulated output voltage charger pump converter. The Efficiency can be defined as a linear voltage regulator with an effective output voltage that is equal to two times the input voltage. The expression to define the ideal efficiency can be shown as: η= POUT VOUT × I OUT V = = OUT PIN VIN × 2 I OUT 2 × VIN Refer to the Typical Characteristics section for measured plots of efficiency versus input voltage and output load current for the given charge pump output voltage options. 3. Layout Guideline As a general rule for charge pump boost converters, all external capacitors should be located as closed as possible to the device package with minimum length trace connections. A local component side ground plane is recommended. If this is not possible due to the layout limitations, assure good ground connections by the use of large or multiple PCB via’s. Refer to the following AT1310 evaluation board layout. ( Application Circuit Fig3.) 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 8 AT1310 Preliminary Product Information MicroPower Charge Pump Converter TopOverLayer BottomLayer TopLayer 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 9 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Small Outline SOT-26 SYMBOL A A1 A2 b C D E E1 L e e1 r INCHES MIN 0.035 0.000 0.035 0.010 0.003 0.110 0.102 0.059 0.014 00 MAX 0.057 0.006 0.051 0.020 0.008 0.122 0.118 0.069 0.022 0.037ref 0.075ref 100 MILLIMETERS MIN MAX 0.90 1.45 0.00 0.15 0.90 1.30 0.25 0.50 0.08 0.20 2.80 3.10 2.60 3.00 1.50 1.75 0.35 0.55 0.95ref 1.90ref 00 100 NOTES - - 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 10 AT1310 Preliminary Product Information MicroPower Charge Pump Converter Reflow Profiles Profile Feature Sn-Pb Eutectic Assembly Large Body Small Body Pkg. thickness Pkg. thickness <2.5mm or Pkg. ≥2.5mm or Pkg. 3 volume ≥350mm3 volume <350mm Average ramp-up rate (TL to TP) Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) Tsmax to TL -Ramp-up Rate Time maintained above: -Temperature (TL) -Time (tL) Peak Temperature(TP) Time within 5°C of actual Peak Temperature (tP) Ramp-down Rate Time 25°C to Peak Temperature 3°C/second max. Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness ≥2.5mm or Pkg. ≥2.5mm or Pkg. volume ≥350mm3 volume ≥350mm3 3°C/second max. 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds 3°C/second max. 183°C 60-150 seconds 217°C 60-150 seconds 225+0/-5°C 10-30 seconds 240+0/-5°C 10-30 seconds 6°C/second max. 6 minutes max. 245+0/-5°C 10-30 seconds 250+0/-5°C 20-40 seconds 3°C/second max. 8 minutes max. *All temperatures refer to topside of the package, measured on the package body surface. 7F, No.9, Park Avenue. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2/8/2006 REV:1.1 Email: [email protected] 11