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AT1310
Preliminary Product Information MicroPower Charge Pump Converter Features
* Step-Up type Charge Pump * Input Range 2.7V to 5V * Low input current 25A * High Output Voltage Accuracy 4% * 100mA output current with VIN3.0V 50mA output current with VIN2.7V * High Frequency 750KHz operation * SOT-26 Package
General Description
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: service@aimtron.com.tw 1
AT1310
Preliminary Product Information MicroPower Charge Pump Converter
Pin Configuration(or Pin Assignment)
Ordering Information
Part number AT1310X AT1310X_PBF : Date Code *For more marking information, contact out sales representative directly Package SOT-26 SOT-26, PBF Marking Date Code ,Date Code with one bottom line
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: service@aimtron.com.tw 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 VIN VOUT VSHDN PD TOP Tstg
Condition -- -- -- -- -- --
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 Input Voltage No Load Supply Current Output Voltage Symbol VIN VStart VOUT VOUT =5.0V 2.7V< VIN <5.0V,IOUT=0mA, /SHDN=VIN 2.7V< VIN <5.0V ,IOUT50mA 3.0V< VIN <5.0V ,IOUT100mA 2.7V< VIN <3.6V ,IOUT=0mA, /SHDN=0V 3.6V< VIN <5.0V ,IOUT=0mA, /SHDN=0V VIN =3V, IOUT =50mA VIN =3V, IOUT =100mA Efficency Frequency /SHDN Input Threshold F VIH VIL IIH IIL OUT Turn-ON time Short-Circuit Current tON ISC /SHDN= VIN /SHDN= 0V VIN =3V, IOUT =0mA VIN =3V,VOUT =GND,/SHDN=3V VIN =3V, IOUT =50mA VIN =2.7V, IOUT =50mA Oscillator Free Running Condition Min. 2.7 4.8 4.8 1.4 -2 -2 Values Typ. 25 5.0 5.0 25 30 83 92 750 2 300 Max. VOUT 40 5.2 5.2 1 4 0.3 2 2 -
(Ta=+250C)
Unit V A V V A A mV mV % % KHz V V A A ms mA
Shutdown Current
ISHDN
Ripple Current
VRipple
/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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 10F for CIN and COUT, and 1F 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:
=
POUT VOUT x I OUT V = = OUT PIN VIN x 2 I OUT 2 x 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 0.037ref 0.075ref MAX 0.057 0.006 0.051 0.020 0.008 0.122 0.118 0.069 0.022 100
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: service@aimtron.com.tw 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 3C/second max.
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 5C of actual Peak Temperature (tP) Ramp-down Rate Time 25C to Peak Temperature
Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness 2.5mm or Pkg. 2.5mm or Pkg. volume 350mm3 volume 350mm3 3C/second max.
100C 150C 60-120 seconds
150C 200C 60-180 seconds 3C/second max.
183C 60-150 seconds 225+0/-5C 10-30 seconds 240+0/-5C 10-30 seconds
217C 60-150 seconds 245+0/-5C 10-30 seconds 250+0/-5C 20-40 seconds
6C/second max. 6 minutes max.
3C/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: service@aimtron.com.tw 11

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