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AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Features
* 0.8V Low Start-Up Input Voltage * Up to 90%Efficiency * Adjustable 100mA Output with 1 Alkaline Cell or 200mA Output with 2 Alkaline Cell Battery input. * 1.8V/3.0V/3.3V/300mA Output with USB Power input. * Small Number of External Components needed * Load Disconnects from Input in Shutdown * Power good output * 32A Quiescent(Switch OFF) Supply current * 1A Shutdown Mode Supply current * 8-Pin TSSOP package
General Description
The AT1305 is a PFM step-up DC/DC converter with LDO for applications using 1 Cell or 2 Cell Alkaline battery and USB applications. Besides, the 32A low quiescent current together with high efficiency maintains long battery life time. It provides a constant output voltage for inputs that vary above and below the output voltage.
Applications
* MP3 * Power source for battery-powered equipment * Power source for cameras, camcorders, VCRs, PDAs, electronic data banks, and hand-held Communication equipment
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
AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO
Pin Configuration
Ordering Information
Part number AT1305 AT1305_GRE AT1305 A AT1305 A_GRE AT1305 B AT1305 B_GRE Package 8-pin Plastic TSSOP 8-pin Plastic TSSOP, Green 8-pin Plastic TSSOP 8-pin Plastic TSSOP, Green 8-pin Plastic TSSOP 8-pin Plastic TSSOP, Green Remarks Date Code ,Date Code with one bottom line Date Code ,Date Code with one bottom line Date Code ,Date Code with one bottom line
AT1305:LDO set to 3.3V
AT1305AP:LDO set to 3.0V AT1305BP:LDO set to 1.8V
*For more marking information, contact our sales representative directly
Pin Description
Pin No. Symbol I/O Description
1 2 3 4 5 6 7 8
LX EN /ENPB GND PG FB OUT VDD
O I I O I O -
Switching Output Enable Control Input, active high Enable Control Input, active low Ground Power Good Detected Step-Up Converter feedback input Output Power input
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AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Absolute Maximum Ratings*1
(Ta=+250C)
Parameter Power supply voltage LX pin voltage OUT output voltage Other I/O pin voltage LX pin output current LDO output Peak Current Allowable dissipation Operating temperature Storage temperature
Symbol VDD VLX VOUT ILX ILDO PD TOP Tstg
Condition -- -- -- -- -- -- TSSOP8 -- --
Rated Value Min. Max. -- 6.0 -- -- -- -- -- -- -30 -55 6.0 6.0 6.0 2 400 500 +85 +165
Unit V V V V A mA mW
0 0
C 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
(VIN=1.0V, VOUT =2.8V, IOUT=0mA ,Ta=+250C)
Parameter
Symbol
Condition Min.
Values Typ. 0.8 2 Max. 5.5 5.5 87 32 1 1.2 1.75 50 10 1.224 50 -
Unit
Start-Up Voltage Power On Reset Threshold Operating V DD Range No-Load Input Current Switch- Off Input Current Shutdown Current Feedback Reference FB Input Current LX Switch On-time
VST VDD VDD IIN1 IIN2 IIN3 VFB IFB FS
IOUT=1mA
0.7 -
V V V V A A A V nA S
AT1305,AT1305A AT1305B IOUT=0mA VIN=5V EN=0V, /ENPB=High Close Loop VDD =2.85V VFB =1.2V VOUT =2.85V
2.0 1.65 1.176 -
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AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO
Maximum Duty LX ON Resistance LX Leakage Current Current Limit Setting LDO Current Limit OUT ON Resistance LDO enable threshold LDO Line Regulation LDO Load Regulation PG Threshold PG sink current PG Leakage current EN,/ENPB Trip Level VDD2 IPG ILPG VIH VIL DMAX RLX IL ILX ILDO ROUT VDD1 VOUT =2.85V N-Channel VLX =1.5V, EN=0V,/ENPB=VDD VDD =2.85V VDD =3.2V VDD =2.85V, IOUT=100mA OUT regulated to 1.8/3.0/3.3V Vin=4.5V~5.5V, IOUT=100mA Vout=3.3V, IOUT=10~100mA AT1305,AT1305A, falling AT1305B, VDD falling IPG=1mA VDD =3V VDD 0.8 1.5 350 0.5 4.0 1 1 2.7 1.65 0.4 85 0.3 1 2 1 0.5 % A A mA V % % V V V A V V
Note 1 : Once the output is in regulation , the AT1305/A/B operate down to a 0.7V input voltage.
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
AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Operating Charateristics
Boost Converter Line Transient Response
Boost Converter Line Transient Response
Boost Converter Load Transient Response
Boost Converter Load Transient Response
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AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO
LDO Line Transient Response LDO Load Transient Response
Boost Converter Start-up After Enable
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
AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Application Circuit 1Cell And USB Power Input
1Cell or USB Power Input
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
AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Typical Operating Charateristics 1Cell and USB Power Input
Efficiency (Load at LDO output) 90 85 80 75 70 0 L=33uH VDD=2.91V Iout=100mA 1.1 1.2 1.3 1.4 1.5 Vin(V)
0.9 1.0
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AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO 2Cell And USB Power Input
Efficiency (Load at LDO output) 95 90 85 80 75 0 L=33uH VDD=3.3V Iout=100mA 2.0 2.2 2.4 2.6 2.8 3.0 Vin(V)
1.8
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AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO Function Description Boost Converter The AT1305 integrates a step-up, switch-mode DC/DC converter with a linear regulator to provide step up/down voltage conversion. A pulse frequency modulation (PFM) with a constant on time 4.5us and minimum off-time 1.4s controls the N-channel MOSFET. The linear regulator contains a P-channel MOSFET. In 1-cell or 2-cell battery input (When VBAT R1 VDD = VFB 1 + R2 R1 = 1.2 x (1 + ) R2
The maximum efficiency could be 89% over 50mA load range. The AT1305 guarantee starts up as low as 1.0V input.
LDO mode
The low-dropout linear regulator consists of a reference, an error amplifier and a P-channel MOSFET. In USB mode, when VIN>4V, the linear regulator is active automatically whether the EN and /ENPB is enabled or not. The output voltage is default 3.3V, 3.0V and 1.8V version. Its driving capability is nearly 250mA.
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
AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO
Power good The PG pin stays high impedance when the dc/dc converter or the LDO output voltage high than 2.7 V, and falling down when the voltage low than 2.6V. It could be used to enable the processor after the push-button start-up.
On/Off Control A single pushbutton switch can be used to turn the AT1305 on and off. EN is pulled low (internal) and /ENPB is pulled high when the AT1305 is off. When the switch is pressed, /ENPB is pulled low and the IC turns on. The switch should be on long enough for the processor to exit reset. The controller issues a logic high to EN, which guarantees the IC will stay on regardless of the switch state.
EN 0 0 1 1
/ENPB 0 1 0 1
AT1305 ON OFF ON ON
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
AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO
Package Outline : 8-pin TSSOP
SYMBOL A B C D E F H K M
INCHES MIN MAX 0.114 0.122 0.169 0.177 0.244 0.260 0.026 BSC 0.010 0.012 0.002 0.006 0.041 0.047 0.005 BSC 0.020 0.028 80 00
MILLIMETERS MIN MAX 2.90 3.10 4.30 4.50 6.20 6.60 0.65 BSC 0.25 0.30 0.05 0.15 1.05 1.20 0.127 BSC 0.50 0.70 00 80
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 12
AT1305
Preliminary Product Information PFM Step-Up DC/DC Converter with LDO 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 13

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