AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
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
Absolute Maximum Ratings*1
(Ta=+250C)
Rated Value Parameter
Symbol
Condition
Min. Max.
Unit
Power supply voltage VDD — — 6.0 V
LX pin voltage VLX
— — 6.0 V
OUT output voltage VOUT — — 6.0 V
Other I/O pin voltage — — 6.0 V
LX pin output current ILX
— — 2 A
LDO output Peak Current ILDO — — 400 mA
Allowable dissipation PD TSSOP8 — 500 mW
Operating temperature TOP — -30 +85
0C
Storage temperature Tstg — -55 +165
0C
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)
Values
Parameter Symbol Condition
Min. Typ. Max.
Unit
Start-Up Voltage VST I
OUT=1mA 0.7 0.8 - V
Power On Reset
Threshold VDD - 2 - V
AT1305,AT1305A 2.0 - 5.5 V
Operating V DD
Range VDD
AT1305B 1.65 5.5 V
No-Load Input
Current IIN1 IOUT=0mA - 87 -
μA
Switch- Off Input
Current IIN2 VIN=5V - 32 50
μA
Shutdown Current IIN3 EN=0V, /ENPB=High - 1 10 μA
Feedback Reference VFB Close Loop VDD =2.85V 1.176 1.2 1.224 V
FB Input Current IFB V
FB =1.2V - - 50 nA
LX Switch On-time FS VOUT =2.85V - 1.75 - μS