AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
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: service@aimtron.com.tw
3
Absolute Maximum Ratings
(Ta=+250C)
Rated ValueParameter Symbol Condition
Min. Max.
Unit
Power supply voltage VDD — — 6.5 V
LX pin voltage VLX — — 6.5 V
OUT output voltage VOUT — — 6.5 V
Other I/O pin voltage — — 6.5 V
LX pin output current ILX — — 2.5 A
LDO output Peak Current ILDO — — 400 mA
Allowable dissipation PDTSSOP8 — 500 mW
Operating temperature TOP — -30 +85
0C
Storage temperature Tstg — -55 +165
0C
WA R N I N G : Semiconductor devices can be permanently damaged by application of stress (voltage,
current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
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 0.8 1 - V
Power On Reset
Threshold VDD - 2 - V
AT1305,AT1305A 2.0 - 6 V
Operating V DD
Range VDD
AT1305B 1.6 6
No-Load Input
Current IIN1 IOUT=0mA - 87 -
ӴA
Switch- Off Input
Current IIN2 VIN=6V - 32 50
ӴA
Shutdown Current IIN3 EN=0V, /ENPB=High - - 1 ӴA
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
Constant on time FSVOUT =2.85V - 4.5 - ӴS
Maximum Duty DMAX VOUT =2.85V - 85 - %
LX ON Resistance RLX N-Channel - 0.3 - :