at1799 Aimtron Technology, at1799 Datasheet
at1799
Available stocks
Related parts for at1799
at1799 Summary of contents
Page 1
... Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator Description AT1799 is a voltage-mode PWM step-down DC-DC converter capable of driving loads over a wide input supply range with excellent line and load regulation characteristics. High efficiency is obtained through the use of a low Rds(on) P-channel power switch ...
Page 2
... Enable input digital input that turns the regulator on/off. Drive high to turn on the regulator, drive it low to turn it off. Error Amplifier Output. A series RC network connected to this pin 3 COMP O compensates AT1799. Feedback Input. Connect a resistive divider from switching output ground. 5,6 GND P Ground ...
Page 3
... Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator Rated Value -0 IN+1 -0 )*2 105 JA 150 260 -65~150 HBM 2 MM 200 Values Min. Typ. Max. 4.75 12 -20 +25 WWW: Email: 3 AT1799 unit ℃/W ℃ ℃ ℃ Unit 16 V +85 ℃ http://www.aimtron.com.tw service@aimtron.com.tw ...
Page 4
... I EN =GND SHDN f Ta=+25℃ SW FB=0V V Ta=+25℃ =1.215V FB=1.0V MAIN D FB=1.5V MIIN R I =2A SW-DS(ON IN=13.5V,V =GND EN=0V 0 A<I < 4.75V < IN<16V Hysteresis 150mV EN=0V WWW: Email: 4 AT1799 Min. Typ. Max. Units 4. 3.8 4.2 4 500 - 380 440 KHz - 42 - KHz 1.20 1.215 1.233 V - 2.5 2.75 ...
Page 5
... No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator rre Reference Voltage vs Temperature Temperature ( C) WWW: 5 AT1799 http://www.aimtron.com.tw service@aimtron.com.tw Email: ...
Page 6
... Ch2:Vout, Ch4:Iout, Time:1ms/div VIN=7V to 14V, Vout=5.0V, L=22uH, Iout=200mA Ch2:Vout, Ch3:VIN, Time:0.5s/div 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator Load Transient Response Line Transient Response WWW: Email: 6 AT1799 http://www.aimtron.com.tw service@aimtron.com.tw ...
Page 7
... Typical Application Circuit 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator http://www.aimtron.com.tw WWW: service@aimtron.com.tw Email: 7 AT1799 ...
Page 8
... When EN control is not required that it should be left open circuited. Soft-Start AT1799 is built-in soft-start function. When power up, after input voltage is above the under-voltage lockout threshold, then soft-start allows a gradual increase of COMP voltage to get to a steady state operating point. Therefore, reducing input surge currents. During this time, the COMP voltage increases and the output duty cycle is allowed to increase from zero to the value required for regulation ...
Page 9
... MOS. The current-limit feature protects against a hard short or over current fault at the output. Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the AT1799. When the junction temperature exceeds Tj=160 ℃ down the IC, allowing the IC to cool. Once the device cools down by 15 automatically recover normal operation ...
Page 10
... No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator − × ∆ × OSC . PEAK WWW: Email: 10 AT1799 http://www.aimtron.com.tw service@aimtron.com.tw ...
Page 11
... OUT OSC For low ESR ceramic capacitors, the output ripple is dominated by the charging or 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator http://www.aimtron.com.tw WWW: service@aimtron.com.tw Email: 11 AT1799 ...
Page 12
... In addition the capacitance and the ESR value create a zero. These frequency response effects together with the internal frequency compensation circuitry of AT1799 modify the gain and phase shift of the closed loop system. ...
Page 13
... No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator http://www.aimtron.com.tw WWW: service@aimtron.com.tw Email: 13 AT1799 ...
Page 14
... No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator MILLIMETERS MAX MIN 0.197 4.80 0.158 3.80 0.244 5.80 BSC 1.27 BSC 0.020 0.33 0.010 0.10 0.069 1.35 0.019 0.28 0.010 0.19 0.050 0. WWW: 14 AT1799 NOTES MAX 5.00 - 4. 0.51 - 0.25 - 1.75 - 0.48 0.25 1. http://www.aimtron.com.tw service@aimtron.com.tw Email: ...