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AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller General Description
The AT1392 provides complete control and protection for a DC/DC converter optimized for high-performance microprocessor applications. It is designed to drive one P-Channel and one NChannel in a buck topology. The AT1392 integrates all of the control, output adjustment into a single package. The output voltage of the converter can be precisely regulated with a maximum tolerance of 2% over temperature and line voltage variations. The AT1392 is a family of low-noise synchronous step-down DC/DC converters that is ideally suited for systems powered from a 1-cell Li-ion battery or from a 3cell to 4-cell NiCd, NiMH, or alkaline battery. It can also be used to USB-Based power system.
Features
* High efficiency * Using external P and N channel MOSFET * Maximum Duty 100% * Oscillation frequency 600KHz * Soft Start by an external capacity * Output voltage accuracy 2% * Built-in ON/OFF Function * Stand-by current max. 10A * Quiescent Current 1mA * Input voltage: 2.5V ~7.0V
Applications
* Power Supply for portable devices
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
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 1
AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller
Pin Configuration
Ordering Information
Part number AT1392P AT1392P_GRE Package TSSOP8 TSSOP8, Green Marking AT1392P AT1392P, date code with one bottom line
Pin Description
Symbol Pin No. Descript Symbol Pin No.(A/B) Descript
OUTN AGND VCC CTL
1 2 3 4
Output for Nch-MOSFET Power Ground Power Supply ON-OFF Control
SS FB COMP OUTP
5 6 7 8
Sotf-Start Error amplifier inverting input Error amplifier output Output for Pch-MOSFET
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 2
AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller
Absolute Maximum Ratings
Parameter Power Supply Voltage Source Average Current of OUT Sink Average Current of OUT Source Peak Current of OUT Sink Peak Current of OUT Input Voltage to Error Amplifier Continuous power dissipation Operating temperature Storage temperature Condition -- -- -- -- -- -- TSSOP8Ta=+25 -- -- Rated Value Min. Max. +7 -50 50 -200 200 6.5 500 -30 +85 -55 +125 Unit V mA mA mA mA V mW 0 C 0 C
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.
Recommended Operating Conditions
(Ta=+250C)
Parameter Power supply voltage Control input voltage Operating temperature
Symbol VCC VCTL TOP Min. 2.5 0 -20
Values Typ. --+25 Max. 6 6 +85
Unit V C
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
AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller
Electrical Characteristics
(VCC = 5V,Ta =+25 , unless otherwise noted. )
Parameter Input Supply Range Quiescent Current Current in standby mode Entire device Reference Voltage Reference Voltage line-regulation Rference Variation with Temperature Input Offset Voltage Source Current Sink Current Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth Common Mode Input Voltage Range DC Open Loop Gain Frequency High Level Voltage Sawtooth wave oscillator (OSC) Low Level Voltage Variation with Power Supply Variation with temperature Charge Current of SS Invalid threshold voltage of SS Output source current Output sink current Output ON resistor
Symbol VCC ICC IST VREF VREF-Line
Condition 2.5 Duty=50%, fOSC=600KHz PDRV/NDRV No Load CTL=0V Ta =-20 to +85 VCC=2.5V to 6.0V Ta =-20 to +85
Values Min. Typ. Max. -1.0 6.0 1.5 10 1.20 1.22 1.24 1 0.5 -1.0 160 -1.5 120 5 1.5 10 -2.0 80 20 20 10.0 0.2 500 110 600 1.0 0.5 1.5
Unit V mA A V mV % mV mA A % % MHz V
VIO IOH IOL
VCOMP = VREF -0.5V VCOMP = 0.5V Ta =-20 to +85 Ta =-20 to +85
Error amplifier
fT VCOM AV fosc
dB 700 KHz V V 2 7 % % A V -80 mA mA 30 25
Vcc=2.5V to 6V Ta =-20 to +85 ICSS -1.0 1.0 Isource Isink ROH ROL Duty95% OUT=0V Duty5% OUT=5V OUT=-15mA OUT=15mA 65 -130 100 18 16
Soft-Start
Output Block
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 4
AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller
CTL input voltage CTL input Current VIH VIL ICTL Active mode Standby mode CTL=5.0V 2.0 0 VCC 0.5 20 V V A
Control Block
Application Circuit
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 5
AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller
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 6
AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller
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 7
AT1392
Preliminary Product Information 1-Channel Synchronous Buck PWM Controller
Small 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 -
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 8

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