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AT1391
Preliminary Product Information 1-Channel Step-Down PWM Controller Features
* High efficiency * Using external P channel MOSFET * Maximum Duty 100% * Oscillation frequency 600KHz * Soft Start by an external capacity * Output voltage accuracy 2% * Built-in ON/OFF Function * Built-in Short-circuit Protection * Stand-by current max. 10A * Quiescent Current 1mA * Input voltage: 2.5V ~7.0V
General Description
The AT1391 provides complete control and protection for a DC/DC converter optimized for high-performance microprocessor applications. It is designed to drive one P-Channel in a buck topology. The AT1391 integrates all of the control, output adjustment, and protection functions 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 AT1391 is a family of low-noise step-down DC/DC converters that is ideally suited for systems powered from a 1-cell Li-ion battery or from a 3-cell to 4-cell NiCd, NiMH, or alkaline battery. It can also be used to USB-Based power system.
Applications
* Power Supply for portable devices
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 1
AT1391
Preliminary Product Information 1-Channel Step-Down PWM Controller
Pin Configuration
Ordering Information
Part number AT1391P AT1391P_GRE Package TSSOP8 TSSOP8, Green Marking AT1391P AT1391P, date code with one bottom line
*For more marking information, contact our sales representative directly
Pin Description
Symbol Pin No. Descript Symbol Pin No.(A/B) Descript
GND VCC SCP CTL
1 2 3 4
Control blocks ground Power blocks power supply Short-Circuit protection Chip enable, high active
SS FB COMP OUT
5 6 7 8
Sotf-start Error amplifier inverting input Error amplifier output Output for Pch-MOSFET
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 2
AT1391
Preliminary Product Information 1-Channel Step-Down PWM Controller Absolute Maximum Ratings*1
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 ESD Susceptibility *2 Condition -- -- -- -- -- -- TSSOP8Ta=+25 -- -- HBM MM Rated Value Min. Max. +7 -50 50 -200 200 6.5 500 -30 +85 -55 +125 2 200 Unit V mA mA mA mA V mW 0 C 0 C KV V
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.
2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF capacitor discharged
through a 1.5K resistor into each pin
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
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 3
AT1391
Preliminary Product Information 1-Channel Step-Down 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 Charge Current of SS Threshold Voltage of SCP Output source current
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 A V mA
Vcc=2.5V to 6V Ta =-20 to +85 ICSS -1.0 1.0 ICSCP
Soft-Start
-1.5 -1.25 -1.0 0.8 0.9 -130 1.0 -80
Short-Circuit
Isource
Duty95% OUT=0V
-
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 4
AT1391
Preliminary Product Information 1-Channel Step-Down PWM Controller
Output Block Output sink current Output ON resistor Isink ROH ROL VIH VIL ICTL Duty5% OUT=5V OUT=-15mA OUT=15mA Active mode Standby mode CTL=5.0V 2.0 0 65 100 18 16 30 25 VCC 0.5 20 mA V V A
Control Block
CTL input voltage CTL input Current
Application Circuit
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 5
AT1391
Preliminary Product Information 1-Channel Step-Down PWM Controller
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 6
AT1391
Preliminary Product Information 1-Channel Step-Down PWM Controller
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 7
AT1391
Preliminary Product Information 1-Channel Step-Down 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 -
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 8
AT1391
Preliminary Product Information 1-Channel Step-Down PWM Controller Reflow Condition (IR/Convection or VPR Reflow)
Classification Reflow Profiles
Profile Feature Average ramp-up rate (TL to TP) Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) Time maintained above: -Temperature (TL) -Time (tL) Peak/Classification Temperature(TP) Time within 5C of actual Peak Temperature (tP) Ramp-down Rate Time 25C to Peak Temperature Sn-Pb Eutectic Assembly 3C/second max. Pb-Free Assembly 3C/second max.
100C 150C 60-120 seconds 183C 60-150 seconds See table 1 10-30 seconds 6C/second max. 6 minutes max.
150C 200C 60-180 seconds 217C 60-150 seconds See table 2 10 seconds max. 6C/second max. 8 minutes max.
*All temperatures refer to topside of the package, measured on the package body surface.
Classification Reflow Profiles(Cont.)
Table 1. SnPb Entectic Process -Package Peak Reflow Temperatures Package Thickness <2.5mm 2.5mm Volume mm <350 240+0/-5 225+0/-5
3 3
Volume mm3350 225+0/-5 225+0/-5 Volume mm3>2000 260+0 245+0 245+0
Table 2. Pb-free Process -Package Classification Reflow Temperatures Package Thickness <1.6mm 1.6mm - 2.5mm 2.5mm Volume mm <350 260+0 260+0 250+0 Volume mm3 350-2000 260+0 250+0 245+0
*Tolerance: The device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means Peak reflow temperature +0. For example 260+0) at the rated MSL level.
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 3/15/2006 REV:1.1 Email:service@aimtron.com.tw 9

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