View AT1369_689215.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset General Description
The AT1369 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 MOSFETs in a synchronous-rectified buck topology. The AT1369 integrates all of the control, output adjustment, monitoring 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 AT1369 is a family of low-noise synchronous stepdown 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.
Features
* High efficiency (min. 90% On IO=300mA ~600mA) * Using external P and N channel MOSFET * Maximum Duty 100% * Oscillation frequency 300KHz or 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 1.5mA * Built-in Power Good reset circuit * Input voltage: 2.5V ~7.0V
Applications
* Slim-Type CD-ROM/DVD-ROM/CD-RW * 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
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Pin Configuration
Ordering Information
Part number AT1369AR AT1369AR_GRE AT1369BR AT1369BR_GRE A: fosc =300KHz Package SSOP20 SSOP20,Green SSOP20 SSOP20,Green B: fosc =600KHz Marking AT1369AR AT1369AR, Date Code with one bottom line AT1369BR AT1369BR, Date Code with one bottom line
Pin Description
Symbol Pin No. Descript Symbol Pin No.(A/B) Descript
FB1 COMP1 PVCC PDRV1 NDRV1 NDRV2 PDRV2 PGND COMP2 FB2
1 2 3 4 5 6 7 8 9 10
Inverting input to error amplifier 1 Error amplifier1 output Power blocks power supply Output1 for Pch-MOSFET
SS2 SCP CTL VCC
11 12 13 14 15 16 17 18 19 20
Sotf-start 2 Short-Circuit protection Chip enable, high active Control blocks power supply Control blocks ground Power Good indicator VCC monitor voltage adjustable input pin Adjustable Reset input Output voltage 3.3V Sotf-start 1
Output1 for Nch-MOSFET GND Output2 for Nch-MOSFET RESET Output2 for Pch-MOSFET IN1 Power blocks ground Error amplifier1 output Inverting input to error amplifier 2 EI 3V3 SS1
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
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Absolute Maximum Ratings
Parameter Condition Rated Value Min. Max. +8 -50 -30 -55 50 -200 200 6.5 560 +85 +125 Unit V mA mA mA mA V mW 0 C 0 C
Power Supply Voltage -- Source Average Current of PDRV1,NDRV1 -- PDRV2,NDRV2 Sink Average Current of PDRV1,NDRV1, -- PDRV2,NDRV2 Source Peak Current of PDRV1,NDRV1, -- PDRV2,NDRV2 Sink Peak Current of PDRV1,NDRV1, -- PDRV2,NDRV2 Input Voltage to Error Amplifier -- Continuous power dissipation SSOP20Ta=+25 Operating temperature -- Storage temperature --
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. 7 7 +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
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset 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 Sawtooth wave oscillator (OSC) High Level Voltage Low Level Voltage Variation with Power Supply Variation with temperature Charge Current of SS1,2 Invalid threshold voltage of SS1,2 Charge Current of SCP Threshold Voltage of SCP
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 7.0V Ta =-20 to +85
Values Min. Typ. Max. -1.5 7.0 2.0 10 1.20 1.22 1.24 1 0.5 -1.0 160 -1.5 120 10 1.5 10 -2.0 80 20 20 10.0 0.2 1.5 110 300 600 1.0 0.5
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 fosc AT1369A AT1369B 250 500
dB 350 KHz 700 KHz V V 2 7 % % A V A V
Vcc=2.5V to 7V Ta =-20 to +85 ICSS1,2 -1.5 -1.0 1.0 ICSCP
-0.8
Soft-Start
-1.7 -1.25 -1.0 0.9
Short-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 4
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset
PDRV1,2 Output Block Output source current Output sink current Output ON resistor Output source current NDRV1,2 Output Block Output sink current Output ON resistor Isource Isink ROH ROL Isource Isink ROH ROL VIH VIL CTL input Current VCC reset ON voltage VCC reset hysteresis RESET Monitor Block 3V3 reset ON voltage 3V3 reset hysteresis EI reset ON voltage EI reset hysteresi Reset output voltage Reset leakage current ICTL VRSTON1 VRSTON1 hys VRSTON2 VRSTON2 hys VRSTON3 VRSTON hys VOL ILeak IL =1mA Duty95% PDRV=0V Duty5% PDRV=5V PDRV=-15mA PDRV=15mA Duty95% NDRV=0V Duty5% NDRV=5V NDRV=-15mA NDRV=15mA Active mode Standby mode CTL=5.0V VCC1 0 65 65 -130 100 10 10 -130 100 10 10 20 20 VCC VCC/ 2 20 4.10 4.20 4.30 -100 2.94 -60 3.0 100 3.06 60 20 20 -80 -80 mA mA mA mA V V A V mV V mV V MV V A
Control Block
CTL input voltage
1.12 1.22 1.32 -100 100 0.4 2.0
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
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Typical Application Circuit: 3V3 and 2V Output
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
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset
CH1:PDRV2
CH2:NDRV2
CH3:Output 2.0V/1A(AC ripple)
Fig1. Input 5V, Output 2.0V/1A
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
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset CH1:PDRV1 CH2:NDRV1 CH3:Output 3.3V/2A(AC ripple)
Fig2. Input 5V, Output 3.3V/2A
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
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset
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 9
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset
Vin=4 cell AA Battery
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 10
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset
How to control CH1 and CH2 ON/OFF:
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 11
AT1369
Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset
Package Outline
20-pin SSOP
SYMBOL A A1 A2 b C D E E1 L e y
MILLIMETERS MIN TYP MAX 1.35 1.63 1.75 0.10 0.15 0.25 1.50 0.20 0.30 0.18 0.25 8.56 8.66 8.74 5.79 5.99 6.20 3.81 3.91 3.99 0.41 0.635 1.27 0.635 0.076 0 8
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 12

▲Up To Search▲

Price & Availability of AT1369

	To Download AT1369 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .