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AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator Features
3.3V and 5V output versions Guaranteed 3A output load current Requires small number ofexternal components Excellent line and load regulation 150kHz fixed frequency internal oscillator Built-in TTL On/Off Control Low power standby mode, IQ typically 80uA Built-in current limit protection Built-in thermal shutdown circuit. Operating voltage: 4.5V~25V TO-265 package
Description
The AT1796 series of regulators are step-down (buck) DC/DC converter, capable of driving a 3A load with excellent line and load regulation. Requiring a minimum number of external components, these regulators are simple to use . The AT1796 series operates at a switching frequency of 150kHz.Available in a standard 5-lead TO-263 surface mount package. It include a guaranteed 4% tolerance on output voltage under specified input voltage and output load conditions, and 15% on the oscillator frequency.
Applications
High-efficiency step-down regulator TFT Scalar Board On-card switching regulators
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 1
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator Pin Configuration
Ordering Information
Part number AT1796-50 AT1796-50_PBF AT1796-33 AT1796-33_PBF AT1796-ADJ AT1796-ADJ_PBF Package TO-265(5.0V version) TO-265(5.0V version),PB-Free TO-265(3.3V version) TO-265(3.3V version),PB-Free TO-265(ADJ version) TO-265(ADJ version),PB-Free Marking AT1796-50A AT1796-50A,date code with one bottom line AT1796-33A AT1796-33A,date code with one bottom line AT1796-ADJ AT1796-ADJ,date code with one bottom line
*For more marking information, contact our sales representative directly
Pin Description
Symbol VCC OUT GND FB SHDN Pin No. 1 2 3 4 5 Descript Power Supply Switch Node Connection to Inductor Power ground Output Feedback ON/OFF Control
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 2
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator
Absolute maximum ratings
Parameter Power supply voltage SHDN pin input voltage Power dissipation Operating Junction Temperature Storage temperature Thermal Resistance from Junction to Ambient Thermal Resistance from Junction to Case Lead Temperagture(Soldering, 5sec.) ESD Susceptibility *2 Symbol VCC VSHDN Pd TJ Tstg JA JC HBM MM Limits 30 -0.3~+25 Internally Limited -30~+125 -65~+150 19.4 7.7 260 2 200 unit V V W o C o C o C/W o C/W o 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.
3. JA is measured with the component mounted on an evaluation PC board in free air that required area of copper is 2.5in2 (1 oz.)or larger.
the
Recommended operating conditions (TA = 25oC)
Parameter Power supply voltage SHDN pin input voltage Symbol VCC VSHDN Limits 4.5~28 0~+20 unit V V
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 3
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator
Electrical characteristics
(VCC = 12V , Ta =+25 , unless otherwise noted. )
Parameter
Quiescent Current Stand-by quiescent Current SHDN pin logic input voltage threshold SHDN pin logic input current Output voltage Efficiency Output voltage Efficiency FB voltage Efficiency Saturation voltage Oscillator frequency Maximum duty cycle Minimum duty cycle Current limit
Symbol
IOC ISQC VIL VIH IIL IIH VOUT
Condition
Values Unit Min. Typ. Max.
-5 80 --0.02 5 3.3 -10 200 0.6 -5 15 3.432 -mA A V V A A V %
SHDN = 5V Active mode Standby mode Active mode Standby mode 4.75 Vcc 28V 0.2A ILOAD 3A Vin = 12V , ILOAD = 3A
--2.0 --3.168 73
VOUT
4.75 Vcc 28V 0.2A ILOAD 3A Vin = 12V , ILOAD = 3A 4.75 Vcc 28V 0.2A ILOAD 3A Vin = 12V , ILOAD = 3A , VOUT = 3V ILOAD = 3A
4.8 --
5.0 80
5.2 --
V %
VFB
1.193 --
1.230 73
1.267 --
V %
VSAT FOSC DMAX DMIN ICL IL1 IL2
-127
1.15 150 100 0 4.5 50 2
1.5 173 --5.0 -30
V kHz % % A A mA
FB = 0V FB = 3.3V or 5V Peak current No diode . capacitor , inductor FB = 12V , Switching OFF , OUT = 0V Vcc =28V
--3.6 ---
Output leakage current
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 4
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator
CH1:SHDN
CH2:5V Output
CH3:OUT CH4:IIN
Fig1. 5V/2A Output
Fig2. 5V/3A Output
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 5
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator Typical Performance Characteristics:
Continuous mode switching waveforms VIN=20V VOUT=5V ILOAD=2A L=33H COUT=220F COUT ESR=50m Discontinuous mode switching waveforms VIN=20V VOUT=5V ILOAD=90mA COUT=220F COUT ESR=50m L=33H
Load transient response for continuous mode VIN=20V VOUT=5V ILOAD=500mA to 2A L=33H COUT=220F COUT ESR=50m
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 6
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator Adjustable Output Application Example :
VOUT = V FB (1 +
V FB = 1.23V
R2 ) R1
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 7
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator 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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 8
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 9
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator Application Data :
Quick Design Component Selection Table
Input/Output Condition Output Voltage (V) 5 Load Current (A) 3 Max. Input Voltage (V) 8 15 25 9 15 25 5 12 25 6 12 25 Inductor Inductance (H) 22 33 47 22 68 68 22 22 33 22 33 47 Current (A) 3.5 3.5 3.5 3.1 3.1 3.1 3.5 3.5 3.5 3.1 3.1 3.1 Output Capacitor(F/V) Through Hole electrolytic Surface Mount Tantalum Nichicon Panasonic Sprague AVX TPS PL Series HFQ Series 595D Series Series 560/25 330/35 270/35 560/16 180/35 180/35 560/16 560/25 470/35 470/35 330/35 270/50 560/25 330/35 330/35 470/25 180/35 180/35 470/25 560/35 680/35 470/25 330/35 330/35 330/10 330/10 330/10 330/10 270/10 270/10 390/6.3 390/6.3 390/6.3 390/6.3 390/6.3 330/10 220/10 220/10 220/10 220/10 100/10 100/10 330/6.3 330/6.3 330/6.3 330/6.3 330/6.3 220/10
2
3.3
3
2
Quick Design Component Selection Table for Adjustable Output
Output Voltage (V) Through Hole Output Capacitor Panasonic HFQ Series (F/V) 820/35 560/35 470/25 330/25 330/25 220/35 220/35 Nichicon PL Series (F/V) 820/35 470/35 470/25 330/25 330/25 220/35 150/35 Feedforward Capacitor 33nF 10nF 3.3nF 1.5nF 1nF 680pF 560pF Surface Mount Output Capacitor Panasonic HFQ Series (F/V) 330/6.3 330/6.3 220/10 100/16 100/16 68/20 33/25 Nichicon PL Series (F/V) 470/4 390/6.3 330/10 180/16 180/16 120/20 33/25 Feedforward Capacitor 33nF 10nF 3.3nF 1.5nF 1nF 680pF 220pF
2 4 6 9 12 15 24
Diode Selection Table
VR(V) Surface Mount Schottky SK32 3A Diode Through Hole Schottky 1N5820 SR302 MBR320 1N5821 MBR330 31DQ03 1N5822 SR304 MBR340 31DQ04 SR305 MBR350 31DQ05 MUR320 4~6A Diode Surface Mount Through Hole Schottky Schottky 1N5823 SR502 SB520 50WQ03 1N5824 SR503 SB530 50WQ04 1N5825 SR504 SB540 50WQ05 50WF10 SB550 50SQ080 MUR620 HER601
20
30
30WQ03 SK33 SK34 MBRS340 30WQ04 SK35 MBRS360 30WQ05 MURS320 30WF10
40
50
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 10
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator
Package outlines: TO-265
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 11
AT1796
Preliminary Product Information 150kHz, 3A Step-Down Switching Regulator Reflow Profiles
Profile Feature
Sn-Pb Eutectic Assembly Large Body Small Body Pkg. thickness Pkg. thickness <2.5mm or Pkg. 2.5mm or Pkg. 3 volume 350mm3 volume <350mm 3C/second max.
Average ramp-up rate (TL to TP) Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) Tsmax to TL -Ramp-up Rate Time maintained above: -Temperature (TL) -Time (tL) Peak Temperature(TP) Time within 5C of actual Peak Temperature (tP) Ramp-down Rate Time 25C to Peak Temperature
Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness 2.5mm or Pkg. 2.5mm or Pkg. volume 350mm3 volume 350mm3 3C/second max.
100C 150C 60-120 seconds
150C 200C 60-180 seconds 3C/second max.
183C 60-150 seconds 225+0/-5C 10-30 seconds 240+0/-5C 10-30 seconds
217C 60-150 seconds 245+0/-5C 10-30 seconds 250+0/-5C 20-40 seconds
6C/second max. 6 minutes max.
3C/second max. 8 minutes max.
*All temperatures refer to topside of the package, measured on the package body surface.
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 2/15/2006 REV : 1.1 Email: service@aimtron.com.tw 12

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