AT1796-33

AT1796 AIMTRON | Alldatasheet

Document overview

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Technical content

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

Applications

High-efficiency step-down regulator TFT Scalar Board On-card switching regulators

Description

The AT1796 ser ies of r egulators ar e step- down (buck) DC /DC converter, capable o f dri ving a 3A load with excellent line and load regulation. Requiring a minimum num ber of ex ternal components, these regulators are simple to use . The A T1796 ser ies operates at a sw itching frequency o f 150kHz.Available i n a st andard 5-lead TO-263 surface mount package. It include a guara nteed ±4% to lerance on ou tput voltage under speci fied i nput voltage and o utput load conditions, an d ±15% on th e oscillator frequency. Block Diagram Aimtron reserves the right without notice to change this circuitry and specifications.

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Pin Configuration

Ordering Information

Part number Package Marking AT1796-50 TO-265(5.0V version) AT1796-50A AT1796-50_PBF TO-265(5.0V version),PB-Free AT1796-50A,date code with one bottom line AT1796-33 TO-265(3.3V version) AT1796-33A AT1796-33_PBF TO-265(3.3V version),PB-Free AT1796-33A,date code with one bottom line AT1796-ADJ TO-265(ADJ version) AT1796-ADJ AT1796-ADJ_PBF TO-265(ADJ version),PB-Free AT1796-ADJ,date code with one bottom line *For more marking information, contact our sales representative directly Pin Description Symbol Pin No. Descript VCC 1 Power Supply OUT 2 Switch Node Connection to Inductor GND 3 Power ground FB 4 Output Feedback SHDN 5 ON/OFF Control

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Absolute maximum ratings Parameter Symbol Limits unit Power supply voltage VCC 30 V SHDN pin input voltage VSHDN -0.3~+25 V Power dissipation Pd Internally Limited W Operating Junction Temperature TJ -30~+125 oC Storage temperature Tstg -65~+150 oC Thermal Resistance from Junction to Ambient θJA 19.4 oC/W Thermal Resistance from Junction to Case θJC 7.7 oC/W Lead Temperagture(Soldering, 5sec.) 260 oC HBM 2 KV ESD Susceptibility *2 MM 200 V 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to th e device. Th ese are s tress rat ings on ly, an d fu nctional 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 ar e ESD sensitive . Handling p recaution recommended. The Human Body model is a 100pF capacitor discharged through a 1.5KΩ resistor into each pin. 3. θJA is measured with the component mounted on an evaluation PC board in free air that the required area of copper is 2.5in2 (1 oz.)or larger. Recommended operating conditions (TA = 25oC) Parameter Symbol Limits unit Power supply voltage VCC 4.5~28 V SHDN pin input voltage VSHDN 0~+20 V

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw

Electrical characteristics

(VCC = 12V , Ta =+25Ċ , unless otherwise noted. ) Values Parameter Symbol Condition Min. Typ. Max. Unit Quiescent Current IOC -- 5 10 mA Stand-by quiescent Current ISQC SHDN = 5V -- 80 200 µA VIL Active mode -- -- 0.6 V SHDN pi n l ogic i nput voltage threshold VIH Standby mode 2.0 -- -- V IIL Active mode -- 0.02 5 µASHDN pi n l ogic i nput current IIH Standby mode -- 5 15 µA <AT1796-3.3V> Output voltage VOUT 4.75ÙVccÙ28V 0.2AÙILOADÙ3A 3.168 3.3 3.432 V Efficiency η Vin = 12V , ILOAD = 3A 73 -- -- % <AT1796-5.0V> Output voltage VOUT 4.75ÙVccÙ28V 0.2AÙILOADÙ3A 4.8 5.0 5.2 V Efficiency η Vin = 12V , ILOAD = 3A -- 80 -- % <AT1796-ADJ> FB voltage VFB 4.75ÙVccÙ28V 0.2AÙILOADÙ3A 1.193 1.230 1.267 V Efficiency η Vin = 12V , ILOAD = 3A , VOUT = 3V -- 73 -- % <Device parameters> Saturation voltage VSAT ILOAD = 3A -- 1.15 1.5 V Oscillator frequency FOSC 127 150 173 kHz Maximum duty cycle DMAX FB = 0V -- 100 -- % Minimum duty cycle DMIN FB = 3.3V or 5V -- 0 -- % Current limit ICL Peak current 3.6 4.5 5.0 A IL1 No diode . capacitor , inductor FB = 12V , Switching OFF , OUT = 0V -- 50 -- µA Output leakage current IL2 Vcc =28V -- 2 30 mA

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw CH1:SHDN CH2:5V Output CH3:OUT CH4:I IN Fig1. 5V/2A Output Fig2. 5V/3A Output

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Typical Performance Characteristics: Continuous mode switching waveforms VIN=20VdVOUT=5VdILOAD=2AdL=33µH COUT=220µFdCOUT ESR=50mΩ Load transient response for continuous mode VIN=20VdVOUT=5VdILOAD=500mA to 2A L=33µHdCOUT=220µFdCOUT ESR=50mΩ Discontinuous mode switching waveforms VIN=20VdVOUT=5VdILOAD=90mAdL=33µH COUT=220µFdCOUT ESR=50mΩ

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Adjustable Output Application Example : 21( R RVV FBOUT += VVFB 23.1=

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Application Circuit:

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Application Data : Quick Design Component Selection Table Output Capacitor(µF/V) Input/Output Condition Inductor Through Hole electrolytic Surface Mount Tantalum Output Voltage (V) Load Current (A) Max. Input Voltage (V) Inductance (µH) Current (A) Nichicon PL Series Panasonic HFQ Series Sprague 595D Series AVX TPS Series 8 22 3.5 560/25 560/25 330/10 220/10 15 33 3.5 330/35 330/35 330/10 220/10 25 47 3.5 270/35 330/35 330/10 220/10 9 22 3.1 560/16 470/25 330/10 220/10 15 68 3.1 180/35 180/35 270/10 100/10 25 68 3.1 180/35 180/35 270/10 100/10 5 22 3.5 560/16 470/25 390/6.3 330/6.3 12 22 3.5 560/25 560/35 390/6.3 330/6.3 25 33 3.5 470/35 680/35 390/6.3 330/6.3 6 22 3.1 470/35 470/25 390/6.3 330/6.3 12 33 3.1 330/35 330/35 390/6.3 330/6.3 3.3 25 47 3.1 270/50 330/35 330/10 220/10 Quick Design Component Selection Table for Adjustable Output Through Hole Output Capacitor Surface Mount Output Capacitor Output Voltage (V) Panasonic HFQ Series (µF/V) Nichicon PL Series (µF/V) Feedforward Capacitor Panasonic HFQ Series (µF/V) Nichicon PL Series (µF/V) Feedforward Capacitor 2 820/35 820/35 33nF 330/6.3 470/4 33nF 4 560/35 470/35 10nF 330/6.3 390/6.3 10nF 6 470/25 470/25 3.3nF 220/10 330/10 3.3nF 9 330/25 330/25 1.5nF 100/16 180/16 1.5nF 12 330/25 330/25 1nF 100/16 180/16 1nF 15 220/35 220/35 680pF 68/20 120/20 680pF 24 220/35 150/35 560pF 33/25 33/25 220pF Diode Selection Table 3A Diode 4~6A Diode Surface Mount Through Hole Surface Mount Through Hole VR(V) Schottky Schottky Schottky Schottky

20 SK32 1N5820

40 SK34

50 SK35

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Package outlines: TO-265

Preliminary Product Information 1 50kHz, 3 A S tep-Down S witching R egulator 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 R EV : 1.1 E mail: service@aimtron.com.tw Reflow Profiles Sn-Pb Eutectic Assembly Pb-Free Assembly Profile Feature Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness <2.5mm or Pkg. volume <350mm3 Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Average ramp-up rate (TL to TP) 3°C/second max. 3°C/second max. Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds Tsmax to TL -Ram p-up Rate 3°C/second max. Time maintained above: -Temperature (TL) -T ime (tL) 183°C 60-150 seconds 217°C 60-150 seconds Peak Temperature(TP) 225+0/-5°C 240+0/-5°C 245+0/-5°C 250+0/-5°C Time within 5°C of a ctual Peak Temperature (tP) 10-30 seconds 10-30 seconds 10-30 seconds 20-40 seconds Ramp-down Rate 6°C/second max. 3°C/second max. Time 2 5°C to Peak Temperature 6 minutes max. 8 minutes max. *All temperatures refer to topside of the package, measured on the package body surface.