Page No. : 1/1 RS2596 RS2596 Series The RS2596 is Monolithic IC that design for a step-down DC/DC Converter, and own the ability of driving a 3A load without additional transistor component. The output version included 3.3V, 5V, 12V and an adjustable type. It operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. Features • 3.3V, 5V, 12V and adjustable • Adjustable version output voltage range: 1.4-37V • ±4% max over line and load conditions • 150KHz ±15% fixed switching frequency • TTL shutdown capability • Operating voltage can be up to 40V • Output load current: 3A • TO220-5L and TO263-5L packages • Low power standby mode • Thermal-shuntdown and current-limit protection • High efficiency • Built-in switching a transistor on chip, requires only 4 external components 1 2 3 4 5 TO263-5L Package Description TO220-5L Package 150KHz, 3A PWM Buck DC/DC Converter 1 2 3 4 5 Applications • Simple High-efficiency step-down regulator • Positive to negative converter • On-card switching regulators Connection Diagrams TO220-5L TO263-5L Pins 1,3,5 Pins 2,4 Side View 5 - On/Off 4 - Feed Back 3 - Ground 2 - Output 1 - VIN Top View Metal Tab GND DS-RS2596-04 Oct, 2007 Side View 5 - On/Off 4 - Feed Back 3 - Ground 2 - Output 1 - VIN Top View Metal Tab GND www.Orister.com Page No. : 2/2 Pin Connections SD VIN + Current Source Bias 1.235V Reference 2.5V Regulator Start Up 200mV + 220mV R + COMP Current Limit FB R2 + AMP COMP + R1=2.5K + COMP - COMP + 3A Switch Driver 150KHz OSC. Output Thermal Limit GND Absolute Maxium Rating (Note1) Symbol Value Unit Supply Voltage Parameter VCC 40 V On/Off Pin Input Voltage VSD -0.3~+25 V Feedback Pin Voltage VFB -0.3~+25 V Output Voltage to Ground VOUT -1 V Power Dissipation PD Internally Limited W Operating Temperature Topr 0~+70 o C -65~+150 o C TJ -40~+125 o C VOP +4.5~+40 Storage Temperature Tstg Operating Junction Temperature Range Operating Voltage V Electrical Characteristics (Continued) o (Note 2) Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25 C Part No. RS2596-3.3 Parameter Output Voltage Efficiency RS2596-5.0 Output Voltage Efficiency RS2596-12 Output Voltage Efficiency RS2596-ADJ Reference Voltage Efficiency DS-RS2596-04 Oct, 2007 Symbol VOUT η VOUT η VOUT η VFB η Conditions 4.75V≤VIN≤40V, 0.2A≤ILOAD≤3A VIN=12V, ILOAD=3A 7V≤VIN≤40V, 0.2A≤ILOAD≤3A VIN=12V, ILOAD=3A 15V≤VIN≤40V, 0.2A≤ILOAD≤3A VIN=25V, ILOAD=3A 8V≤VIN≤40V, 0.2A≤ILOAD≤3A VOUT programmed for 5V VIN=12V, VOUT=5V, ILOAD=3A Min. Typ. Max. (Note3) (Note4) Unit 3.168 3.135 3.3 3.342 3.465 V - 73 - % 4.800 4.750 5.0 5.200 5.250 V - 80 - % 11.52 11.40 12.0 12.48 12.60 V - 90 - % 1.193 1.230 - 77 1.267 1.280 - V % www.Orister.com Page No. : 3/3 All Output Voltage Versions Electrical Characteristics o Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25 C (Unless otherwise specified, VIN=12V for the 3.3V, 5V, and adjustable version and VIN=24V for the 12V version, ILOAD=500mA) Parameter Symbol Test Condition Min. Typ. Max. Unit - 10 50 100 nA 127 110 150 173 173 KHz - 1.3 1.4 1.5 V - 100 0 - % 3.6 4.5 5.5 6.5 A Device Parameters Feedback Bias Current Ib Adjustable Version Only, VFB=1.3V Oscillator Frequency fO (Note 5) IOUT=3A (Note 6,7) Saturation Voltage VSAT Max. Duty Cycle (ON) Min. Duty Cycle (OFF) DC (Note 8) Current Limit ICL Peak Current (Note 6,7) (Note 7) (Note 6,8) Output Leakage Current IL Output=0V - - 50 uA Quiescent Current IQ (Note 8) - 5 10 mA ON/OFF pin=5V (Note 9) - 150 250 300 uA TO220-5L - 2.5 - - 3.5 - - 28 - - 23 - Standby Quiescent Current ISTBY θJC Thermal Resistance θJA (Note 10) TO263-5L TO220-5L TO263-5L Junction to Case Junction to ambient o C/W o C/W ON/OFF Control ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Input Current VIH Low (Regulator ON) - VIL High (Regulator OFF) IIH VLOGIC=2.5V (Regulator OFF) - 5 15 IIL VLOGIC=0.5V (Regulator ON) - 0.02 5 2.0 0.6 1.3 - V uA Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. o Note 3: Typical numbers are at 25 C and represent the most likely norm. Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 5: The switching frequency is reduced when the second stage current limit is activated. Note 6: No diode, inductor or capacitor connected to output pin. Note 7: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 8: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF. Note 9: VIN=40V. 2 Note 10: Junction to ambient thermal resistance. (With copper area of approximately 3in ) DS-RS2596-04 Oct, 2007 www.Orister.com Page No. : 4/4 Characteristics Curve Normalized Output Voltage Shutdown Quiescent Current 160 1.5 VIN=12V 140 ILOAD=200mA 120 0.5 Current (uA) Output Voltage Change (%).. 1 0 100 VON/VOFF=5V 80 o TJ=25 C 60 -0.5 40 -1 20 -1.5 0 25 50 75 100 125 150 0 175 0 o 10 20 30 Supply Voltage (V) Junction Temperature ( C) 40 Switch Saturation Voltage Switch Current Limit 1.30 6.00 VIN=12V TJ=25oC 1.20 5.80 Saturation Voltage (V) Switch Current Limit (A) 5.90 5.70 5.60 VIN=12V 5.50 VOUT =5V 5.40 1.10 1.00 0.90 5.30 0.80 5.20 0 25 50 75 100 o 125 150 0 1 2 3 4 Switch Current (A) Junction Temperature ( C) On/Off Pin Current (Sinking) 12 Current (uA) 10 VIN=40V 8 o TJ=25 C 6 4 2 0 0 5 10 15 20 25 30 On/Off Pin Voltage (V) DS-RS2596-04 Oct, 2007 www.Orister.com Page No. : 5/5 Typical Application Circuit Fig.1 Fixed Type Circuit Fig.2 Adjustable Output Voltage Versions DS-RS2596-04 Oct, 2007 www.Orister.com Page No. : 6/6 TO-263-5L Dimension A B E F K L G H C 1 2 3 5 4 I J D DIM A B C D E F G H I J K L a1 Min. 9.9 15.20 4.50 8.20 0.05 5.10 2.44 O 0 Max. 10.30 #7.10 15.60 *1.70 4.70 *1.27 8.60 0.25 5.50 2.64 #7.00 #4.48 O 7 #: REF, *: Typical, Unit: mm a1 5-Lead TO-263 Plastic Package Package Code: U TO-220-5L Dimension J A K r1 B C D E a1 M L S r2 a1 a1 N F O r3 r3 r3 G I H Q P R 5-Lead TO-220 Plastic Package Package Code: E DIM A B C D E F G H I J K L M N O P Q R S r1 r2 r3 a1 Min. 10.10 2.55 3.20 7.90 12.50 22.30 3.20 0.70 6.60 4.40 1.17 17.00 16.00 17.00 2.30 3.30 0.28 7.62 22.90 1.85 1.20 2.80 o 4.5 Max. 10.50 2.95 3.60 8.30 12.90 22.70 3.60 0.90 7.00 4.80 1.37 18.00 16.40 19.00 2.70 4.10 0.48 8.02 23.30 1.95 1.30 3.20 o 5.5 *: Typical, Unit: mm Ordering Information PART NUMBER RS2596U-ADJ RS2596U-3.3 RS2596U-5.0 RS2596U-12 DS-RS2596-04 Oct, 2007 PIN-PACKAGE TO-263-5L TO-263-5L TO-263-5L TO-263-5L PART NUMBER RS2596E-ADJ RS2596E-3.3 RS2596E-5.0 RS2596E-12 PIN-PACKAGE TO-220-5L TO-220-5L TO-220-5L TO-220-5L www.Orister.com Page No. : 7/7 Soldering Methods for Orister’s Products 1. Storage environment: Temperature=10oC~35oC Humidity=65%±15% 2. Reflow soldering of surface-mount devices Figure 1: Temperature profile tP Critical Zone TL to TP TP Ramp-up TL tL Temperature Tsmax Tsmin tS Preheat 25 Ramp-down t 25oC to Peak Time Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly <3 C/sec <3oC/sec - Temperature Min (Tsmin) 100oC 150oC - Temperature Max (Tsmax) 150oC 200oC 60~120 sec 60~180 sec <3oC/sec <3oC/sec o 183 C 217oC Average ramp-up rate (TL to TP) o Preheat - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate Time maintained above: - Temperature (TL) - Time (tL) 60~150 sec Peak Temperature (TP) Time within 5oC of actual Peak Temperature (tP) Ramp-down Rate Time 25oC to Peak Temperature o o 60~150 sec 240 C +0/-5 C 260oC +0/-5oC 10~30 sec 20~40 sec <6oC/sec <6oC/sec <6 minutes <8 minutes Peak temperature Dipping time 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices. DS-RS2596-04 Oct, 2007 o o 245 C ±5 C 5sec ±1sec 260oC +0/-5oC 5sec ±1sec www.Orister.com Page No. : 8/8 Important Notice: • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of Orister Corporation. • Orister Corporation reserves the right to make changes to its products without notice. • Orister Corporation products are not warranted to be suitable for use in Life-Support Applications, or systems. • Orister Corporation assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. DS-RS2596-04 Oct, 2007 www.Orister.com