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| Page No. : 1/1 RS1509 150KHz, 2A PWM Buck DC/DC Converter Description The RS1509 is Monolithic IC that design for a step-down DC/DC Converter, and own the ability of driving a 2A 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. 8-Lead Plastic DIP-8 Package Code: P * 8-Lead Plastic SOP-8 Package Code: S 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: 2A * SOP-8 and DIP-8 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 Applications * Simple High-efficiency step-down regulator * Positive to negative converter * On-card switching regulators Pin Connections 8 7 6 5 Pin1: Operating Voltage Input Pin2: Switch Output Pin3: Output Voltage Feedback Control Pin5: Ground Pin6: Ground Pin7: Ground Pin8: Ground 1 2 3 4 Pin4: ON/OFF Shutdown DS-RS1509-04 Oct, 2007 www.Orister.com Page No. : 2/2 Pin Connections SD VIN Current Source Bias + + 220mV R 1.235V Reference 2.5V Regulator Start Up 200mV + COMP Current Limit FB R2 + AMP + COMP COMP + 150KHz OSC. COMP + 3A Switch Driver Thermal Limit R1=2.5K Output GND Absolute Maxium Rating (Note1) Parameter Supply Voltage On/Off Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Operating Temperature Storage Temperature Operating Junction Temperature Range Operating Voltage Symbol VCC VSD VFB VOUT PD Topr Tstg TJ VOP Value 40 -0.3~+25 -0.3~+25 -1 Internally Limited 0~+70 -65~+150 -40~+125 +4.5~+40 Unit V V V V W o o o C C C V Electrical Characteristics (Continued) Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25 C o (Note 2) Part No. Parameter Output Voltage Efficiency Symbol VOUT VOUT VOUT VFB Conditions 4.75VVIN40V, 0.2AILOAD2A VIN=12V, ILOAD=2A 7VVIN40V, 0.2AILOAD2A VIN=12V, ILOAD=2A 15VVIN40V, 0.2AILOAD2A VIN=25V, ILOAD=2A 4.5VVIN40V, 0.2AILOAD2A VOUT programmed for 3V VIN=12V, VOUT=3V, ILOAD=2A Min. 3.168 3.135 4.800 4.750 11.52 11.40 1.193 - Typ. Max. (Note3) (Note4) 3.3 73 5.0 80 12.0 90 1.23 77 3.342 3.465 5.200 5.250 12.48 12.60 1.267 1.280 - Unit V % V % V % V % RS1509-3.3 RS1509-5.0 Output Voltage Efficiency RS1509-12 Output Voltage Efficiency RS1509-ADJ Reference Voltage Efficiency DS-RS1509-04 Oct, 2007 www.Orister.com Page No. : 3/3 All Output Voltage Versions Electrical Characteristics 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=18V for the 12V version, ILOAD=500mA) o Parameter Device Parameters Feedback Bias Current Oscillator Frequency Saturation Voltage Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current Symbol Test Condition Min. Typ. Max. -50 -100 173 173 1.4 1.5 -50 10 250 300 0.6 -15 -5 Unit Ib fO VSAT DC ICL IL IQ ISTBY JC Adjustable Version Only, VFB=1.3V (Note 5) 120 110 2.1 2.0 - -10 150 1.3 100 0 2.5 5 150 14 15 80 70 nA KHz V % A uA mA uA o IOUT=2A (Note 6,7) (Note 7) (Note 8) Peak Current (Note 6,7) Output=0V (Note 8) (Note 6,8) ON/OFF pin=5V (Note 9) DIP-8 SOP-8 DIP-8 SOP-8 Junction to Case Junction to ambient C/W C/W Thermal Resistance JA ON/OFF Control ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Input Current VIH VIL IIH IIL (Note 10) o Low (Regulator ON) High (Regulator OFF) VLOGIC=2.5V (Regulator OFF) VLOGIC=0.5V (Regulator ON) 1.3 -5 -0.02 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. 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. Note 10: Junction to ambient thermal resistance. (With copper area of approximately 3in ) 2 o DS-RS1509-04 Oct, 2007 www.Orister.com Page No. : 4/4 Characteristics Curve Normalized Output Voltage 1.5 VIN=12V ILOAD=200mA 160 140 120 Shutdown Quiescent Current 1 Output Voltage Change (%). . Current (uA) 0.5 100 80 60 40 VON/VOFF=5V TJ=25 C o 0 -0.5 -1 20 -1.5 0 25 50 75 100 o 125 150 175 0 0 10 20 30 Supply Voltage (V) 40 Junction Temperature ( C) Switch Current Limit 6.00 5.90 1.30 VIN=12V TJ=25oC 1.20 Switch Saturation Voltage Switch Current Limit (A) 5.70 5.60 5.50 5.40 5.30 5.20 0 25 50 75 100 o Saturation Voltage (V) 5.80 1.10 VIN=12V VOUT =5V 1.00 0.90 0.80 125 150 0 1 2 3 4 Junction Temperature ( C) Switch Current (A) On/Off Pin Current (Sinking) 12 10 Vin=22V 8 Current (uA) 6 4 2 0 0 5 10 15 20 25 30 Tj=25 On/Off Pin Voltage (V) DS-RS1509-04 Oct, 2007 www.Orister.com Page No. : 5/5 Typical Application Circuit Fig.1 Fixed Type Circuit 3 FB + 1 Vin DC C1 680uF 4 RS1509 Fix Output 5 6 7 8 2 Output L1 33uH D1 1N5825 C2 220uF L O A D SD Gnd Gnd Gnd Gnd Fig.2 Adjustable Output Voltage Versions R2 1K + 1 Vin DC C1 680uF 3 FB R1 RS1509 Adjustable Output 4 5 6 7 8 2 Output L1 47uH D1 1N5825 C2 220uF L O A D SD Gnd Gnd Gnd Gnd DS-RS1509-04 Oct, 2007 www.Orister.com Page No. : 6/6 DIP-8 Dimension DIM A B C D E F G H I J K L M 1 Min. 6.29 9.22 3.25 3.17 0.38 2.28 7.49 8.56 0.229 o 94 Max. 6.40 9.32 *1.52 *1.27 *0.99 3.35 3.55 0.53 2.79 7.74 *3.00 8.81 0.381 o 97 8 7 6 5 A 1 2 3 4 B F J C E D G H 1 K M L *: Typical, Unit: mm 8-Lead DIP-8 Plastic Package Package Code: P I SOP-8 Dimension DIM A B C D E F G H I J K L M N O Min. 4.85 3.85 5.80 1.22 0.37 3.74 1.45 4.80 0.05 0.30 0.19 0.37 0.23 0.08 0.00 Max. 5.10 3.95 6.20 1.32 0.47 3.88 1.65 5.10 0.20 0.70 0.25 0.52 0.28 0.13 0.15 A G 8 B 7 6 5 C 4 J H I Pin1 Index 2 3 D E Part A K L N O Part A M *: Typical, Unit: mm 8-Lead SO-8 Plastic Surface Mounted Package Package Code: S F Ordering Information Part Number RS1509S-ADJ RS1509S -3.3 RS1509S -5.0 RS1509S -12 Package SOP-8 SOP-8 SOP-8 SOP-8 Part Number RS1509P-ADJ RS1509P -3.3 RS1509P -5.0 RS1509P -12 Package DIP-8 DIP-8 DIP-8 DIP-8 DS-RS1509-04 Oct, 2007 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 TP Ramp-up TL Tsmax Temperature tL Critical Zone TL to TP Tsmin tS Preheat Ramp-down 25 t 25oC to Peak Time Profile Feature 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 5oC of actual Peak Temperature (tP) Ramp-down Rate Time 25oC to Peak Temperature 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices. Sn-Pb Eutectic Assembly <3 C/sec 100oC 150oC 60~120 sec <3oC/sec o 183 C o Pb-Free Assembly <3oC/sec 150oC 200oC 60~180 sec <3oC/sec 217oC 60~150 sec 260oC +0/-5oC 20~40 sec <6oC/sec <8 minutes 60~150 sec 240 C +0/-5 C 10~30 sec <6oC/sec <6 minutes o o Peak temperature 245 C 5 C 260oC +0/-5oC o o Dipping time 5sec 1sec 5sec 1sec DS-RS1509-04 Oct, 2007 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-RS1509-04 Oct, 2007 www.Orister.com |
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