LESHAN RADIO COMPANY, LTD. LR2596 LR2596 Series Description 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 TO263-5L Package The LR2596 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. 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 Side View 5 - On/Off 4 - Feed Back 3 - Ground 2 - Output 1 - VIN Top View Metal Tab GND 1/7 LESHAN RADIO COMPANY, LTD. LR2596 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) Parameter Symbol Value Unit Supply Voltage 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 PD Internally Limited Power Dissipation Operating Temperature Topr W -40~+125 o o Storage Temperature Tstg -65~+150 Operating Voltage VOP +4.5~+40 C C 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. LR2596-3.3 Parameter Output Voltage Efficiency LR2596-5.0 Output Voltage Efficiency LR2596-12 Output Voltage Efficiency LR2596-ADJ Output Voltage Efficiency Symbol VOUT η VOUT η VOUT η VOUT 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 4.5V≤VIN≤40V, 0.2A≤ILOAD≤3A VOUT programmed for 3V VIN=12V, VOUT=3V, 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 - % 1.261 1.248 1.300 1.339 1.352 V - 73 - % 2/7 LESHAN RADIO COMPANY, LTD. All Output Voltage Versions Electrical Characteristics LR2596 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) Saturation Voltage VSAT IOUT=3A (Note 6,7) (Note 7) Max. Duty Cycle (ON) Min. Duty Cycle (OFF) DC (Note 8) Current Limit ICL Peak Current (Note 6,7) Output Leakage Current IL Output=0V (Note 6,8) - - 50 uA IQ (Note 8) - 5 10 mA ON/OFF pin=5V (Note 9) - 150 250 300 uA TO220-5L Junction to Case - 2.5 - - 3.5 - Junction to ambient - 28 - - 23 - Quiescent Current Standby Quiescent Current ISTBY θJC Thermal Resistance θJA(Note 10) TO263-5L TO220-5L TO263-5L 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 1.3 2.0 0.6 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 ) 3/7 LESHAN RADIO COMPANY, LTD. LR2596 Characteristics Curve Normalized Output Voltage Shutdown Quiescent Current 160 1.5 VIN=12V 140 ILOAD=200mA 120 Current (uA) Output Voltage Change (%).. 1 0.5 0 100 VON/VOFF=5V 80 o TJ=25 C 60 -0.5 40 -1 20 -1.5 0 0 25 50 75 100 125 150 175 0 o 10 20 30 Supply Voltage (V) Junction Temperature ( C) Switch Current Limit 40 Switch Saturation Voltage 6.00 1.30 VIN=12V TJ=25o C 1.20 5.80 Saturation Voltage (V) Switch Current Limit (A) 5.90 5.70 5.60 VIN=12V 5.50 VOUT =5V 1.10 1.00 5.40 0.90 5.30 0.80 5.20 0 25 50 75 100 125 150 o 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) 4/7 LESHAN RADIO COMPANY, LTD. LR2596 Typical Application Circuit Fig.1 Fixed Type Circuit 4 + Unregulated DC Input 1 Input C1 680uF Feedback 2 Output D2596 LR2596 Fix Output 3 GND 5 ON/OFF L1 33uH D1 1N5825 C2 220uF L O A D C2 220uF L O A D Fig.2 Adjustable Output Voltage Versions R1 R2 1K + Unregulated DC Input 1 Input C1 680uF 4 LR2596 D2596 Adjustable Output 3 5 2 Output L1 47uH D1 1N5825 5/7 LESHAN RADIO COMPANY, LTD. LR2596 TO-263-5L Dimension Marking: A E F B Pb Free Mark K . " Pb-Free: " D U Product Series ADJ,3.3,5.0, 2596 Normal: None Date Code Control Code L G Note: Green label is used for pb-free packing H C 1 2 3 4 Pin Style: 1.Vin 2.Output 3.Ground 4.Feed Back 5.On/Off 5 Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 I J D a1 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 5-Lead TO-263 Plastic Package DBMI Package Code: U TO-220-5L Dimension Marking: Pb Free Mark J A K r1 B Pb-Free: " . " Normal: Product Series D E 2596 - Date Code C Control Code Note: Green label is used for pb-free packing D E a1 M L S ADJ,3.3,5.0,12 r2 a1 a1 N F O r3 r3 Pin Style: 1.Vin 2.Output 3.Ground 4.Feed Back 5.On/Off Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 r3 G I H Q P R 5-Lead TO-220 Plastic Package DBMI 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 6/7 LESHAN RADIO COMPANY, LTD. LR2596 Soldering Methods for DBMI’s Products o o 1. Storage environment: Temperature=10 C~35 C 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 Ramp-down 25 t 25oC to Peak Time Profile Feature Average ramp-up rate (TL to TP) Sn-Pb Eutectic Assembly o Pb-Free Assembly o <3 C/sec <3 C/sec - Temperature Min (Tsmin) 100oC 150oC - Temperature Max (Tsmax) o 150 C o 200 C 60~120 sec 60~180 sec Preheat - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate o o <3 C/sec <3 C/sec Time maintained above: - Temperature (TL) - Time (tL) o o 183 C 217 C 60~150 sec Peak Temperature (TP) o o 60~150 sec o o 240 C +0/-5 C 260 C +0/-5 C 10~30 sec 20~40 sec Ramp-down Rate <6oC/sec <6oC/sec o <6 minutes <8 minutes Peak temperature Dipping time 245 C ±5 C 5sec ±1sec Time within 5oC of actual Peak Temperature (tP) Time 25 C to Peak Temperature 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices. o o o o 260 C +0/-5 C 5sec ±1sec 7/7