GS-R24FS0001.8

GS-R12F 2 A DC-DC converter modules Features ■ MTBF 1 000 000 hours (TA = 25 °C) ■ 2 A max output current ■ 16 V max input voltage ■ 1.5 V max drop-out voltage ■ Remote logic inhibit/enable ■ Synchronization ■ Not-latching overload and short circuit protection ■ Thermal shutdown ■ Fixed or adjustable output ■ No heatsink required ■ Operating temperature range -25 °C ÷ 85 °C c u d Description e t le ) s t( o r P o s b O - The GS-R12F series is a family of high efficiency step down switching voltage regulator, designed to replace linear regulators. ) s ( ct Based on ST L5973 device, these non isolated regulators are suitable for various applications, including telecom, industry, computer and distributed power supply system having a wide range input voltage. u d o r P e t e l o bs Table 1. O Device summary Output voltage Input voltage Output ripple Efficiency [V] [V] [mVpp] [%] GS-R12F0182.0 1.8 ± 4 % 4.5 ÷ 15 20 72 Fixed output voltage GS-R12F0252.0 2.5 ± 4 % 4.5 ÷ 15 20 76 Fixed output voltage GS-R12F0332.0 3.3 ± 4 % 4.5 ÷ 15 20 82 Fixed output voltage GS-R12F0502.0 5.0 ± 4 % 6.6 ÷ 15 20 85 Fixed output voltage GS-R12F0002.0 1.235 ÷ 5.5 4.5 ÷ 15 20 68 ÷ 85 Progr. output voltage Order codes February 2008 Rev 2 Notes 1/13 www.st.com 13 Contents GS-R12F Contents 1 2 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 Thermal de-rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 4.1 Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.2 Reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.3 Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.4 Multiple units synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.5 Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.6 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.7 Output voltage programming (GS-R12F0002.0 only) . . . . . . . . . . . . . . . . . 7 4.8 Loop compensation (GS-R12F0002.0 only) . . . . . . . . . . . . . . . . . . . . . . . . 7 4.9 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2/13 ) s ( ct o s b O - u d o r P e t e l o s b O 7 e t le o r P Additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.1 6 c u d ) s t( Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 GS-R12F Pin settings 1 Pin settings 1.1 Pin connection Figure 1. Pin connection and mechanical data (dimensions in mm) c u d 1.2 e t le Pin description Table 2. Pin description Function 1 INH A logic high level disables the device. When the pin is open, an internal pull up disables the device 2 Vref 3.3 V reference voltage 3 Input + DC input voltage Input + DC input voltage ) s ( ct u d o r P e 5 s b O o r P Name 4 t e l o o s b O - ) s t( Description Input GND Return for input voltage source 6 Input GND Return for input voltage source 7 Output GND Return for output voltage source 8 Output GND Return for output voltage source 9 Vout Regulated power output 10 Vout Regulated power output 11 FB Feedback input, available on adjustable device and on request for additional compensation 12 Sync Master/slave synchronization 3/13 Maximum ratings GS-R12F 2 Maximum ratings 2.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol 2.2 Parameter Unit 16 V Vi DC input voltage Iout Maximum output current V1 INH -0.3 to Vi V V12 Sync -0.3 to 4 V V11 FB 4 V internally limited Thermal data Table 4. 2.3 °C -25 ÷ 85 °C Test condition Value Unit Vi = 4.5 ÷ 16 V, TA = 60 °C (Max) 1.95 Vi = 4.5 ÷ 16 V, TA = 65 °C (Max) 1.85 Vi = 4.5 ÷ 16 V, TA = 70 °C (Max) 1.75 Vi = 4.5 ÷ 16 V, TA = 75 °C (Max) 1.65 Vi = 4.5 ÷ 16 V, TA = 80 °C (Max) 1.55 Vi = 4.5 ÷ 16 V, TA = 85 °C (Max) 1.45 P e let o s b O - Thermal de-rating for free air condition (all versions) ) s ( ct Parameter u d o r P e s b O -40 ÷ 105 Operating ambient temperature Symbol t e l o Unit Top Thermal de-rating ) s t( Value Storage temperature range Io ro Parameter Tstg Table 5. c u d Absolute maximum ratings Symbol 4/13 Value Output current A GS-R12F 3 Electrical characteristics Electrical characteristics TA = 25 °C, unless otherwise specified Table 6. Electrical characteristics (all version) Symbol Vr Parameter Test condition Min Typ Max Unit 20 35 mVpp Ripple voltage Vi = 12 V, Io = 2 A Temperature stability Vi = Vo + 1.5 V, Io = 2 A Io Output current Vi = 4.5 ÷ 16 V IoL Current limit Vi = 4.5 ÷ 16 V 2.5 Iq Quiescent current Vi = 12 V, Io = 0 A 1.8 2.5 mA Total stand-by quiescent current Vinh > 2.2 V 50 100 µA Switching frequency Vi = 12 V, Io = 2 A 225 250 275 Reference voltage Vi = 4.5 ÷ 15 V Iref = 0 ÷ 5 mA 3.234 3.3 Iqst-by fs Vref 0 Short circuit current 8 Device ON INH INH threshold voltage e t le Device OFF VFB Feedback voltage SRV Supply voltage rejection ) s ( ct TBD Vi = 4.5 ÷ 15 V IO = 0 ÷ 2 A so Pr mV/°C 2 A uc od 10 ) s t( kHz 3.366 V 30 mA 0.8 V 2.2 1.22 A V 1.235 TBD 1.25 V mV/V b O - u d o r P e t e l o s b O 5/13 Application information GS-R12F 4 Application information 4.1 Input voltage The recommended maximum operating DC Input Voltage is 15 V including ripple voltage. 4.2 Reference voltage No capacitor is required for stability. 4.3 Inhibit function The inhibit feature allows to put the device in stand-by mode. With INH pin 1 is higher than 2.2 V the device is disabled and the current consumption is reduced to less than 100 µA for Vi = 15 V. With INH pin lower than 0.8 V, the device is enabled. c u d ) s t( If the INH pin is left floating, an internal pull up ensures that the voltage at the pin reaches the inhibit threshold and the device is disabled. The pin can be pulled to Vi to disable the device. 4.4 Multiple units synchronization e t le o r P o s b O - Using more than one unit on the same circuit, it is possible to synchronize the switching frequency, connecting all pin 12 together (see Figure 5). The unit with higher frequency becomes the master. ) s ( ct 4.5 Current limitation u d o The device has two current limit protections, pulse by pulse and frequency fold back. r P e The current is sensed through a resistor and if it reaches the threshold, the on time is reduced and consequently the output voltage, too. t e l o s b O Since the minimum switch ON time (necessary to avoid false overcurrent signal) is not enough to obtain a sufficiently low duty cycle at 250 Hz, the output current could increase again, in strong overcurrent or short circuit conditions. For this reason the switching frequency is also reduced to keep the inductor current within its maximum threshold limit. The frequency depends on the feedback voltage. As the feedback voltage decreases (due to the reduced duty cycle), the switching frequency decrease too. 6/13 GS-R12F 4.6 Application information Thermal shutdown The shutdown block generates a signal that turns off the power stage if the temperature of the internal chip goes higher than a fixed internal threshold (150 °C min). The sensing element of the chip is very close to the PDMOS area, so ensuring an accurate and fast temperature detection. An hysteresis of approximately 20 °C avoids that the devices turns on and off continuously. 4.7 Output voltage programming (GS-R12F0002.0 only) The GS-R12F0002.0 output voltage is 5.54 V ± 4 %, to reduce this value connect a resistor between pin 11 (FB) and pin 10 (Vout). The resistor must be located very close to the proper pins, to minimize the injected noise (see Figure 3). The resistor value is calculated using the following formula: Rv = [(Vout - 1.235) * 11.3] / 5.54 - Vout) --[kΩ] c u d Vout can be adjusted between 1.235 V (Rv = 0 Ω) and 5.54 V (Rv = open) 4.8 ) s t( o r P Loop compensation (GS-R12F0002.0 only) e t le If required by particular load conditions, it is possible to change the feedback loop compensation, adding an external capacitor between pin 11 (FB) and pin 10 (Vout), which will act as speed up (see Figure 4). ) s ( ct o s b O - u d o r P e t e l o s b O 7/13 Application information 4.9 GS-R12F Soldering Soldering phase has to be execute with care : in order to avoid undesired melting phenomenon, particular attention has to be take on the set up of the peak temperature. Here following some suggestions for the temperature profile based on IPC/JEDEC J-STD-020C ,July 2004 recommendations. Table 7. Soldering Profile feature PB free assembly Average ramp up rate ( TSMAX to TP) 3 °C / sec max Preheat Temperature min ( TS MIN) Temperature max ( TS MAX) Time (TS MIN to TS MAX) ( tS ) 150 °C 200 °C 60 – 100 sec Time maintained above : Temperature TL Time tL 217 °C 40 – 70 sec Peak temperature (TP) 240 + 0 °C c u d Time within 5 °C of actual peak temperature (tP) Ramp down rate 6 °C / sec e t le Time from 25 °C to peak temperature Figure 2. Soldering ) s ( ct u d o r P e t e l o s b O 8/13 o r P 10 – 20 sec o s b O - 8 minutes max ) s t( GS-R12F Additional features and protections 5 Additional features and protections 5.1 Output overvoltage protection The overvoltage protection, OVP, is realized by using an internal comparator, whose input is connected to the feedback. It turns off the power stage when the OVP threshold is reached. This threshold is typically 30 % higher than the feedback voltage. Figure 3. Figure 5. Output voltage programming Figure 4. Loop compensation c u d Multiple units synchronization e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 9/13 Additional features and protections Figure 6. GS-R12F PCB footprint (dimensions in mm) c u d e t le ) s ( ct u d o r P e t e l o s b O 10/13 o s b O - o r P ) s t( GS-R12F 6 Ordering scheme Ordering scheme Table 8. Ordering information scheme GS- R12 F018 2.0 Input voltage 12 = 12 V Output voltage 018 = 1.8 V 025 = 2.5 V 033 = 3.3 V 050 = 5.0 V c u d 000 = 1.235 ÷ 5.5 V Output current 2.0 = 2 A e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 11/13 Revision history 7 GS-R12F Revision history Table 9. Document revision history Date Revision Changes 16-Oct-2006 1 Initial release 25-Feb-2008 2 Added: Section 4.9: Soldering on page 8 c u d e t le ) s ( ct u d o r P e t e l o s b O 12/13 o s b O - o r P ) s t( GS-R12F Please Read Carefully: Information in this document is provided solely in connection with ST products. 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