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october 2006 rev 1 1/12 12 gs-r24f 2a dc/dc converter modules features mtbf 1 000 000 hours ( t a = 25 c) 2a max output current 35v max input voltage 1.5v 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 -25c 85c description the gs-r24f series is a family of high efficiency step down switching voltage regulator, designed to replace linear regulators. 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. www.st.com order codes part number output voltage [v] input voltage [v] output ripple [mvpp] efficiency [%] notes gs-r24f0182.0 1.8 4% 16 35 25 72 fixed output voltage gs-r24f0252.0 2.5 4 % 16 35 25 76 fixed output voltage gs-r24f0332.0 3.3 4 % 16 35 25 82 fixed output voltage gs-r24f0502.0 5.0 4 % 16 35 25 85 fixed output voltage gs-r24f0002.0 1.235 5.5 16 35 25 68 85 progr. output voltage gs-r24f1201.5 12 4 % 16 35 100 91 fixed output voltage gs-r24f0001.0 3.3 24 16 35 100 250 78 96 progr. output voltage
contents gs-r24f 2/12 contents 1 pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 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 4.1 input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.2 reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.3 inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.4 multiple units synchroni zation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.5 current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.6 thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.7 output voltage programming (gs-r24f0002.0 and gs-r24f0001.0) 7 4.8 loop compensation (gs-r24f0002.0 and gs-r24f0001.0) . . . . . . . . . . 7 5 additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
gs-r24f pin settings 3/12 1 pin settings 1.1 pin connection figure 1. pin connection and mechanical data (dimensions in mm) 1.2 pin description table 1. pin description name function description 1inh a logic high level disables the device. when the pin is open, an internal pull up disables the device 2v ref 3.3v reference voltage 3 input + dc input voltage 4 input + dc input voltage 5 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 9v out regulated power output 10 v out regulated power output 11 fb feedback input, available on adjustable device and on request for additional compensation 12 sync master/slave synchronization
maximum ratings gs-r24f 4/12 2 maximum ratings 2.1 absolute maximum ratings 2.2 thermal data 2.3 thermal de-rating table 2. absolute maximum ratings symbol parameter value unit v i dc input voltage 36 v i out maximum output current internally limit v 1 inh -0.3 to v i v v 12 sync -0.3 to 4 v v 11 fb 4 v table 3. absolute maximum ratings symbol parameter value unit t stg storage temperature range -40 105 c t op operating ambient temperature -25 85 c table 4. thermal de-rating for free air condition (all versions) symbol parameter test condition value unit i o output current v i = 16 35v -------- t a = 60c 1.95 a v i = 16 35v --------- t a = 65c 1.85 v i = 16 35v --------- t a = 70c 1.75 v i = 16 35v --------- t a = 75c 1.65 v i = 16 35v --------- t a = 80c 1.55 v i = 16 35v ------ -- t a = 85c 1.40
gs-r24f electrical characteristics 5/12 3 electrical characteristics t a = 25c, unless otherwise specified table 5. electrical characteristics (all version) symbol parameter test co ndition min typ max unit v r ripple voltage v i =24v i o = 2a for gs-r24fyyy2.0 25 35 mvpp v r ripple voltage v i =24v i o = 1.5a for gs-r24f1201.5 100 mvpp v r ripple voltage v i =24v i o = 1a for gs-r24f0001.0 100 250 mvpp temperature stability v i =v o + 1.5v i o = 2a mv/c i o output current v i =16 35v for gs-r24fyyy2.0 02a i o output current v i =16 35v for gs-r24f1201.5 01.5a i o output current v i =16 35v for gs-r24f0001.0 01a i ol current limit v i =16 35v 2.5 a i q quiescent current v i =24v i o = 0a 1.8 2.5 ma i qst-by total stand-by quiescent current v inh >2.2v v i = 35v 80 150 a f s switching frequency v i = 24v i o = 2a 225 250 275 khz v ref reference voltage v i = 16 35v i ref = 0 5ma 3.234 3.3 3.366 v short circuit current 8 10 30 ma inh inh threshold voltage device on 0.8 v device off 2.2 v v fb feedback voltage v i =16 35v i o =0 2a 1.22 1.235 1.25 v srv supply voltage rejection mv/v r th thermal resistance case to ambient c/w
application information gs-r24f 6/12 4 application information 4.1 input voltage the recommended maximum operating dc input voltage is 35v 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 2.2v the device is disabled and the current consumption is reduced to less than 150a for v i = 35v. with inh pin lower than 0.8v, the device is enabled. 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 v i to disable the device. 4.4 multiple units synchronization using more than one unit on the same circuit, it is possible to synchronize the switching frequency, connecting all pin 12 together (see figure 4 ). the unit with higher frequency becomes the master. 4.5 current limitation the device has two current limit protections, pulse by pulse and frequency fold back. the current is sensed through a resistor and if it reaches the threshold, the on time is reduced and consequently the output voltage, too. since the minimum switch on time (necessary to avoid false overcurrent signal) is not enough to obtain a sufficiently low duty cycle at 250hz, 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.
gs-r24f application information 7/12 4.6 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 clos e 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-r24f0002.0 and gs-r24f0001.0) the gs-r24f0002.0 output voltage is 5.54v 4%, the gs-r24f0001.0 output voltage is 24.44v 4%, to reduce these values connect a resistor between pin 11 (fb) and pin 10 (v out ). the resistor must be located very close to the proper pins, to minimize the injected noise (see figure 2). the resistor value is calculated using the following formula: for gs-r24f0002.0 rv = [(v out - 1.235) * 11.3] / (5.54 - v out ) -- [k ? ]; for gs-r24f0001.0 rv = [(v out - 1.235) * 62] / (24.44 - v out ) -- [k ? ]. v out can be adjusted between 1.235v (rv = 0 ? ) and 5.54v/24.44v (rv = open). 4.8 loop compensation (gs- r24f0002.0 and gs-r24f0001.0) 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 (v out ), which will act as speed up (see figure 3 ).
additional features and protections gs-r24f 8/12 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 4. multiple units synchronization figure 2. output voltage programming figure 3. loop compensation
gs-r24f additional features and protections 9/12 figure 5. p.c.b. footprint (dimensions in mm)
ordering scheme gs-r24f 10/12 6 ordering scheme table 6. ordering information scheme gs- r24 f018 2.0 input voltage 24 = 24v output voltage 018 = 1.8v 025 = 2.5v 033 = 3.3v 050 = 5.0v 120 = 12v 000 = 1.235 5.5v / 3.3 24v output current 2.0 = 2a 1.5 = 1.5a 1.0 = 1a
gs-r24f revision history 11/12 7 revision history table 7. revision history date revision changes 13-oct-2006 1 initial release
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