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february 2008 rev 2 1/15 15 gs-r24fp 1.8 a dc-dc converter modules features mtbf 1 000 000 hours ( t a = 25 c) 1.8 a max output current 35 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 description the gs-r24fp series is a family of high efficiency step down switching voltage regulator, designed to replace linear regulators. based on st l5973a device, this non isolated family of regulators are suitable for the full spectrum of applicatio ns including telecom, industry, computer and distributed power system applications having a widely ranging input voltage. packing type: v = vertical pth packing type: s = horizontal smd www.st.com table 1. device summary order codes output voltage [v] input voltage [v] output ripple [mvpp] efficiency [%] notes gs-r24fp0181.8 1.8 4% 16 35 25 59 - 63 fixed output voltage gs-r24fp0251.8 2.5 4 % 16 35 30 66 - 70 fixed output voltage gs-r24fp0331.8 3.3 4 % 16 35 30 70 - 75 fixed output voltage gs-r24fp0501.8 5.0 4 % 16 35 40 79 - 83 fixed output voltage gs-r24fp0001.8 1.235 5.5 % 16 35 40 56 - 83 progr. output voltage obsolete product(s) - obsolete product(s)
contents gs-r24fp 2/15 contents 1 pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 pin connection and mechanical data (dimensions in mm) . . . . . . . . . . . . . 3 1.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 thermal de-rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.1 input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.2 reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.3 inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.4 multiple units synchroni zation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.5 current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.6 thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.7 output voltage programming (gs-r24fp0001.8 only) . . . . . . . . . . . . . . . 9 4.8 loop compensation (gs-r24fp0001.8 only) . . . . . . . . . . . . . . . . . . . . . . 9 4.9 soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1 output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 obsolete product(s) - obsolete product(s)
gs-r24fp pin settings 3/15 1 pin settings 1.1 pin connection and mechan ical data (dimensions in mm) figure 1. pin connection gs-r24fvxxx1.8 figure 2. pin connection gs-r24fsxxx1.8 obsolete product(s) - obsolete product(s)
pin settings gs-r24fp 4/15 1.2 pin description table 2. 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 2 sync master/slave synchronization 3v ref 3.3 v reference voltage 4 input + dc input voltage 5 input + dc input voltage 6 input/output gnd return for input/output voltage source 7 input/output gnd return for input/output voltage source 8v out regulated power output 9v out regulated power output 10 fb feedback input, available on adjustable device and on request for additional compensation obsolete product(s) - obsolete product(s)
gs-r24fp maximum ratings 5/15 2 maximum ratings 2.1 absolute maximum ratings 2.2 thermal data table 3. absolute maximum ratings symbol parameter value unit v i dc input voltage 36 v i out maximum output current int. limit v 1 inh -0.3 to v i v v 2 sync -0.3 to 4 v v 10 fb 4 v table 4. thermal data symbol parameter value unit t stg storage temperature range -40 105 c t op operating ambient temperature -25 85 c obsolete product(s) - obsolete product(s)
maximum ratings gs-r24fp 6/15 2.3 thermal de-rating table 5. thermal de-rating for free air condition (all versions) symbol parameter test condition value unit i o output current v i = 16 v, t a = 30 c 1.80 a v i = 16 v, t a = 40 c 1.80 v i = 16 v, t a = 50 c 1.75 v i = 16 v, t a = 55 c 1.70 v i = 16 v, t a = 60 c 1.65 v i = 16 v, t a = 65 c 1.50 v i = 16 v, t a = 70 c 1.35 v i = 16 v, t a = 75 c 1.25 v i = 16 v, t a = 80 c 1.10 v i = 16 v, t a = 85 c 0.90 i o output c urrent v i = 24 v, t a = 30 c 1.80 a v i = 24 v, t a = 40 c 1.75 v i = 24 v, t a = 50 c 1.70 v i = 24 v, t a = 55 c 1.60 v i = 24 v, t a = 60 c 1.45 v i = 24 v, t a = 65 c 1.30 v i = 24 v, t a = 70 c 1.20 v i = 24 v, t a = 75 c 1.05 v i = 24 v, t a = 80 c 0.85 v i = 24 v, t a = 85 c 0.60 i o output current v i = 35 v, t a = 30 c 1.75 a v i = 35 v, t a = 40 c 1.60 v i = 35 v, t a = 50 c 1.45 v i = 35 v, t a = 55 c 1.35 v i = 35 v, t a = 60 c 1.20 v i = 35 v, t a = 65 c 1.05 v i = 35 v , t a = 70 c 0.90 v i = 35 v, t a = 75 c 0.75 v i = 35 v, t a = 80 c 0.50 v i = 35 v, t a = 85 c 0.30 obsolete product(s) - obsolete product(s)
gs-r24fp electrical characteristics 7/15 3 electrical characteristics t a = 25 c, unless otherwise specified table 6. electrical characteristics (all version) symbol parameter test condition min typ max unit v r ripple voltage v i =24 v i o = 1.8 a for gs-r24fpyyy1.8 30 60 mvpp temperature stability v i =v o + 1.5 v i o = 1.8 a mv/c i o output current v i =16 35 v for gs-r24fpyyy1.8 01.8a i ol current limit v i =16 35 v 2.3 a i q quiescent current v i =24 v i o = 0 a 2.7 ma i qst-by total stand-by quiescent current v inh > 2.2 v v i = 35 v 80 150 a f s switching frequency v i = 24 v i o = 1.8 a 500 khz v ref reference voltage v i = 16 35 v i ref = 0 5 ma 3.2 3.3 3.399 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 35 v i o = 0 1.8 a 1.22 1.235 1.25 v obsolete product(s) - obsolete product(s)
application information gs-r24fp 8/15 4 application information 4.1 input voltage the recommended maximum operating dc input voltage is 35 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 150 a for v i = 35 v. with inh pin lower than 0.8 v, 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 2 together (see figure 6 ). 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 500 khz, 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. obsolete product(s) - obsolete product(s)
gs-r24fp application information 9/15 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 programm ing (gs-r24fp0001.8 only) the gs-r24fp0001.8 output voltage is 5.54 v 4 % , to reduce this value connect a resistor between pin 10 (fb) and pin 9 (v out ). the resistor must be located very close to the proper pins, to minimize the injected noise (see figure 4 ). the resistor value is calculated using the following formula: for gs-r24fp0001.8 rv = [(v out - 1.235) * 11.3] / 5.54 - v out ) -- [k ? ] v out can be adjusted between 1.235 v (rv = 0 ? ) and 5.54v (rv = open) 4.8 loop compensation (gs-r24fp0001.8 only) if required by particular load conditions, it is possible to change the feedback loop compensation, adding an external capacitor between pin 10 (fb) and pin 9 (v out ), which will act as speed up (see figure 5 ). obsolete product(s) - obsolete product(s)
application information gs-r24fp 10/15 4.9 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. figure 3. soldering table 7. soldering profile feature pb free assembly average ramp up rate ( t smax to t p ) 3 c / sec max preheat: temperature min ( t s min) temperature max ( t s max) time (t s min to t s max) ( t s ) 150 c 200 c 60 ? 100 sec time maintained above : temperature t l time t l 217 c 40 ? 70 sec peak temperature (t p ) 240 + 0 c time within 5 c of actual peak temperature (t p ) 10 ? 20 sec ramp down rate 6 c / sec time from 25 c to peak temperature 8 minutes max obsolete product(s) - obsolete product(s)
gs-r24fp additional features and protections 11/15 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 6. multiple units synchronization figure 4. output voltage programming figure 5. loop compensation rv rload 4, 5 6, 7 10 8, 9 gs-rxxfp000z.z v o u t vin cc rv rload 4, 5 6, 7 10 8, 9 gs-rxxfp000z.z v o u t vin gs-rxxfpyyyz.z 4, 5 6, 7 vin 2 rload v o u t 8, 9 rload 4, 5 6, 7 2 8, 9 gs-rxxfpyyyz.z v o u t vin obsolete product(s) - obsolete product(s)
additional features and protections gs-r24fp 12/15 figure 7. pcb footprint for gs-r24fsxxx1.8 (dimensions in mm) obsolete product(s) - obsolete product(s)
gs-r24fp ordering scheme 13/15 6 ordering scheme table 8. ordering information scheme gs- r12 fv 018 1.8 input voltage 24 = 24 v package v = vertical s = smd output voltage 018 = 1.8 v 025 = 2.5 v 033 = 3.3 v 050 = 5.0 v 000 = 1.235 5.5 v output current 1.8 = 1.8 a obsolete product(s) - obsolete product(s)
revision history gs-r24fp 14/15 7 revision history table 9. document revision history date revision changes 13-oct-2006 1 initial release 27-feb-2008 2 added: section 4.9: soldering on page 10 obsolete product(s) - obsolete product(s)
gs-r24fp 15/15 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2008 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com obsolete product(s) - obsolete product(s)

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