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december 2011 doc id 12344 rev 7 1/19 19 rhfl7913a rad-hard adjustable nega tive voltage regulator features 3 a low dropout voltage optional overtemperature and overcurrent protection adjustable overcu rrent limitation load short circuit monitoring adjustable output voltage inhibit (on/off) ttl-compatible control programmable output short-circuit current limitation remote sensing operation rad-hard: sustains 300 krad in mil-1019.7 at high & eldrs low dose rate conditions heavy ions, sel immune at 68 mev/cm2/mg let ions description the rhfl7913a adjustable is a high performance rad hard negative voltage regulator. available in flat-16 an d new smd5c hermetic ceramic packages, it is specifically intended for space and harsh radiation environments. it provides exceptional electrical performances, high speed and low dropout voltage. input supply ranges from - 3 v to - 12 v. it also provide logical control / monitor functions (inhibit, output monitor, short-circuit control) from/to external positive voltage signals, while the entire rhfl7913a adjustable analog functions are biased at negative voltages with respect of ground pin. the device is qml-v qualified with smd 5962-02532. flat-16 smd5c: 5-connection smd www.st.com
contents rhfl7913a 2/19 doc id 12344 rev 7 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 adj pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2 inhibit on-off control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.3 overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.4 overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.5 ocm pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.6 alternates to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1 remote sensing operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 die information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9 packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10 order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 11 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
rhfl7913a diagram doc id 12344 rev 7 3/19 1 diagram figure 1. block diagram
pin configuration rhfl7913a 4/19 doc id 12344 rev 7 2 pin configuration figure 2. pin configuration (top view for flat-16, bottom view for smd5c) flat-16 smd5c table 1. pin description pin n flat-16 (1) smd5c (2) dscc part ident. 5962-02532 5962-02532 1v i , negative input v o , negative output 2v i , negative input adj 3v i , negative input inhibit 4i sc gnd 5ocmv i , negative input 6v plus , positive supply 7gnd 8n.c. 9n.c. 10 gnd 11 inhibit 12 adj 13 n.c. 14 v o , negative output 15 v o , negative output 16 v o , negative output 1. the upper metallic package lid and the bottom metallizati on are neither connected to r egulator die nor to package terminals, hence elec trically floating. 2. the upper metallic package lid is neither connected to regulator die nor to pack age terminals, hence electrically floating.
rhfl7913a maximum ratings doc id 12344 rev 7 5/19 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. table 2. maximum operating ratings symbol parameter value unit v i dc input voltage |v in ? v plus | -12 v v plus logical block supply voltage v(+)-v(gnd), unless grounded +5 v i dc voltage, v in? gnd, v plus = 0v -12 v i dc voltage, v in? gnd, v plus =+3v -9 v o dc output voltage range -9 to -1.20 i out output current rhfl7913kpa 2 a rhfl7913sca 3 p d tc = 25 c power dissipation rhfl7913kpa 15 w rhfl7913sca 15 t stg storage temperature range -65 to +150 c t op operating junction temperature range -55 to +150 esd electrostatic discharge capability class 3 table 3. thermal data symbol parameter value unit r thjc thermal resistance junction-case, flat-16 and smd5c 8.3 c/w t sold maximum soldering temperature, 10 sec. 300 c table 4. recommended operating conditions symbol parameter value unit v i input voltage range v i (at v plus = 0v) -12 to -1.3 v v plus positive supply range 0 to +3 v v o output voltage range v plus =0v, v i = -12 to -3.7v -9.5 to -1.2 v v plus =+3v, v i = -9 to -3.7v -6.5 to -1.2 v t a ambient operating temperature range -55 to +125 c
electrical characteristics rhfl7913a 6/19 doc id 12344 rev 7 4 electrical characteristics t j = 25 c, v i = v o + 2.5 v, c i = c o = 1 f, unless otherwise specified. table 5. electrical characteristics symbol parameter test conditions min. typ. max. unit v i operating input voltage i o = 1a (kpa) or 2a (sca) -12 v v o operating output voltage i o = 1a, v o = -1.2v, flat 16 -1.28 -1.16 v i o = 1a, v o = -9v, flat 16 -9.6 -8.7 i o = 2a, v o = -1.2v, smd5c -1.28 -1.16 i o = 2a, v o = -9v, smd5c -9.6 -8.7 v o / v i line regulation v i = v o - 2.5v to -12v, i o = 5ma, t j = 25c 0.2 % v i = v o - 2.5v to -12v, i o = 5ma, t j = -55c and +125c 0.5 v o /v o load regulation v i = v o - 2.5v, i o = 5ma to 400ma, t j = 25c 0.4 v i = v o - 2.5v, i o = 5ma to 400ma t j = -55c and +125c 0.5 v i = v o - 2.5v, i o =-5ma to 1a, t j = 25c 0.5 v i = v o - 2.5v, i o = 5ma to 1a, t j = -55c and +125c 0.6 i q quiescent current on mode i o = 5ma, v i = v o -2.5v, t j = 25c -3 ma i o =-30ma, v i = v o -2.5v, t j = 25c -6 i o = 300ma v i = v o -2.5v, t j = 25c and +125c -15 i o = 300ma v i = v o -2.5v, t j = -55c -20 i o = 1a v i = v o -2.5v, t j = 25c and +125c -30 i o = 1a v i = v o -2.5v, t j = -55c -50 i o = 3a v i = v o -2.5v, v inh = 0, t j = +25c and +125c only for smd5c -90 i o = 2a v i = v o -2.5v, v inh = 0, t j = -55c only for smd5c, tbd i q quiescent current off mode v o = -1.2v, v i = -7v, v plus = +5v, v inh > 2.3v, t j = -55c to +125c 1ma
rhfl7913a electrical characteristics doc id 12344 rev 7 7/19 v d dropout voltage i o = 400ma v o =-2.5v to -9v, t j = 25c -450 mv i o = 400ma v o =-2.5v to -9v, t j = -55c and +125c -500 i o = 1a v o =-2.5v to -9v, t j = 25c -750 i o = 1a v o =-2.5v to -9v, t j = -55c and +125c -800 i plus (1) v plus current v i = -5.5v, v plus = 5v, v inh = 5v, t j = 25c 0.75 ma v i = -5.5v, v plus = +5v, v inh = 5v t j = -55c and +125c 1 svr (1) supply voltage rejection v i = v o ? 2.5v, i o = 5ma, f = 120hz 60 db v i = v o ? 2.5v, i o = 5ma, f = 33khz 20 t plh (1) inhibit propagation delay v inh < 0.8v, v plus = 5v, v i = v o -2.5v i o = 400ma 20 s t phl (1) inhibit propagation delay v inh >2.3v, v plus = 5v, v i = v o -2.5v i o = 400ma 100 v inh(on) inhibit voltage v i = -7v v plus = +5v i o = 5ma t j = -55c to 125c 0.8 v v inh(off) 2.3 i sh shutdown input current v inh =5v 15 a v ocm ocm pin voltage sinked i ocm = 10ma, active low 0.38 v en output noise voltage f = 10hz to 100khz i o = 5ma to 2a 40 vrms 1. these values are guaranteed by design. for each application it?s strongly recommended to comply with the maximum current limit of the package used. table 5. electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit
device description rhfl7913a 8/19 doc id 12344 rev 7 5 device description the rhfl7913a adjustable contains a npn-type power element controlled by signal resulting from amplified comparison between internal temperature compensated band-gap cell and the fraction of the desired output voltage value, generated by an external resistor divider bridge. the npn structure allows acce ss to lower drop out levels because its base current can be routed to ground pin and not to output. to control and monitor the device from / to the external logic world ? usually operating in positive voltage area ? a dedicated logic interface block (inhibit and ocm functions) has been implemented with +3 v to +5 v supplied line v(+). in case v(+) = 0 v, inhibit and ocm functions are not available: in this condition, inhibit function is on and ocm pi n is ?no care?. the device is internally protected by several blocks. 5.1 adj pin the load voltage feed back comes from an external divider resistor bridge middle point to adj pin established between load terminals. 5.2 inhibit on-off control when inhibit pin is ttl-high (positive), the device switches off current and voltage output. the device is on when inhibit pin is set ttl-low. 5.3 overtemperature protection a temperature detector internally monitors power element junction temperature. the device goes off circa 165 - 175 c are reached, and returns on when circa 100 c. when internal temperature detector reaches 170 c, the active power element can be at 225 c: device reliability cannot be granted during extensive operation duration with these conditions. 5.4 overcurrent protection i sc pin. an internal non-fold back sh ort-circuit limitation is set with i short > 4 a (v o is 0 v). this value can be downward modified by an external resistor connected between i sc and v i pins, with a typical value range of 10 k to 200 k . to keep excellent v o regulation, it is necessary to set i short 1.6 times greater than the maximum desired application i o . when i o reaches i short ? 300 ma, the current limitor overrules regulation and v o starts to drop and ocm flag is risen. when no current limitation adjustment is required, i sc pin shall be left unbiased (as it is in 3 pin packages). 5.5 ocm pin goes low when current limitor st arts to be active, otherwise v ocm = v (+). it is bufferized and can sink 10 ma. ocm pin is internally pulled-up by a 50 k resistor. can left open when v (+) = 0.
rhfl7913a device description doc id 12344 rev 7 9/19 5.6 alternates to rhfl7913a is recommended to replace all industry negative regulators due to its exceptional radiation performances. to replace 3-terminal industry devices, use customized rhfl7913 fixed voltage versions.
application information rhfl7913a 10/19 doc id 12344 rev 7 6 application information adjusting output voltage: r1 resistor must be connected between v o and adj pins. r2 resistor must be connected between adj and gnd pins. resistor values can be derived from the following formula: v o = v adj (1 + r1/r2) with v adj = -1.20 v to access all rhfl7913a adjustable functionality, v (+) shall be set at 3.0 v (max 5 v). as a consequence, v i (-) cannot be greater than ?9.0 v (resp. ?7 v) due to ?12 v maximum operation rating. the device is functional as soon as v i - v o voltage difference is slightly above power element saturation voltage. the adjustable pin to ground resistor shall not be greater than 10 k to make output feedback error be below 0.2%. a minimum 0.5 ma i o is necessary to set to ensure perfect ?no-load? regulation. it can be wise to dissipate this current into the divider bridge resistor. all available v i pins shall always be pcb interconnected, the same for all available v o pins, otherwise device stability and re liability cannot be granted. th e inhibit function switches off output current in an electronic way, is very quickly. according to lenz? law, external circuitry reacts with ?ldi/dt terms which can be of high amplitude in case some series- inductance exists. effect would be large transient voltage developed on both device terminals. external schottky diodes set on v i and v o may prevent voltage excursions beyond max ratings. in the worst case, a 14 v zener diode shall protect the device input. in case of capacitive load, a input-output prot ection diode can be necessary to prevent v o to be greater than v i during transient operation. the device has been designed for high stabilit y and low drop out oper ation: minimum 1 f input and output tantalum capacitors are therefore mandatory. typical industry pcb design practices 10 f capacitors values are acc eptable. capacitor esr range is from 0.020 to over 20 . such range turns out to be useful when esr increases at low temperature. when large transient currents are expected, larger value capacitors are necessary. in case of high current operation with expected short-circuit events, caution shall be considered relatively to capacitors. they shall be connected as close as possible form device terminals. as some tantalum capacitor s may permanently fail when submitted to high charge-up surge currents, it is recommended to decouple them with 470 nf polyester or ceramic capacitors. rhfl7913a adjustable being manufactured with very high speed bipolar technology (6 ghz f t transistors), the pcb layout shall be performed with unprecedented care, very low inductance, low mutually coupling lines, other wise high frequency parasitic signals may be picked-up by the device resulting into syst em self-oscillation. in difficult high current circumstances (coming from pcb layout) a 470 nf polyester capacitor connected between v o and adj pin increases stability margins. be nefit is svr performa nces extended to far higher frequencies.
rhfl7913a application information doc id 12344 rev 7 11/19 6.1 remote sensing operation when load is physically far away from device output, the adjustable line can be set as a kelvin sense line by implementing the divi der resistor bridge as close as possible form device, with a decoupling capacitor. the adjust pi n kelvin sense line (to be not coupled with power line) picks-up load voltage (load also locally decoupled with a capacitor). this layout eliminates ohmic drop in load power wire. similarly, by taking advantage of two separate ground terminals: power ground pin shall be directly connected to load ground terminal which is also the system ground, device signal ground shall be separately connected to load ground terminal by another kelvin line: in this way, ground ohmic errors are minimized because the only current flowing into device si gnal ground pin kelvin line is device iq (a matter of a few ma).
die information rhfl7913a 12/19 doc id 12344 rev 7 7 die information rhfl7913a adjustable is also available in die form. space dice are electrically tested by stmicroelectronics in such a way that, when mounted in proper thermal and electrical substrate, they are in full compliance with equivalent packaged device: die physical dimensions. die size: 110 mils x 166 mils die thickness: 375 m +/-25 m (14.8 mils +/- 1 mil) pad size: v i , v o pads: 245 m x 544 m control pads: 184 m x 184 m interface materials top metallization: al/si/cu 1.05 m +/- 0.15 m backside metallization: none glassivation type: p.vapox + nitride thickness: 0.6 m +/- 0.1m + 0.6m +/-0.08 m substrate: silicon (connected to v i = v minus ) the sense pad is layout on the die but is not electrically connected to the ic and shall be left non-bonded during hybrid bonding. figure 3. die size
rhfl7913a package mechanical data doc id 12344 rev 7 13/19 8 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
package mechanical data rhfl7913a 14/19 doc id 12344 rev 7 dim. mm. inch. min. typ. max. min. typ. max. a 2.16 2.72 0.0 8 5 0.107 b 0.4 3 0.017 c0.1 3 0.005 d 9 . 9 10. 39 0 e6. 9 1 0.272 e2 4. 3 2 0.170 e 3 0.76 0.0 3 0 e 1.27 0.050 l 6.72 0.265 q 0.66 1.14 0.026 0.045 s 1 0.1 3 0.005 flat-16 (mil- s td-1 83 5) mechanical data 7450 9 01a 1 8 16 e b c l e d s 1 q a e2 e 3 l e 3 9
rhfl7913a package mechanical data doc id 12344 rev 7 15/19 dim. mm. inch. min. typ. max. min. typ. max. a2. 8 4 3 .00 3 .15 0.112 0.11 8 0.124 a1 0.25 0. 38 0.51 0.010 0.015 0.020 b 7.1 3 7.26 7. 39 0.2 8 1 0.2 8 6 0.2 9 1 b 14. 9 5 5.0 8 5.21 0.1 9 5 0.200 0.205 b 2 2.2 8 2.41 2.54 0.0 9 0 0.0 9 5 0.100 b3 2. 9 2 3 .05 3 .1 8 0.115 0.120 0.125 d1 3 .71 1 3 . 8 41 3 . 9 7 0.540 0.545 0.550 d1 0.76 0.0 3 0 e7. 39 7.52 7.65 0.2 9 1 0.2 9 60. 3 01 e1. 9 1 0.075 s md5c mechanical data 7 9 242 9 6b
packaging rhfl7913a 16/19 doc id 12344 rev 7 9 packaging rhfl7913a adjustable is available in high thermal dissipation 16 pin hermetic flat package, which bottom flange is metallized to allo w direct soldering to heat sink (efficient thermal conductivity). it is also ava ilable in smd5c hermetic ceramic package.
rhfl7913a order codes doc id 12344 rev 7 17/19 10 order codes note: em1: engineering parts, full temperature range, flight packages, no burn-in em2: same as above but with burn-in, used in satellite eqms table 6. order codes die flat-16 smd5c terminal finish quality level rhfl7913kpa1 gold em1 rhfl7913kpa2 gold em2 = em1 + 48hours bi rhfl7913kpa-01v gold qml-v rhfl7913kpa-02v solder qml-v rhfl7913sca1 gold em1 rhfl7913sca2 gold em2 = em1 + 48hours bi rhfl7913sca-03v gold l7913adie2s em1 die l7913adie2v qml-v table 7. part number - smd equivalent st part number smd part number rhfl7913kpa-01v 5962f0253201vxc rhfl7913kpa-02v 5962f0253201vxa rhfl7913sca-03v 5962f0253202vyc l7913adie2v 5962f0253201v9a table 8. environmental characteristics parameter conditions value unit output voltage thermal drift -55 c to +125 c 40 ppm/c output voltage radiation drift from 0 kr ad to 300 krad at 0.55rd/sec 8 ppm/krad output voltage radiation drift from 0 krad to 300 krad, mil1019.5 6 ppm/krad
revision history rhfl7913a 18/19 doc id 12344 rev 7 11 revision history table 9. document revision history date revision changes 16-may-2006 1 first release. 22-aug-2006 2 the pin description for smd5c on table 1 updated. 19-dec-2007 3 modified: ta bl e 6 . 26-aug-2008 4 modified: features on page 1 , table 1 on page 4 , the v i value table 4 on page 5 , table 5 on page 6 and section 6 on page 10 . 22-sep-2008 5 modified: table 1 on page 4 for smd5c. 07-feb-2011 6 added: note table 1 on page 4 . 07-dec-2011 7 removed the note under table 1 on page 4 and added footnotes 1 and 2.
rhfl7913a doc id 12344 rev 7 19/19 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 two authorized st representatives, 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. ? 2011 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 - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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