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05 /01 rev 1. 5

copyright ? 1999

1 ? ? !"#$ %&

the sg7900a/sg7900 series of negative regulators offer self-contained, fixed-voltage capability with up to 1.5a of load current. with a variety of output voltages and four package options this regulator series is an optimum complement to the sg7800a/sg7800, sg140 line of three terminal regulators. these units feature a unique band gap reference which allows the sg7900a series to be specified with an output voltage tolerance of 1.5%. the sg7900a versions also offer much improved line regulation character- istics. all protective features of thermal shutdown, current limiting, and safe-area control have been designed into these units and since these regulators require only a single output capacitor (sg7900 series) or a capacitor and 5ma minimum load (sg120 series) for satisfactory performance, ease of application is assured. although designed as fixed-voltage regulators, the output voltage can be increased through the use of a simple voltage divider. the low quiescent drain current of the device insures good regulation when this method is used, especially for the sg120 series. these devices are available in hermetically sealed to-257, to-3, to-39 and lcc package. description features ?? ?? ? output voltage set internally to 1.5% on sg7900a ?? ?? ? output current to 1.5a ?? ?? ? excellent line and load regulation ?? ?? ? foldback current limiting ?? ?? ? thermal overload protection ?? ?? ? voltages available: -5v, -12v, -15v ?? ?? ? contact factory for other voltage options ?? ?? ? available in surface mount package high reliability features - sg7900a/sg7900 ?? ?? ? available to mil-std - 883 ?? ?? ? mil-m38510/11501bxa - jan7905t ?? ?? ? mil-m38510/11505bya - jan7905k ?? ?? ? mil-m38510/11502bxa - jan7912t ?? ?? ? mil-m38510/11506bya - jan7912k ?? ?? ? mil-m38510/11503bxa - jan7915t ?? ?? ? mil-m38510/11507bya - jan7915k ?? ?? ? lmi level "s" processing available schematic diagram ** ** for normal operation the (v os ) sense pin must be externally connected to the load.

0 5/ 0 1 rev 1. 5

copyright ? 1999

2 ? ? !"#$ %& absolute maximum ratings (note 1)

device input voltage differential output voltage input voltage (output shorted to ground) -5v -35v 35v -12v -35v 35v -15v -40v 35v 150 c -65 c to 150 c 300 c operating junction temperature hermetic (k, t, ig & l - packages) ........................ storage temperature range .......................... lead temperature (soldering, 10 seconds) ................. note 1. values beyond which damage may occur. thermal data k package: thermal resistance- junction to case , jc ................. 3.0c/w thermal resistance- junction to ambient , ja ............... 35c/w t package: thermal resistance- junction to case , jc .................. 15c/w thermal resistance- junction to ambient , ja ............ 120c/w ig package: thermal resistance- junction to case , jc ................. 3.5c/w thermal resistance- junction to ambient , ja .............. 42c/w l package: thermal resistance- junction to case , jc .................. 35c/w thermal resistance- junction to ambient , ja ............ 120c/w note a. junction temperature calculation: t j = t a + (p d x ja ). note b. the above numbers for jc are maximums for the limiting thermal resistance of the package in a standard mounting configuration. the ja numbers are meant to be guidelines for the thermal performance of the device/pc-board system. all of the above assume no ambient airflow. figure 1. maximum average power dissipation figure 2. quiescent current vs. load figure 3. temperature coefficient note 2. range over which the device is functional. characteristic curves -55 c to 150 c operating junction temperature range: sg7900a/7900 ............................................. recommended operating conditions (note 2)

05 / 01 rev 1. 5

copyright ? 1999

3 ? ? !"#$ %& figure 6. short circuit current vs. v in characteristic curves (continued) figure 4. shortcircuit current vs. v in figure 5. quiescent current vs. v in figure 7. dropout characteristics figure 8. ripple rejection vs. frequency applications figure 9 - fixed output regulator figure 10 - circuit for increasing output voltage note: 1. c1 is required only if regulator is separated from rectifier filter. 2. both c1 and c2 should be low e.s.r. types such as solid tantalum. if aluminum electrolytics are used, at least 10 times values shown should be selected. 3. if large output capacities are used, the regulators must be protected from momentary input shorts. a high current diode note: c3 optional for improved transient response and ripple rejec r 2 = v(reg) 15ma v out = v (regulator) r 1 + r 2 r 1

0 5 / 0 1 rev 1. 5

copyright ? 1999

4 ? ? !"#$ %&

electrical specifications (note 1) (unless otherwise specified, these specifications apply over the operating ambient temperatures for sg7905a/sg7905 with -55 c t a 150 c, v in = -10v, i o = 500ma for the k and ig -power packages-, i o = 100ma for the t and l packages, c in = 2 f, and c out = 1.0 f. low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) sg7905a/sg7905 units sg7905 min. typ. max. min. typ. max. sg7905a -5.0 3 1 15 15 5 -5.00 -5.00 1.1 25 20 175 test conditions parameter output voltage line regulation (note 1) load regulation (note 1) total output voltage tolerance quiescent current quiescent current change dropout voltage peak output current short circuit current ripple rejection output noise voltage (rms) long term stability thermal shutdown -4.8 -4.70 -4.70 1.5 0.5 54 v mv mv mv mv mv v v ma ma ma ma ma v a a a a db v/v mv c -5.2 50 25 100 25 100 -5.30 -5.30 2.5 2.0 1.3 0.5 0.5 2.3 3.3 1.4 1.2 0.6 80 -5.08 25 12 75 25 30 -5.15 -5.15 2.5 2.0 1.3 0.5 0.5 2.3 3.3 1.4 1.2 0.6 80 -5.00 5 3 15 15 5 -5.00 -5.00 1.1 25 20 175 -4.92 -4.85 -4.85 1.5 0.5 54 t j = 25c v in = -7.5v to -25v, t j = 25c v in = -8v to -12v, t j = 25 c power pkgs: i o = 5ma to 1.5a, t j = 25c i o = 250ma to 750ma, t j = 25c t - pkg: i o = 5ma to 500ma, t j = 25c v in = -8v to -20v power pkgs: i o = 5ma to 1.0a, p 20w t - pkg: i o = 5ma to 500ma, p 2w over temperature range t j = 25c with line: v in = -8v to -25v with load: i o = 5ma to 1.0a (power packages) i o = 5ma to 500ma (t) ? v o = 100mv, t j = 25c power pkgs: i o = 1.0a, t - pkg: i o = 500ma power pkgs: t j = 25c t - pkg: t j = 25c power pkgs: v in = -35v, t j = 25c t - pkg: v in = -35v, t j = 25c ? v in = 10v, f = 120hz, t j = 25c f = 10hz to 100khz (note 2) 1000hrs. at t j = 125c i o = 5ma note 1. all regulation tests are made at constant junction temperature with low duty cycle testing. 2. this test is guaranteed but is not tested in production.

0 5 / 0 1 rev 1. 5

copyright ? 1999

5 ? ? !"#$ %&

electrical specifications (note 1) (unless otherwise specified, these specifications apply over the operating ambient temperatures for sg7912a/sg7912 with -55 c t a 150 c, v in = -19v, i o = 500ma for the k and ig -power packages-, i o = 100ma for the t and l packages, c in = 2 f, and c out = 1.0 f. low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) sg7912a/sg7912 units sg7912 min. typ. max. min. typ. max. sg7912a test conditions parameter t j = 25c v in = -14.5v to -30v, t j = 25c v in = -16v to -22v, t j = 25 c power pkgs: i o = 5ma to 1.5a, t j = 25c i o = 250ma to 750ma, t j = 25c t - pkg: i o = 5ma to 500ma, t j = 25c v in = -14.5v to -27v power pkgs: i o = 5ma to 1.0a, p 20w t - pkg: i o = 5ma to 500ma, p 2w over temperature range t j = 25c with line: v in = -14.5v to -30v with load: i o = 5ma to 1.0a (power packages) i o = 5ma to 500ma (t) ? v o = 100mv, t j = 25c power pkgs: i o = 1.0a, t - pkg: i o = 500ma power pkgs: t j = 25c t - pkg: t j = 25c power pkgs: v in = -35v, t j = 25c t - pkg: v in = -35v, t j = 25c ? v in = 10v, f = 120hz, t j = 25c f = 10hz to 100khz (note 2) 1000hrs. at t j = 125c i o = 5ma output voltage line regulation (note 1) load regulation (note 1) total output voltage tolerance quiescent current quiescent current change dropout voltage peak output current short circuit current ripple rejection output noise voltage (rms) long term stability thermal shutdown -11.8 -11.7 -11.7 1.5 0.5 54 -12.0 4 3 20 10 10 -12.0 -12.0 1.1 25 60 175 -12.2 60 30 90 40 40 -12.3 -12.3 4 3 1.0 0.5 0.5 2.3 3.3 1.4 1.2 0.6 80 -12.0 10 3 12 4 10 -12.0 -12.0 1.1 25 60 175 -12.5 120 60 120 60 240 -12.6 -12.6 4 3 1.0 0.5 0.5 2.3 3.3 1.4 0.2 0.6 80 -11.5 -11.4 -11.4 1.5 0.5 54 v mv mv mv mv mv v v ma ma ma ma ma v a a a a db v/v mv c note 1 . all regulation tests are made at constant junction temperature with low duty cycle testing. 2. this test is guaranteed but is not tested in production.

0 5 / 01 rev 1. 5

copyright ? 1999

6 ? ? !"#$ %&

electrical specifications (note 1) (unless otherwise specified, these specifications apply over the operating ambient temperatures for sg7915a/sg7915 with -55 c t a 150 c, v in = -23v, i o = 500ma for the k and ig -power packages-, i o = 100ma for the t and l packages, c in = 2 f, and c out = 1.0 f. low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) sg7915a/sg7915 units sg7915 min. typ. max. min. typ. max. sg7915a test conditions parameter t j = 25c v in = -17.5v to -30v, t j = 25c v in = -20v to -25v, t j = 25 c power pkgs: i o = 5ma to 1.5a, t j = 25c i o = 250ma to 750ma, t j = 25c t - pkg: i o = 5ma to 500ma, t j = 25c v in = -18.5v to -30v power pkgs: i o = 5ma to 1.0a, p 20w t - pkg: i o = 5ma to 500ma, p 2w over temperature range t j = 25c with line: v in = -18.5v to -30v with load: i o = 5ma to 1.0a (power packages) i o = 5ma to 500ma (t) ? v o = 100mv, t j = 25c power pkgs: i o = 1.0a, t - pkg: i o = 500ma power pkgs: t j = 25c t - pkg: t j = 25c power pkgs: v in = -35v, t j = 25c t - pkg: v in = -35v, t j = 25c ? v in = 10v, f = 120hz, t j = 25c f = 10hz to 100khz (note 2) 1000hrs. at t j = 125c i o = 5ma output voltage line regulation (note 1) load regulation (note 1) total output voltage tolerance quiescent current quiescent current change dropout voltage peak output current short circuit current ripple rejection output noise voltage (rms) long term stability thermal shutdown v mv mv mv mv mv v v ma ma ma ma ma v a a a a db v/v mv c -15.6 150 75 150 75 240 -15.75 -15.75 4 3 1.0 0.5 0.5 2.3 3.3 1.4 1.2 0.6 80 -15.0 11 3 12 4 10 -15.00 -15.00 1.1 25 60 175 -14.4 -14.25 -14.25 1.5 0.5 54 -15.2 75 40 100 50 50 -15.4 -15.4 4 3 1.0 0.5 0.5 2.3 3.3 1.4 1.2 0.6 80 -15.0 5 3 30 4 10 -15.0 -15.0 1.1 25 60 175 -14.8 -14.6 -14.6 1.5 0.5 54 note 1 . all regulation tests are made at constant junction temperature with low duty cycle testing. 2. this test is guaranteed but is not tested in production.

05 /0 1 rev 1. 5

copyright ? 1999

7 ? ? !"#$ %& connection diagrams & ordering information (see notes below)

part no. package connection diagram 3-terminal to-3 metal can k-package sg79xxak/883b -55c to 125c sg7905ak/desc -55c to 125c sg7912ak/desc -55c to 125c sg7915ak/desc -55c to 125c sg79xxak -55c to 125c sg79xxk/883b -55c to 125c jan7905k -55c to 125c jan7912k -55c to 125c jan7915k -55c to 125c sg79xxk -55c to 125c sg79xxk 0c to 125c 2 1 ground case is v in v out ambient temperature range 3-pin to-39 metal can t-package sg79xxat/883b -55c to 125c sg7905at/desc -55c to 125c sg7912at/desc -55c to 125c sg7915at/desc -55c to 125c sg79xxat -55c to 125c sg79xxt/883b -55c to 125c jan7905t -55c to 125c jan7912t -55c to 125c jan7915t -55c to 125c sg79xxt -55c to 125c 32 v in v out ground 1 case is v in 3-pin hermetic to-257 ig-package (isolated) sg79xxaig/883b -55c to 125c sg7905aig/desc -55c to 125c sg7912aig/desc -55c to 125c sg7915aig/desc -55c to 125c sg79xxaig -55c to 125c sg79xxig/883b -55c to 125c sg79xxig -55c to 125c ground v out v in 20-pin ceramic leadless chip carrier l- package sg79xxl/883b -55c to 125c sg79xxl -55c to 125c sg7905al/desc -55c to 125c sg7912al/desc -55c to 125c sg7915al/desc -55c to 125c 4 5 6 7 8 321 14 15 16 17 18 20 19 9 111213 10 11. n.c. 12. n.c. 13. n.c. 14. n.c. 15. gnd 16. n.c. 17. gnd 18. n.c. 19. n.c. 20. v in 1. n.c. 2. v in 3. n.c. 4. v o 5. v o 6. n.c. 7. v o sense 8. n.c. 9. n.c. 10. n.c. note 1. contact factory for jan and desc product availability. 2. all parts are viewed from the top. 3. "xx" to be replaced by output voltage of specific fixed regulator. 4. some products will be available in hermetic flat pack (f). consult factory for price and availability. 5. both inputs and outputs must be externally connected together at the device terminals. 6. for normal operation, the v o sense pin must be externally connected to the load. (see notes 5 & 6)

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