Overloading an LM317
in [Design]
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From: RST Engineering on 10 Aug 2010 13:33 Does there exist a smaller cheap lower current version of the 317? Sort of like the 78Lxx to the 78xx comparison. Jim
From: John Larkin on 10 Aug 2010 14:17 On Tue, 10 Aug 2010 10:33:12 -0700, RST Engineering <jweir43(a)gmail.com> wrote: > >Does there exist a smaller cheap lower current version of the 317? >Sort of like the 78Lxx to the 78xx comparison. > >Jim LM317L is available in TO92, SO8, and a silly BGA sort of package with 0.5 mm pitch! It current limits at about 200 mA; I posted a thermal-cycling waveform. John
From: RST Engineering on 10 Aug 2010 15:36 On Tue, 10 Aug 2010 11:17:57 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Tue, 10 Aug 2010 10:33:12 -0700, RST Engineering ><jweir43(a)gmail.com> wrote: > >> >>Does there exist a smaller cheap lower current version of the 317? >>Sort of like the 78Lxx to the 78xx comparison. >> >>Jim > >LM317L is available in TO92, SO8, and a silly BGA sort of package with >0.5 mm pitch! > >It current limits at about 200 mA; I posted a thermal-cycling >waveform. I found it. Thanks. Dumb old me thought that since the 317 is filed in the databook under the 117 that surely an L suffix would be in the same place. The 317L is only available in the 317 temperature range. However, I only find it in the National book with the TO-92 and 8-pin SOIC packages. It also looks like the 337L is the same device but restricted to about 100 mA. Thanks again... Jim
From: John Larkin on 10 Aug 2010 16:23
On Tue, 10 Aug 2010 12:36:18 -0700, RST Engineering <jweir43(a)gmail.com> wrote: >On Tue, 10 Aug 2010 11:17:57 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Tue, 10 Aug 2010 10:33:12 -0700, RST Engineering >><jweir43(a)gmail.com> wrote: >> >>> >>>Does there exist a smaller cheap lower current version of the 317? >>>Sort of like the 78Lxx to the 78xx comparison. >>> >>>Jim >> >>LM317L is available in TO92, SO8, and a silly BGA sort of package with >>0.5 mm pitch! >> >>It current limits at about 200 mA; I posted a thermal-cycling >>waveform. > >I found it. Thanks. Dumb old me thought that since the 317 is filed >in the databook under the 117 that surely an L suffix would be in the >same place. The 317L is only available in the 317 temperature range. > >However, I only find it in the National book with the TO-92 and 8-pin >SOIC packages. > >It also looks like the 337L is the same device but restricted to about >100 mA. > > >Thanks again... > >Jim Try online. The micro-smd package is new. If I use it, it might get my lynched. John |