Datasheet ZXRE160 (Diodes) - 9

A Product Line of Diodes Incorporated ZXRE160 Application Information
(cont.)
T UC NEW PROD
⎛ 1 R ⎞ OUT V = REF V V = V ⎜1+ ⎟ OUT REF ⎝ 2 R ⎠
Figure 6. 0.6V Series LDO Regulator Figure 7. 1.0V Series LDO Regulator Design guide:
1. Determine IOUT and choose a suitable transistor taking power dissipation into consideration. I (max) OUT 2. Determine IB from I = B h ( + ) 1 (min) FE 3. Determine IR3 from ≥ (min) KA I B I 3 R I + . The design of the ZXRE160 effectively means there is no IKA(min) limitation as in conventional references. There is only an output leakage current which is a maximum of 1µA. Nevertheless, it is necessary to determine an IKA(min) to ensure that the device operates within its linear range at all times. IKA(min) ≥ 10µA should be adequate for this. − + 4. Determine R3 from IN V ( OUT V BE V ) 3 R = . R I 3 Although unlikely to be a problem, ensure that IR3 ≤ 15 mA. ZXRE160 9 of 15 June 2012 Document number: DS35688 Rev. 2 - 2
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