MP8201 precision adjustable shunt voltage regulator MP8201 rev. 0.9 www.monolithicpower.com 1 9/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. the future of analog ic technology description the MP8201 is a low voltage, precision, adjustable shunt regulator. the MP8201 can operate from 1.2v to 12v where the desired value is set by external resistors. this wide dynamic rang, gives the designers outstanding flexibility in the development of power supplies and instrumentation. the operating current of 60ua makes the part well suited for battery- powered portable electronic applications. the 8201 regulates the output voltage from as low as 1.2v. the part has a sharp turn-on characteristic and a dynamic resistance of less than 1 ? . the MP8201 is offered in 3-pin sot23 packages. features ? wide input voltage range: 1.2v to 12v ? operating current from 60a to 20ma ? sot-23 package ? initial accuracy: 0.5% ? 1 ? dynamic output resistance of ? stable with no external capacitor ? temperature range: ?40c to +85 c applications ? instrumentation ? linear regulators ? notebook computers ? medical electronics ? 3v/ 5v 8-12 bit data converters ? battery-powered equipment ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. typical application r1 r2 v+ v- v ref 1 3 2 u1 MP8201 v cc r bias v out
MP8201 ? low voltage, adjustable shunt voltage regulator MP8201 rev. 0.9 www.monolithicpower.com 2 9/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. ordering information part number* package top marking temperature MP8201dt sot23-3 iz6 ?40 c to +85 c * for tape & reel, add suffix ?z (eg. MP8201dt?z). for rohs compliant packaging, add suffix ?lf (eg. MP8201dt?lf?z) package reference v ref v+ v- top view 1 2 3 absolute maxi mum ratings (1) reverse current ....................................... 20ma forward current........................................ 20ma continuous power dissipation (t a = +25c) (2) ?????????????????....0.52w junction temperature ...............................150 c lead temperature ....................................260 c storage temperature ............. ?65c to +150 c recommended operating conditions (3) input voltage....................................1.2v to 12v output voltage .................................1.2v to 10v operating temperature............. ?40 c to +85 c thermal resistance (4) ja jc sot23-3 ................................ 240 .... 110.. c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP8201 ? low voltage, adjustable shunt voltage regulator MP8201 rev. 0.9 www.monolithicpower.com 3 9/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. electrical characteristics vout = 1.2v, i in = 100a to 10ma, t a = +25 c, typicals are at 25 c, unless otherwise noted. parameter symbol condition min typ max units reference voltage (5) v ref 159.2 160 160.8 mv v oerr ?0.8 +0.8 mv initial accuracy ?0.5 +0.5 % 0 c to < +70 c 70 temperature coefficient a grade tcv o ?40 c to +85 c 85 ppm/ c ratio of the change in v ref changed to v out voltage change v ref / v out i in = 0.1ma to 10ma 1 mv dynamic output impedance ( v r / i r ) i in = 1ma 100a 1 ? minimum operating current i in 100 60 a voltage noise f = 0.1hz to 10hz 4 v p-p turn-on settling time t r within 0.1% of output 10 s output voltage hysteresis 50 ppm note: 5) the forward diode voltage characteristic at ?1ma is typically 0.65v.
MP8201 ? low voltage, adjustable shunt voltage regulator MP8201 rev. 0.9 www.monolithicpower.com 4 9/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. typical performanc e characteristics i in =100ua to 10ma, t a =25oc unless otherwise noted. v ref vs. temperature i in =0.1ma, v out =2v v out =1.2v load regulation v out =2.5v load regulation v out =3.3v load regulation v out =1.8 v load regulation 160.0 160.8 161.6 162.4 163.2 164.0 -50 0 50 100 150 v ref voltage ( mv ) 1.16 1.18 1.20 1.22 1.24 1.26 0 5 10 15 20 25 i in ( ma ) 1.76 1.78 1.80 1.82 1.84 1.86 0 5 10 15 20 25 i in ( ma ) v out ( v ) v out ( v ) v out ( v ) v out ( v ) 2.46 2.48 2.50 2.52 2.54 2.56 0 5 10 15 20 25 3.26 3.28 3.30 3.32 3.34 3.36 0 5 10 15 20 25 i in ( ma ) i in ( ma ) turn on with load capacitor i in =1ma, i out =10ma, v out =1.8v c out =4.7uf turn off with load capacitor i in =1ma, i out =10ma, v out =1.8v c out =4.7uf v out 1v/div v in 5v/div i out 10ma/div v out 1v/div v in 5v/div i out 10ma/div 4ms/div 40ms/div line transient v in =3v to 10v, v out =1.8v, c out =4.7uf v out 50mv/div v in 5v/div v out 20mv/div i out 10ma/div load transient v out =1.8v, i out =10ma, c out =4.7uf
MP8201 ? low voltage, adjustable shunt voltage regulator MP8201 rev. 0.9 www.monolithicpower.com 5 9/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. pin functions pin # name description 1 v+ cathode 2 v? anode 3 vref adjustable connection function block diagram - + r1 r2 v+ v- v ref figure 1?functional block diagram
MP8201 ? low voltage, adjustable shunt voltage regulator MP8201 rev. 0.9 www.monolithicpower.com 6 9/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. application information external bias resistor in the case of shunt voltage references, an external bias resistor (r bias ) is required between the supply voltage and the MP8201. r bias sets the current that is required to pass through the load and the ic. the load and the supply voltage can vary, so r bias should be chosen such that is it small enough to supply the minimum current to the MP8201 when the supply voltage is at its minimum and the load current is at its maximum. in addition, r bias needs to be large enough that the quiescent current does not exceed 10ma when the supply voltage is at its maximum and the load current is at its minimum. choose r bias using the following equation: q l out supply bias i i v v r + ? = adjustable precision voltage source the MP8201 can be combined with a precision op amp to produce a precise adjustable output voltage. see figure 1. the output of the op amp is determined by the gain of the circuit using the following equation: 2 r 1 r 1 v out + = an optional capacitor can be added in parallel with r2 to filter out high frequency noise. r b v out v cc 1 3 2 MP8201 3 4 1 2 5 + - mp8101 r2 r1 c1 r bias figure 1?adjustable precision voltage source output voltage trim using a mechanical or digital potentiometer, the output voltage of the MP8201 can be trimmed to 0.5%. see figure 2. note that trimming other resistor values may not produce an accurate output from the mp8200. r bias v out v cc 1 3 2 MP8201 figure 2?output voltage trim precise negative voltage reference the MP8201 can be configured for use in applications where a precise negative voltage reference is needed. v out r1 v dd 1 3 2 MP8201 figure 3?precise ?1.0v reference choose r1 such that 60a to 20ma is provided to properly bias the MP8201, using the equation: i v 1 r dd =
MP8201 ? low voltage, adjustable shunt voltage regulator notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP8201 rev. 0.9 www.monolithicpower.com 7 9/30/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. package information sot23-3
|
