EV2101DQ-00A 1.6mhz, 800ma synchronous step-down converter plus 200ma ldo evaluation board EV2101DQ-00A rev. 1.1 www.monolithicpower.com 1 8/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. the future of analog ic technology tm tm description the EV2101DQ-00A is the evaluation board for the mp2101 step-down converter. it is designed for high efficiency, step-down applications. the mp2101 is a 1.6mhz current mode synchronous buck converter plus ldo, which provides two regulated output rails. both control loops are internally compensated, and all power devices are integrated. channel 1 is a synchronous buck providing up to 92% efficiency and 800ma output current from a 2.5v to 6v input voltage. channel 2 is an ldo that can supply up to 200ma of load current from either the power input or the output of channel 1 to minimize the overall power loss and output noises. the mp2101 is available in a space-saving 3mm x 3mm qfn10 package with an exposed pad. electrical specifications parameter symbol value units input voltage range v in 2.5 ? 6.0 v v out1 1.8 v output voltage v out2 1.2 v i out1 800 ma load max i out2 200 ma features ? 0.8a and 0.2a outputs ? 2.5v to 6v operating input range ? independently adjustable outputs from 0.6v to v in ? independently external enable control ? pwrok pin monitors output regulation ? 3% output voltage reference over temperature ? small solution size applications ? dvd+/-rw drive ? smart phones ? pdas ? digital cameras ? portable instruments ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. EV2101DQ-00A evaluation board (l x w x h) 2.3? x 2.0? x 0.4? (5.8cm x 5.1cm x 1.0cm) board number mps ic number EV2101DQ-00A mp2101dq 10 100 1000 load current (ma) efficiency vs load current 100 95 90 85 80 75 70 65 60 55 50 45 40 35 efficiency (%) v in =3.3v v in =4.2v v in =5.0v
EV2101DQ-00A ? 1.6mhz, 800ma synchronous step-down plus 200ma ldo evaluation board EV2101DQ-00A rev. 1.1 www.monolithicpower.com 2 8/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. evaluation board schematic out2 fb2 sw fb1 mp2101 en2 3 2 6 4 1 5 10 7 8 9 pwrok gnd en1 u1 in1 in2 vin1 2.5v - 6v vout1 1.8v/800ma gnd vout2 1.2v/200ma gnd gnd jp1 vin2 en1 vin vin en2 pwrok jp2 jp3 EV2101DQ-00A bill of materials qty ref value description package manufacturer manufacturer p/n 1 c1 4.7f ceramic cap., 16v, x7r 1206 tdk c3216x7r1c475k 1 c2 10f ceramic cap., 10v, x5r 1210 tdk c3225x5r1a106m 1 c3 1f ceramic cap., 16v, x7r 1206 tdk c3216x7r1c105k 1 c4 2.2f ceramic cap., 16v, x7r 1206 tdk c3216x7r1c225k 1 jp1 3-pin header, 0.1" sullins ptc03saan d52lc inductor, 1.63a smd toko a914byw-2r2m 1 l1 2.2h cr32 inductor, 1.28a smd sumida cr32-2r2mc 2 r1, r7 300k ? film res., 1% 603 yageo 9c06031a3003fkhft 1 r2 150k ? film res., 1% 603 panasonic erj-3ekf1503v 2 r3, r4 60.4k ? film res., 1% 603 panasonic erj-3ekf6042v 2 r5, r6 100k ? film res., 5% 603 panasonic erj-3geyj104v 1 u1 dc-dc converter qfn10 mps mp2101dq
EV2101DQ-00A ? 1.6mhz, 800ma synchronous step-down plus 200ma ldo evaluation board EV2101DQ-00A rev. 1.1 www.monolithicpower.com 3 8/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. typical performanc e characteristics v en 2v/div. v out1 1v/div. v out2 1v/div. pwrok 2v/div. enable turn on v in1 = v in2 = 3.6v, v out1 = 1.8v, v out2 = 1.2v, en1 = en2 = 3.6v i load1 = 0.3a, i load2 = 0.1a with resistive load v out1 0.1v/div. i l1 0.5a/div. v out2 50mv/div. i l2 0.1a/div. load transient of synchronous buck v in = 3.6v, v out1 = 1.8v i load1 = 0.8a with resistive load ldo load transient v in = v in2 = 3.6v, v out2 = 1.2v i load2 = 0.02a to 0.15a with resistive load v in 2v/div. v out1 2v/div. v out2 1v/div. v in 2v/div. v out1 2v/div. v out2 1v/div. 1ms/div. input ramp up v in1 = v in2 = 3.6v, v out1 = 1.8v, v out2 = 1.2v, en1 = en2 = 3.6v i load1 = 0.3a, i load2 = 0.1a with resistive load 1ms/div. input ramp down v in1 = v in2 = 3.6v, v out1 = 1.8v, v out2 = 1.2v, en1 = en2 = 3.6v i load1 =0.3a, i load2 = 0.1a with resistive load enable turn off v in1 = v in2 = 3.6v, v out1 = 1.8v, v out2 = 1.2v, en1 = en2 = 3.6v i load1 = 0.3a, i load2 = 0.1a with resistive load v en 5v/div. v out1 1v/div. v out2 1v/div. pwrok 5v/div.
EV2101DQ-00A ? 1.6mhz, 800ma synchronous step-down plus 200ma ldo evaluation board EV2101DQ-00A rev. 1.1 www.monolithicpower.com 4 8/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
EV2101DQ-00A ? 1.6mhz, 800ma synchronous step-down plus 200ma ldo evaluation board notice: the information in this document is subject to change without notice. users should warrant 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. EV2101DQ-00A rev. 1.1 www.monolithicpower.com 5 8/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. quick start guide the output voltages on this board are set to 1.8v and 1.2v. the board layout accommodates most commonly used inductors and output capacitors. 1. attach the positive and negative ends of the load to the vout1/vout2 and gnd pins, respectively. 2. with the input supply off, attach the input voltage, 2.5v v in 6v, and the input ground to the vin and gnd pins, respectively. then turn on the power supply. 3. to enable the mp2101, apply a voltage, 1.5v v en 6v, to the en1/en2 pin. to disable the mp2101, apply a voltage, v en < 0.3v, to the en1/en2 pin. the default setting for the jumper on the board connects v in to the en1/en2 pin. in this configuration, the part will operate without applying any external voltage to the en1/en2 pin. 4. the output voltages v out1 and v out2 can be changed by varying r2 and r4, respectively. calculate the new value by the formula: 1 v v 1 r 2 r 1 fb 1 out ? ? ? ? ? ? ? ? ? = 1 v v 3 r 4 r 2 fb 2 out ? ? ? ? ? ? ? ? ? = where v fb1 = v fb2 = 0.6v, r1 = 300k ? , and r4 = 60.4k ? example: for v out1 = 2.5v: ? = ? ? ? ? ? ? ? ? = k 7 . 94 1 v 6 . 0 v 5 . 2 k 300 2 r therefore, use a 95.3k ? standard 1% value. 5. the jp1 setting: the jp1 can set the ldo input voltage from v in1 or v out1 . 6. en1/en2 setting: jp2 and jp3 the en1/en2 signals can be turned on by connecting to the input voltage v in1 or an external signal.
|
