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rt 8293ahzsp evaluation board ug8293 ahzsp - 00 march 2014 www.richtek.com purpose the rt8293a is a high - efficiency current mode synchronous step - down regulator that can deliver up to 3a output current from a wide input voltage range of 4.5v to 23v. this document explains the function and use of the rt8293a evaluation board ( evb) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements. table of contents purpose ................................ ................................ ................................ ................................ ....... 1 introduction ................................ ................................ ................................ ................................ .. 2 general product information ................................ ................................ ................................ ..... 2 key performance summary table ................................ ................................ ............................ 3 bench test setup conditions ................................ ................................ ................................ ....... 4 headers description and placement ................................ ................................ ......................... 4 test points ................................ ................................ ................................ ............................... 4 power - up & measurement procedure ................................ ................................ ....................... 5 output voltage setting ................................ ................................ ................................ .............. 5 schematic , bill of materials and board layout ................................ ................................ ............. 6 evb schematic diagram ................................ ................................ ................................ .......... 6 bill of materials ................................ ................................ ................................ ......................... 7 evb layout ................................ ................................ ................................ .............................. 8 other technical information ................................ ................................ ........ e` ! x`
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 2 introduction general product information general description the rt8293a is a high efficiency , monolithic synchronous step - down dc/dc converter that can deliver up to 3a output current from a 4.5v to 23v input supply. the rt8293a's current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. cycle - by - cycle current limit provides protection against shorted outputs and soft - start eliminates input current surge during start - up. the rt8293a also provides output under voltage protection and thermal shutdown protection. the low current (<3a) shutdown mode provides output disconnection, enabling easy power management in battery - powered systems. the rt8293a is available in an sop - 8 (exposed pad) package. features ? 1.5% high accuracy feedback voltage ? 4.5v to 23v input vol tage range ? 3a output current ? integrated n - mosfet switches ? current mode control ? fixed frequency operation : 340khz ? output adjustable from 0.8v to 20v ? up to 95% efficiency ? programmable soft - start ? stable with low - esr ceramic output capacitors ? cycle - by - cycle o ver current protection ? input under voltage lockout ? output under voltage protection ? thermal shutdown protection ? rohs compliant and halogen free
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 3 key performance summary table key features evaluation board number: pcb004_v1 default input voltage 12v max output current 3a default output voltage 3.3v default marking & package type RT8293AHZSP, psop - 8 (exposed pad) operation frequency steady 340khz at all load currents other key features 4.5v to 23v input voltage range programmable soft - start prote ction output under - voltage protection (hiccup mode): cycle - by - cycle current limit thermal shutdown
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 4 bench test setup conditions headers description and placement please carefully inspect the evb ic and external components, comparing them to the follo wing bill of materials, to ensure that all components are installed and undamaged. if any components are missing or damaged during transportation, please contact the distributor or send e - mail to evb_service@ri chtek.com . test points the evb is provided with the test points and pin names listed in the table below. test point/ pin name signal comment (expected waveforms or voltage levels on test points) vin input voltage input voltage range= 4.5v to 23v vout ou tput voltage default output voltage = 3.3v output voltage range= 0.8v to 20v (see output voltage setting section for changing output voltage level) sw switching nod e test point sw waveform en enable test point enable signal. en is automatically pu lled high (by r4) to enable operation. connect en low to disable operation. bs boot strap supply test point floating supply voltage for the high - side n - mosfet switch ss soft - start control test point soft start waveform gnd ground ground
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 5 power - up & measurement procedure 1. apply a 12v nominal input power supply (4.5v < v in < 23v) to the vin and gnd terminals. 2. the en voltage is pulled to logic high by r4 (100k to vin) to enable operation. drive en high (>2.7v) to enable operation or low (<0.4v) to disab le operation. 3. verify the output voltage (approximately 3.3v) between vout and gnd. 4. connect an external load up to 3a to the vout and gnd terminals and verify the output voltage and current. output voltage setting set the output voltage with the resistive divider (r1, r2) between vout and gnd with the midpoint connected to fb. the output is set by the following formula: the installed v out capacitors (c4, c5) are 22 f, 16 v x5r ceramic types. do not exceed their operating voltage range and consider their voltage coefficient (capacitance vs. bias voltage) and ensure that the capacitance is sufficient to maintain stability and provide sufficient transient response for y our application. this can be verified by checking the output transient response as described in the rt8293 ic datasheet. out r1 v = 0.8 x (1 + ) r2
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 6 schematic , bill of materials and board layout evb schematic diagram c1, c2: 10f/50v/x5r, 1206, tdk c3216x5r1h106k c4, c5: 22f/16v /x5r, 1210, murata grm32er61c226k l1: 10h taiyo yuden nr8040t100m, dcr=34m gnd sop-8(exposed pad) u1 bs 1 vin 2 sw 3 gnd 4,9 ss 8 en 7 comp 6 fb 5 l1 10uh c10 0.1uf tp2 ss r4 100k r5 nf c13 nf c1 10uf c2 10uf c4 22uf c8 nf c7 3.3nf c3 0.1uf c5 22uf r1 75k r2 24k r3 13k c6 0.1uf tp1 en c11 0.1uf c9 nf d2 nf d1 nf vout gp3 gp4 gp1 gp2 gnd vin tp3 sw gnd tp4 bs c12 nf
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 7 bill of materials reference qty part number description package manufacture u1 1 rt8293a hzsp dc - dc converter psop - 8 r ichtek c 1, c2 2 c3216x5r1h106k160ab 10uf/10%/50v/x5r cera mic capacitor 1206 tdk c 4, c5 2 grm32er61c226ke20# 22uf/10%/16v/x5r ceramic capacitor 1210 murata c 7 1 0603b3 3 2k500 3. 3 nf/10%/50v/x7r ceramic capacitor 0603 walsin c 3 , c6, c10,c 11 4 c1608x7r1h104k080aa 0.1uf/10%/50v/x7r ceramic capacitor 0603 tdk c8 ,c9,c12,c13 0 not installed 0603 l1 1 nr8040t100m 1 0 uh /3.1a / 2 0% , dcr=34 m , inductor 8mmx8mmx4mm taiyo yuden r1 1 75k / 1% , resistor 0603 r2 1 24 k / 1% , resistor 0603 r3 1 13 k / 1% , resistor 0603 r4 1 100 k / 1% , resistor 0603 r5 0 not installed 0603 d1, d2 0 not installed tp 4 test pin gp 4 golden pin
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 8 evb layout top view (1 st layer) bottom view (2 nd layer)
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 9 component placement guide component side (1 st la yer) pcb layout component side (1 st layer)
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 10 component placement guide bottom side ( 2 nd layer ) pcb layout bottom side ( 2 nd layer)
rt 8293ahzsp evaluation board ug8293ahzsp - 00 march 2014 www.richtek.com 11 more information for more information, please find the related datasheet or application notes from rich t ek website http://www.richtek.com . important notice for richtek evaluation board this document is for reference only, nothing contained in this document shall be construed as richteks warranty, express or implied, under contract, tort or statutory, with respect to the presentation herein. in no event shall richtek be liable to buyer or user for any and all damages including without limitation to direct, indirect, special, punitive or consequential damages.

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