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rt7232 g qw evaluation board ug72 32 gqw - 00 april 2014 www.richtek.com purpose the rt7232 is a high - performance 650 khz 4a step down regulator with an internal power switch and synchronous rectifier . this document explains the function and use of the rt7232 evaluation board (evb) and provides information to enable operatio n 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 ben ch test setup conditions ................................ ................................ ................................ ....... 4 headers description and placement ................................ ................................ ......................... 4 test points ................................ ................................ ................................ ............................... 5 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`
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 2 introduction general product information general description the rt7232 is a high - performance 650 khz 4a step down regulator with an interna l power switch and synchronous rectifier. it features quick transient response using its advanced constant on - time (acot tm ) control architecture that provides stable operation with small ceramic output capacitors and without complicated external compensati on, among other benefits. the input voltage range is from 4.5v to 18v and the output is adjustable from 0.765v to 8v. the proprietary acot tm control improves upon other fast response constant on - time architectures, achieving nearly constant switching frequ ency over line, load, and output voltage ranges. since there is no internal clock, response to transients is nearly instantaneous and inductor current can ramp quickly to maintain output regulation without large bulk output capacitance. the rt7232 is stabl e with and optimized for ceramic output capacitors. with its internal 90m switch and 60m synchronous rectifier, the rt7232 displays excellent efficiency and good behavior across a range of applications, especially for low output voltages and low duty cyc les. cycle - by cycle current limit, input under - voltage lock - out, externally - adjustable soft - start, output under - and overvoltage protection, and thermal shutdown provide safe and smooth operation in all operating conditions. the rt7232 evaluation board use s the rt7232 gqw ic in a wdfn - 10l3x3 package with an exposed thermal pad. the ic is also available in a ptssop - 14 package with an exposed thermal pad. features ? fast transient response ? steady 650 khz switching frequency a t pwm ? 4a output current ? advanced cons tant on - time (acot tm ) control ? optimized for ceramic output capacitors ? 4.5v to 18v input voltage range ? internal 90m? switch and 60m? synchronous rectifier ? 0.765v to 8v adjustable output voltage ? externally - adjustable, pre - biased compatible soft - start ? cycle - b y - cycle current limit ? output over - and under - voltage shut - down
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 3 key performance summary table key features evaluation board number: pcb002_v1 default input voltage 12v max output current 4a default output voltage 1.05v default marking & package type rt 7232 gqw (wdfn - 10l 3x3) operation frequency steady 650 khz at pwm other key features advanced constant on - time(acot tm ) control power good adjustable soft - start (external capacitor) psm/ pwm auto switched protection over current protection: cycle - by - cycle current limit hiccup mode output over - and under - voltage shut - down
rt7232 gqw evaluation board ug72 32gqw - 00 april 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 following 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@richtek.com .
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 5 test points the evb i s 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 18v vout output voltage default output vol tage = 1.05v output voltage range = 0.765v to 8v (see output voltage setting section for changing output voltage level) gnd ground ground reference for the input voltage, output voltage and analog ground sw sw itching nod e test point sw waveform e n enable test point enable signal. drive en or install a shorting block on jumper jp1 to enable operation (shorting 2 - 3) or disable operation (shorting 1 - 2). jp1 chip enable control install jumper or drive en directly to enable or disable operation boot boot strap supply test point floating supply voltage for the high - side n - mosfet switc h ss soft - start control test point soft start waveform pvcc linear regulator output test point internal linear regulator output= 5.1v pg power good output test point c onnected to pvcc through r29, pg voltage is 5.1v when soft - start is complete and the output voltage is in regulation power - up & measurement procedure 1. connect a jumper at jp1 terminals 1 and 2, connecting en to gnd, to disable operation. 2. apply a 12v nomina l input power supply (4.5v < v in < 18v) to the vin and gnd terminals. 3. set the jumper at jp1 to connect terminals 2 and 3, connecting en to vin through resistor r30, to enable operation. 4. verify the output voltage (approximately 1.05v) between vout and gnd. 5. connect an external load up to 4a to the vout and gnd terminals and verify the output voltage and current. output voltage setting set the output voltage with the resistive divider (r23, r28) between vout and gnd with the midpoint at fb. the output is set by the following formula: the installed v out capacitors (c11, c12) 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. installing a small 5pf to 22pf capacitor at c30 (in parallel with r23) may be desirable to improve transient response for higher output v oltages. see the rt7232 ic data sheet for more information. out r23 v = 0.765 x (1 + ) r28
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 6 schematic , bill of materials and board lay out evb schematic diagram c7, c9: 10 f/50v/x5r, 1206, tdk c3216x5r1h106k c11, c12: 22f/16v/x5r, 1210, murata grm32er61c226k l1: 1.4h taiyo yuden nr8040t1r4n, dcr=7m r29 10k tp1 pg tp2 pvcc tp3 en tp4 ss vin tp5 boot l2 nf gnd u5 wdfn-10l 3x3 en 1 fb 2 pvcc 3 ss 4 vin 10 vin 9 boot 8 sw 7 pg 5 sw 6 gnd 11 tp6 sw jp1 en 1 2 3 r30 100k r28 22k r23 8.2k c29 1uf c30 nf l1 1.4uh vout gnd c27 0.1uf gp3 gp2 c7 10uf c8 0.1uf c9 10uf gp4 c10 0.1uf c11 22uf c12 22uf c28 3.9nf gnd cp1 short gp5 gp1 gnd
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 7 bill of materials reference qty part number description package manufacture u5 1 rt7232 gqw dc/dc converter wdfn - 10l 3x3 r ichtek c7,c9 2 c3216x5r1h106k160ab 10 f/10%/50v/x5r 1206 tdk ceramic capacitor c11,c12 2 grm32er61c226ke20# 22 f/10%/16v/x5r 1210 murata ceramic capacitor c28 1 0603b392k500 3.9nf/10%/50v/x7r 0 603 walsin ceramic capacitor c8,c10, c27 3 c1608x7r1h104k080aa 0.1 f/10%/50v/x7r 0 603 tdk ceramic capacitor c29 1 c1608x5r1e105k080ac 1 f/10%/25v/x5r 0 603 tdk ceramic capacitor c30 0 not installed 0 603 l1 1 nr8040t1r4n 1.4 h/7a/30%, dcr=7m, inductor 8mmx8mmx4mm taiyo yud en l 2 0 not installed r28 1 22k /5%, resistor 0 603 r23 1 8.2k /5%, resistor 0 603 r29 1 10k /5%, resistor 0 603 r30 1 100k /5%, resistor 0 603 cp1 1 0 (short) jp1 1 3 - pin header tp1/2/3/4/5/6 6 test pin gp 5 golden pin
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 8 evb la yout top view (1 st la yer) bottom view ( 4 th layer)
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 9 component placement guide component side (1 st la yer) pcb layout component side (1 st layer)
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 10 pcb layout inner side (2 nd layer) pcb layout inner side (3 rd layer)
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 11 component p lacement guide bottom side (4 th layer) pcb layout bottom side (4 th layer)
rt7232 gqw evaluation board ug72 32gqw - 00 april 2014 www.richtek.com 12 more information for more information, please find the related datasheet or application notes from richtek 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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