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rt6158h ? ds6158h-00 march 2017 www.richtek.com 1 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. high efficiency, low quiescent, 3a buck-boost converter applications ? ? ? ? ? cellular telephones ? ? ? ? ? rf power amplifiers ? ? ? ? ? tablet pc ? ? ? ? ? portable instrument ordering information note : richtek products are : ? rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ? suitable for use in snpb or pb-free soldering processes. general description the rt6158h converter is a high efficiency single inductor converter which can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 3a. the maximum peak current in the switches is limited to a typical value of 6.5a. feedback loop is internally compensated for both buck and boost operation and it provides seamless transition between buck and boost modes and optimal transient response. the buck-boost operates at 1.5mhz typical switching frequency in full synchronous operation. the rt6158h operates in pulse frequency modulation (pfm) mode for increasing efficiency during low power rf transmission modes. the pfm mode can be disabled, forcing the rt6158h to operate at a fixed switching frequency operation at 2mhz. the rt6158h can also be synchronized with external frequency from 2.2mhz to 2.6mhz. the rt6158h output voltage is programmable using an external resistor divider; the output voltage range is from 2.1v to 5.2v. features ? ? ? ? ? input voltage range : 2.5v to 5.5v ? ? ? ? ? adjustable output voltage : 2.1v to 5.2v by external divided resistors ? ? ? ? ? up to 3a maximum load capability for v in = 3v, v out = 3.5v ? ? ? ? ? up to 96% efficiency ? ? ? ? ? ocp, ovp, otp protected function ? ? ? ? ? 2mhz switching frequency ? ? ? ? ? 5 a non-switching low quiescent maximizes light load efficiency ? ? ? ? ? forced pwm and automatic pfm/pwm mode selection ? ? ? ? ? output fast discharge function ? ? ? ? ? automatic / seamless step up and step down mode transitions ? ? ? ? ? 25-ball wl-csp package marking information 0k : product code ymdnn : date code pin configuration (top view) wl-csp-25b 2.07x2.33 (bsc) avin pvin pvin pvin lx1 en lx1 lx1 pgnd pgnd pgnd agnd lx2 lx2 agnd lx2 vout vout fb vout pvin lx1 mode lx2 vout e1 a1 b1 c1 d1 e2 a2 b2 c2 d2 e3 a3 b3 c3 d3 e4 a4 b4 c4 d4 e5 a5 b5 c5 d5 rt6158h package type wsc : wl-csp-25b 2.07x2.33 (bsc) 0k ym dnn
rt6158h 2 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit functional pin description pin no. pin name pin function a1, a2, a3, a4 pvin power input supply. a5 avin analog input supply. b1, b2, b3, b4 lx1 phase 1. switching node 1. connect to inductor. b5 en chip enable. this input must not be left floating and must be terminated. c1, c2, c3 pgnd power ground. c4 mode high for pfm mode, low for fccm mode. this pin also can be used to synchronous switching frequency with 2.2mhz to 2.6mhz. this input must not be left floating and must be terminated. c5, d5 agnd analog ground. d1, d2, d3, d4 lx2 phase 2. switching node 2. connect to inductor. e1, e2, e3, e4 vout output power. e5 fb voltage feedback. bom list reference description manufacturer package parameter typ unit c in 10 ? f/6.3v/x5r murata ? grj155r60j106me11d 0402 c 10 ? f c out 22 ? f/6.3v/x5r murata ? grm188r60j226me15d 0603 c 22 ? f c ff 56pf/50v/x5r murata ? grm0335c1h560ja01d 0201 c 56 pf l1 1 ? h, 20% dfe252010f ? 1r0m = p02 2520 l 1 ? h dcr (series r) 48 m ? pull high voltage (for pfm operation) r2 r1 vout agnd v in 2.5v to 5.5v pvin c in1 10f x 2 rt6158h l1 1h lx2 v out 2.1v to 5.2v en pgnd lx1 avin mode fb a1, a2, a3, a4 a5 b5 c4 b1, b2, b3, b4 c1, c2, c3 c5, d5 d1, d2, d3, d4 e1, e2, e3, e4 e5 100k c ff c out 22f x 2 1m 294k 56pf
rt6158h 3 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional block diagram gate drv vout agnd pwm control v ref digital control lx2 pgnd pvin uvlo ocp fb en lx1 mode rd dis avin ovp otp osc dis scp + - amp a b c d operation the rt6158h is a synchronous current mode constant on/off time (cmcot) switching buck-boost converter designed to an adjustable output voltage from an input supply that can be above, equal, or below the output voltage. the inductor current is regulated by a fast current regulator which is controlled by a voltage control loop. the voltage error amplifier gets its feedback input from the fb pin. the output voltage of the rt6158h is adjustable, and can be set by the external divider resistor value. when vin is greater than vout, the device operates in buck mode. when vin is lower than vout, the device operates in boost mode. when vin is close to vout, the rt6158h automatically enters buck or boost mode. in that case, the converter will maintain the regulation for output voltage and keep a minimum current ripple in the inductor to guarantee good performance.
rt6158h 4 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics (v in = 3.6v, t a = 25 c, unless otherwise specified) absolute maximum ratings (note 1) ? supply input voltage ---------------------------------------------------------------------------------------------------- ? 0.3v to 6v ? lx1, lx2 ------------------------------------------------------------------------------------------------------------------- ? 0.3v to 6v < 20ns ---------------------------------------------------------------------------------------------------------------------- ? 3v to 8.5v ? other pins ----------------------------------------------------------------------------------------------------------------- ? 0.3v to 6v ? power dissipation, p d @ t a = 25 c wl-csp-25b 2.07x2.33 (bsc) --------------------------------------------------------------------------------------- 2.8w ? package thermal resistance (note 2) wl-csp-25b 2.07x2.33 (bsc), ja --------------------------------------------------------------------------------- 35.7 c/w ? lead temperature (soldering, 10 sec.) ----------------------------------------------------------------------------- 260 c ? junction temperature --------------------------------------------------------------------------------------------------- 150 c ? storage temperature range ------------------------------------------------------------------------------------------- ? 65 c to 150 c ? esd susceptibility (note 3) hbm (human body model) -------------------------------------------------------------------------------------------- 2kv recommended operating conditions (note 4) ? supply input voltage ---------------------------------------------------------------------------------------------------- 2.5v t o 5.5v ? junction temperature range ------------------------------------------------------------------------------------------ ? 40 c to 125 c ? ambient temperature range ------------------------------------------------------------------------------------------ ? 40 c to 85 c parameter symbol test conditions min typ max unit input power source input voltage range 2.5 -- 5.5 v logic input high threshold v ih 1.2 -- -- v logic input low threshold v il -- -- 0.4 v under-voltage lockout v uvlo 2.05 -- 2.25 v under-voltage lockout hysteresis v uvlo_h -- 0.1 -- v shutdown current i shdn v in = 3.5v, en = l -- -- 1 ? a input quiescent current i qvin non-switching. v in = 4.2v, v out = 3.5v, en = vin, mode = vin -- 5 7 ? a switching quiescent current i qsw i load = 0a. v in = 4.2v, v out = 3.5v, en = vin, mode = vin -- 8 10 ? a switching frequency f sw cot mode = h, |v in - v out | > 1v -- 2 -- mhz switching frequency f swccm mode = l -- 2 -- mhz synchronous switching frequency range f sw sync mode = square wave, 10% < duty < 90% 2.2 -- 2.6 mhz ?
rt6158h 5 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. note 1. stresses beyond those listed ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions may affect device reliability. note 2. ja is measured under natural convection (still air) at t a = 25 c with the component mounted on a high effective- thermal-conductivity four-layer test board on a jedec 51-7 thermal measurement standard. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions. parameter symbol test conditions min typ max unit soft-start time t ss_en time from en goes h to vout starts ramp up -- 1 -- ms t ss v in = 4v, v out = 3.5v, i load = 200ma -- 1 -- ms t ss v in = 2.5v, v out = 3.5v, i load = 200ma -- 2 -- ms minimum off time t off_min -- 40 -- ns minimum on time t on_min -- 40 -- ns fb voltage ccm operation 0.792 0.8 0.808 v high side switch r ds(on) r ds(on)_a, d v out = 5v 12 20 30 m ? low side switch r ds(on) r ds(on)_b, c v out = 5v 12 20 30 m ? output over-voltage protection v ovp 5.3 5.6 5.9 v load current threshold, pfm to pwm i th_pwm v in = 3.6v, v out = 3.3v -- 200 -- ma load current threshold, pwm to pfm i th_pfm v in = 3.6v, v out = 3.3v -- 200 -- ma fault time t fault -- 40 -- ms thermal shutdown -- 160 -- c over-temperature protection hysteresis t otp_hys -- 20 -- c inductor peak current limit i cl 6 6.5 7 a line regulation v in = 2.5v to 5.5v, v out = 3.5v, ccm, i load = 1.5a -- 0.6 -- % load regulation v in = 2.5v to 5.5v, v out = 3.5v, ccm operation, i load < 3a -- 0.6 -- % output voltage ripple v outp-to-p v in = 2.5v to 5.5v, i load > 1a -- 20 -- mv line transient v outp-to-p v in = 3v to 3.6v at 10 ? s, v out = 3.5v, i load = 1a -- 100 -- mv load transient v in = 3.4v, v out = 3.5v, loading = 0.5a to 1a at 1 ? s -- 60 -- mv
rt6158h 6 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. efficiency 40 55 70 85 100 0.00001 0.0001 0.001 0.01 0.1 1 10 load current (a) efficiency (%) typical operating characteristics load regulation -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 1000 10000 output current (ma) regulation (%) line regulation 3.50v 3.52v 3.54v 3.56v 3.58v 3.60v 3.62v 3.64v 2.53.03.54.04.55.05.5 input voltage (v) outputvoltage (v) v out = 3.5v v out = 3.5v v out = 3.5v v in = 4.2v v in = 3.8v v in = 3.5v v in = 3.0v 4.2v 3.8v 3.5v 3.0v 0.1a 0.5a 1.5a 3.0a 0.0a load transient time (75 s/div) v out ripple voltage time (4ms/div) v out (50mv/div) v in = 3v, v out = 3.5v, i out = 0a to 3a x = iout, y = vout (50mv/div) v out ripple voltage time (4ms/div) v in = 4.5v, v out = 3.5v, i out = 0a to 3a v in = 3.6v, v out = 3.5v, t r = t f = 1 s, i out = 0a to 3a lx1 (4v/div) lx2 (5v/div) i out (500ma/div) v out (50mv/div) lx1 (4v/div) x = iout, y = vout (50mv/div) lx2 (5v/div) i out (500ma/div) v out (430mv/div) i out (1a/div)
rt6158h 7 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. switching quiescent current 5 6 7 8 9 10 3.6 4.0 4.4 4.8 5.2 5.6 input voltage (v) quiescent ( a) maximum output current 2.6 2.9 3.2 3.5 3.8 4.1 4.4 2.83.03.23.43.63.84.04.2 input voltage (v) maximum output ccrrent (a ) v out = 3.5v v out = 3.5v shutdown current 0.0 0.2 0.4 0.6 0.8 1.0 2.53.03.54.04.55.05.5 input voltage (v) quiescent ( a) v out = 3.5v, en = 0 tc = 85 c tc = 25 c tc = ? 40 c ) line transient time (200 s/div) power off time (40 s/div) power on time (200 s/div) v in = 3v to 3.6v, v out = 3.5v, i out = 1a v in = 3.6v, v out = 3.5v, i out = 3a v in = 3.6v, v out = 3.5v, i out = 3a v out (50mv/div) v in (500mv/div) v out (1v/div) v en (2v/div) i lx (1v/div) v out (1v/div) v en (2v/div) i lx (1v/div)
rt6158h 8 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. application information the rt6158h buck-boost dc-dc converter can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 3a. the maximum peak current in the switches is limited to a typical value of 6.5a. the typical operating input voltage is between 2.5v and 5.5v. the rt6158h output voltage can be set from 2.1v to 5.2v by changing the external divider resistor on the fb pin. the converter feedback loop is internally compensated for both buck and boost operation and it provides seamless transition between buck and boost modes operation. enable the device can be enabled or by the en pin. when the en pin is higher than the threshold of logic high, the device starts operation with soft-start. once the en pin is set at low, the device will be shut down. in shutdown mode, the converter stops switching, internal control circuitry is turned off, and the load is disconnected from the input. this also means that the output voltage can drop below the input voltage during shutdown. this input must not be left floating and must be terminated. output voltage setting the rt6158h output voltage can be set from 2.1v to 5.2v by changing the external divider resistor on the fb pin. the resistor divider must be connected between vout, fb and gnd. the typical value of the voltage at the fb pin is 800mv. for decrease the leakage current on fb pin, it is recommended to keep the resistor r2 large value. for example, it can be r1 = 1m and r2 = 294k for v out = 3.5v application, the following equation is as below : out fb v r1 = r2 1 v ?? ?? ?? ?? mode states and synchronization the mode pin can be used to select different operation modes. when mode is set high, it means the rt6158h will operate at pfm mode for used to improve efficiency. at this point the converter operates with reduced switching frequency and with a minimum quiescent current to maintain high efficiency. when the load increases, the device will automatically switch to pwm mode. the pfm mode can be disabled by programming the mode pin low. connecting a clock signal at mode pin can force the rt6158h switching frequency to synchronize to the connected clock frequency. the mode pin input supports standard logic thresholds and the frequency range is between 2.2mhz to 2.6mhz. this input must not be left floating and must be terminated. under-voltage lockout the under-voltage lockout circuit prevents the device from operating incorrectly at low input voltages. it prevents the converter from turning on the power switches under undefined conditions and prevents the battery from deep discharge. vin voltage must be greater than 2.5v to enable the converter. during operation, if vin voltage drops below 1.8v, the converter is disabled until the supply exceeds the uvlo rising threshold. the rt6158h automatically restarts if the input voltage recovers to the input voltage uvlo high level. short circuit protection when the output is shorted to ground, the inductor current decays very slowly rate during a single switching cycle. a current runaway detector is used to monitor inductor current. as current increasing beyond the control of current loop, switching cycles will be skipped to prevent current runaway form occurring. over-temperature protection the device has a built-in temperature sensor which monitors the internal junction temperature. if the temperature exceeds a threshold, the device stops operating. as soon as the ic temperature decreases below the threshold with a hysteresis, it starts operating again. over-voltage protection when the vouts pin is floating, the device will trigger the over-voltage protection to avoid the output voltage exceeding critical values for device. in case it reaches the ovp threshold, the device will regulate the output voltage to this value.
rt6158h 9 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. protection type threshold refer to electrical spec. protection method shut down delay time reset method ocp i l > 6.5a turn on b, d mos cl will trigger right away. i l < 6.5a uvp v in < 1.9v shutdown 100 ? s v in > 2.3v otp temp > 160c shutdown no delay otp hysteresis = 20c output ovp v out > 5.6v stop switching no delay v out < 5.3v scp v out < 1.2v f sw become 1/4 no delay after fault 40ms ? inductor selection the recommended power inductor is 1 h with over 6.5a saturation current rating. in applications, need to select an inductor with the low dcr to provide good performance and efficiency. input and output capacitor selection the input and output capacitors should be ceramic x5r type with low esl and esr. the recommended input capacitor value is 2 x 10 f. the recommended output capacitor value is 2 x 22 f. the output capacitor selection determines the output voltage ripple and transient response. it is recommended to use ceramic capacitors placed as close as possible to the vout and gnd pins of the ic. if, for any reason, the application requires the use of large capacitors which cannot be placed close to the ic, using a small ceramic capacitor in parallel to the large one is recommended. this small capacitor should be placed as close as possible to the vout and gnd pins of the ic. the output voltage ripple for a given output capacitor is expressed as follows: if the rt6158h operates in buck mode, the worst-case voltage ripple occurs at the highest input voltage. when the buck-boost operates in boost mode, the worst-case voltage ripple occurs at the lowest input voltage. the maximum voltage of overshoot or undershoot, is inversely proportional to the value of the output capacitor. for surface mount applications, taiyo yuden or tdk ceramic capacitors, x7r series multi-layer ceramic capacitor is recommended. a capacitor with a value in the range of the calculated minimum should be used. this is required to maintain control loop stability. there are no additional requirements regarding minimum esr. low esr capacitors should be used to minimize output voltage ripple. larger capacitors will cause lower output voltage ripple as well as lower output voltage drop during load transients. thermal considerations the junction temperature should never exceed the absolute maximum junction temperature t j(max) , listed under absolute maximum ratings, to avoid permanent damage to the device. the maximum allowable power dissipation depends on the thermal resistance of the ic package, the pcb layout, the rate of surrounding airflow, and the difference between the junction and ambient temperatures. the maximum power dissipation can be calculated using the following formula : p d(max) = (t j(max) ? t a ) / ja where t j(max) is the maximum junction temperature, t a is the ambient temperature, and ja is the junction-to-ambient thermal resistance. for continuous operation, the maximum operating junction temperature indicated under recommended operating conditions is 125 c. the junction-to-ambient thermal resistance, ja , is highly package dependent. for a wl- csp-25b 2.07x2.33 (bsc) package, the thermal resistance, ja , is 35.7 c/w on a standard jedec 51-7 high effective-thermal-conductivity four-layer test board. the maximum power dissipation at t a = 25 c can be calculated as below : p d(max) = (125 c ? 25 c) / (35.7 c/w) = 2.8w for a wl- csp-25b 2.07x2.33 (bsc) package. the maximum power dissipation depends on the operating ambient temperature for the fixed t j(max) and the thermal resistance, ja . the derating curves in figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation.
rt6158h 10 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. layout considerations some pcb layout guidelines for optimal performance of the rt6158h list as following. following figure shows the real pcb layout considerations and it is based on the real component size whose unit is millimeter (mm). ? the input capacitor should be placed as closed as possible to pvin pin for good filtering. ? the high current path should be made as short and wide as possible. ? the inductor should be placed as close to lx1 and lx2 pin for reducing emi. ? the output capacitor should be placed as closed as pgnd pin to ground plane to reduce noise coupling. figure 2. pcb layout guide figure 1. derating curve of maximum power dissipation 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 0 255075100125 ambient temperature (c) maximum power dissipation (w) 1 four-layer pcb pvin lx1 pgnd lx2 vout pvin pvin lx1 lx1 pgnd pgnd lx2 lx2 vout vout pvin avin lx1 en mode agnd lx2 agnd vout fb 0201r 0201r top layer inner layer1 inner layer2 bottom layer vout vin 0603c 2520l 0402c 0402c 0603c
rt6158h 11 ds6158h-00 march 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. outline dimension 25b wl-csp 2.07x2.33 package (bsc) min max min max a 0.500 0.600 0.020 0.024 a1 0.170 0.230 0.007 0.009 b 0.240 0.300 0.009 0.012 d 2.280 2.380 0.090 0.094 d1 e 2.020 2.120 0.080 0.083 e1 e 1.600 0.063 0.400 0.016 symbol dimensions in millimeters dimensions in inches 1.600 0.063
rt6158h 12 ds6158h-00 march 2017 www.richtek.com richtek technology corporation 14f, no. 8, tai yuen 1 st street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 richtek products are sold by description only. richtek reserves the right to change the circuitry and/or specifications without notice at any time. customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. richtek cannot assume responsibility for use of any circuitry other than ci rcuitry entirely embodied in a richtek product. information furnish ed by richtek is believed to be accurate and reliable. however, no respon sibility is assumed by richtek or its subsidiaries for its use; nor for any infringeme nts of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of r ichtek or its subsidiaries. footprint information eab nsmd 0.240 0.340 smd 0.270 0.240 tolerance footprint dimension (mm) package number of pin ty pe 0.025 0.400 wl-csp2.07*2.33-25(bsc) 25

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