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mp3309 2.7v-5.5v input, 35v output white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 1 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the mp3309 is a wled step-up converter for 2.7v-to-5.5v input that uses peak-current mode to regulate the led current sensed through an external, low-side resistor. the 200mv feedback voltage and synchronous rectification reduces power loss and reduces pcb space requirements. for non-synchronous mode, setting an internal register can disable the rectifier mosfet to save driver losses. the mp3309 features a programmable switching frequency to optimize efficiency. it supports both analog and pwm dimming. in addition, the mp3309 has led open protection, cycle-by-cycle current limit protection, under voltage protection and thermal shutdown protection -. the i 2 c interface can set the protection indication bits and over- voltage protection point. features ? 2.7v-to-5.5v input voltage ? analog and pwm dimming ? selectable synchronous or non- synchronous mode ? 400khz i 2 c-compatible interface ? digitally-set led current ? programmable switching frequency ? programmable over voltageprotection point ? low 200mv feedback voltage with 1% ? software- or hardware-enable function ? internal soft start ? uvlo, thermal shutdown, ocp ? available in a 1.4mm 1.8mm qfn-10 package mp3309?default analog dimming (pwmh) by external pwm signal input mp3309c?default i 2 c interface applications ? feature phones and smart phones ? tablets ? <10inchvideo displays a ll mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application typical application circuit
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 2 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. ordering information part numbe r package top marking mp3309gqg * qfn-10 (1.4mm1.8mm) bm MP3309CGQG qfn-10 (1.4mm1.8mm) cj * for tape & reel, add suff ix ?z (e.g. mp3309gqg?z); ** for tape & reel, add suffix ?z (e.g. MP3309CGQG?z); package reference top view qfn-10 (1.4mm1.8mm) absolute maximum ratings (1) v in .................................................. -0.3v to +6v v sw , v out ??????????..?-1v to +40v v bst ........................................ -0.3v to v sw +6v all other pins ................................ ?0.3v to +6v junction temper ature .............................. 150c lead temperat ure ................................... 260c continuous power dissipation (t a = 25c) (2) ................... ................... ........................0.892w recommended operating conditions (3) supply voltage v in ......................... 2.7v to 5.5v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc qfn-10 (1.4mm1.8mm) ..... 140 ...... 30 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 a t 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 permanen t damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 3 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. electrical characteristics v in =3.6v, v en = v in , t a = 25c, unless otherwise noted. parameters symbol condition min typ max units step-up converter operating input voltage v in 2.7 5.5 v supply current (quiescent) i q v in =3.6v, v en = v in , no load with switching 420 a supply current (shutdown) i st v en =0v, v in =3.6v 1 a en bit=0, v in =3.6v 68 a input uvlo threshold v in_uvlo rising edge 2.5 v input uvlo hysteresis 200 mv en high voltage v en_high v en rising 1.2 v en low voltage v en_low v en falling 0.4 v switching frequency f sw r osc = 200k ? 540 640 740 khz maximum duty cycle d max sync mode, 600khz 89 93 % non-sync mode, 600khz 90 95 feedback regulation voltage v ref 198 200 202 mv vref ramp-up time t step 320 s power switch main switch on-resistance r dson_m vin=3.6v 0.3 0.5 ? sync switch on-resistance r dson_s vin=3.6v 0.5 0.8 ? current dimming pwmh input low threshold v pwm_lo v pwm falling 0.4 v pwmh input high threshold v pwm_hi v pwm rising 1.2 v pwml shutdown time t sd en/pwml high to low 20 ms protection ovp voltage v ovp ovp0=0,ovp1=1(defa ult) 33.5 35.5 37.5 v hysteresis 2.5 ovp0=1,ovp1=0 22.5 24 25.5 v hysteresis 2 ovp0=0,ovp1=0 12.5 13.5 14.5 v hysteresis 1 cycle-cycle current limit i lim ovp0=1,ovp1=0 1.5 a startup current limit i lim_start max duty cycle 0.8 a time step for half current limit t lim_half 5 ms
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 4 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. electrical characteristics (continued) v in =3.6v, v en = v in , t a = 25c, unless otherwise noted. parameters symbol condition min typ max units ovp uvlo threshold v ovp_uv 1.24 v thermal shutdown threshold t st 150 c thermal shutdown hysteresis 25 c i 2 c interface specifications input logic low v il 0 0.4 v input logic high v ih 1.3v v output logic low v ol iload=3ma 0.4 v scl clock frequency f scl 400 khz scl high time t high 0.6 s scl low time t low 1.3 s data setup time t su,dat 100 ns data hold time t hd,dat 0 0.9 s setup time for repeated start t su,sta 0.6 s hold time for start t hd,sta 0.6 s bus free time between a start and a stop condition t buf 1.3 s setup time for stop condition t su,sto 0.6 s rise time of scl and sda t r 20+0.1 c b 120 ns fall time of scl and sda t f 20+0.1 c b 120 ns pulse width of suppressed spike t sp 0 50 ns capacitance bus for each bus line c b 400 pf i 2 c compatible interf ace timing diagram
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 5 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. typical performance characteristics v in = 3.6v, 8 leds, iled=20ma, l = 10h, t a = 25c, unless otherwise noted.
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 6 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. pin functions pin # name description 1 sda i 2 c data input. for mp3309, connect the scl(pwmh) and sda(pwmh) pins together as one pwm signal input for analog dimming. >20khz pwm signal is recommended input for analog dimming. 2 vin input supply pin. provides power for internal power and logic circuits. must be locally bypassed. 3 en/pwml pwm brightness control/enable. apply a pwm signal for pwm dimming. the pwm duty is proportional to the led current dimming ?a lower dimming duty results in a smaller dimming current. for most applications, use a frequency range of 200hz to 2khz. a low-level signal longer than 20ms will shutdown the ic. 4 rfeq switching frequency set. connect a resistor between this pin and gnd to program the converter switching frequency. do not leave this pin floating. 5 fb led current feedback. regulates the voltage across the current sense resistor between fb and gnd to 200mv. 6 gnd ground. 7 sw power switch node. drain of the internal low-side mosfet. connect the power inductor between sw and vin pin. for non-synchronous mode, connect a schottky diode between this pin and vout. 8 vout output voltage. internally connected to the source of the synchronous mosfet. for non-synchronous mode, connect a schottky diode between sw pin and this pin. . 9 bst booststrap. connect a capacitor between sw and bst pin to provide the synchronous mosfet gate driver. 10 scl i 2 c interface clock signal. for mp3309 connect the scl and sda pins together as pwm input for analog led dimming. >20khz pwm signal is recommended.
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 7 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. figure 1: functional block diagram
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 8 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. operation the mp3309 uses the peak current mode control architecture to regulate the current flowing through the white leds string. the operation of the mp3309 can be understood by referring to the function block diagram. at the start of each oscillator cycle, the control circuit turns on the low-side mosfet (ls-fet, m1). a stabilizing ramp added to the output of the current-sense amplifier, which then feeds into the positive input of the pwm comparator, prevents sub-harmonic oscillations at duty cycles greater than 50%. when the input to the pwm comparator equals the output voltage of the error amplifier. m1 turns off. then the inductor current flows through the synchronous power mosfet or the external schottky diode, which forces the inductor current to decrease. the voltage at the output of the error amplifier is the amplified difference between the 200mv reference voltage and the feedback voltage. if the feedback voltage starts to drop, the output of the error amplifier increases, increasing the current flowing through the m1, thus increasing the power to the inductor and output power. this method accurately regulates the led current. system startup when enabled, the mp3309 checks safety limits, including uvlo and over-temperature protection (otp), over-current protection after passing the ovp test. if all the protection tests pass, the chip then starts boosting the step-up converter with an internal soft-start. if by software enable,during the soft-start, the reference voltage gradually ramps up with a time step of 320 s for a total of 32 steps. if by hardware enable, during soft-start,the current limit drops to 0.8a during startup to prevent a large inrush current. this low-current-limit time lasts for 5ms after the ic is enabled. synchronous or non-synchronous mode selection in default mode (internal register bit sync=1), the converter works in synchronous mode. synchronous mode can reduce diode power consumption caused by a large voltage drop. this synchronous mode increases the converter efficiency for low led string voltage. this mode does not need an external schottky diode to reduce pcb space requirements and bom costs. in some applications as below, select non- synchronous mode by setting the internal register bit sync=0. be sure to connect an external schottky diode between sw and vout. 1. when the led string voltage is high, the duty cycle is large, which means the synchronous-power-mosfet turn-on time is very short; 2. when the switching frequency is set too high, the synchronous power mosfet driver loss is large. dimming control the mp3309 provides two dimming methods: pwm and analog dimming mode. for pwm dimming, apply a pwm signal to the en/pwml pin. the led current is then segmented as per the pwm signal and the average led current equals: dim set d i .where d dim is the pwm duty cycle, and i set is the led current amplitude. when pwm signal is high, the converter operates in normal mode. conversely, when the pwm amplitude is low, the converter stops switching. make sure that the pwm-signal low-level time is less than 20ms or the ic will shutdown. use a 200hz-to- 2khz pwm-dimming frequency for most dimming ratio requests. for analog dimming, set the led current amplitude through i 2 c interface or an external pwm signal. for mp3309c, control the led current-regulation voltage by setting the dims bit(d0-d4) . for mp3309, implement analog dimming by connecting the scl and sda pin together as the pwmh pin and apply a pwm signal. an internal rc fliter filters the pwm signal. the led current amplitude equals i set d dim , where d dim is the pwm duty cycle and i set is the led current amplitude. use a>20khzpwm signal to improve filtering performance.
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 9 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. table 1: i 2 c reference voltage table fb voltage(mv) d4 d3 d2 d1 d0 0 0 0 0 0 0 0 1 5 0 0 0 0 1 2 8 0 0 0 1 0 3 11 0 0 0 1 1 4 14 0 0 1 0 0 5 17 0 0 1 0 1 6 20 0 0 1 1 0 7 23 0 0 1 1 1 8 26 0 1 0 0 0 9 29 0 1 0 0 1 10 32 0 1 0 1 0 11 35 0 1 0 1 1 12 38 0 1 1 0 0 13 44 0 1 1 0 1 14 50 0 1 1 1 0 15 56 0 1 1 1 1 16 62 1 0 0 0 0 17 68 1 0 0 0 1 18 74 1 0 0 1 0 19 80 1 0 0 1 1 20 86 1 0 1 0 0 21 92 1 0 1 0 1 22 98 1 0 1 1 0 23 104 1 0 1 1 1 24 116 1 1 0 0 0 25 128 1 1 0 0 1 26 140 1 1 0 1 0 27 152 1 1 0 1 1 28 164 1 1 1 0 0 29 176 1 1 1 0 1 30 188 1 1 1 1 0 31 200 1 1 1 1 1 ic enable and shutdown the mp3309 enables the internal band-gap and normal switching if both: 1. the en/pwml pin is high 2. the internal register en bit is set to 1. the mp3309 shuts down the chip if either: 1. the en/pwml pin is low for longer than 20ms, or 2. the internal register en bit is set to 0. note that, if only en bit set to 1, the bandgap of ic is still active. open-string protection the mp3309 monitors the vout pin for open- string protection. if the led string is open, the feedback voltage is lower than the reference voltage. the comp then rises and charges the output capacitor until the vout voltage reaches the protection point, v ovp . select v ovp by setting the internal register bits, ovp0 and ovp1. please refer to the ovp protection section in the ec table to select the ovp point. selecting a lower ovp protection point permits the use of lower-voltage output capacitor to reduce costs. the ic stops switching when v out reaches the ovp threshold, the ic resumes function when v out drops below the threshold. input under-voltage protection when vin exceeds 2.5v, the converter starts to charge the internal reference and provides power to the internal control circuitry. there is uvlo hysteresis, approximately 200mv, as vin falls. the ic shuts down when the input voltage drops below 2.3v. thermal-shutdown protection thermal shutdown prevents the ic from operating at exceedingly high temperatures. when the die temperature exceeds the upper threshold (t st ), the ic shutdowns and resumes normal operation when the die temperature drops below lower threshold. typically, the hysteresis is 25c. fault indicator the mp3309c provides several fault register bits to indicate when different protection conditions occur. the host controller can read these fault indication bits. including led open protection fault, over temperature fault and vuot to gnd fault.
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 10 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. application information selecting the switching frequency the switching frequency of the step-up converter can be programmed from 300khz to 1.2mhz. a resistor on the osc pin sets the internal oscillator frequency for the step-up converter as per the equation below: sw osc 120000 f(khz) r(k) = for instance, if r osc =200k ? , the switching frequency is to 600khz. setting the led current set the led current through the current-setting resistor on the fb pin. ref led fb v(v) i (ma) 1000 r() = for instance, if v ref =200mv, and r fb =10 ? , the led current is 20ma. do not leave the fb pin floating. selecting the input capacitor the input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. the input capacitor impedance at the switching frequency should be less than the input source impedance to prevent the high-frequency switching current from passing through to the input. use ceramic capacitors with x5r or x7r dielectrics for their low esr and small temperature coefficients. for most applications, use a 2.2f-to-10 f ceramic capacitor. selecting the inductor the mp3309 requires an inductor to boost its output voltage. a larger value inductor results in less ripple current, lowering both the peak- inductor current and the stress on the internal n-channel mosfet. however, the larger inductor is physically larger, has a higher series resistance, and a lower saturation current. choose an inductor that does not saturate under the worst-case load conditions. select the minimum inductor value to ensure that the boost converter works in continuous-conduction mode with high efficiency and good emi performance. calculate the required inductance value using the equation: 2 out sw load v d(1d) l 2 f i ? in out v d1 v =? where v in and v out are the input and output voltages, f sw is the switching frequency, i load is the led load current, and is the efficiency. the switching current for peak-current mode. to avoid hitting the current limit, the worst-case inductor peak current should be less than 80% of the current limit, i lim . selecting the output capacitor the output capacitor keeps the output voltage ripple small and ensures feedback loop stability. the output capacitor impedance must be low at the switching frequency. ceramic capacitors with x7r dielectrics are recommended for their low esr characteristics. selection must also account for the capacitance?s dependence on the voltage rating; with a dc bias voltage, the capacitor can lose as much as 50% of its capacitance at its rated voltage rating. leave a sufficient voltage rating margin when select the component. too-low or too-high capacitance will cause loop instability. for most applications, select a capacitor in the range of 0.1f to 1 f. setting the over-voltage protection point v out determines the ovp point for open-string protection. in some cases, an led string failure results in a 0v feedback voltage. the part then continuously boosts the output voltage higher and higher until the output voltage reaches the programmed ovp threshold to trigger open- string protection. select an ovp protection point through the i 2 c interface?about 1.1 to 1.2 times higher than the output voltage for normal operation. an appropriate ovp voltage can also allow for low- voltage output capacitors. mode ovp point ovp0=0,ovp1=1(default) 36v ovp0=1,ovp1=0 24v ovp0=0,ovp1=0 15v
mp3309 2.7v-5.5v input, 35v output, f s -programmable, white led driver with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 11 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. selecting the external schottky diode non-synchronous mode (internal register bit sync=0) requires an external free-wheeling diode between the sw and vout pins. to optimize efficiency, use a high-speed and low- reverse-recovery-current schottky diode. make sure the diode?s average and peak current rating exceeds the output average led current and the peak inductor current. in addition, the diode?s breakdown voltage rating should exceed the maximum voltage across the diode. usually, unexpected high-frequency voltage spikes on the diode occur when the diode turns off. therefore, leave some voltage-rating margin to guarantee normal long-term operation. internal soft start by software enable on, to prevent a large inrush current and provide a smooth startup, the mp3309 has a reference rising/falling slew rate. the time is 320 s per step for a total of 32 steps from 0 to 200mv. by hardware enable on, il current limit drop to half to prevent inrush during startup. i 2 c register i 2 c chip address: the device address for the mp3309 is 0x17. after the start condition, the i 2 c-compatible master sends a seven-bit address followed by an eighth read (read: 1) or write (write: 0) bit. the following byte indicates the register address to/from which the data will be written/read. 0 0 1 0 1 1 1 r/w the i 2 c compatible device address register descriptions: part number register address default/reset value mp3309 0x00 111111xx 0x01 x1101000 mp3309c 0x00 011111xx 0x01 x0101000 000 register descriptions: en d0 d1 d2 d3 d4 x x en: ic enable bit. default=1 for mp3309, default=0 for mp3309c. d0:d4: reference set bits. default=11111. x: reserved bits. 001 register descriptions: x dims sync ovp0 opv1 vos ledo otp x: reserved bits. dims: dimming mode select. connect sck and sda together and apply a pwm signal to this pin if setting this bit to 1. use the i 2 c to write to d0 through d4 directly if setting this pin to 0. default=1 for mp3309, default=0 for mp3309c. sync: synchronous mode select. 1: synchronous, 0: non-synchronous. ovp0:ovp1: ovp protection point set. default=01. vos: vout short to gnd fault. read only. default=0. ledo: led open-protection fault. read only. default=0. otp: over temperature protection fault. read only. default=0 layout considerations careful attention must be paid to the pcb board layout and components placement. proper layout of the high frequency switching path is critical to prevent noise and limit electromagnetic interference. the loop consisting of mp3309?s internal low-side mosfet, synchronous mosfet or diode, and output capacitor contains a high-frequency ripple current?minimize this loop. place the input and output capacitor should as to the ic as possible.
mp3309 2.7v-5.5v input, 38v output, f s -programmable, white led controller with i 2 c interface mp3309 rev. 1.01 www.monolithicpower.com 12 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. typical application circuits figure 2: typical application for single string 8leds figure 3: typical application for 3x3 led array
mps confidential do n o t distri b ute mp3309 2.7v-5.5v input, 38v output, f s -programmable, white led controller with i 2 c interface notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp3309 rev. 1.01 www.monolithicpower.com 13 5/14/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. package information qfn-10 (1.4mmx1.8mm)

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