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april 2010 ? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control fan5340 synchronous constant-current series boost led driver with pwm brightness control and integrated load disconnect features ? synchronous current-mode boost converter ? up to 500mw output power ? supports 2, 3, or 4 leds in series ? 2.7v to 4.8v input voltage range ? 1.2mhz fixed switching frequency ? 1ma maximum quiescent current ? soft-start capability ? input under-voltage lockout (uvlo) ? output over-voltage protection (ovp) ? short-circuit detection ? thermal shutdown (tsd) protection ? 8-lead 3.00 x 3.00mm mlp ? 8-bump 1.57 x 1.57mm wlcsp applications ? cellular phones, smart phones ? pocket pcs ? wlan dc-dc converter modules ? pda, dsc, pmp, and mp3 players description the fan5340 is a synchronous constant-current led driver capable of efficiently delivering up to 500mw to a string of up to four leds in series. optimized for small form-factor applications, the 1.2mhz fixed switching frequency allows the use of chip inductors and capacitors. for safety, the device features integrated short-circuit detection plus over-voltage and thermal shutdown protections. in addition, input under-voltage lockout protection is triggered if the battery voltage is low. brightness (dimming) control is implemented by applying a pwm signal of 300hz to 1khz on the en pin. during shutdown, the fan5340 disconnects the led anodes from the output of the boost regulator, which holds the boost regulator?s voltage on c out , reducing audible noise from the pwm dimming and removing power from the led string. fb 4 3 2 1 5 6 7 8 vled en gnd pgnd sw vout vin c out l1 c in 2 ? 4 leds rset p1 gnd figure 1. typical application ordering information part number operating temperature range package packing FAN5340UCX -40 to 85c 8-bump, 1.57 x 1.57mm wafer level chip-scale package (wlcsp) tape and reel fan5340mpx (prelminary) -40 to 85c 8-lead, 3.00 x 3.00mm molded leadless package (mlp) tape and reel
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 2 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control block diagrams q1 15 - 133 fb vled 2 ? 4 leds vout en vin pgnd sw gnd l1 rset d1 q2 c out cin boost control gate drive q3 figure 2. block diagram table 1. recommended external components component description vendor parameter min. typ. max. units l1 22 h nominal murata lqh3npn220mgok l (1) 22 h dcr (series r) 1100 m c out 4.7 f x5r or better c 4.7 f c in 4.7 f x5r or better c 4.7 f note: 1. minimum l (inductance) incorporates tolerance, temperature, and dc bias effects (l decreases with increasing current).
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 3 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control pin configuration c1 b1 a1 a2 c3 b3 a3 c2 gnd en vled fb vin vout sw pgnd figure 3. wlcsp package, top view c1 b1 a1 c3 b3 a3 a2 c2 figure 4. wlcsp package, bottom view p1 gnd 4 3 2 1 5 6 7 8 vin vout sw pgnd gnd en vled fb figure 5. 8-pin 3 x 3mm mlp, top view pin definitions pin # name description csp mlp a1 1 gnd analog ground . all signals are referenced to this pin. a2 2 en enable / pwm brightness control . a logic low on this pin shuts down the ic, disconnects the leds from vout, and reduces the current consumption of the ic. this terminal has an internal pull-down resistor of 300k ? . a3 3 vled led string output . connected to the anode of a series string of two to four leds. b3 4 fb current feedback . the boost regulator regulates this pi n to 0.5v to control the led string current. tie this pin via a current-setting resistor (r set ) to gnd and the cathode of the led string. c3 5 pgnd power ground . the boost switch and gate drivers are grounded at this pin. c2 6 sw switching node . tie inductor l1 from v in to this pin. c1 7 vout boost output voltage . output of the boost regulator. b1 8 vin input voltage .
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 4 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. units v in vin ?0.3 6.0 v v fb , v en fb, en pins ?0.3 v in + 0.3 v v sw sw pin ?0.3 24.0 v v out vout pin ?0.3 24.0 v esd electrostatic discharge protection level human body model per jesd22-a114 4.0 kv charged device model per jesd22-c101 1.5 t j junction temperature ?40 +150 c t stg storage temperature ?65 +150 c t l lead soldering temperature, 10 seconds +260 c recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. fairchild does not recomm end exceeding them or designing to absolute maximum ratings. symbol parameter min. typ. max. units v in vin supply voltage 2.7 4.8 v v out vout voltage 6.2 16.0 v i out vout load current 5 40 ma f en_pwm en pin pwm dimming frequency 100 300 1000 hz t a ambient temperature ?40 +85 c t j junction temperature ?40 +125 c thermal properties junction-to-ambient thermal resistance is a function of application and board layout. this data is measured with four-layer 2s2p evaluation boards in accordance to jedec standard jesd51. special attention must be paid not to exceed junction temperature t j(max) at a given ambient temperate t a . symbol parameter typ. units ja junction-to-ambient thermal resistance wlcsp package 110 c/w mlp package 49 c/w
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 5 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control electrical specifications v in = 2.7v to 4.8v and t a = -40c to +85c unless otherwise noted. typical values are at t a = 25c and v in = 3.6v. symbol parameter conditions min. typ. max. units power supplies i q quiescent current en = v in , device not switching 1 ma i sd shutdown supply current en = gnd, v in = 3.6v 0.3 1.0 a v uvlo under-voltage lockout v in rising 2.30 2.40 2.50 v v in falling 2.00 2.15 2.25 v v uvhyst under-voltage lockout hysteresis 250 mv en: enable pin v ih high-level input voltage 1.2 v v il low-level input voltage 0.4 v r en en pull-down resistance 200 300 400 k t sd en low to shutdown delay from falling edge of en 20 80 ms feedback and reference v fb feedback voltage 480 500 520 mv i fb feedback input current v fb = 500mv 0.1 1.0 a power outputs r ds(on)_q1 boost switch on-resistance v in = 3.6v, v out = 10v, i sw = 100ma 600 m v in = 2.7v, v out = 10v, i sw = 100ma 850 r ds(on)_q2 synchronous rectifier on-resistance v out = 10v, i sw = 100ma 2.0 r ds(on)_q3 load switch on-resistance v out = 10v, i led = 10ma 2.8 i sw(off) sw node leakage (2) en = 0, v in = v sw = v out = 5.5v, v led = 0 0.1 1.0 a i lim-pk boost switch peak current limit v in = 3.6v 325 400 475 ma oscillator f sw boost regulator switching frequency 1.0 1.2 1.4 mhz pwm dimming d pwm pwm duty cycle (3) pwm dimming frequency 1khz 1.0 100 % output and protection v ovp boost output over-voltage protection 18.0 19.0 20.0 v v ovphyst ovp hysteresis 0.8 v v thsc v led short-circuit detection threshold v out falling v in ? 1.5 v v out rising v in ? 1.3 v d max maximum boost duty cycle (3) 85 % d min minimum boost duty cycle (3) 20 % t sd thermal shutdown 150 c t hys thermal shutdown hysteresis 25 c notes: 2. sw leakage current includes the leakage current of three internal switches; sw to gnd, v out to v led , and sw to v out . 3. guaranteed by design.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 6 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control typical characteristics v in = 3.6v, t a = 25 c, i led = 20ma, l = 22h, c out = 4.7f. figure 6. efficiency vs. led current: two leds figure 7. efficiency vs. led current: three leds figure 8. efficiency vs. led current: four leds figure 9. f sw vs. input voltage vs.temperature figure 10. fb voltage vs. input voltage vs. temperature figure 11. ovp vs. input voltage vs. temperature
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 7 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control typical characteristics (continued) figure 12. pwm linearity over full dimming duty cycle range, four leds figure 13. pwm linearity with dimming duty cycle <2.5%, four leds figure 14. maximum output current at v out figure 15. line transient with 10s line step, four leds figure 16. over-voltage protection: soft-start into open led string
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 8 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control typical characteristics (continued) figure 17. cold-start waveform with 100% duty cycle at 1ms/div. figure 18. cold-start waveform with 100% duty cycle showing startup, shutdown and startup at 10ms/div figure 19. fan5340 i load step from 20ma to 30ma by enabling fan5640 at 10ma, three leds figure 20. fan5340 i load step from 30ma to 20ma by disabling fan5640 at 10ma, three leds
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 9 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control circuit description overview the fan5340 is an inductive current-mode boost serial led driver that achieves led current regulation by maintaining 0.5v across r set . the current through the led string (i led ) is therefore: set led r i 5 . 0 = (1) while the forward-voltage across the leds determines v out , the fan5340?s boost regulator output can also support additional loads on v out (see figure 21) provided its input current limit is not exceeded. figure 21. maximum output current vs. input voltage uvlo and soft-start if en has been low for more than 20ms, the ic initiates a ?cold start? soft-start cycle when en rises, provided v in is above the uvlo threshold. the soft-start circuit ramps the voltage reference to the error amplifier to control inrush current. pwm dimming when en goes low, the ic turns off a mosfet (q3 in figure 2), which disconnects the led load, preventing c out from being discharged when en is low. as long as en is low for less than 20ms, the regulator?s main regulation loop quickly regains control when en returns to a high state. short-circuit detection if v out falls below v in ? 1.5v, q3 turns off and remains off until v out recovers to at least v in ? 1.3v. over-voltage protection if the led string is open circuit, fb remains at 0v and the output voltage continues to increase in the absence of an over-voltage protection (ovp) circuit. the fan5340?s ovp circuit disables the boost regulator when v out exceeds 19.0v and continues to keep the regulator off until v out drops below 18.2v. thermal shutdown if the die temperature exceeds 150c, a reset occurs and remains in effect until the die cools to 125c, at which time the circuit is allowed to begin the soft-start sequence. applications using vout to drive additional led strings the vout pin can be used as a supply for simple current sources (shown in figure 22 using the fan5640) or discrete current sinks. to avoid dragging v out down when the en pin is low, the auxiliary strings should not be enabled unless the en pin is high. the auxiliary strings can therefore be pwm dimmed using either the same line as the en line as shown below or enabled separately, but within the on-time of the fan5340. gnd rset fan5640 1 2 3 6 5 4 iout1 en vin iout2 r1 fan5340 fb 4 3 2 1 5 6 7 8 vled en gnd pgnd sw vout vin c out l1 c in r2 figure 22. driving additional led strings if using vout to drive additional loads, care should be taken not to exceed the input current limit. this limitation is shown in figure 21 for a typical ic. the total load (i out 1 + i out 2 + i led ) should always remain below 70% of the value in figure 21.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 10 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control physical dimensions product-specific dimensions product d e x y fan5340uc 1.570 1.570 0.285 0.285 figure 23. 8-bump, 1.57 x 1.57mm wafer level chip-scale package (wlcsp) package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner wit hout notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to verify or o btain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 11 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control physical dimensions (continued) figure 24. 8-pin, 3 x 3mm molded leadless package (mlp) package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner wit hout notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to verify or o btain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5340 ? rev. 1.0.1 12 fan5340 ? synchronous c onstant-current boost se ries led driver with pwm brightness control

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