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august 2010 ? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 fan5701 ? compact 6 - led driver for mobile platforms fan5701 ? compact 6-led driver for mobile platforms features ? six (6) parallel leds (up to 30ma each) ? total package load current capability: 180ma ? two default groups of four (4) and two (2) leds for main and sub-display lighting with individual pwm dimming controls that operate up to 20khz ? >600:1 dimming ratio for 100hz pwm frequency ? up to 92% efficiency ? built-in 1.5x charge pump with low-dropout bypass switch ? wide input range: 2.7v to 5.5v ? v out over-voltage and short-circuit protection ? over-temperature protection ? 1.2mhz switching frequency for small-sized capacitors ? 16-bump 1.61mm x 1.61mm wlcsp (0.6mm height) ? 16-lead 3.0mm x 3.0mm umlp (0.55mm height) applications ? lcd backlighting ? keypad backlighting ? mobile handsets ? portable media player description the fan5701 is a highly integrated and efficient charge- pump-based multi-led driver. the device can drive up to six leds in parallel with a total output current of 180ma. the fan5701 is capable of driving a primary display backlight requiring four to six leds. when more than four leds are needed for backlighting, the fan5701?s two pwm dimming inputs can be connected together to provide the proper dimming control for all six leds. when a primary and sub-display is needed, the fan5701 can be controlled such that each group can be dimmed independently. for candy- bar phones requiring a primary display and keypad lighting, the fan5701 offers a simple, and compact lighting solution. regulated internal current sinks deliver excellent current and brightness matching to all six leds. the device provides excellent efficiency without an inductor by operating the charge pump in 1.5x or pass-through modes. the fan5701 can be ordered with i set values of 30ma, 20ma, 15ma, or 8ma and available in wlcsp or ultra-thin umlp package types. the default i set is always determined by the part number purchased (see ordering information) . ordering information part number led current (i set ) temperature range package packing fan5701uc30x 30ma -40c to 85c wlcsp-16, 0.4mm pitch tape and reel fan5701uc20x 20ma -40c to 85c wlcsp-16, 0.4mm pitch tape and reel fan5701uc15x 15ma -40c to 85c wlcsp-16, 0.4mm pitch tape and reel fan5701uc08x 8ma -40c to 85c wlcsp-16, 0.4mm pitch tape and reel fan5701ump30x 30ma -40c to 85c umlp- 16, 3.0 x 3.0 x 0.55mm tape and reel fan5701ump20x 20ma -40c to 85c umlp-16, 3.0 x 3.0 x 0.55mm tape and reel fan5701ump15x 15ma -40c to 85c umlp- 16, 3.0 x 3.0 x 0.55mm tape and reel FAN5701UMP08X 8ma -40c to 85c umlp- 16, 3.0 x 3.0 x 0.55mm tape and reel
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 2 fan5701 ? compact 6 - led driver for mobile platforms block diagram current sinks vin c1+ c1? 1 f c2+ c2? pwmb pwma en logic and control gnd charge pump d6b d5b d4a d3a d2a d1a group a g r o u p b 1 f 1 f vout 1 f c out figure 1. typical application
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 3 fan5701 ? compact 6 - led driver for mobile platforms wlcsp pin configuration bumps facing down bumps facing up figure 2. wlcsp-16, 0.4mm pitch, 1.61mm x 1.61mm pin definitions pin # name description d2 vin input voltage . connect to 2.7 ? 5.5v dc input power source. b4 gnd ground d1 vout charge pump output voltage . connect to led anodes. d3,d4 c1+, c1? c1 . charge pump flying capacitor #1. c3,c4 c2+, c2? c2 . charge pump flying capacitor #2. a1, a2, b1, b2, c1, c2 d2a, d1a, d4a, d3a, d6b, d5b led outputs a4 en enable . when this pin is high, normal operation is enabled. when low, the ic is reset and all functions are disabled. b3 pwma group-a pwm dimming input a3 pwmb group-b pwm dimming input
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 4 fan5701 ? compact 6 - led driver for mobile platforms umlp pin configuration figure 3. umlp-16, 0.5mm pitch, 3mm x 3mm (bottom view) pin definitions pin # name description 11 vin input voltage . connect to 2.7 ? 5.5v dc input power source. 6 gnd ground 12 vout charge pump output voltage . connect to led anodes. 10,9 c1+, c1? c1 . charge pump flying capacitor #1. 8,7 c2+, c2? c2 . charge pump flying capacitor #2. 1 ,2, 15, 16, 13, 14 d2a, d1a, d4a, d3a, d6b, d5b led inputs 4 en enable . when this pin is high, normal operation is enabled. when low, the ic is reset and all functions are disabled. 5 pwma group-a pwm dimming input 3 pwmb group-b pwm dimming input
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 5 fan5701 ? compact 6 - led driver for mobile platforms 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 cc vin, vout pins ?0.3 6.0 v other pins (1) ?0.3 av in + 0.3 v esd electrostatic discharge protection level human body model, jesd22-a114 3 kv charged device model, jesd22-c101 umlp16 2 charged device model, jesd22-c101 wlcsp-16 1 t j junction temperature ?40 +150 c t stg storage temperature ?65 +150 c t l lead soldering temperature, 10 seconds +260 c note: 1. lesser of v in + 0.3 or 6.0v. 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 recommend exceeding them or designing to absolute maximum ratings. symbol parameter min. max. units v in supply voltage 2.7 5.5 v v led led forward voltage 2 4 v t a ambient temperature ?40 +85 c t j junction temperature ?40 +125 c thermal properties symbol parameter min. typ. max. units ja junction-to-ambient thermal resistance (2) wlcsp 80 c/w umlp 49 c/w note: 2. junction-to-ambient thermal resistance is a function of application and board layout. this data is measured with four-layer 2s2p boards in accordance to jesd51- jedec standard. special attention must be paid not to exceed junction temperature t j(max) at a given ambient temperate t a .
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 6 fan5701 ? compact 6 - led driver for mobile platforms electrical specifications unless otherwise specified; v in = 2.7v to 5.5v, t a = -40 c to +85 c, and en = v in . typical values are v in = 3.6v, t a = 25 c, i led = 20ma, and led cathode terminals = 0.4v. circuit and components are according to figure 1. symbol parameter conditions min. typ. max. units power supplies and thermal protection i q quiescent supply current 1.5x mode, no leds 4.4 ma 1x mode, no leds 0.7 ma i sd shutdown supply current en = 0, v in = 4.5v, t a =-40 c to +85 c 1.5 4.0 a v uvlo under-voltage lockout threshold v in rising 2.55 2.70 v v in falling 2.20 2.40 v uvhyst under-voltage lockout hysteresis 150 mv ovp over-voltage protection 6 v t limit thermal shutdown 150 c t hyst thermal shutdown hysteresis 20 c led current sinks i led absolute current accuracy v cathode =0.4v, see options for i set ?10% i set +10% ma i led(max) maximum diode current (3) i led = i set 30 ma i led_match led current matching (4) v cathode =0.4v, i led = i set 0.4 3.0 % v dth 1x to 1.5x gain transition threshold led cathode voltage falling 100 mv v hr current sink headroom (5) i led = 90% i led(nominal) 65 mv charge pump r out output resistance 1.5x mode 2.4 ? 1x mode 0.9 ? f sw switching frequency 0.9 1.2 1.5 mhz t start startup time v out = 90% of steady state 250 s pwm dimming f pwm pwm dimming frequency t on_led = 15s (minimum) 20 khz d pwm pwm duty-cycle f pwm = 100hz 0.15 100.00 % logic inputs (en, pwma, pwmb) v ih high-level input voltage 1.2 v v il low-level input voltage 0.4 v v imax maximum input voltage 1.8 5.5 v i in input bias current input tied to gnd or v in 0.01 1.00 a notes: 3. the maximum total output current for the ic should be limited to 180ma. the total output current can be split between the two groups (idxa = idxb = 30ma maximum). under maximum output current conditions, special attention must be given to input voltage and led forward voltage to ensure proper current regulation. see the maximum output current section of the datasheet for more information . 4. for the two groups of current sinks on a part (groupa and groupb), the following are determined: the maximum sink current in the group (max), the minimum sink current in the group (min), and the average sink current of the group (avg). for each group, two matching numbers are calculated: (max-avg)/ avg and (avg-min)/avg. the largest number of the two (worst case) is considered the matching figure for the group. the matching figure for a given part is considered to be the highest matching figure of the two groups. the typical specification provided is the most likely norm of the matching figure for all parts. 5. for each dxx pin, headroom voltage is the voltage across the internal current sink connected to that pin. v hrx = v out - v led . if headroom voltage requirement is not met, led current regulation is compromised.
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 7 fan5701 ? compact 6 - led driver for mobile platforms typical characteristics v in = 3.6v, t a = 25 c, i led = 20ma, and led cathode terminals = 0.4v. figure 4. efficienc y with led current of 8ma and 20ma figure 5. led current match for all six led channels at i led =20ma figure 6. led current v ariation vs. temperature figure 7. s hutdown current vs. input voltage figure 8. switching freq uency vs. temperature with led current of 20ma figure 9. pwm dimming v in =3.6v, i ledx =20ma, en=1khz with 20% duty cycle
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 8 fan5701 ? compact 6 - led driver for mobile platforms typical characteristics (continued) v in = 3.6v, t a = 25 c, i led = 20ma, and led cathode terminals = 0.4v. figure 10. mode transition from 1x to 1.5x mode, v in =3.6v (v cathode ramp up) figure 11. mode transition from 1.5x to 1x mode, v in =3.6v (v cathode ramp down) figure 12. line transient response in 1x mode, v in =3.6v ? 4.2v, i ledx =20ma figure 13. line transient response in 1.5x mode, v in =2.7v ? 3.3v, i led =20ma figure 14. line transient from 1x to 1.5x mode, v in =3.2v ? 4.1v, i ledx =20ma figure 15. soft-start with en, v in =3.6v, i ledx =20m a
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 9 fan5701 ? compact 6 - led driver for mobile platforms circuit description the fan5701 is a white led driver system based upon an adaptive 1.5x/1x charge pump capable of supplying up to 180ma of total output current. the tightly matched current sinks ensure uniform brightness across the leds. each led is configured in a common anode configuration with its peak drive current set during manufacturing ( see ordering information and i set ). charge pump the charge pump operates in either 1x mode, where vout is connected to vin through a bypass switch, or in 1.5x mode. the circuit operates in 1x mode until the led with the highest forward voltage (v led(max) ) can no longer maintain current regulation. at that point, 1.5x mode begins. if the lowest active cathode voltage is greater than 1.8v, the charge pump switches back to 1x mode. in addition to hysteresis, a 1ms transition delay is provided for the device to ignore short-duration input voltage drops in deciding mode transitions. ic enable when the en pin is low, all circuit functions are disabled. when the en pin high, the entire chip is enabled. both pwm inputs are now functional. pwm dimming external pwm inputs (group a and group b) directly modulate output currents in their corresponding led channels to vary the perceived led brightness. two pwm inputs are provided to control two independent groups of leds, such as that of a main display panel and a secondary panel. they can also be connected to a single input to simultaneously dim all six led outputs. v out short-circuit protection the fan5701 has integrated protection circuitry to prevent the device from being short circuited when the output voltage falls below 2v. if this occurs fan5701 turns off the charge pump and the led driver outputs, but a small bypass switch is left on. the device monitors the output voltage to determine if it is still in short circuit condition and, once it has passed, fan5701 soft-starts and returns to normal operation. v out over-voltage protection if the output voltage goes above 6v, the fan5701 shuts down until this condition has passed. the charge pump and led driver outputs are turned off. once this condition has passed, fan5701 soft-starts into normal operation.
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 10 fan5701 ? compact 6 - led driver for mobile platforms physical dimensions bottom view side views top view recommended land pattern ball a1 index area 1 2 3 4 a b c d seating plane 16x a1 0.005 cab f (nsmd pad type) ?0.2600.02 0.40 0.40 (x) 0.018 (y) 0.018 0.625 0.547 0.06 c 0.05 c e d f 0.3780.018 0.2080.021 notes: a. no jedec registration applies. b. dimensions are in millimeters. c. dimensions and tolerance per asme y14.5m, 1994. d. datum c is defined by the spherical crowns of the balls. e. package nominal height is 586 microns 39 microns (547-625 microns). f. for dimensions d, e, x, and y see product datasheet. g. drawing filname: mkt-uc016aarev2. 0.03 c 2x 0.03 c 2x e d b c a 0.40 0.40 (?0.20) cu pad (?0.30) solder mask opening figure 16. wafer-level chip-scale package (wlcsp) product-specific dimensions product d e x y fan5701ucxx 1.610mm 1.610mm 0.205mm 0.205mm 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/ .
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 11 fan5701 ? compact 6 - led driver for mobile platforms physical dimensions (continued) b a 3.00 0.10 cab 0.05 c top view bottom view recommended land pattern 0.10 c 0.08 c c 0.05 0.00 0.10 c 2x 0.55 max side view seating plane 0.10 c pin #1 ident (0.15) pin 1 ident 1 4 12 9 13 16 5 8 0.50 3.00 0.50 2x 1.75 1.65 1.75 1.65 notes: a. design conforms to jedec mo-248. b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994. d. land pattern recommendation from pcb matrix ipc lp calculator (v2009). e. drawing filename: mkt-umlp16brev1. 1.75 1.75 3.00 3.00 16x 0.30 16x 0.75 16x 0.42 0.32 16x 0.30 0.20 0.50 figure 17. umlp-16 dimensions 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/ .
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fan5701 ? rev. 1.0.3 12 fan5701 ? compact 6 - led driver for mobile platforms

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