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january 2012 ? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface fan5622 / fan5624 / fan5626 linear led drivers with single-wire digital interface features ? family of three linear current-sink led drivers that support 2, 4, or 6 led outputs ? current sink driver for each led output: ? 30ma maximum output current ? 50mv drop-out at 15ma i out ? better than 3% matching between channels ? external r set ? single-wire digital control interface for easy programming ? 32 linear steps of dimming control ? less than 1a shut-down current ? short-circuit, under-voltage, and thermal protection ? wide input voltage range: 2.7 to 5.5v ? small form-factor packages: ? fan5622: 6-pin super sot23 ? fan5624: 10-lead 1.4x1.8x0.55mm umlp ? fan5626: 10-lead 1.6x2.1x0.55mm micropak? mlp applications ? mobile handsets ? mobile internet devices ? pmp and mp3 players ? lcd modules description the fan5622, fan5624, and fan5626 are two-, four-, and six-channel current-sink linear led drivers used to backlight the main lcd displays or keypads in mobile electronics, such as cellular phone handsets. a very low dropout of 50mv allows driving leds without any inductors or switch capacitors. the brightness levels of the led outputs are programmed through single-wire digital control interface. the user can program 32 linear dimming steps and turn on and off the leds through this interface by applying digital pulses. the fan562x family of linear led drivers provides high efficiency due to the low drop-out voltage of the led driver. good matching between different channels of led output is provided across the entire 32 dimming steps. these led drivers also integrate short circuit, under-voltage, and thermal protection to ensure for a more robust solution. the fan5622, fan5624, and fan5626 are available in very small form-factor packages: 6-pin super sot23, 10-lead umlp, and 10-lead micropak? mlp, respectively. figure 1. typical application of fan5622 ordering information part number # of channels temperature range package packing fan5622sx 2 -40 to 85c 6-lead, supersot 6, jedec mo-193, 1.6mm wide tape and reel fan5624umpx 4 -40 to 85c 10-lead, ultrathin molded leadless package (umlp) tape and reel FAN5626LX 6 -40 to 85c 10-lead ,micropak ,jedec mo255, 1.6 x 2.1mm tape and reel
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 2 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface applications diagrams figure 2. fan5624 typical application for 4 leds figure 3. fan5626 typical application for 6 leds block diagram figure 4. block diagram
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 3 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface pin configuration 1 2 3 6 5 4 led1 iset led2 ctrl gnd vin figure 5. fan5622: 6-pin ssot23, top view figure 6. fan5624: 10-lead umlp, top view 4 3 2 9 6 7 8 10 5 vin iset led6 led5 led4 led3 led2 led1 ctrl gnd 1 figure 7. fan5626: 10-lead micropak? mlp, top view pin definitions pin # name description fan5622 ssot23-6 fan5624 umlp10 fan5626 micropak mlp10 3 5 1 vin input voltage . connect to 2.7-5.5v dc input power source. 2 6 2 gnd ground 5 3 10 iset led current setting . full-scale led current is set by tying this pin through a resistor (r set ) to gnd. 1 7 3 ctrl control pin. program dimming levels by driving pin with digital pulses. this pin cannot be left floating. 6 8 4 led1 led cathode #1 . led current sink output. 4 10 5 led2 led cathode #2 . led current sink output. 1 6 led3 led cathode #3 . led current sink output. 2 7 led4 led cathode #4 . led current sink output. 8 led5 led cathode #5 . led current sink output. 9 led6 led cathode #6 . led current sink output. 4, 9 n/c no connect
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 4 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface 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. unit v cc vin pin -0.3 6.0 v other pins (1) -0.3 v in + 0.3 v esd electrostatic discharge protection level human body model per jesd22-a114 3.0 kv charged device model per jesd22-c101 1.5 kv 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 6.0v or v in +0.3v. 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. unit v in power supply voltage range 2.7 5.5 v t a operating ambient temper ature range -40 +85 c t j operating junction temperature range -40 +125 c i led(fs) full-scale led current 5 30 ma thermal properties junction-to-ambient thermal resistance is a function of application and board layout. this data is measured with boards in accordance to jedec standard jesd51. special attention must be paid not to exceed junction temperature t j(max) at a given ambient temperature t a . symbol parameter typical unit ? ja junction-to-ambient thermal resistance, ssot23-6 package 235 c/w junction-to-ambient thermal resistance, umlp10 package (2) 287 c/w junction-to-ambient thermal resistance, micropak? mlp10 package (3) 220 c/w notes: 2. recommended not to exceed 132mw of maximum power dissipation. 3. recommended not to exceed 198mw of maximum power dissipation.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 5 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface electrical specifications v in = 2.7v to 5.5v, r set = 19.10k ? , t a = -40c to +85c, v f = 2.5v to [3.5v or v in ? 0.1v], whichever is smaller. typical values are at t a = 25c, v in = 3.6v, and v f = 3.2v. symbol parameter condition min. typ. max. unit power supplies i sd shutdown supply current v in = 3.6v, ctrl = 0 0.3 1.0 a i in operating supply current fan5622: v in = 3.6v, i led = 0ma 0.4 0.8 ma fan5624: v in = 3.6v, i led = 0ma 0.6 1.0 ma fan5626: v in = 3.6v, i led = 0ma 0.8 1.2 ma i ih control pin input current ctrl = 1.8v 1 250 na v uvlo under-voltage lockout threshold v in rising 2.50 2.70 v v in falling 2.10 2.30 2.50 v regulation i fs_ledx (max) full-scale led output current i ledx = 30ma; x = 1 to 6 5 30 ma i led absolute current accuracy v in =2.85v ? 4.5v; v cath =0.15 to (1.2v or v in =2.55v, whichever is smaller); full-scale current 5- 30ma, t a = 25c -10 +10 % i led match led current matching (4) i ledx = 15ma; v_ledx=0.4v , t a = 25c -3 +3 % v iset i set drive voltage 9.53k ? r set 56.2k ? 1.20 v i ratio current mirror ratio from iset pin 9.53k ? r set 56.2k ? 240 ? i out_load i out load regulation v in = 3.6v, i ledx = 15ma, led v f = 2.7 to 3.5v, -3 +3 % ? i out_line i out line regulation v in = 2.7 to 4.8v, i ledx = 15ma, v cath = 0.5v -4 +4 % v dropout dropout voltage v in =3.6v; i led = 15ma, -10% i led drop 50 mv v in =3.6v; i led = 30ma, -10% i led drop 60 tsd thermal shutdown rising temperature at junction 150 c hysteresis 20 logic input (ctrl) v ih high-level input voltage 1.2 v v il low-level input voltage 0.4 v t lo ctrl low time for dimming v in = 3.6v; see figure 17 0.5 300 s t hi time delay between steps v in = 3.6v; see figure 17 0.5 s t on ctrl high to turn-on delay v in = 3.6v; see figure 17 250 s t sd ctrl low, shutdown pulse width v in = 3.6v; from falling edge of ctrl 1 ms note: 4. for the two, four, and six led curr ent sinks of fan5622, fan5624, and fan5626 respectively; the following are determined: the maximum sink current of the two, four, and six led outputs (max); the minimum sink current of the two, four, and six outputs (min); and t he average sink current (avg). for all of the led outputs, two matching numbers are calculated: (max-avg)/ avg and (avg-mi n)/avg. the largest number of the two (worst case) is considered the matching figure for the part. the matching figure for a given par t is considered to be the highest matching figure of all led outputs. the typical specification pr ovided is the most likely norm of the matching figure for all parts.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 6 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface typical performance characteristics figure 8. efficiency vs. input voltage where led v f =3.2v figure 9. dropout voltage vs. input voltage figure 10. current match of channels vs. input voltage figure 11. load regulation at 15ma/output figure 12. shutdown current vs. input voltage figure 13. quiescent current vs. input voltage
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 7 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface typical performance characteristics figure 14. startup waveform for fan5626 figure 15. shutdown waveform for fan5626 figure 16. dimming operation
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 8 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface circuit description the fan5622, fan5624, and fan5626 are a family of current-sink linear led driver ics able to drive two, four, and six leds respectively. these three devices are powered directly from 2.7v to 5.5v supply and all the channels are controlled via the integrated current sinks from the external power source. designed with a very low drop-out voltage, the fan562x products can operate close to the input supply voltage without the need for additional inductive boost or capacitive switching circuitry. all three devices require only two additional discrete passive components: a single 1f input ceramic capacitor and a resistor (r set ) to set the maximum curr ent for the leds. each current-sink output provides constant current and can drive the leds up to 30ma. fairchild semiconductor?s tinywire? single-wire digital interface enables these led drivers to program the brightness level of the leds in 32 linear steps. setting maximum current the maximum led current of the fan5622, fan5624, and fan5626 is programmed by an external resistor called rset. the maximum full-scale led current for all three led drivers is 30ma and it can go as low as 5ma. the fan562x products also operate below 5ma full-scale led current by using a larger r set value. however, the led channel accuracy and matching specifications are guaranteed. table 1 shows the rset resistor values for seve ral full-scale current levels . table 1. maximum led current settings by resistor i led (ma) r set (k ? ) 5 56.20 10 28.70 15 19.10 20 14.30 25 11.50 30 9.53 digital interface & dimming control the fan5622, fan5624, and fan5626 implement a simple single-wire digital interface to program the led brightness to one of thirty two (32) levels spaced in linear steps. to maintain the brightness of the leds at a specific dimming level, the digital pulse signal to the ctrl pin should be held high for that last pulse. it is held high for as long as desired to keep the leds illuminated at that specific brightness level. table 2 outlines the dimming levels while figure 17 shows how to change the dimming levels. table 2. brightness control levels (r set = 19.10k ? ) dimming level current level i led (ma) 1 1.67% 0.25 2 3.33% 0.50 3 5.00% 0.75 4 6.67% 1.00 5 10.00% 1.50 6 13.33% 2.00 7 16.67% 2.50 8 20.00% 3.00 9 23.33% 3.50 10 26.67% 4.00 11 30.00% 4.50 12 33.33% 5.00 13 36.67% 5.50 14 40.00% 6.00 15 43.33% 6.50 16 46.67% 7.00 17 50.00% 7.50 18 53.33% 8.00 19 56.67% 8.50 20 60.00% 9.00 21 63.33% 9.50 22 66.67% 10.00 23 70.00% 10.50 24 73.33% 11.00 25 76.67% 11.50 26 80.00% 12.00 27 83.33% 12.50 28 86.67% 13.00 29 90.00% 13.50 30 93.33% 14.00 31 96.67% 14.50 32 100.00% 15.00
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 9 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface digital dimming control figure 17. digital pulse dimming control diagram
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 10 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface physical dimensions figure 18. 6-lead ssot23 package drawings are provided as a service to customers considering fairchild component s. drawings may change in any manner wit hout notice. please note the revision and/or date on the drawing and contact a fairchild semi conductor 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 packagi ng area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 11 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface physical dimensions (continued) a b c seating plane detail a pin#1 ident recommended land pattern notes: a. package does not fully conform to jedec standard. b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994. d. land pattern recommendation is based on fsc design only. e. drawing filename: mkt-umlp10arev3. top view bottom view 0.15 c 0.08 c 0.15 c 2x 2x side view 0.10 c 0.05 3 6 1 0.10 c a b 0.05 c 0.55 max. 10 1.40 1.80 0.40 0.15 0.25 (10x) 0.35 0.45 (9x) 1.70 2.10 0.40 0.663 0.563 (9x) 0.225 (10x) 1 0.152 0.10 0.10 0.55 0.45 0.10 detail a scale : 2x 1.85 1.45 0.55 0.40 0.225 (10x) 9x 0.45 pin#1 ident optional minimial toe land pattern scale : 2x lead option 1 scale : 2x lead option 2 package edge figure 19. 10-lead, ultrathin molded leadless package (umlp) package drawings are provided as a service to customers considering fairchild component s. drawings may change in any manner wit hout notice. please note the revision and/or date on the drawing and contact a fairchild semi conductor 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 packagi ng area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 12 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface physical dimensions (continued) bottom view top view recommended land pattern side view 2x 2x notes: a. package conforms to jedec registration mo-255, variation uabd . b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994. d. presence of center pad is package supplier dependent. if present it is not intended to be soldered and has a black oxide finish. e. drawing filename: mkt-mac10arev5. 0.10 c 0.10 c 0.10 cab 0.05 c pin1 ident is 2x longer than other lines a b c 0.35 0.25 9x 9x 14 9 6 0.25 0.15 10 5 0.50 0.56 1.62 0.05 0.00 0.05 c 0.55 max 0.05 c 1.60 2.10 (0.35) (0.25) 0.50 10x 10x (0.11) 1.12 1.62 keepout zone, no traces or vias allowed (0.20) (0.15) 0.35 0.25 0.35 0.25 detail a detail a 2x scale 0.35 0.25 0.65 0.55 d all features (0.36) (0.29) 0.56 figure 20. 10-lead micropak? mlp package drawings are provided as a service to customers considering fairchild component s. drawings may change in any manner wit hout notice. please note the revision and/or date on the drawing and contact a fairchild semi conductor 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 packagi ng area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2010 fairchild semiconductor corporation www.fairchildsemi.com fan5622 / fan5624 / fan5626 ? rev. 1.0.2 13 fan5622 / fan5624 / fan5626 ? linear led dr ivers with single-wire digital interface

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