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aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 1 chargepump ? general description the aat3170 is a high output current, high effi- ciency, low noise, low profile charge pump dc/dc converter, ideal for multi-function led photo-flash applications where solution cost, size, and efficien- cy are critical. the dual charge pump in the aat3170 is capable of delivering 600ma output current. two current- controlled paths are available for users of dual flash leds that prefer current matching. each led channel can be easily programmed in 32 steps with a single gpio output through the as 2 cwire? (advanced simple serial control?) interface. this allows smooth transitions and flexible adjustment of brightness in flash or other lighting modes. the tri-mode (1x/1.5x/2x) operation of the internal charge pump offers excellent power efficiency for both flash and movie modes. combined with a low external parts count (two 1f flying capacitors and one small bypass capacitor at v in and out), the aat3170 is ideally suited for small, battery-powered applications. the aat3170 has a thermal management system to protect the device in the event of a short-circuit con- dition at the output pin. built-in soft-start circuitry prevents excessive inrush current during start-up. the shutdown feature disconnects the load from v in and reduces quiescent current to less than 1.0a. the aat3170 is available in the pb-free, thermally- enhanced, 12-pin 3x3mm tdfn package. features ?v in range: 2.7v to 5.5v ? 600ma output current ? tri-mode 1x/1.5x/2x in current mode ? voltage mode operation: 1.5x, 200ma ? dual regulated current sinks ? current match between current sinks ? 32 current steps set by as 2 cwire ? 1f input, output, and flying capacitors ? <1.0a of shutdown ? small application circuit ? no inductors ? automatic soft start ? 12-pin tdfn 3x3mm package ? -40c to +85c temperature range applications ? camera phones ? digital still cameras (dscs) ? pdas and notebook pcs ? smart phones typical application aat3170 c out 2.2f en/set vin c1+ c1- c2+ c2- vout f1 f2 2.7v to 5.5v en/set flash c t 0.1f led 1 flash led 2 ct gnd c in 4.7f c1 1f c2 1f
aat3170 high current led flash driver charge pump ic 2 3170.2006.11.1.1 pin descriptions pin configuration tdfn33-12 (top view) pin # symbol function 1, 12 vin input power supply pin. requires 4.7f or larger ceramic bypass capacitor to ground. 2 c1+ flying capacitor c1 positive terminal. connect a 1f ceramic capacitor between c1+ and c1-. 3 c1- flying capacitor c1 negative terminal. 4 gnd ground connection. 5 f1 current sink input #1. 6 f2 current sink input #2. 7 en/set as 2 cwire serial interface control pin. 8 ct flash timer control capacitor input. connect a 100nf capacitor from ct to gnd for a one sec- ond timeout duration. 9 c2- flying capacitor c2 negative terminal. 10 c2+ flying capacitor c2 positive terminal. connect a 1f ceramic capacitor between c2+ and c2-. 11 vout charge pump output. requires 2.2f or larger ceramic capacitor connected between this pin and ground. ep exposed paddle (bottom); connect to gnd directly beneath package. vin c1+ c1- 1 gnd f1 f2 vin vout c2+ c2- ct en/set 2 3 4 5 6 12 11 10 9 8 7
aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 3 absolute maximum ratings 1 t a = 25c, unless otherwise noted. thermal information 2, 3 symbol description value units ja maximum thermal resistance 50 c/w p d maximum power dissipation 2 w symbol description value units v in input voltage -0.3 to 6.0 v v en en to gnd voltage -0.3 to 6.0 v v en(max) maximum en to input voltage v in + 0.3 v i out maximum dc output current 700 ma t j operating junction temperature range -40 to 150 c t s storage temperature range -65 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c ondi- tions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on an fr4 board. 3. derate 20mw/c above 40c ambient temperature.
aat3170 high current led flash driver charge pump ic 4 3170.2006.11.1.1 electrical characteristics 1 c in = 4.7f, c out = 2.2f, c 1 = c 2 = 1.0f; t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c, v in = 3.6v. symbol description conditions min typ max units power supply v in input voltage range 2.7 5.5 v on/off standby mode, code 10 address = 4, data = 2 a i cc operating current 1x, no load current 300 3.0 v in 5.5, 1.5x mode, no load current 2.0 4.0 ma 3.0 v in 5.5, 2x mode, no load current 3.0 6.0 i shdn(max) v in pin shutdown current en = 0 1.0 a i out(max) maximum output current v f = 3.6v 600 ma i (d-match) current matching between v in = 3.6v, t a = 25c, 428ma outputs; high current code address = 3, data = 2; 8 % code address = 0, data = 4 i (d-match) current matching between v in = 3.6v, t a = 25c, 100ma outputs; low current code address = 3, data =1; 8 % code address = 0, data = 1 i dx output current accuracy t a = 25c, code 1, hi scale 270 330 ma f clk clock frequency 1 mhz v reg voltage mode regulation en/set code address = 6, data = 2 4.1 4.5 4.9 v t ss soft-start time 200 s en/set v il enable threshold low v in = 2.7v 0.4 v v ih enable threshold high v in = 5.5v 1.4 v t en/set lo en/set low time 0.3 75 s t en/set hi min minimum en/set high time 50 ns t en/set hi max maximum en/set high time 75 s t off en/set off timeout 500 s t lat en/set latch timeout 500 s input current en/set input leakage -1 1 a 1. the aat3170 is guaranteed to meet performance specifications from 0c to 70c. specification over the -40c to +85c operati ng temperature range is assured by design, characterization, and correlation with statistical process controls.
aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 5 typical characteristics v in = 3.6v, c in = 4.7f, c out = 2.2f, c 1 = c 2 = 1f, t a = 25c, unless otherwise noted. turn-off from 1.5x mode (v in = 3.2v; 50ma/ch load) time (200s/div) en (2v/div) v f (1v/div) i in (200ma/div) turn-on to 2x mode (v in = 3.2v; 300ma/ch load) time (500s/div) en (2v/div) v out (2v/div) i in (500ma/div) v sink (1v/div) turn-on to 1x mode (v in = 4.2v; 300ma/ch load) time (500s/div) en (2v/div) v out (2v/div) i in (500ma/div) v sink (1v/div) turn-on to 1.5x mode (v in = 3.2v; 50ma/ch load) time (200s/div) en (2v/div) v out (2v/div) i in (200ma/div) v sink (1v/div) turn-on to 1x mode (v in = 4.2v; 50ma/ch load) time (200s/div) en (2v/div) v out (2v/div) i in (200ma/div) v sink (1v/div) efficiency vs. supply voltage supply voltage (v) efficiency (%) 20 30 40 50 60 70 80 90 100 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4. 2 50ma/ch v f = 2.9v 152ma/ch v f = 3.2v 95ma/ch v f = 3.1v
aat3170 high current led flash driver charge pump ic 6 3170.2006.11.1.1 typical characteristics v in = 3.6v, c in = 4.7f, c out = 2.2f, c 1 = c 2 = 1f, t a = 25c, unless otherwise noted. flash timer duration (c t = 0.1f; data = 1) supply voltage (v) flash time (s) 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5. 5 -40 c 25 c 85 c voltage mode load regulation load current (ma) output voltage (v) 4.2 4.3 4.4 4.5 4.6 4.7 4.8 0 50 100 150 200 250 300 v in = 4.2v v in = 3.7v v in = 3.3v voltage mode line regulation supply voltage (v) output voltage (v) 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 i out = 10ma i out = 80ma i out = 120ma i out = 30ma load characteristic (v in = 2.8v; 2x mode; 152ma/ch load) time (2s/div) v in (100mv/div) v sink (200mv/div) v out (200mv/div) load characteristic (v in = 3.6v; 1.5x mode; 152ma/ch load) time (2s/div) v in (100mv/div) v sink (200mv/div) v out (200mv/div) load characteristic (v in = 3.0v; 1.5x mode; 50ma/ch load) time (2s/div) v in (100mv/div) v sink (200mv/div) v out (200mv/div)
aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 7 typical characteristics v in = 3.6v, c in = 4.7f, c out = 2.2f, c 1 = c 2 = 1f, t a = 25c, unless otherwise noted. en/set latch timeout vs. supply voltage supply voltage (v) en/set latch timeout (s) 0 50 100 150 200 250 300 350 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -40 c 25 c 85 c flash timer duration (c t = 0.1f; data = 16) supply voltage (v) flash time (ms) 20 40 60 80 100 120 140 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -40 c 25 c 85 c en/set low threshold voltage vs. supply voltage and temperature supply voltage (v) en/set low threshold voltage (v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -40 c 25 c 85 c en/set high threshold voltage vs. supply voltage and temperature supply voltage (v) en/set high threshold voltage (v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -40 c 25 c 85 c en/set off timeout vs. supply voltage supply voltage (v) en/set off timeout (s) 0 50 100 150 200 250 300 350 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -40 c 25 c 85 c
aat3170 high current led flash driver charge pump ic 8 3170.2006.11.1.1 functional description the aat3170 is a high efficiency, low noise, dual stage tri-mode 1x/1.5x/2x charge pump device intended for photo-flash led applications. the aat3170 requires only four external components: two 1.0f ceramic capacitors for the charge pump flying capacitors, one 4.7f ceramic capacitor for c in , and one 2.2f ceramic capacitor for c out . the charge pump is designed to deliver load cur- rents up to 600ma. the dual stage charge pump section contains soft-start circuitry to prevent excessive in-rush current during start-up. system efficiency is maximized with a tri-mode, dual stage charge pump topology. the internal clock oscilla- tor, which operates at 1mhz, allows the use of small external components. the tri-mode charge pump architecture optimizes power conversion efficiency. depending upon the combination of load current, input voltage, and nominal led forward voltage, the charge pump will operate in a 1x, 1.5x, or 2x mode to generate the output voltage required to power the load for a pro- grammed constant current setting. this results in significant power savings over voltage doubling architectures, especially when the leds are con- tinuously operated at lower current levels in movie viewing or flashlight modes. constant current channels the aat3170 contains two programmable constant current sinks for integrated flash circuit control. efficiency is optimized with the low dropout char- acteristic of the current sinks. the low dropout per- formance extends the battery operating range for 1x and 1.5x modes, improving efficiency and extending battery life. each constant current sink is programmable through the as 2 cwire serial inter- face. independent current settings can be used for a multistage flash led control. this feature allows users to conveniently drive separate dual flash leds directly while achieving good brightness functional block diagram charge pump section 1 charge pump section 2 1mhz oscillator soft start control c1+ c1- c2+ c2- out f1 f2 gnd ct en/set vin system control; as 2 cwire; timing
aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 9 matching. also, f1 and f2 can be connected together for single output configuration. modes of operation in addition to the data registers that set the current levels for the two current sinks, the aat3170 has three mode registers. register 3 is the hi/lo mode register. it sets the maximum per channel current level to either 300ma or 50ma. each chan- nel can be set independently so one channel can be for flash while the other can be in a low constant current mode. register 4 is the on/off register. when set with data = 1, both current sources are enabled (default); when set with data = 2, both current sources are dis- abled. when register 4 is set to off, the device is in standby mode with significantly reduced quiescent current. the aat3170 has a software programmable timer function to automatically adjust the flash on-time duration. this feature can be used directly to set the flash on-time, or it can be used indirectly for fault tolerant flash protection. when used for flash protection, the user can be sure that the flash will still turn off in the event of any system software or hardware malfunction. write to address 5 to enable the flash timer and flash channels. when the timer register is addressed and data is latched, the on/off regis- ter is automatically switched to on, enabling the current sinks for the duration of the programmed time. when the timer expires, the on/off register is switched to off, disabling the current sinks. the on-time t depends on the combination of the setting of the timer register and the value of the tim- ing capacitor, which are listed in the ?timer register? table. calculate the timer capacitor value according to the following formula: where c t is in micro-farads. for example, using a 0.1f timer capacitor value results in an on-time duration of one second. the aat3170 also includes a regulated output voltage mode setting. by setting register 6 with data = 2 for voltage mode, the charge pump deliv- ers a regulated 4.5v output that continuously oper- ates in 1.5x mode. it is suitable for driving loads of up to 200ma. the voltage mode may be used to drive leds with ballast resistors. driving either f1 or f2 in current mode will override the voltage mode state until f1 and f2 are set back to zero current by either data or mode register. setting register 5 with data = 1 will reset the mode back to current mode and the charge pump output volt- age will regulate appropriately. as 2 cwire serial interface the aat3170 utilizes the as 2 cwire serial interface to enable/disable the charge pump, set the operat- ing mode, and adjust the output current level of each constant current sink. each current sink can be independently programmed with sixteen current levels (see table below). as 2 cwire incorporates addressing to program the operating modes and current level settings. constant current sink nominal programming levels as 2 cwire relies on the number of rising edges of the en/set pin to address and load the registers. 300ma hi scale 50ma lo scale data i sink (ma/chnl) i sink (ma/chnl) 1 300 50 2 267 44 3 238 40 4 214 36 5 190 32 6 167 28 7 152 25 8 133 22 9 119 20 10 105 17 11 95 16 12 86 14 13 76 13 14 67 11 15 62 10 16 0 0 t (seconds) = 10 c t (f)
aat3170 high current led flash driver charge pump ic 10 3170.2006.11.1.1 as 2 cwire latches data or address after the en/set pin has been held high for time t lat (500s). address or data is differentiated by the number of en/set rising edges. since the data registers are 4 bits each, the differentiating number of pulses is 2 4 or 16, so that address 0 is signified by 17 rising edges, address 1 by 18 rising edges, and so forth. data is set to any number of rising edges between 1 and including 16. a typical write protocol is a burst of en/set rising edges, signifying a particu- lar address, followed by a pause with en/set held high for the t lat timeout period, a burst of rising edges signifying data, and a t lat timeout for the data registers. once an address is set, then multi- ple writes to that address are allowed where only data is issued. when en/set is held low for an amount of time greater than t off (500s), the aat3170 enters into shutdown mode and draws less than 1a from the supply. address 0 is the default address on the first rising edge after the aat3170 has been disabled. after shutdown, if only data is issued with the first rising edge (i.e., 1 - 16 edges, no address given), both current sinks will be programmed since the default will be address 0. as 2 cwire serial interface addressing hi/lo scale register (address 3) on/off register (address 4) timer register (address 5) voltage register (address 6) thermal protection the aat3170 has a thermal protection circuit that will shut down the charge pump if the die tempera- ture rises above the thermal limit, as is the case during a short circuit of the out pin. data mode 1 current 2 voltage on-time data t (sec) = 10 c t (f) 1 16/16 x t 2 15/16 x t 3 14/16 x t 4 13/16 x t 5 12/16 x t 6 11/16 x t 7 10/16 x t 8 9/16 x t 9 8/16 x t 10 7/16 x t 11 6/16 x t 12 5/16 x t 13 4/16 x t 14 3/16 x t 15 2/16 x t 16 1/16 x t data mode 1on 2 off data f1 f2 1lolo 2hihi 3lohi 4hilo en/set address rising edges data register 0 17 f1 and f2 current scale 1 18 f1 current scale 2 19 f2 current scale 3 20 hi/lo 4 21 on/off 5 22 timer 6 23 voltage/current mode
aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 11 as 2 cwire serial interface timing applications information as 2 cwire programming generally, programming the aat3170 is achieved by submitting bursts of address and data edges to the en/set pin. however, in some cases multiple bursts of address and data are needed to enable a particular operating mode. in other cases, only a single burst of data edges is required. to enable both flash channels to a current setting on the lo scale, the user submits a single burst of address and data edges. to enable both flash chan- nels to a current setting on the hi scale, the user must submit a burst of address and data edges to program the current setting level, and then submit a second burst of address and data edges to program the hi/lo scale register to the hi scale. shortcuts can also be used. if the device is in shut- down, both flash channels can be enabled to a set- ting on the lo scale by just giving a single burst of data edges. the address edges are not needed because all registers are reset during shutdown and address 0 is the default. further, a single burst of data edges can be used to change from one set- ting to another for the last address. the address register is not reset after each write; therefore, sub- mitting address edges is only required when changing the address. additional applications the constant voltage mode feature of the aat3170 allows the user to combine the flash feature with additional applications. additional applications such as auxiliary lighting and status leds can be added while eliminating the need for an additional power supply, which is normally required. since the constant voltage mode can supply a regulated out- put at up to 200ma load, it is capable of driving ten leds at 20ma each. it is suitable for keypad light- ing, status lighting, and other applications where a 4.5v power supply could be used. when enabling constant voltage mode, the led channels f1 and f2 are automatically disabled so current does not flow through the flash led during constant voltage mode. because of this, very little programming is required. the user just addresses the voltage mode register and programs it to volt- age mode. address data 1 en/set 2 17 18 address data reg 1 data reg 2 1 2 . . . n <= 16 0 1 0 0 n - 1 t hi t lo t lat t lat
aat3170 high current led flash driver charge pump ic 12 3170.2006.11.1.1 led selection the aat3170 is designed to drive high-intensity white leds. it is particularly suitable for leds with an operating forward-voltage in the range of 4.2v to 1.5v. the charge pump device can also drive other loads that have similar characteristics to white leds. for various load types, the aat3170 provides a high-cur- rent, programmable ideal constant current source. device power efficiency the aat3170 power conversion efficiency depends on the charge pump mode. by definition, device efficiency is expressed as the output power delivered to the led divided by the total input power consumed. figure 1: flash plus auxiliary lighting. figure 2: flash plus status lighting. = p ou t p in aat3170 c out 2.2f en/set vin c1+ c1- c2+ c2+ vout f1 f2 2.7v to 5.5v en/set flash led gnd c in 4.7f c1 1f c2 1f stat 2 stat1 ct aat3170 c out 2.2f en/set vin c1+ c1- c2+ c2- vout f1 f2 2.7v to 5.5v en/set flash led gnd c in 4.7f c1 1f c2 1f aux_en ct
aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 13 when the input voltage is sufficiently greater than the led forward voltage, the device optimizes effi- ciency by operating in 1x mode. in 1x mode, the device is working as a bypass switch and passing the input supply directly to the output. the power conversion efficiency can be approximated by: due to the very low 1x mode quiescent current, the input current nearly equals the current delivered to the led. further, the low-impedance bypass switch introduces negligible voltage drop from input to output. the aat3170 further maintains optimized perform- ance and efficiency by detecting when the input voltage is not sufficient to sustain led current. the device automatically switches to 1.5x mode when the input voltage drops too low in relation to the led forward voltage. in 1.5x mode, the output voltage can be boosted to 3/2 the input voltage. the 3/2 conversion ratio introduces a corresponding 1/2 increase in input current. for ideal conversion, the 1.5x mode effi- ciency is given by: similarly, when the input falls further, such that 1.5x mode can no longer sustain led current, the device will automatically switch to 2x mode. in 2x mode, the output voltage can be boosted to twice the input voltage. the doubling conversion ratio introduces a corresponding doubling of the input current. for ideal conversion, the 2x mode effi- ciency is given by: capacitor selection careful selection of the four external capacitors (c in , c 1 , c 2 , and c out ) is important because they will affect turn-on time, output ripple, and transient performance. optimum performance will be obtained when low equivalent series resistance (esr) (<100m ) ceramic capacitors are used. a value of 1f for the flying capacitors is a good starting point when choosing capacitors. if the led current sinks are only programmed for light current levels, then the capacitor size may be decreased. ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the aat3170. ceramic capacitors offer many advantages over their tantalum and aluminum elec- trolytic counterparts. a ceramic capacitor typically has very low esr, is lowest cost, has a smaller pcb footprint, and is non-polarized. low esr ceramic capacitors help maximize charge pump transient response. equivalent series resistance esr is an important characteristic to consider when selecting a capacitor. esr is a resistance internal to a capacitor that is caused by the leads, internal connections, size or area, material compo- sition, and ambient temperature. capacitor esr is typically measured in milliohms for ceramic capac- itors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials ceramic capacitors less than 0.1f are typically made from npo or c0g materials. npo and c0g materials typically have tight tolerance and are sta- ble over temperature. large capacitor values are typically composed of x7r, x5r, z5u, or y5v dielectric materials. large ceramic capacitors are often available in lower-cost dielectrics, but capac- itors greater than 4.7f are not typically required for aat3170 applications. capacitor area is another contributor to esr. capacitors that are physically large will have a lower esr when compared to an equivalent material, smaller capacitor. these larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. = = v f i led v in 2i in v f 2 v in = = v f i led v in 1.5i in v f 1.5 v in = v f i led v in i in v f v in
aat3170 high current led flash driver charge pump ic 14 3170.2006.11.1.1 pcb layout to achieve adequate electrical and thermal per- formance, careful attention must be given to the pcb layout. in the worst-case operating condition, the chip must dissipate considerable power at full load. adequate heat-sinking must be achieved to ensure intended operation. figure 3 illustrates an example of an adequate pcb layout. the bottom of the package features an exposed metal paddle. the exposed paddle acts, thermally, to transfer heat from the chip and, elec- trically, as a ground connection. the junction-to-ambient thermal resistance ( ja ) for the package can be significantly reduced by follow- ing a couple of important pcb design guidelines. the pcb area directly underneath the package should be plated so that the exposed paddle can be mated to the top layer pcb copper during the re-flow process. this area should also be connect- ed to the top layer ground pour when available. further, multiple copper plated thru-holes should be used to electrically and thermally connect the top surface paddle area to additional ground plane(s) and/or the bottom layer ground pour. the chip ground is internally connected to both the paddle and the gnd pin. the gnd pin conducts large currents and it is important to minimize any differences in potential that can result between the gnd pin and exposed paddle. it is good practice to connect the gnd pin to the exposed paddle area using a trace as shown in figure 3. the flying capacitors c1 and c2 should be con- nected close to the chip. trace length should be kept short to minimize path resistance and potential coupling. the input and output capacitors should also be placed as close to the chip as possible. figure 3: example pcb layout.
aat3170 high current led flash driver charge pump ic 3170.2006.11.1.1 15 advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 phone (408) 737- 4600 fax (408) 737- 4611 ordering information package information tdfn33-12 all dimensions in millimeters. package marking 1 part number (tape and reel) 2 tdfn33-12 qlxyy AAT3170IWP-T1 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or specifi cations or to discontinue any product or service without notice. customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information b eing relied on is current and complete. all products are sold sub- ject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. analogictech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with anal ogictech?s standard warranty. testing and other quality con- trol techniques are utilized to the extent analogictech deems necessary to support this warranty. specific testing of all param eters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and produ ct names appearing in this document are regis- tered trademarks or trademarks of their respective holders. top view bottom view detail "b" detail "a" side view 3.00 2.40 + all analogictech products are offered in pb-free packaging. the term ?pb-free? means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/pbfree.

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