microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2002 rev. 1.0a, 10/21/2002 www. microsemi . com thermalmax ? lx1810 thermoelectric cooler drive controller ic p roduction d ata s heet integrated products description the lx1810 is a full-bridge thermo-electric cooler (tec) controller specifically designed for high performance opto-electronic products where precise temperature control is required. these products tune or stabilize sensitive optical components in applications that include frequency tunable fiber optic lasers, edfa amplifiers, waveguides, and other dense wavelength division multi- plexing (dwdm) components. other applications include microwave transistors in new wireless base- stations. the lx1810 uses highly efficient (>90%) pulse width modulation (pwm) technology, allowing the controller to be conveniently mounted near the tec withou t adding heat to the system. the lx1810 operates on a single voltage supply, greatly simplifying supply requirements, with an operating frequency that is high enough to eliminate detrimental thermal stresses to the tec. the output ripple factor o f the system can be maintained well below 10% thus not effecting the performance of delta t control. utilizing a full-bridge topology, the lx1810 can be used for both heating and cooling operations. the lx1810, when used in conjunction with a temperature sense device, accurately regulates tec current levels allowing tight control of temperature. fully integrated fet drivers in a 28- pin ssop allows the design of a fully functional tec controller while minimizing board space. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features integrated switching full-bridge pwm drive architecture single dc supply operation very low output noise maximum efficiency 90% high output integrated drivers psrr ?70db typical differential input to minimize noise external oscillator synchronization 28-pin ssop package applicati ons/benefits peltier effect (thermoelectric coolers) controllers high efficiency h-bridge drive circuits rf power amplifier electronic cooling cpu electronic cooling product highlight lx1810 v in = 15v tec r t package order info t a ( c) db plastic ssop 28-pin 0 to 70 lx1810-cdb note: available in tape & reel. append the letter ?t? to the part number. (i.e. LX1810-CDBT) l l x x 1 1 8 8 1 1 0 0 obsolete product not recommended for new designs
microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2002 rev. 1.0a, 10/21/2002 www. microsemi . com thermalmax ? lx1810 thermoelectric cooler drive controller ic p roduction d ata s heet integrated products absolute maximum ratings supply voltage (pvdd, vdd) ....................................................................... -0.3 v to 15v sleep, status, fbk+, fbk- ........................................................... -0.3v to v dd +0.3v is- ..............................................................................................pv dd ?2 to pv dd to +0.3v rpwm, cpwm, mute ...................................................................... -0.3v to v ref +0.3v input +, input -, i nampout........................................................ -0.3v to v ref +0.3v eain, eaout, faout ..................................................................... -0.3 v to v ref +0.3v clock .................................................................................................. -0.3v to c n +0.3v operating junction temperatur e plastic (db package) ............................................. 125 o c storage temperat ure rang e ....................................................................... -65 o c to 150 o c lead temperature (solde ring, 10 s econds) ............................................................... 300 o c note: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of specified terminal . thermal data db plastic ssop 28-pin thermal resistance - junction to a mbient , ja 50 c/w junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the therma l performance of the device/pc-board system. all of the above assume no ambient airflow. package pin out inampout 14 28 15 vref gnd nc v25 rpwm cpwm input- input+ stby status eain eaout clock is- cp vdd pvdd p+ n- pgnd n+ p- cn fbk- fbk+ faout shdn functional pin description pin name description pin name description vref 5v reference faout feedback amplifier output gnd low current ground fbk+ feedback amplifier non-inverting input nc no internal connection fbk- feedback amplifier inverting input v25 2.5v reference cn supply decoupling for nfet drivers rpwm pwm oscillator timing resistor pgnd output driver high current ground cpwm pwm oscillator timing capacitor p- drive for pfet on negative half of bridge input+ positive differential amplifier input n- drive for nfet on negative half of bridge input - negative differential amplifier input n+ drive for nfet on positive half of bridge inampout input differential amplifier output p+ drive for pfet on positive half of bridge shdn ic shutdown control input (active low) pvdd output driver supply voltage stby ic standby control input (active high) vdd analog supply voltage status uvlo indicator (open collector output) cp supply decoupling for pfet drivers eain inverting input of error amplifier is - current limit sense input eaout error amplifier output clock input / output clock for synch operation p p a a c c k k a a g g e e d d a a t t a a obsolete product not recommended for new designs
microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2002 rev. 1.0a, 10/21/2002 www. microsemi . com thermalmax ? lx1810 thermoelectric cooler drive controller ic p roduction d ata s heet integrated products electrical characteristics unless otherwise specified, the following specifications apply over the operati ng ambient temperature 0c < ta < 70c. test conditions: rpwm = 49.9k, cpwm = 100pf, vdd = pvdd = 15v lx1810 parameter symbol test conditions min typ max units ` supply voltage supply voltage v dd 7 15 v power supply rejection ratio psrr v in = 15v, v ripple = 1v rms , 10hz to 10khz -70 db ` oscillator section oscillator frequency f osc 335 khz charge current i chg (varies with v dd pin voltage) -110 a discharge current i dis (varies with v dd pin voltage) 110 a oscillator peak voltage v pk (varies with v dd pin voltage) 3.4 v oscillator valley voltage v val (varies with v dd pin voltage) 1.6 v voltage stability v dd = 8v to 15v 0.6 2 % t a = 0 o c to 70 o c 1.0 2 % temperature stability t a = -40 o c to 125 o c 1.5 % ` error amplifier input offset voltage v io 5 ? mv dc open loop gain a ol 60 db unity gain bandwidth ugbw 7 ? mhz high output voltage v oh i out = -100 a v ref ?1 v low output voltage v ol i out = +100 a 50 ? mv input common mode range input bias current i in v in = 1v to v ref 1 a ` input amplifier stage gain set by internal resistors 3.465 3.5 3.535 v/v output voltage, high v oh i out = -100 a 3.85 v output voltage, low v ol i out = +100 a 1.3 ? mv input impedance 42 ? k ? ` feedback amplifier stage gain set by internal resistors 89 91 93 ? mv/v input impedance 388 k ? ` current limit comparator voltage sense threshold 190 210 230 mv blanking pulse delay 500 ? ns response time excludi ng blanking pulse 250 ? ns i um pulses required to current limit latch (required number of clock cycles) 9 9 9 consecutive clear pulses required to reset i um counter (required number of clock cycles) 2 2 2 ` reference voltage section initial accuracy 5.000 voltage stability 25 50 ? mv temperature stability t a = 0 o c to 70 o c 2 5 ? mv t a = -40 o c to 125 o c 4 10 ? mv line regulation v dd = 9v to 15v 0.5 ? mv load regulation i out = 0 to 20ma 5 ? mv ` under voltage lockout section start threshold voltage 6.5 v uv lockout hysteresis 0.5 6.5 v uvlo delay to output enable (required number of clock cycles) 62,500 e e l l e e c c t t r r i i c c a a l l s s obsolete product not recommended for new designs
microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2002 rev. 1.0a, 10/21/2002 www. microsemi . com thermalmax ? lx1810 thermoelectric cooler drive controller ic p roduction d ata s heet integrated products electrical characteristics (cont) unless otherwise specified, the following specifications apply over the operati ng ambient temperature 0c < ta < 70c. test conditions: rpwm = 49.9k, cpwm = 100pf, vdd = pvdd = 15v lx1810 parameter symbol test conditions min typ max units ` supply current shdn current shdn input = 0v, t a = 25 o c 25 a operating current shdn input = 2v, v in = 15v, no mosfets connected 2.9 5.0 ? mv shdn to output enable (required number of clock cycles) 62,500 shdn threshold 1.2 1.45 1.6 v ` standby section standby threshold 1.6 1.7 1.8 v ` output drivers for n-channel mosfets i sink = 3ma 30 100 ? mv nfet drivers, low level voltage v ol i sink = 75ma 1.5 2.0 v i source = 3ma, c n = 5.2v applied externally 30 100 ? mv nfet drivers, high level voltage v oh i source = 75ma, c n = 5.2v applied externally 1.5 2.0 v ` output drives for p-channel mosfets i sink = 3ma 30 100 ? mv pfet drivers, low level voltage v ol i sink = 75ma 1 1.5 v i source = 3ma, c p = 5.2v (applied externally) 30 100 ? mv pfet drivers, high level voltage v oh i source = 75ma, c p = 5.2v (applied externally) 1 1.5 v block diagram vref v25 cn pvdd cp p+ n+ p- n- faout fbk- fbk+ vdd is- clock rpw m cpw m eaout eain inampout input - input + stby uvlo & reference output drivers & logic fault timer 5v reference 26 4 1 10 clk osc sync + - 220mv pvdd mux mute mute 7 14 13 9 11 8 6 5 28 27 25 15 17 feedback amp error amp current sense input amp 16 24 23 22 21 20 s r q q clk 5v reference 18 shdn e e l l e e c c t t r r i i c c a a l l s s obsolete product not recommended for new designs
microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2002 rev. 1.0a, 10/21/2002 www. microsemi . com thermalmax ? lx1810 thermoelectric cooler drive controller ic p roduction d ata s heet integrated products notes db 28-pin shrink small outline package ssop error! not a valid link. *lead coplanarity note: 1. dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006?) on any side. lead dimension shall not include solder coverage. m illimeters i nches dim min max min max a 1.65 1.85 0.065 0.073 b 0.25 0.38 0.009 0.015 c 0.13 0.22 0.005 0.008 d 9.90 10.50 0.390 0.413 e 5.00 5.60 0.197 0.221 f 0.65 bsc 0.025 bsc g 0.05 0.21 0.002 0.008 h 1.73 2.00 0.068 0.078 l 0.65 0.95 0.025 0.037 m 0 8 0 8 p 7.65 7.90 0.301 0.311 *lc ? 0.10 ? 0.004 m m e e c c h h a a n n i i c c a a l l s s obsolete product not recommended for new designs
microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2002 rev. 1.0a, 10/21/2002 www. microsemi . com thermalmax ? lx1810 thermoelectric cooler drive controller ic p roduction d ata s heet integrated products notes product preview data ? information contained in this document is pre-production data, and is proprietary to linfinity. it may not be modified in any way without the express written consent of linfinity. product referred to herein is not guaranteed to achieve preview, preliminary or production status and product specifications, configurations, and availability may change at any time. n n o o t t e e s s obsolete product not recommended for new designs
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