- Eau aI it Sia a ATION KI MA AXILM ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation General Description The MAX1729 micropower step-up/step-down DC-DC converter is ideally suited for electrically controlled bire- fringence (ECB) and liquid-crystal-display (LCD) bias- supply generation. It provides step-up/step-down voltage conversion and reduces output ripple by using a step-up DC-DC converter followed by a linear regula- tor. This architecture permits a physically smaller induc- tor than those used in competing SEPIC and flyback topologies. This device features low quiescent current (67HA typical). A logic-controlled shutdown mode fur- ther reduces quiescent current to 0.4UA typical. The MAX1729 features an input that dynamically adjusts the output voltage to control display color or contrast. It offers two feedback modes: internal and external. Internal feedback mode allows output volt- ages between 2.5V and 16V, and is specifically designed to hold temperature drift to +11ppm/C. External feedback mode allows the MAX1729 output voltage range to be tailored for various displays. An on-chip temperature sensor with a positive tempera- ture coefficient provides compensation for LCD/ECB display temperature characteristics. In internal feed- back mode, the buffered temperature sensor output is read and used to adjust the output voltage via a digital control signal. External feedback mode features an Features High-Accuracy Reference Voltage (41%) +11ppm/C Output Voltage Drift On-Chip Temperature Sensor Output -60etmhUCUc OmhlUO Accurate Voltage and Temperature Provide: Consistent ECB Colors Consistent LCD Gray-Scale Contrast Sd +2.7V to +5.5V Input Voltage Range Sd Output Voltage Range +2.5V to +16V in Internal Feedback Mode Programmable in External Feedback Mode Dynamic Control of the Output Voltage 67pA Supply Current 0.4pA Shutdown Current 10-Pin pHMAX Package (1.09mm max height) Evaluation Kit Available (MAX1729EVKIT) --f-.hUc Hh Oh O Ordering Information additional compensation method in which the tempera- PART TEMP. RANGE PIN-PACKAGE ture output is summed directly into the feedback net- MAX1729EUB 40C to +85C 10 uMAX work to provide first-order negative temperature compensation of the output voltage. The MAX1729 is available in the space-saving 10-pin UMAX package. Applications Typical Operating Circuit ECB Display Bias & Color Adjustment LCD Display Bias & Contrast Adjustment V Cellular Phones 2.7Vto 55V Personal Digital Assistants IN LX PS . . . GND ae Pin Configuration + mam | pep MANI729 of Vour TOP VIEW __ Pe eVto st6V DIGITAL = = NL 0} exo PWM >| CTLIN FB ro [2] AAAXLAA fo] ix CONTROLLER PL MAX1729 ~ rer [3 | 8] Ps ADC TC COMP cou [Hl Fy an | oc Fa. FB [5 | [6 | CTLIN = = uMAX MAXLAA Maxim Integrated Products 1 For free samples & the latest literature: http:/www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. 6cLLXVWMAX1729 ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation ABSOLUTE MAXIMUM RATINGS IN to GND 0 ener snnneeeneenenncreel -0.3V to +6V Operating Temperature Range LX, PS, OUT to GND...........c:ccssssecceceeseessssnseseeeneeeess -0.3V to +20V Junction Temperature... CTLIN, FB, REF, COMP, TC to GND ...........-0.3V to (VIN + 0.3V) Storage Temperature Range LX tO PS woe cece ences sceennsoeseenewenteanes -20V to +1.0V Lead Temperature (soldering, 10sec) LX, PS, OUT Current ........c:ccccccccccceesssssssssececeeeeesessssssaseneeess 60mA Continuous Power Dissipation (Ta = +70C) 10-pin pMAX (derate 5.6mW/C above +70C)........... 444mw Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = +3V, CTLIN = IN, FB = GND, Ta = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX | UNITS Operating Voltage Range VIN 2.7 5.5 Vv eee a Mo 20 26 |v IN Supply Current IN 37 50 pA PS Supply Current IPS 30 40 pA Shutdown Supply Current ISHDN CTLIN = GND, ISHDN = IIN + IPS 0.4 2 pA TA = +25C 1.215 1.228 1.241 Reference Output Voltage VREF IREF = 0 Ta= 40C to +85C 100 1 356 Vv . Vout FB = GND, CTLIN = TA = 0C to +85C 2.35 2.45 2.5 Minimum Output Voltage 0.1% duty cycle, Vv (MIN) | IouT=0to0.5mA | TA=-40C to 485C | 2.35 2.52 Maximum Output Voltage oo louT = 0 to 0.5mA 16 16.40 Vv FB= GND, CTLIN= | Ta = 0C to +85C 13.90 13.95 14.00 CTLIN to VouT Gain 0.1% to 100% duty V/A00% cycle, louT = 0 TA = -40C to +85C 13.60 14.20 TA = 0C to +85C +11 +30 Temperature Coetticient TCouT | Vps= +18V (Note 3) - = -40C to 485C +18 +65 ppm/C Maximum Output Current IOUT 0.5 2.5 mA TC Output Voltage Vic TA = +25C 1.178 1.228 1.278 Vv TC Output Temperature TA = 0C to +85C 15.5 16.5 175 Coefficient (Note 3) TCTC Ty 40C to 485C 45. 165 185 | YS TC Output Current Itc +50 HA Feedback Set Voltage (FB) Veg AA #28C ters 128 Fey Ta = -40C to +85C 1.200 1.256 FB Mode Threshold VMODE 90 122 150 mV FB Bias Current IFB VeB = +1.25V 5 50 nA . VIN = +5.5V 2 CTLIN High Voltage VIH Vv VIN = +2.7V 13 MA AXIAAECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation ELECTRICAL CHARACTERISTICS (VIN = +3V, CTLIN = IN, FB = GND, Ta = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) 6cLLXVW PARAMETER SYMBOL CONDITIONS MIN TYP MAX | UNITS CTLIN Low Voltage VIL VIN = +2.7V to +5.5V 0.4 Vv CTLIN Bias Current HL VIN = +5.5V, CTLIN = GND or IN +1 HA VeB = 0, Internal Feedback Mode 33 kQ COMP Impedance RcompP VeB = +1.25V, External Feedback Mode 60 150 Q CTLIN Minimum Pulse Width for Shutdown tOFF (Note 4) 700 1250 2400 ys CTLIN Minimum Pulse Width t 25 ns for Vout Control CTLIN COMP Rise/Fall Time tRtF VeFB = +1.25V 20 ns Switch On-Resist R ILx = 30mA VIN = +2.7V 25 5.0 Q witch On-Resistance = 30m a ON Lx VIN = +5.5V 15 Switch Off-Leakage Current ILX(OFF) | VLX= 18V 0.1 1 pA LX to PS Diode Forward Voltage VLxXPs | IDIODE = 30mA 700 970 mV Ta = +25C 6 8 10 PFM On-Time Constant K V-ys TA = -40C to +85C 5 11 PS to OUT Voltage (Note 5) 0.4 0.6 1.0 Vv Note 1: Specifications to -40C are guaranteed by design, not production tested. Note 2: When Vin is below this level, the boost and LDO outputs are disabled. Note 3: Guaranteed by design. Note 4: Minimum time to hold CTLIN low to invoke shutdown. If CTLIN is held low for less than toFF, device does not enter shutdown. Note 5: Switching regulator regulates this voltage to keep LDO from dropping out. MA AXIAMA 3MAX1729 ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation (Circuit of Figure 2, Ta = +25C, unless otherwise noted.) EFFICIENCY (%) MAXIMUM OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) EFFICIENCY vs. OUTPUT CURRENT Vout = 9.4 (CTLIN AT 50% DUTY CYCLE) 60 MAX1729 toc 01 50 40 30 20 0.01 04 1 10 QUTPUT CURRENT (mA) MAXIMUM OUTPUT CURRENT vs. SUPPLY VOLTAGE 6 Vout =+2.5V 2 Vout = 16.4V 1 0 25 30 35 40 45 50 SUPPLY VOLTAGE (V) 55 6.0 OUTPUT VOLTAGE vs. DUTY CYCLE toc 07 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE (%) 60 50 40 30 EFFICIENCY (%) 20 -20 -40 PSRR (dB) -60 -80 -100 VeTLIN 5V/div VREF 1Vidiv Vice 1Vidiv Vout 10V/div EFFICIENCY vs. OUTPUT CURRENT Vour = 16.4 (CTLIN= IN) ag MAX1729 toc 02 Vin=2.7V fs Vin =5.5V 0.01 01 1 10 OUTPUT CURRENT (mA) PS TO OUT (LDO) POWER-SUPPLY REJECTION RATIO MAX1729 toc 05 10 100 1k FREQUENCY (Hz) 10k 100k START-UP DELAY FROM SHUTDOWN MAX1729 toc 0 20ms/div 0.40 0.35 0.30 SUPPLY CURRENT (mA) o fs Ss 2 sos oa 8S B Q 2 a 3.0 25 2.0 SHUTDOWN CURRENT (1A) a VeTLIN 5V/div VREF 1Vidiv Vice 1Vidiv Vout 10V/div Typical Operating Characteristics NO-LOAD SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX1729 toc 03 VouT = 16.4V Vout =9.4V Vout = 2.5V 25 30 35 40 45 50 55 60 SUPPLY VOLTAGE (V) SHUTDOWN SUPPLY CURRENT J / MAX1729 toc 08 / A YY Z a a 30 35 40 45 50 INPUT VOLTAGE (V) 55 60 DELAY TO SHUTDOWN pe Vin =5V Io=0.5mA MAX1729 toc 09a 500ms/div MAXUMECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation (Circuit of Figure 2, TA = +25C, unless otherwise noted.) DELAY TO SHUTDOWN HEAVY LOAD MEDIUM LOAD | AAA ASE A A.A. | VoTuN : Ss uf 4} / i f \ fe IL \ \ : fs \ g 5V/div : aaj? 2OmAdv YP / VV van 20mA/div \ nae An / youd ive oureut : , OUTPUT ne : argornght on gh gs RIPPLE ptt tee te ete Anette Nr portend es raat : RIPPLE ht Ph tg ang ng | tomVidiv ei Stee ] acon : 1Omvidiv Vic \ : . . . 1Vidiv ee i a Ia: | : Vix | | : i Vix | mie Vout ot Viy=5V BVidiv : BVidiv i i/\ i 10Vidiv : Ip=0.5mA | _ Uy f H\ VV 5ms/div 2us/div 2usidiv LOAD-TRANSIENT RESPONSE LINE- TRANSIENT RESPONSE : CTLIN-IN_ [2 ys = 16.404 lout=0.5mA |S Vour | 7 OF 2 Vout 3 20mVidiv | | 20mVidiv peri Aeyrutontceat Heya wig et 16.400 Nel Sere pny : scan BOO UA 1Vidiv wedclpah av lout | oL | 250uAdiv : : 20uA MA AXIAMA SWITCHING WAVEFORM S SWITCHING WAVEFORMS Typical Operating Characteristics (continued) ims/div 2ms/div 6cLLXVWMAX1729 ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation Pin Description PIN NAME FUNCTION 1 IN Supply Input. Bypass with 0.1pF capacitor to ground. Connect to supply side of inductor (L1). 2 TC Temperature-Sensor Output. Bypass to GND with a 1000pF capacitor. 3 REF Reference Voltage Output. Bypass to GND with a 0.1pF capacitor. 4 COMP Compensation Pin. In internal feedback mode (Figure 2), bypass with a 1pF capacitor. In external feedback mode, COMP is a buffered inverse version of CTLIN (Figure 3). 5 FB Feedback and Mode Control Input. Connect to GND for internal feedback mode operation. 6 CTLIN Control Input. Drive low for more than 1.2ms to put the device into shutdown. 7 OUT Bypass to GND with a 1.0uF capacitor. 8 PS Output of boost converter and input to LDO. Bypass to GND with a 0.068pF capacitor. 9 LX Drain of the internal MOSFET Switch 10 GND Ground Detailed Description The MAX1729 is designed to provide bias voltage for ECB or LCD displays. It is composed of a step-up DC-DC converter followed by a linear regulator (Figure 1), a combination that provides step-up/step- down voltage conversion while minimizing output rip- ple. The device allows you to adjust a displays color or contrast by dynamically adjusting the MAX1729s out- put voltage using a PWM control signal. In internal feedback mode, the output voltage is adjustable between +2.5V and +16V. In external feedback mode, the output voltage is adjustable, and its range is set by a resistor network that is programmed to match the out- put voltage range of LCD/ECB displays needing a max- imum output up to +18V. Boosi Converter The MAX1729s DC-DC boost converter is implemented with an on-chip N-channel MOSFET, a diode, and an error comparator. The ICs unique PFM control system varies the on-time and off-time of the switch based on the boost converters input and output voltage values, as fol- lows: t K ON = V Vin K lore 2 W777 Ves Min where K is typically 8V-us. This timing maintains discon- tinuous conduction and sets the peak inductor current (IPEAK) to: K DEAK = L where L is the inductance of L1 (Figures 2, 3, and 4). When the error comparator detects that the drop across the linear regulator (VPs - VouT) is less than approximate- ly 0.6V, the internal switch is turned on (ton initiates) and current through the inductor ramps to IPEAK. At the end of ton, the switch is turned off for at least tofF, allowing the MAXUMECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation IN | LX TC TEMPERATURE BOOST SENSOR CONVERTER | PS. REF VOLTAGE UNeRR REFERENCE REGULATOR MAX | | OUT FB _ MAKIZ29 FEEDBACK CONTROL womnv4~t< SC HC SHUTDOWN CONTROL CILIN GND COMP NOTE: SWITCH STATES SHOWN FOR INTERNAL FEEDBACK MODE. Figure 1. Internal Block Diagram inductor current to ramp down and Vps to increase. If, at the end of torr, VPs - VOUT is still too low, then another ton is initiated immediately. Otherwise, the boost con- verter remains idle in a low-quiescent-current state until Vps - VouT drops again and the error comparator initi- ates another cycle. Linear Regulator The PNP low-dropout linear regulator of the MAX1729 regulates the boost-converter output to the desired out- put voltage. The boost converters regulation circuitry holds the linear regulators input voltage (VPs) approxi- mately 0.6V above the output voltage to keep the regu- lator out of dropout, thereby enhancing ripple rejection. The linear regulator incorporates short-circuit protec- tion, which limits the output current to approximately 6mA. Temperature Sensor Output The MAX1729 generates a temperature sensor voltage (VTc) that varies at 16.5mV/C (typ) and is nominally MA AXLMA equal to the reference voltage at room temperature. TC is capable of sinking or sourcing 50yA. This output is used to compensate for ECB color or LCD contrast variations caused by changes in temperature. It may be read with an ADC and used to modify an external PWM control signal or, in external feedback mode, summed directly into the feedback-resistor network. Control Signal An externally generated PWM control signal on CTLIN controls VouT in internal feedback mode and influ- ences VouT in external feedback mode. In either mode, if CTLIN is held low for longer than 1.24ms, the MAX1729 enters shutdown mode, decreasing the sup- ply current below 2uA. Shutdown mode limits the mini- mum duty cycle and frequency that may be used to keep the device active. CTLIN frequencies between 2kHz and 12kHz are recommended. Internal Feedback Mode In internal feedback mode, the signal at CTLIN is inverse- ly buffered, level-shifted, and output at COMP through a resistor. Internal resistance (33kQ typical) and C6 then fil- ter the signal before it is used by the internal feedback network to set Vout. If temperature compensation is used, the temperature sensor output voltage is read by an ADC and used to adjust the duty cycle of the PWM control signal. See the Designing for Internal Feedback Mode section for more information. External Feedback Mode In external feedback mode, the output voltage of the MAX1729 is controlled by the duty cycle of the PWM control signal and an external resistor network, as shown in Figure 3. In this mode, the signal at CTLIN is inverted, level-shifted, and presented directly to COMP. R3, R4, and C6 filter the signal, before it is summed into the feedback node. Design Procedure Designing for Internal Feedback Mode For a 3kKHz PWM control signal use a 1p1F low-leakage ceramic capacitor for C6. For applications requiring a higher-frequency PWM control signal, reduce the value of C6 to between 1pF and 0.22uF for frequencies between 3kHz and 12kHz. Higher C6 values reduce output ripple. In Figure 2, VouT is governed by the fol- lowing equation: VouT = VOUT(MIN) + Duty Cycle - Gain where VOUT(MIN) is 2.45V and Gain is nominally 13.95V/100%, as listed in the Electrical Characteristics. 6cLLXVWMAX1729 ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation To use a DC control signal to adjust the output voltage, use the circuit shown in Figure 4. In this configuration, VOUT is governed by the following equation: Vout ~ 24.67Veg - 22.71Vooyp The impedance looking into COMP is nominally 33kQ. A source output impedance of less than 500Q is rec- ommended. Also, ensure VouT < 18V by keeping Vcomp above 0.6V. Designing for External Feedback Mode To solve for VouT in external feedback mode, assume the current into the FB pin is zero and the voltage at FB is 1.228V. Then take the sum of the currents into FB and solve for VOUT: 14. 4 04 Vor = Rt f+ jy OUT (twtr) FB Ri Ri - (a S ; =| Vcomp ~ (2) Vic Using the following formulas, calculate the external component values required for MAX1729 operation in external feedback mode, as shown in Figure 3. An example follows the formulas. External Component Value Formulas 1) Given the maximum output voltage needed (Vmax), choose the maximum feedback current and solve for Ri (10pA to 30pA is recommended for maximum feed- back current) as follows: Ri = Vax ep Ep u v1 N 20H C1 [ IN =] PS Ome tao Fe = T 0 MAAXLAN MAX1729 REF OUT Vout c3_T ] OA 7 PWM ~ GENERATOR > CTLIN FB RS @ 2 i Figure 3. External Feedback Mode Li VIN 220uH Ct N LX PS ar GND MAXIM ner MAX1729 out 0.068uF HH Vout ; c3_L | O4pF TT H ze DIGITAL PWM CONTROLLER cee C5 1000pF CTLIN FB IHH iH Figure 2. Internal Feedback Mode 8 u Vin - 220uH eo IN LX cr Pg uF $f ono PL ce =| maxim | per MAX1729 out c3_T ] O1pF TT CTLIN FB oan TC COMP cs | INPUT ~ = Figure 4. Using a DC Control Signal MAXUMECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation 2) Given the maximum output voltage (VMAX) and mini- mum output voltage (VMIN), calculate values for R3 and R4 as follows: 1/2 [* _ Vep Vwax WIN R3 R4 = R38 3) For first-order temperature compensation, calculate R5 as shown below. (If temperature compensation is not used, leave R5 open.) ns = 16.5mV/C Tempco where Tempco is the negative temperature coefficient needed to compensate the ECB or LCD display for changes in temperature. 4) Solve for Vcomp. The duty cycle used here corre- sponds to the duty cycle that yields the maximum out- put voltage, not including first-order temperature compensation. Ra R3+ R4 where a 90% duty cycle corresponds to Duty Cycle = 0.9. 5) Use the results from the above calculations to solve for R2. (For applications not utilizing temperature com- pensation, use 1 / R5 = 0.) _ 1 (et Mowe. VcomMP ro - [uy Cycle - 1 R2 V,\| Rt R38 RS 1.4104 R1 R35 External Component Value Example The example application requires the output voltage to adjust between 5V and 10V, using the circuit shown in Figure 3. The device in our example needs a tempera- ture coefficient of 383mV/C, which yields the following results. 1) VMAx = 10V and IrFp = 29.24UA is within the limits and yields a reasonable resistor value, therefore: Ry = 10V=1.228V _ aqQK0 29.24uA MA AXIAMA 2) VMAX = 10V and VMIN = 5V, therefore: 300kQ 5V R38 = v2 [ ) 1.228 = 36,8400 with R3 = 36.7kQ, then VMIN = 5.019V. Let R4 = R3 = 36.7kQ. 3) Tempco = 33mV/C, therefore: _ 300kQ | 16.5mV/C = 150kQ 33mV/C 4) If external circuitry limits the duty cycle to 90%, the following equation is true: 0.9 5) Solving for R2: 1 _ {Mout , Mcome , rp |) 1 Ro Rt RS RB | Veg 1 1 4 ) (x R38 R5 1 56560 With R2 = 56kQ, a duty cycle of 87.4% generates a VouT of 10V. Component Selection Inductors Use a 220uUH inductor to maximize output current (2.5mA typical). Use an inductor with DC resistance less than 10Q and a saturation current exceeding 35mA. For lower peak inductor current, use a 470UH inductor with DC resistance less than 20Q and a satu- ration current over 18mA. This limits output current to typically less than 1mA. See Table 1 for a list of recom- mended inductors. The inductor should be connected from the battery to the LX pin, as close to the IC as pos- sible. Capacitors The equivalent series resistance (ESR) of output capac- itor C2 directly affects output ripple. To minimize output ripple, use a low-ESR capacitor. A physically smaller capacitor, such as a common ceramic capacitor, mini- mizes board space and cost while creating an output ripple thats acceptable in most applications. Refer to Table 2 for recommended capacitor values. 6cLLXVWMAX1729 ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation Table 1. Recommended Inductors SUPPLIER PART INDUCTANCE (HH) DC RESISTANCE (Q) SATURATION CURRENT (mA) MAX HEIGHT (mm) Murata LQH3C221K04MO00 220 8.4 70 2.2 Panasonic ELT3KN115B 470 19 40 1.6 Table 2. Recommended Capacitor Values CAPACITOR CAPACITANCE (HF) C1 0.1 c2 0.068 C3 0.1 C4 1 cs 1000pF Cc* 1 *Use a low-leakage capacitor. Applications Information PC Board Layout Considerations Proper PC board layout minimizes output ripple and increases efficiency. For best results, use a ground plane, minimize the space between C1, C2, and GND of the MAX1729, and place the inductor as close to LX and IN as possible. For an example of proper PC board layout, refer to the MAX1729 Evaluation Kit. Chip Information TRANSISTOR COUNT: 1154 10 MAXUMECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation DP 002 ID PIN 0.020} } = A HHH -| keb Al AT Di FRONT VIEW NOTES: 1, D&E DO NOT INCLUDE MOLD FLASH. 3. CONTROLLING DIMENSION: INCHES INCHES | MILLIMETERS DIM| MIN | MAx [| MIN | MAX A | 0.037] 0043] 0939] 1.092 Ail | 0.002 | 0.006 | 0.051 | 0.152 A2| 0.030 | 0.038] 0.762| 0.965 Di[ 0112 | 0.124 | 2.945] 3.150 D2| 0110 | 0.122 | 2.794] 3.099 E1| o1t2 | 0124 | 2845] 3.150 Ee] 0110 | 0122 | 2.794] 3.099 E | 0.185] 0201 | 4699] 5.105 L [0.0155 [0.0275] 0.394| 0.699 Li |0.037_REF 0.940 REP b | 0.007 | 0.0106] 0.177 | 0270 e | 0.0197 BSc [ 500 BSC c | 0.0035] 0.0078 | 0.090 | 0.200 S | 0.0196 REF | 498 REF a lo [6 o [6 GAGE Ee PLANE SIDE VIEW 2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 15mm.006%), Li It LT SVIAAIL/VI PROPRIETARY INFORMATION TITLE: PACKAGE O APPROVAL UTLINE, 10L_ MICRO MAX Na. REV DOCUPENT CONTROL 1 21-0061 B A MA AXIAMA 1OLUMAXB.EPS Package Information 11 6cLLXVWMAX1729 ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation NOTES 12 MAKUM