LTC1044CN8 LINER | Alldatasheet
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{ y LINt AR LTC1044/7660 TECHNOLOGY Switched Capacitor Voltage Converter FEATURES DESCRIPTION = Plug-In Compatible with 7660 with These Additional The LTC1044 is a monolithic CMOS switched capacitor Features: voltage converter which is manufactured using Linear © Guaranteed Operation to 9V, with No External Technology's enhanced LTCMOS™ silicon gate process. Diode, Over Full Temperature Range The LTC1044 provides several voltage conversion func- © Boost Pin (Pin 1) for Higher Switching Frequency tions: the input voltage can be inverted (Vout = —Vin), © Lower Quiescent Power doubled (Vout =2Vin), divided (Vout = Vin /2) or multi- © Efficient Voltage Doubler plied (Vout = + nVin). : one in Goo (Grout Wotage Goneatien Designed to be pin-for-pin and functionally compatible Efficiency. with the popular 7660, the LTC1044 provides significant = 95% Min. Power Conversion Efficiency Taare improvements oval be in oon = Wide Operating Supply Voltage Range, 1.5V to 9V se improvements include: full 1.5V to 9V supply op- = Easy to Use eration over the entire operating temperature range, with- = Commercial Device Guaranteed Over — 40°C to on the need for external protection diodes; 2% times 85°C Temperature Range lower quiescent current for greater power conversion effi- ciency; and a ‘‘boost’’ function which is available to raise APPLICATIONS me act peainatr frequency to optimize performance = Conversion of +5V to +5V Supplies plications. 5 | ™ Precise Voltage Division, Vout =Vin /2 + 20ppm Although the LTC 1044 provides significant design and = Voltage Multiplication, Vout = +nVin performance advantages over the earlier 7660 device, it = Supply Splitter, Vout = +Vs/2 still maintains its compatibility with existing 7660 designs. LTCMOS™ js a trademark of Linear Technology Corp. SS Supply Current vs Supply Generating CMOS Logic Supply from 2 Mercury Batteries Voltage 400 wt tT TT TTT Tey ow Co vay get tttltttyr CIS soy = ry ae , sy — 3 200 SRR ee Go z NETWORK Fa 160 TTT REY Li peniuifydoce SUPP CURRENT = 39d , = 2 eLEL eee oL LET TT TT TI 012 3 4 5 6 7 8 9 0 ‘SUPPLY VOLTAGE, V+ (V) SS LT Wye 5-9
Notes 1 and 2) ( ) TOP VIEW ORDER PART NUMBER Input Voltage on Pins 1, 6 and 7 “ Output Short Circuit Duration LTC1044MH Operating Temperature Range cap cap+ [2] [7] osc LTC1044CJ8 snouno Fw LTC1044CN8 cw-[H] FI vour LTC1044MJ8 HERMETIC DIP J8 PACKAGE PLASTIC DIP NB PACKAGE Dal ELECTRICAL CHARACTERISTICS V+ =5V, T,=25°C, Test Circuit Figure 1, unless otherwise specified. LTC1044M LTC1044C Is Supply Current R= 09, Pins 1 and 7 No Connection 60 200 60 200 vA R= 00, Pins 1 and 7 V* =3V 20 20 pA V7 Winimu Supply Votage [R=Tok Sid SCC BC V4 | Maximum Supoy Voge [R= Tox Woe ite Rout Output Resistance 1, =20mA, fosc=5kHZ 100 100 Q 150 130 Q V+ =2V, 1 =3mA, fosc = 1kHz 400 325 a fosc Oscillator Frequency Cosco = 1pF (Note 4) Vt=5Vv 5 5 kHz Vt=2v 1 1 kHz Fox | Power etcensy [RL =Sfp=ome SSC SCS Vourerr | Voltage Conversion RL = 900 97 99.9 97 99.9 % Efficiency lose Oscillator Sink or Source | Vosc=OV or V* Current Pin 1=0V 3 pA Pin 1=V* 20 pA The @ denotes the specifications which apply over the full operating Note 3: The LTC1044 is guaranteed to operate with alkaline, mercury or temperature range. NiCad QV batteries, even though the initial battery voltage may be slightly Note 1: Absolute Maximum Ratings are those values beyond which the higher than 9.0V. life of the device may be impaired. Note 4: fogc is tested with Cogc = 100pF to minimize the effects of test Note 2: Connecting any input terminal to voltages greater than V* or fixture capacitance loading. The 1pF frequency is correlated to this less than ground may cause destructive latch-up. it is recommended that 100pF test point, and is.intended to simulate the capacitance at pin 7 no inputs from sources operating from external supplies be applied prior when the device is plugged into a test socket and no external capacitor is to power-up of the LTC 1044. used. Ce mannan
TYPICAL PERFORMANCE CHARACTERISTICS using test circuit shown in Figure 1) Operating Voltage Range vs Power Efficiency vs Oscillator Output Resistance vs Oscillator Temperature Frequency Frequency 10 100 500 Pt i tT tt A TM TM =2eT 9 98 Ht. Ta= 25°C, = ato Te meric | CITI IIT ol Sj, P PP ey tee Tien NTT | SUNT CN | yep tt tty te, a St en La A BEEEEECH Eee CO al a Ee fe Ve a CT ee BLEEP rrr) ete cum in MW KUTIN TTI | i A 981011 0 gS \\ oe oe oe | 2 HiT ea eS Riimmaii o Lt tT | tt | ao ALT ETI Vil 3 A * ~ EMBIENT TEMPERATURE. 72-0) " ‘0 OSCILLATOR FREQUENCY, toe (2) ‘00 i OSCILLATOR FREQUENCY: hag) = Power Conversion Efficiency vs Power Conversion Efficiency vs Output Resistance vs Supply Load Current for V+ =2V Load Current for V+ =5V Voltage 100 = 10 100 = 100 1000 —>— + ee Nees Se g N 28 y Ze BECCA CE REA FEROS & Z 25 Z a2LUNI LTR | 250 5s oo a ee a rN sol 1 Vel Is aap Vel NT) [8s @° SSeS gy ptIA TP yee. A Pe § ER SES aap ZT eee 8 eee 20 2 = 20 3 Cr B41 Tt, piA oe © A 7” A ‘LOAD CURRENT, I, (mA) ’ ° ° ita cURRENT 1 oo @ ot ever L FV (mA) ‘SUPPLY VOLTAGE, V+ (V) Output Voltage vs Load Current Output Voltage vs Load Current Output Resistance vs for V+ =2V for V+ =5V Temperature 25 5 v 400 A} ORS) Se BE sit 3 HEB He em +++ 14 s1 LIN 1 eat lt 3 m0 |] goof fl TINT TTT) ge g pt ee oft PN TT =e Tira) @aeer Bos Hy s.-] 7 TPIT TT) 3,6 Pr rr | ais LL | aL Lt | oo |p | cole | | TT TT “LAL PTT ott | | tT | as_L_L TTT TT TT IA tT TTP TTT ao. i | | | [4 o 12 3 4 5 6 7 8 9 10 0 10 20 30 40 50 60 70 80 90 100 -55 -25 0 2% SO 75 100 125 LOAD CURRENT, i, (mA) LOAD CURRENT, |, (mA) AMBIENT TEMPERATURE (°C). eS LT NEAR 5-11
TYPICAL PERFORMANCE CHARACTERISTICS (using test circuit shown in Figure 1) Oscillator Frequency as a Oscillator Frequency vs Supply Oscillator Frequency vs Function of Cosc Voltage Temperature = CARS a= 28°C a ee ee ee ee lS s voc LTT 0 ea a A 2 «UC 8 ERASE og | NET i s aoe 6s CT TZ | TT TT) | oe’ NTT So COICO) 3 SSS ETT NTL 3” Se SS a tied a ee B37 CLL ee Eat Fa] |S CU iA, OE PEP s_t TTT TT | 1 10 100 1k 10k 0123 4 5 6 7 8 9 10 =55 -2 0 2 80 75 100 125 EXTERNAL CAPACITOR (PIN 7 TO GROUND), Cosc (oF) SUPPLY VOLTAGE, V+ (V) AMBIENT TEMPERATURE (°C) TEST CIRCUIT ven ~ I. 2] o om ct = tre104a = ' OSCILLATOR, |. 10 pF (3 La BH Vou = =! ~ “ho = 02 i a FP 10uF I Figure 1 A APPLICATIONS INFORMATION Theory of Operation To understand the theory of operation of the LTC1044, a _f the switch is cycled f times per second, the charge review of a basic switched capacitor building block is ‘ansfer per unit time (i.e., current) is: helpful. |=fx Aq=fxC1(V1—-V2). In Figure 2, when the switch is in the left position, capacitor C1 will charge to voltage V1. The total charge on vt va C1 will be qi =C1V1. The switch then moves to the right, ‘ discharging C1 to voltage V2. After this discharge time, AL the charge on C1 is q2=C1V2. Note that charge has a c been transferred from the source, V1, to the output, V2. IT Tr a5 The amount of charge transferred is: Aq=q1 —q2=C1(V1—V2). Figure 2. Switched Capacitor Building Block eS 5-12 LT Wye
of more benefit than the paralleling circuit shown. Paralleling for Lower Output Resistance cies and the vottage step-up ratio. Figure 9. Ultra Precision Voltage Divider Figure 10. Battery Splitter
Figure 11. Paralleling for Lower Output Resistance Figure 12. Stacking for Higher Voltage
2002 J ie (+ 10V)) pio —_ Sok
Figure 13. Voltage Tripler /Quadrupler
Figure 14. Low Output Impedance Voltage Converter
1.2 ZERO ] 1
Figure 15. Single 5V Strain Gauge Bridge Signal Conditioner
Figure 16. Regulated Output +3V to +5V Converter
22219 Vour=5¥
4 EVEREADY €-91 CELLS = 6V al i} LOAD
0.012 AQUUST Vororour AT tmA=1mv
Figure 17. Low Dropout 5V Regulator = Voropaut AT 100mA =95mV
a PACKAGE DESCRIPTION H Package J8 Package Metal Can 8 Lead Hermetic DIP 0355-0570, poo (8.017. iy 398) 774309) issea-r87% a ie “ sme =] OL tame Ca ae ee ‘sus agraeou ~e 1.143) Waa” we Te JL. & esa esa opu-s00 0200-0320 dae move oe (7.386—8.128) TWSULATING STANDOFF NOTE: DIMENSIONS IN INCHES (MILLIMETERS) UNLESS OTHERWISE NOTED NOTE: DIMENSIONS IN INCHES (MILLIMETERS) “LENDS WITHO 0.057 OF TRUE POSTION (TP) AT GAUGE PLANE 150°C 150°C/W | 45°C/W Na Package 150°C 100°C/W
8 Lead Plastic
C etie=r02) 0.370—0.400 = ass ;* 10.16) ae ras _| “0 amas) 1753.02) (eset 3.683) a \\ say coro. a200-0310 TP ead 7.366=7.874) NOTE: DIMENSIONS 1M NCHES (WILUMETERS) UNLESS OTHERWISE NOTED “LEADS WITHIN 0.007 OF TRUE POSITION (TP) AT GAUGE PLANE 130°C/W ee 5-20 LT WAR