LTI17A/LT317A al AR LM117/LM317 TECHNOLOGY ~~ Positive Adjustable Regulator FEATURES DESCRIPTION a Guaranteed 1% Qutput Voltage Tolerance The LT117A Series are 3-terminal positive adjustable = Guaranteed max. 0.01%/V Line Regulation voltage regulators which offer improved performance = Guaranteed max. 0.3% Load Regulation over earlier devices. A major feature of the LT117A is a Min. 1.5A Output Current the output voltage tolerance is guaranteed at a maxi- = 100% Burn-in in Thermal Overload mum of + 1%, allowing an overall power supply toler- ance to be better than 3% using inexpensive 1% resistors. Line and load regulation performance has been improved as well. Additionally, the LT 117A refer- APPLICATIONS ence voltage is guaranteed not to exceed 2% when op- erating over the full load, line and power dissipation = Wide Range Power Supplies conditions. The LT 117A adjustable regulators offer an # Constant Current Supplies improved solution for all positive voltage regulator re- = Voltage Programmable Supplies quirements with load currents up to 1.5 amps. Regulator with Reference Output Voltage Error 12 Vin LTSI7A 5V 11 | bi Your EF 10 + ~ 2 9 T 1 uF = 8 LM317 4 7 ~ wg L317 = 5 T3174, gS 4 {T1009 5 3 \T317A 2 2 L ' = 0 2 4 6810 20 40 100 OUTPUT VOLTAGE LI Wee 4-137LTT17A/LT317A LM117/LM317 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION Power Dissipation ..... ween : Internally Limited OTTOM VEW ORDER BOTTOM Vew ORDER Input to Output Voltage Differential .......... 40V i, PARTNO PART NO. Operating Junction Temperature Range ms eur FO LT117AK wo LT117AH LTV17A/LM117............ 55C to 150C case LT317AK (T317AH LT317A/LM317 0... 0C to 125C Seu EMG OT TH Storage Temperature Range oN ARACE LM117K sPACKAGE 317H LTVI7A/LM117.......0.0.- 65C to 150C ree LMST7K | rodeuentow LM LT317A/LM317............ 65C to 150C . Vn ORDER Lead Temperature (Soldering, 10 sec.)...... 300C O in, PART NO. PRECONDITIONING: , yO CASE IS 10.220 PLASTIC 100% THERMAL LIMIT BURN-IN OUTPUT ELECTRICAL CHARACTERISTICS (Sce Note 1) LT117A/LM117 LTI17A LM117 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Ver Reference Voltage lour = 10mA Ty = 26C 1.238 1,250 1,262. V iM s My - Your) 5 Oy @)} 1225. 1.250 4:270. 120 8=61.25 = 1.30 V MA < lout <!max, P< Pax eeaee AVour Line Regulation 3V < (Vin Vout) < 40V, (See Seis AVin Note 2) 0.005... 0.01 0.01 0.02 %/V el 0.01. 0.02 0.02 0.05 %/V AVourt Load Regulation TOMA < lout < Imax, (See Note 2) Alout Vour < 5V 5 15 5 15 mV Vour = 5V 0.1 0.3 0.1 0.3 % your < oy e a 0 50 mV out > e . . 1 % Thermal Regulation Ta = 25C, 20msec Pulse : 0.002 ...0:02 0.03 0.07 %/W Rippie Rejection Vour = 10V, f = 120Hz Caps = 0 e 65 65 dB Caps = 10uF @| 66 80 66 80 dB lapg Adjust Pin Current e 50 100 50 100 uA Alans Adjust Pin Current Change 10mA < four < Imax 2.5V < (Vin Vout) < 40V e 0.2 5 0.2 5 uA Inin Minimum Load Current (Vin Vour) = 40V e 3.5 5 3.5 5 mA Current Limit (Vin Vout) < 15V K Package @; 15 2.2 1.5 2.2 A H Package @; 05 0.8 0.5 0.8 A (Vin Vout) = 40V, T, = 25C K Package 0.3 0.5 0.3 0.4 A H Package 0.15 02 0.15 0.2 A AV Temperature Stability 5C < T, < + 150C 1 2. 1 % ATemp x T Long Term Stability Ta = 125C 0.3 1 0.3 1 % ATime e, RMS Output Noise (% of Voyr) Ta = 25C, 10H2 < f < 10kHz 0.001 0.001 % Gc Thermal Resistance H Package 12 15 12 15 C/W Junction to Case K Package 2.3 3 2.3 3 C/W 4-138 LY linereLT117A/LT317A LM117/LM317 LECTRICAL CHARACTERISTICS (See Note 1) UT317A/LM317 LTSI7A LM317 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Veer Reference Voltage lour = 10MA Tj = 25C 1.238 1.250 1.262 V 3V < (Vin Vo) < 40V @| 1225 1.250 1.270 1.20 125 130 V TOMA < lout <bmax, P < Prax Wout Line Regulation 3V < (Vin Vour) < 40V, (See : Vw Note 2) 0.005 0.01 0.01 0.04 %/V _ e . 001 0.02 0.02 0.07 %/V Wout Load Regulation 10mA < loyt < Imax, (See Note 2) out v<5V 5 5 5 25 mv Vo 2 SV 0.1 0.5 0.1 05 % Vo < 5V e 20 50 20 70 mV Vo 2 5V e 0.3 1 0.3 1.5 % Thermai Regulation Ty = 25C, 20msec Pulse e 0.002 0.02 0.04 0.07 %/W Ripple Rejection Vo = 10V, f = 120Hz Canj = 0 65 65 dB Cans = 10uF 66 80 66 80 dB laps Adjust Pin Current 50 100 50 100 pA Alapg Adjust Pin Current Change 10mA < lout < Imax 2.5V < (Vin Vour) < 40V e 0.2 5 0.2 5 pA Imin Minimum Load Current (Vin Vout) = 40V e 3.5 10 3.5 10 mA Current Limit (Vin ~ Vout) < 15V K and T Package @; 15 2.2 1.5 2.2 A H Package @; 05 0.8 0.5 0.8 A (Vin Vout) = 40V, Tj = 25C K and T Package 0.15 04 0.15 0.4 A H Package 0.075 02 0.075 0.2 A AVout Temperature Stability 0C < Tj < 125C 1 2 1 % ATemp . _Vout_ Long Term Stability Ta = 125C 03 { 03 1 % ATime ep RMS Output Noise Ta = 25C, 10Hz < f < 10kHz 0.001 0.001 % (% of Vour) jc Thermal Resistance H Package 12 15 12 15 C/W Junction to Case K Package 2.3 3 2.3 3 C/W T Package 4 5 4 C/W The @ denotes the specifications which apply over the full operating temperature range. Note 1: Unless otherwise specified, these specifications apply for Viy Vour = 5V; and lour = 0.1A for the TO-39 and lout = 0.5A for the TO-3 and T0-220 packages. Although power dissipation is internally limited, these specifications are applicable for power dissipations of 2W for the TO-39, and 20W for the TO-3 and T0-220. Imax is 1.5A for the TO-3 and TO-220 packages and 0.5A for the TO- 39. LI We Note 2: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Load requiation is measured on the output pin at a point 1% below the base of the K and H package and at the junction of the wide and narrow portion of the lead on the T package. 4-139LTII7ZA/LT317A LM117/LM317 TS Current Limit ; Load Regulation (TO-3 and TO-220 Package) Adjustment Current 0.4 3 65 | _ : _ 60 > S v r Tj = 25C to 58C 3 65 Pa louT= Ai = i= - bo TREE ON a ' | za a to : : a a 50 8 o2 1 & A | a = ' i o 5 x i . 1 > | 3 bal 5 i= 15000 A g 45 7 | 8 03 a a jy SN 5 / a po | 3 | = 40 = Vin = 15V P| 2 / 04 voy = 10V [ _ 35 a | | op LLL | 0 - L 75-50-25 0 25 50 75 100 125 150 0 10 20 30 40 -75 -25 25 75 125 TEMPERATURE INPUT-OUTPUT DIFFERENTIAL (V) TEMPERATURE (C) Dropout Voltage Temperature Stability Minimum Operating Current 4.0 1.270 5 AVout = 100 mw i 1 pop oy | = | | it | 4 az 25 (4 = 1.260 Ty = 150C a i i - a + mag 20 four = 1A_,_| 2 ps0 & a = LTT 8 Lo mY = A & ~~ lout = 500 ma # La" 8 2 - Cty =-55C = ee wi Pa 515 i = 1240 3 g ~ [| 1 | lout - 20 mA 1.0 a 1.230 0 7550-25 0 25 50 75 100 125 150 0-25 0 25 50 75 100 125 150 0 5 10 16 20 25 30 35 40 TEMPERATURE (C) TEMPERATURE INPUT-OUTPUT DIFFERENTIAL (V} Ripple Rejection Ripple Rejection (dB) Ripple Rejection 100 100 90 1 To] Gary = Capy = 10 uF AD = 80 ~N 80 80 = | = = g cio) = 0 3 S 70 3 60 3 60 = S : 5 5 F | y 60 wy 40 4 ty 40 uy z Vw ~ Your = 5V | E Ez 50 lout = 500 mA | = Vy = 18 20 F $= 120Hz ; 20 N 40 Vig = 15V | = 25C | Vout = 10V Vout = 10V = 2 Ij lout = 0.5A f=1 a ! 0 30 09 5 10 15 20 2 30 435 10 100 tk = 10k=s*100k~s 1M 0.01 0.4 1 10 OUTPUT VOLTAGE (V) FREQUENCY (Hz) QUTPUT CURRENT (A) 4-140 LI WARLT117A/LT317A LM117/LM317 a TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance 10 | 1 Cad = 0 _ | Cout Sf 0.1 }-4 / J, fr. Capy = 10 uF J 0.01 S / Cout = 10 uF I A 0.001 Vw= 1V Vout = 10V louT = 500 mA 1 1 = On _ OUTPUT VOLTAGE DEVIATION (V) ao o : | in i OUTPUT IMPEDANCE (OHMS) (_( a INPUT VOLTAGE CHANGE (V) a o S 0.0001 10 100 ik 10k 100k 1M 0 10 FREQUENCY (Hz} Line Transient Response TIME (us) Load Transient Response = =0 VouT = 10V = 0 Tj = 25C = 1yF, Caps = 10 pF ~ OUTPUT VOLTAGE DEVIATION (V) Q oOo wm ~_ an Vin = 1 Vout = 10V PRELOAD = mA Tj = 26C I | os 1 9 a on _ o LOAD CURRENT (A) S wn oO 20 30 40 0 10 20 30 40 TIME (1s) APPLICATIONS INFORMATION General: The LT117A develops a 1.25V reference volt- age between the output and the adjustable terminal (see Figure 1). By placing a resistor, R1, between these two terminals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally this current is the specified minimum load current of 5mA or 10mA. LT317A Vin Tt {IN OUT f Vout Ao VREF 2 Ry I nou | Lif Vout = VreF ( 1+ <2) + lapy Re = 1 50 uA > i Ro Figure 1 Because !apy is very smail and constant when com- pared with the current through R1, it represents a small error and can usually be ignored. It is easily seen from the above equation, that even if the resistors were of exact value, the accuracy of the output is limited by the accuracy of Vper. Earlier ad- justable regulators had a reference tolerance of + 4%. This tolerance is dangerously close to the + 5% sup- ply tolerance required in many logic and analog sys- tems. Further, many 1% resistors can drift 0.01%/C adding another 1% to the output voltage tolerance. For example, using 2% resistors and +4% toler- ance for Vper, calculations will show that the expected range of a 5V regulator design would be 4.66V < Voyr < 5.36V or approximately + 7%. If the same example were used for a 15V regulator, the ex- pected tolerance would be +8%. With these results most applications require some method of trimming, usually a trim pot. This solution is both expensive and not conducive to volume production. One of the enhancements of Linear Technologys ad- justable regulators over existing devices is tightened initial tolerance. This allows relatively inexpensive 1% Or 2% film resistors to be used for R1 and R2 while set- ting output voltage within an acceptable tolerance range. With a guaranteed 1% reference, a 5V power supply design, using +2% resistors, would have a worst case manufacturing tolerance of + 4%. If 1% resistors were used, the tolerance would drop to + 2.5%. A plot of the worst case output voltage tolerance as a func- tion of resistor tolerance is shown on the front page. LY Ungar 4-141LTI17A/LT317A LM117/LM317 For convenience, a table of standard 1% resistor val- ues is shown below. Table of 2% and 1% Standard Resistance Values 1.00 1.47 2.15 3.16 4.64 6.81 1.02 1.50 2.21 3.24 4.75 6.98 1.05 1.54 2.26 3.32 4.87 7.15 1.07 1.58 2.32 3.40 4.99 7.32 1.10 1.62 2.37 3.48 5.11 7.50 1.13 1.65 2.43 3.57 5.23 7.68 1.15 1.69 2.49 3.65 5.36 7.87 1.18 1.74 2.59 3.74 5.49 8.06 1.21 1.78 2.61 3.83 5.62 8.25 1.24 1.82 2.67 3.92 5.76 8.45 1.27 1.87 2.74 4.02 5.90 8.66 1.30 1.91 2.80 4.12 6.04 8.87 1.33 1.96 2.87 4.22 6.19 9.09 1.37 2.00 2.94 4.32 6.34 $9.31 1.40 2.05 3.01 4.42 6.49 9.53 1.43 2.10 3.09 4.53 6.65 9.76 Standard Resistance Values are obtained from the Decade Table by multiplying by multiples of 10. As an example, 1.21 can repre- sent 1.210, 12.10, 1210, 1.21KQ etc. Bypass Capacitors: Input bypassing using a 1,F tanta- lum or 25,F electrolytic is recommended when the in- put filter capacitors are more than 5 inches from the device. Improved ripple rejection (80 dB) can be ac- complished by adding a 10uF capacitor from the ad- just pin to ground. Increasing the size of the capacitor to 20,F will help ripple rejection at low output voltage since the reactance of this capacitor should be small compared to the voltage setting resistor, R2. For im- proved AC transient response and to prevent the pos- sibility of oscillation due to unknown reactive load, a 1uF capacitor is also recommended at the output. Be- cause of their low impedance at high frequencies, the best type of capacitor to use is solid tantalum. Protection Diodes: The LT117A/317A do not require a protection diode from the adjustment terminal to the output (see Figure 2). Improved internal circuitry oi Mion tT3I7A vi VW Not >"" ADJ i 100 pF t LK | + wb. VADS wT A2 NOT NEEDED Figure 2 4-142 Z eliminates the need for this diode when the adjustment pin is bypassed with a capacitor to improve ripple rejection. If a very large output capacitor is used, such as a 100uF shown in Figure 2, the regulator could be dam- aged or destroyed if the input is accidentally shorted to ground or crowbarred. This is due to the output ca- pacitor discharging into the output terminal of the reg- ulator. To prevent damage a diode D1 is recommended to safely discharge the capacitor. Load Regulation: Because the LT117A is a three-termi- nal device, it is not possible to provide true remote load sensing. Load regulation will be limited by the re- sistance of the wire connecting the regulator to the load. For the data sheet specification, regulation is measured at the bottom of the package. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the negative side of the load. Although it may not be immediately obvious, best load regulation is obtained when the top of the divider is connected directly to the case not to the load. This is illustrated in Figure 3. if R1 were connected to the load, the effective resistance between the regulator and the load would be R2 + Rt Rex (= Connected as shown, R, is not multiplied by the divid- er ratio. Rp is about 0.0040 per foot-using 16 guage wire. This translates to 4mV/ft at 1A load current, so it important to keep the positive lead between regulator and load as short as possible. . fo PARASITIC LIS17A LINE RESISTANCE VIN Vien Vout e Ay CONNECT | R1 TO CASE > Ri $ Sn , Ry = Parasitic Line Resistance. S Re \ 22 CONNECT R2 TO LOAD Connections for Best Load Regulation Figure 3 AAA, v IK LY WereTYPICAL APPLICATIONS 1.2V-25V Adjustable Regulator LTSi7A Vin Vin 2 Ngut > VouT ADJ RI 2432 + c1* ok C2t 7P tuk 1 1 pF 7 R2 5k . . . R2 +t Optional improves transient Vout = 1.25V ( 1+ =) response Ri * Needed if device is far from filter capactiors Remote Sensing Vw LES17A, Rp (MAX DROP 300mV) OUTPUT eos) Nour AN BV A Vn 7 _ {2 250 4 LM301A $ RL > $ 1212 g ka 1 > 8 3 a Sar J 3832 100pF $4 aA RET RETURN 20 2816 EEPROM Supply Programmer for Read/Write Control LT117A/LT317A LM117/LM317 Improving Ripple Rejection VIN Vn + By : 1yF T *(1 IMPROVES RIPPLE REJECTION Xc SHOULD BE SMALL COMPARED TO R2 5V Regulator with Shut Down BV Vw r Vout < [+ $ 1219 oT 1 uF 1k . Tm wret~ ensooa S| 3832 KS L 21V Programming Supply for UV PROM/EEROM Soo tata AA +2 Nees OE + S : : : : er ohh non , > [| J ep oo ATSITAN % +24V TI" > Our > TO Vpp oF Yeo 1 uF - ADS 3 ~ FEA bv T | q Temperature Compensated Lead Acid Battery Charger = $ 7500 nooo, Fama BYTE 5v aw > 1% : -LISI7B oc Vib f>} Ve our on 12 aw Pass ADs: ve READ rc > > NM- < 3.24k > 10k _* 2 39k 2432 > WRITE ; Fe $ 500 wy) C = ) ao Ore + a ~ ao oa >o___ 0% = > = { _ 2N3906 BYTE ERASE 18k Pom ALL GATES 7406 > CHIP ERASE 100k ; 50k ee LY WeLT117A/LT317A LM117/LM317 SCHEMATIC DIAGRAM LTV17A/LT317A 1 vn 310 ko 190 50 d2 160 ANN oe PACKAGE DESCRIPTION K Package TO-3 STEEL Metal Can 0 750-0.775 0325 0.350 (19.304 19.085) (8.255 6.090) 0.116 (2.948) wax nh 420-0490 4 to) SEATING PLANE {12.168 12,192) 0.038 0.043 ot _ th (0.965 1.092) 1.177 = 4.197 (20.896 30.404) 0.660-0.670 0.210-0.220 (16.764 17.018) (6.534 568) 0.168-0.178 7 azetasey 8M 2 MOUNTING HOLES 0.425-0.435 0.151-0.161 (10.785 11.049) 3835-4029) DA 0.490-0.510 (12.448 12.954) 117A 150C 35C/W | 3C/W 117 317A 125C =| 35 317 CW | 3Cw 2 56k 20k 019 $015 018 3k O16 ; 020 017 c1 305 pF 2.4k c2 30| pF 8.1k > 12k he T Package TO-220 Plastic 0.180 +0.005 ft one 0.151+0.002 (4.572 + 0.127) : : (3.835 + 0.051) 0.0502 0.002 Da 1127 0.051) 0.110+0.010 f senes (2.794 = 0.254) 0:2500.010, LL (6.35 + 0.254} | TAPERED 1, 2 SIDES omoz00w | #7 18.596 + 0.254) / Fe SEATING PLANE 1.020 + 0.015 toa sk 910. _ (25.91 + 0.381) 0.150 Xr (3.84) 0.540 + 0.015 (19.72 0.381) 0.410 {10.41} Aer B ta on 1008 th27) 0.032 + 0.005 +0254 0.100 0.010 | Garson eT ~0381 25420254) aos 720% 0.200 +0.010 TFhee (6.06 + 0.254) 0.381 _ 964 T; max. Oa Ie 317A 317 125C | 50C/W | SC/W {0.660 1.143) H Package 3-Lead Metai Can 0.350 0.370 bj {8.690 9,398} DA 0.305 0.335 | 0.1650.195 W747 8.509) (4.191-4.953) oe TT p= [hase 0.026 0.045 0.028 0.034 117A 117 317A 317 150C/W | 15C 150C/W | 18C/W 4-144 LY Wine