TS507 High precision rail-to-rail operational amplifier Datasheet - production data Applications Pin connections (top view) • Battery-powered applications • Portable devices OOuuttppuutt 11 55 VVCCCC • Signal conditioning • Medical instrumentation VVDDDD 22 NNoonn IInnvveerrttiinngg IInnppuutt 33 44 IInnvveerrttiinngg IInnppuutt Description SOT23-5 The TS507 is a high performance rail-to-rail input/output amplifier with very low offset voltage. This amplifier uses a new trimming technique that NN..CC.. 11 88 NN..CC.. yields ultra low offset voltages without any need for external zeroing. IInnvveerrttiinngg IInnppuutt 22 __ 77 VVCCCC NNoonn IInnvveerrttiinngg IInnppuutt 33 ++ 66 OOuuttppuutt The circuit offers very stable electrical characteristics over the entire supply voltage VVDDDD 44 55 NN..CC.. range, and is particularly intended for automotive and industrial applications. SO-8 The TS507 is housed in the space-saving 5-pin SOT23 package, making it well suited for battery- powered systems. This micropackage simplifies Features the PC board design because of its ability to be placed in small spaces (external dimensions are • Ultra low offset voltage: 25 µV typ, 100 µV max 2.8 mm x 2.9 mm). • Rail-to-rail input/output voltage swing • Operates from 2.7 V to 5.5 V • High speed: 1.9 MHz • 45° phase margin with 100 pF • Low consumption: 0.8 mA at 2.7 V • Very large signal voltage gain: 131 dB • High-power supply rejection ratio: 105 dB • Very high ESD protection 5kV (HBM) • Latchup immunity • Available in SOT23-5 micropackage • Automotive qualification March 2013 DocID10958 Rev 6 1/20 This is information on a product in full production. www.st.com 20

Contents TS507 Contents 1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Application note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.1 Out-of-the-loop compensation technique . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 In-the-loop-compensation technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1 SOT23-5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.2 SO-8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 DocID10958 Rev 6

TS507 Absolute maximum ratings and operating conditions 1 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings (AMR) Symbol Parameter Value Unit V Supply voltage(1) 6 CC V Differential input voltage(2) ±2.5 V id V Input voltage(3) V -0.3 to V +0.3 in DD CC T Storage temperature -65 to +150 °C stg Thermal resistance junction to ambient(4)(5) Rthja SOT23-5 250 SO-8 125 °C/W Thermal resistance junction to case Rthjc SOT23-5 81 SO-8 40 T Maximum junction temperature 150 °C j HBM: human body model(6) 5 kV ESD MM: machine model(7) 300 V CDM: charged device model(8) 2 kV Latchup immunity class A 1. Value with respect to V pin. DD 2. Differential voltages are the non-inverting input terminal with respect to the inverting input terminal. 3. V -V and V must not exceed 6 V. CC in in 4. Short-circuits can cause excessive heating and destructive dissipation. 5. R are typical values. thja/c 6. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 7. Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations while the other pins are floating. 8. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins. Table 2. Operating conditions Symbol Parameter Value Unit V Supply voltage(1) 2.7 to 5.5 CC V Common mode input voltage range V to V V icm DD CC V Differential input voltage(2) ±2.5 id Operating free air temperature range Toper TS507C 0 to +85 °C TS507I -40 to +125 1. Value with respect to V pin. DD 2. Differential voltages are the non-inverting input terminal with respect to the inverting input terminal. DocID10958 Rev 6 3/20

Electrical characteristics TS507 2 Electrical characteristics Table 3 . Electrical characteristics at V = +5 V, V = 0 V, V = V /2, T = 25 °C, CC DD icm CC amb R connected to V /2 (unless otherwise specified)(1) L CC Symbol Parameter Conditions Min. Typ. Max. Unit DC performance V = 0 to 3.8 V, T=25 °C 25 100 icm TS507C full temperature range 250 TS507I full temperature range 400 V Input offset voltage(2) µV io V = 0 V to 5 V, T=25 °C 450 icm TS507C full temperature range 550 TS507I full temperature range 750 ΔV /Δt V drift vs. temperature T < T < T 1 µV/°C io io min op max T = 25 °C 8 70 I Input bias current TS507C full temperature range 75 ib TS507I full temperature range 110 nA T = 25 °C 2 25 I Input offset current TS507C full temperature range 35 io TS507I full temperature range 50 V from 0 V to 3.8 V, T=25 °C 94 115 icm Common mode rejection ratio TS507C full temperature range 94 CMRR 20 log (ΔV /ΔV ) TS507I full temperature range 91 icm io V from 0 V to 5 V 96 icm V from 2.7 V to 5.5 V, CC dB Power supply rejection ratio Vicm=Vcc/2, T=25 °C 91 105 PSRR 20 log (ΔVCC/ΔVio) TS507C full temperature range 90 TS507I full temperature range 89 R = 10 kΩ, V = 0.5 V to 4.5 V 99 131 A Large signal voltage gain L out vd Full temperature range 98 R = 600Ω, T=25°C 67 95 L TS507C full temperature range 110 V -V High level output voltage drop TS507I full temperature range 120 CC OH R = 10 kΩ, T=25 °C 4 15 L Full temperature range 15 mV R = 600 Ω, T=25 °C 64 90 L TS507C full temperature range 110 V Low level output voltage TS507I full temperature range 125 OL R = 10 kΩ, T=25 °C 4 15 L Full temperature range 15 4/20 DocID10958 Rev 6

TS507 Electrical characteristics Table 3. Electrical characteristics at V = +5 V, V = 0 V, V = V /2, T = 25 °C, CC DD icm CC amb R connected to V /2 (unless otherwise specified)(1) (continued) L CC Symbol Parameter Conditions Min. Typ. Max. Unit V = V V =-1 V, T=25 °C 74 104 out CC, id I TS507C full temperature range 60 sink TS507I full temperature range 53 I out V = V , V =1 V, T=25 °C 90 128 out DD id I TS507C full temperature range 77 mA source TS507I full temperature range 70 No load, V =V /2, out CC I Supply current (per operator)(2) V =0 to 5 V, T=25 °C 0.85 1.15 CC icm Full temperature range 1.25 Dynamic performance R = 2 kΩ, C = 100 pF, GBP Gain bandwidth product L L 1.9 MHz f = 100 kHz φ Phase margin 45 Degrees m R = 2 kΩ, C =100 pF L L G Gain margin 10 dB m R = 2 kΩ, C =100 pF, SR Slew rate VL = 1.25 V Lto 3.75 V, 0.6 V/µs out 10% to 90% e Equivalent input noise voltage f = 1 kHz 12 nV/√ Hz N i Equivalent input noise current f = 10 kHz 1.2 pA/√ Hz N f=1 kHz, G=1, R =2 kΩ, THD+e THD + noise L 0.0003 % N V =2 V, V =3.5 V icm out pp 1. All parameter limits at temperatures different from 25 ° C are guaranteed by correlation. 2. Measurements made at 4 V values: V =0 V, V =3.8 V, V =4.2 V, V =5 V. icm icm icm icm icm DocID10958 Rev 6 5/20

Electrical characteristics TS507 Table 4 . Electrical characteristics at V = +3.3 V, V = 0 V, V = V /2, T = 25 °C, CC DD icm CC amb R connected to V /2 (unless otherwise specified)(1) L CC Symbol Parameter Conditions Min. Typ. Max. Unit DC performance V = 0 to 2.1 V, T=25 °C 25 100 icm TS507C full temperature range 250 TS507I full temperature range 400 V Input offset voltage(2) µV io V = 0 V to 3.3 V, T=25 °C 450 icm TS507C full temperature range 550 TS507I full temperature range 750 ΔV V drift vs. temperature T < T < T 1 µV/°C io io min op max T = 25 °C 6 70 I Input bias current TS507C full temperature range 75 ib TS507I full temperature range 145 nA T = 25 °C 2 25 I Input offset current TS507C full temperature range 40 io TS507I full temperature range 45 Common mode rejection ratio CMRR V from 0 V to 2.1 V 115 20 log (ΔV /ΔV ) icm icm io dB A Large signal voltage gain R = 10 kΩ, V = 0.5 V to 2.8 V 127 vd L out R = 600 Ω, T=25 °C 59 85 L TS507C full temperature range 100 V -V High level output voltage drop TS507I full temperature range 110 CC OH R = 10 kΩ, T=25 °C 4 15 L Full temperature range 15 mV R = 600 Ω, T=25 °C 57 80 L TS507C full temperature range 100 V Low level output voltage TS507I full temperature range 115 OL R = 10 kΩ, T=25 °C 4 15 L Full temperature range 15 V = V V =-1 V, T=25 °C 33 48 out CC, id I TS507C full temperature range 26 sink TS507I full temperature range 22 I out V = V , V =1 V, T=25 °C 37 56 out DD id I TS507C full temperature range 32 mA source TS507I full temperature range 29 No load, V =V /2, out CC I Supply current (per operator)(2) V =0 to 3.3 V, T=25 °C 0.81 1.1 CC icm Full temperature range 1.2 6/20 DocID10958 Rev 6

TS507 Electrical characteristics Table 4. Electrical characteristics at V = +3.3 V, V = 0 V, V = V /2, T = 25 °C, CC DD icm CC amb R connected to V /2 (unless otherwise specified)(1) (continued) L CC Symbol Parameter Conditions Min. Typ. Max. Unit Dynamic performance R = 2 kΩ, C = 100 pF, GBP Gain bandwidth product L L 1.9 MHz f = 100 kHz φ Phase margin 45 Degrees m R = 2 kΩ, C =100 pF L L G Gain margin 10 dB m R = 2 kΩ, C =100 pF, L L SR Slew rate Vout= 0.5 V to 2.8 V, 0.6 V/µs 10 % to 90 % e Equivalent input noise voltage f = 1 kHz 12 nV/√ Hz N f=1 KHz, G=1, R =2 kΩ, THD+e THD + noise L 0.0004 % N V =1.15 V, V =1.8 V icm out pp 1. All parameter limits at temperatures different from 25 ° C are guaranteed by correlation. 2. Measurements done at 4 V values: V =0 V, V =2.1 V, V =2.5 V, V =3.3 V. icm icm icm icm icm DocID10958 Rev 6 7/20

Electrical characteristics TS507 Table 5 . Electrical characteristics at V = +2.7 V V = 0 V, V = V /2, T = 25 °C, CC DD icm CC amb R connected to V /2 (unless otherwise specified)(1) L CC Symbol Parameter Conditions Min. Typ. Max. Unit DC performance V = 0 to 1.9 V, T=25 °C 25 100 icm TS507C full temperature range 250 TS507I full temperature range 400 V Input offset voltage(2) µV io V = 0 V to 2.7 V, T=25 °C 450 icm TS507C full temperature range 550 TS507I full temperature range 750 ΔV V drift vs. temperature T < T < T 1 µV/°C io io min op max T = 25 °C 8 70 I Input bias current TS507C full temperature range 75 ib TS507I full temperature range 160 nA T = 25 °C 2 25 I Input offset current TS507C full temperature range 45 io TS507I full temperature range 45 Common mode rejection ratio CMRR V from 0 V to 1.5 V 115 20 log (ΔV /ΔV ) icm icm io dB A Large signal voltage gain R = 10 kΩ, V = 0.5 V to 2.2 V 126 vd L out R = 600 Ω, T=25 °C 57 85 L TS507C full temperature range 100 V -V High level output voltage drop TS507I full temperature range 105 CC OH R = 10 kΩ, T=25 °C 4 15 L Full temperature range 15 mV R = 600 Ω, T=25 °C 57 80 L TS507C full temperature range 100 V Low level output voltage TS507I full temperature range 115 OL R = 10 kΩ, T=25 °C 4 15 L Full temperature range 15 V = V V =-1 V, T=25 °C 20 30 out CC, id I TS507C full temperature range 15 sink TS507I full temperature range 13 I out V = V , V =1 V, T=25 °C 22 35 out DD id I TS507C full temperature range 19 mA source TS507I full temperature range 17 No load, V =V /2, out CC I Supply current (per operator)(2) V =0 to 2.7 V, T=25 °C 0.79 1.1 CC icm Full temperature range 1.2 8/20 DocID10958 Rev 6

TS507 Electrical characteristics Table 5. Electrical characteristics at V = +2.7 V V = 0 V, V = V /2, T = 25 °C, CC DD icm CC amb R connected to V /2 (unless otherwise specified)(1) (continued) L CC Symbol Parameter Conditions Min. Typ. Max. Unit Dynamic performance R = 2 kΩ, C = 100 pF, GBP Gain bandwidth product L L 1.9 MHz f = 100 kHz φ Phase margin 45 Degrees m R = 2 kΩ, C =100 pF L L G Gain margin 11 dB m R = 2 kΩ, C =100 pF, L L SR Slew rate V = 0.5 V to 2.2 V, 0.6 V/µs out 10 % to 90 % e Equivalent input noise voltage f = 1 kHz 12 nV/√ Hz N f=1 KHz, G=1, R =2 kΩ, THD+e THD + noise L 0.0005 % N V =0.85 V, V =1.2 V icm out pp 1. All parameter limits at temperatures different from 25 ° C are guaranteed by correlation. 2. Measurements done at 4 V values: V =0 V, V =1.5 V, V =1.9 V, V =2.7 V. icm icm icm icm icm DocID10958 Rev 6 9/20

Electrical characteristics TS507 Figure 1. Input offset voltage distribution for Figure 2. Input offset voltage distribution vs. V ≤ V -1.2 V at T=25 °C temperature for V ≤ V -1.2 V icm CC icm CC 30 400 350 25 Vio distribution at T=25°C for 0V<=Vicm<=Vcc-1.2V 235000 0V<=Vicm<=Vcc-1.2V 200 150 20 100 % pulation 15 Vio (µV) -1-0550000 Po 10 -150 -200 -250 5 -300 -350 -400 0 -50-40-30-20-10 0 10 20 30 40 50 60 70 80 90100110120130 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 Input offset voltage (µV) Temperature (°C) Figure 3. Input offset voltage distribution vs. Figure 4. Input offset voltage distribution for temperature for V ≥ V -0.8 V V ≤ V -1.2 V at T=25 °C after HTB icm CC icm CC 700 45 600 Vio distribution at T=25°C for 0V<=Vicm<=Vcc-1.2V 500 Vcc-0.8V<=Vicm<=Vcc 40 after HTB (1000 hours at 125°C) 400 35 300 200 30 100 % µV) 0 on 25 Vio ( --210000 pulati 20 -300 Po 15 -400 -500 10 -600 5 -700 -50-40-30-20-10 0 10 20 30 40 50 60 70 80 90100110120130 0 -100 -80 -60 -40 -20 0 20 40 60 80 100 Temperature (°C) Input offset voltage (µV) Figure 5. Input offset voltage distribution for Figure 6. Input offset voltage vs. input common V ≤ V -1.2 V at T=25 °C after THB mode voltage at T=25 °C icm CC 4400 35 Vcc=3.3V Vcc=2.7V Vio distribution at T=25°C for 0V<=Vicm<=Vcc-1.2V 2200 30 after THB (1000 hours at 85°C, humidity 85%) V) 25 μe ( 00 % ag opulation 1250 Offset Volt ----44220000 Vcc=5.5V Vcc=5V P ut 10 p --6600 n I 5 --8800 0 --110000 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 --22..55 --22..00 --11..55 --11..00 --00..55 00..00 Input offset voltage (µV) Vicm-Vcc (V) 10/20 DocID10958 Rev 6

TS507 Electrical characteristics Figure 7. Supply current vs. input common Figure 8. Supply current vs. supply voltage mode voltage in closed loop configuration at V =V /2 icm CC at V =5 V CC 11..00 11..00 T=125°C 0.8 0.8 mA)0.7 T=125°C mA)0.7 nt ( T=-40°C T=25°C nt ( T=25°C urre00..55 urre00..55 T=-40°C C C y y pl0.3 pl0.3 up Vcc=5V up S Closed loop S 0.2 0.2 Vicm=Vcc/2 00..00 00..00 00 11 22 33 44 55 00 11 22 33 44 55 Input common mode voltage (V) Supply voltage (V) Figure 9. Supply current vs. input common Figure 10. Supply current vs. input common mode voltage in follower configuration mode voltage in follower configuration at V =2.7 V at V =5 V CC CC 11..00 11..00 T=125°C 0.8 0.8 T=25°C A)0.7 A)0.7 nt (m nt (m T=125°C T=25°C urre00..55 T=-40°C urre00..55 T=-40°C C C y y pl0.3 pl0.3 p Follower configuration p Su Vcc=2.7V Su Follower configuration Vcc=5V 0.2 0.2 00..00 00..00 00..00 00..55 11..00 11..55 22..00 22..55 00 11 22 33 44 55 Input Common Mode Voltage (V) Input Common Mode Voltage (V) Figure 11. Output current vs. supply voltage Figure 12. Output current vs. output voltage at V =V /2 at V =2.7 V icm CC CC 150 4400 125 SVoidu =rc 1eV T=-40°C 3305 T=-40°C 110000 T=25°C 25 Source 75 T=125°C 2200 Vid=1V mA) 50 mA) 15 T=25°C T=125°C nt ( 25 nt ( 105 e Vicm=Vcc/2 e urr 00 urr 00 Vcc=2.7V ut C -25 ut C -1-05 utp -50 utp -15 T=125°C T=25°C O -75 O --2200 --110000 T=125°C -25 Sink Sink -30 Vid=-1V -125 Vid = -1V T=25°C T=-40°C -35 T=-40°C -150 --4400 33..00 33..55 44..00 44..55 55..00 55..55 00..00 00..55 11..00 11..55 22..00 22..55 Supply voltage (V) Output Voltage (V) DocID10958 Rev 6 11/20

Electrical characteristics TS507 Figure 13. Output current vs. output voltage Figure 14. Positive and negative slew rate vs. at V =5 V supply voltage CC 150 11..00 111002005 T=25°C SVoidu=r1cVe e (V/µs) 00..88 Positive slew rate T=125°C 75 T=-40°C Rat 00..66 nt (mA) 2550 T=125°C ve Slew 0000....2244 T=-40°C T=25°C ut Curre -2500 Vcc=5V T=125°C d Negati --0000....2200 VSiRn :: cfraolmcu l0a.t5eVd tforo Vmc c1-00%.5 Vto 90% T=-40°C Outp --7550 ve an --00..44 T=25°C --110000 Sink ositi --00..66 -125 Vid=-1V P --00..88 Negative slew rate T=125°C T=-40°C T=25°C -150 --11..00 00..00 11..00 22..00 33..00 44..00 55..00 2.0 2.5 33..00 3.5 4.0 4.5 55..00 5.5 6.0 Output Voltage (V) Supply Voltage (V) Figure 15. Voltage gain and phase vs. frequency Figure 16. Voltage gain and phase vs. frequency at V =5 V and V =2.5 V at T=25 °C at V =5 V and V =2.5 V at T=-40 °C CC icm CC icm 50 180 50 180 4400 Phase 150 4400 150 120 120 30 30 90 90 2200 Cl=100pF 2200 60 60 n (dB) 1000 Gain Cl=230pF 030 se (°) n (dB) 1000 Phase 030 se (°) Gai -10 -30 Pha Gai -10 Gain -30 Pha --2200 Vcc=5V, Vicm=2.5V, G= -100 -60 --2200 -60 Rl=2kOhms, Vrl=Vcc/2 -90 -90 -30 Tamb=25°C -30 Vcc=5V, Vicm=2.5V, G= -100 -120 Rl=2kOhms, Cl=100pF, Vrl=Vcc/2 -120 --4400 -150 --4400 Tamb=-40°C -150 -50 -180 -50 -180 104 105 106 107 104 105 106 107 Frequency (Hz) Frequency (Hz) Figure 17. Voltage gain and phase vs. frequency Figure 18. Closed loop gain in voltage follower at V =5 V and V =2.5 V at T=125 °C configuration for different capacitive load CC icm at T=25 °C 50 180 2200 4400 115500 TS507 : V = 5 V 30 112200 10 Vciccm = 2,5 V 9900 T = 25 °C 2200 6600 00 RL = 10 kΩ Gain (dB) -110000 Gain Phase --033330000 Phase (°) Gain (dB) -10 GGaainin w witihtho uCt C=3L00 pF --2200 --6600 --2200 L Vcc=5V, Vicm=2.5V, G= -100 --9900 -30 Rl=2kOhms, Cl=100pF, Vrl=Vcc/2 --112200 -30 Gain with CL=550 pF --4400 Tamb=125°C --115500 -50 -180 --4400 104 105 106 107 10k 100k 1M 10M Frequency (Hz) Frequency (Hz) 12/20 DocID10958 Rev 6

TS507 Electrical characteristics Figure 19. Gain margin according to the output Figure 20. Phase margin according to the load, at V =5 V and T=25 °C output load, at V =5 V and T=25 °C CC CC 1E-6 1E-6 V = 5 V V = 5 V cc cc 1E-7 VTaicmmb == 22,55 °VC 1E-7 0 ° UNSTABLE VTaicmmb == 22,55 °VC d Capacitor (F) 11EE--98 UNSTABLE0 dB d Capacitor (F) 11EE--98 10 ° Loa 1E-10 10 dB Loa 1E-10 20 ° 30 ° 1E-11 30 dB 20 dB 1E-11 40 ° STABLE STABLE 50 ° 1E-12 1E-12 1 10 100 1k 10k 100k 1M 10M 1 10 100 1k 10k 100k 1M 10M Load Resistor (Ω) Load Resistor (Ω) Figure 21. Gain margin vs. output current, Figure 22. Phase margin vs. output current, at V =5 V and T=25 °C at V =5 V and T=25 °C CC CC 2200..00 70 17.5 Recommended area 6600 Recommended area 1155..00 100 pF 50 n Margin (dB) 1117002....5005 550 pF 300 pF se Margin (°) 344000 550 pF 100 pF 300 pF Gai 55..00 Pha 2200 V = 5 V V = 5 V 2.5 Vcc = 2,5 V 10 Vcc = 2,5 V 00..00 TRaicm m=b =2 2k5Ω °C 00 TRaicm m=b =2 2k5Ω °C L L -2.5 -10 --44 -3 --22 -1 00 1 22 3 44 --44 -3 --22 -1 00 1 22 3 44 Output Current (mA) Output Current (mA) Figure 23. Phase and gain margins vs Figure 24. Distortion + noise vs. output voltage capacitive load at = 25 °C 30 75 0.1000 V = 5 V cc 2200 VTicm == 22,55 °VC 50 Vcc=5V Ram =b 2 kΩ 10 L 25 0.0100 Gain (dB) -1000 Gain Margin -025 Phase (°) HD + N (%) f=1kHz VccV=c3c.=3V2.7V T 0.0010 Rl=2kOhms --2200 -50 Gain=1 Phase Margin BW=22kHz -30 -75 Vicm=(Vcc-1V)/2 --440010p 100p 1n 10n-100 0.0001 0.01 0.1 1 Load Capacitor (F) Output Voltage (Vpp) DocID10958 Rev 6 13/20

Electrical characteristics TS507 Figure 25. Distortion + noise vs. frequency Figure 26. Noise vs. frequency 0.01 1000 Vout=Vcc-1.5Vpp VHz) Rl=2kOhms V/ n Gain=1 y ( %) BViWcm==80(VkcHcz-1V)/2 Vcc=2.7V densit 100 + N ( 1E-3 oise THD Vcc=3.3V ent n al 10 Vcc=5V uiv q Vcc=5V, Vicm=2.5V, Tamb=25°C e ut p n I 1E-4 1 10 100 1000 10000 1 10 100 1000 10000 Frequency (Hz) Frequency (Hz) 14/20 DocID10958 Rev 6

TS507 Application note 3 Application note The application note AN2653, based on the TS507, describes three compensation techniques for solving stability issues when driving large capacitive loads. Two of these techniques are briefly explained below. For more details, refer to the AN2653 on: www.st.com. 3.1 Out-of-the-loop compensation technique The first technique, named out-of-the-loop compensation, uses an isolation resistor, R , OL added in series between the output of the amplifier and its load (see Figure 27). The resistor isolates the op-amp feedback network from the capacitive load. This compensation method is effective, but the drawback is a limitation on the accuracy of V depending on the out resistive load value. Figure 27. Out-of-the-loop compensation schematics To help implement the compensation, the abacus given in Figure 28 and Figure 29 provides the R value to be chosen for a given C and phase/gain margins. These abacus are OL L plotted for voltage follower configuration with a load resistor of 10 kΩ at 25 °C. Figure 28. Gain margin abacus: serial resistor Figure 29. Phase margin abacus: serial resistor to be added in a voltage follower to be added in a voltage follower configuration at 25 °C configuration at 25 °C 100 100 STABLE STABLE 30 ° Compensation Resistor ROL 01.011 16 dB 12 dB8 dB4 dB0 dB UNSTABLE Vcc = 5 V Compensation Resistor ROL 01.011 UNSTABLE Vcc = 5 21V000 °°° V = 2,5 V V = 2,5 V icm icm T = 25 °C T = 25 °C R = 10 kΩ R = 10 kΩ L L 0.01 0.01 10p 100p 1n 10n 100n 1µ 10µ 10p 100p 1n 10n 100n 1µ 10µ Load Capacitor (F) Load Capacitor (F) DocID10958 Rev 6 15/20

Application note TS507 3.2 In-the-loop-compensation technique The second technique is called in-the-loop-compensation technique, because the additional components (a resistor and a capacitor) used to improve the stability are inserted in the feedback loop (see Figure 30). Figure 30. In-the-loop compensation schematics This compensation method allows (by a good choice of compensation components) the original pole caused by the capacitive load to be compensated. Stability is thus improved. The main drawback of this circuit is the reduction of the output swing, because the isolation resistor is in the signal path. Table 6 shows the best compensation components for different ranges of load capacitors (with R = 10 kΩ) in voltage follower configuration. L Table 6. Best compensation components for different load capacitor ranges in voltage follower configuration for TS507 (with R = 10 kΩ) L Load capacitor Minimum gain Minimum phase R (kΩ) C (pF) range IL IL margin (dB)(1) margin (degree)(1) 10 pF to 100 pF 1 250 17 55 100 pF to 1 nF 1 250 16 42 1 nF to 10 nF 1 630 11 27 1. Parameter guaranteed by design at 25 °C. 16/20 DocID10958 Rev 6

TS507 Package information 4 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 4.1 SOT23-5 package information Figure 31. SOT23-5 package mechanical drawing Table 7. SOT23-5 package mechanical data Dimensions Ref. Millimeters Mils Min. Typ. Max. Min. Typ. Max. A 0.90 1.45 35.4 57.1 A1 0.00 0.15 0.00 5.9 A2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 C 0.09 0.20 3.5 7.8 D 2.80 3.00 110.2 118.1 E 2.60 3.00 102.3 118.1 E1 1.50 1.75 59.0 68.8 e 0.95 37.4 e1 1.9 74.8 L 0.35 0.55 13.7 21.6 DocID10958 Rev 6 17/20

Package information TS507 4.2 SO-8 package Figure 32. SO-8 package mechanical drawing Table 8. SO-8 package mechanical data Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A 1.75 0.069 A1 0.10 0.25 0.004 0.010 A2 1.25 0.049 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.010 D 4.80 4.90 5.00 0.189 0.193 0.197 E 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e 1.27 0.050 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k 1° 8° 1° 8° ccc 0.10 0.004 18/20 DocID10958 Rev 6

TS507 Ordering information 5 Ordering information Table 9. Order codes Order code Temperature range Package Packing Marking TS507ID Tube or -40°C to 125 °C SO-8 TS507I TS507IDT tape and reel TS507ILT SOT23-5(1) K131 -40°C to 125 °C SOT23-5(1) Tape and reel TS507IYLT(2) K137 (automotive grade) TS507CD Tube or SO-8 TS507C TS507CDT 0°C to 85 °C tape and reel TS507CLT SOT23-5(1) Tape and reel K136 1. All information related to the SOT23-5 package is subject to change without notice. 2. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent are qualified. 6 Revision history Figure 33. Document revision history Date Revision Changes 01-Oct-2004 1 Preliminary data release for product in development. 02-May-2006 2 Update preliminary data release for product in development. 15-Dec-2006 3 First public release. 03-May-2007 4 Automotive grade products added. Electrical characteristics curves for Bode and AC stability added and 08-Apr-2008 5 updated. Application note section added. Features: added automotive qualification 21-Mar-2013 6 Updated Table 9: Order codes DocID10958 Rev 6 19/20

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