Linear Low Dropout (LDO) Regulator Solutions

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1 VOL 2 Linear Low (LDO Regulator Solutions High Performance Analog ICs

2 Introduction We offer a broad line of high performance low dropout (LDO linear regulators with fast transient response, excellent line and load regulation, and very wide input voltage range from.9v to 1V. currents range from 2mA to 1A, with positive, negative and multiple output versions available. Many devices offer output voltage operation <.8V and some feature operation as low as V, even with a single supply. Most are stable with ceramic output capacitors. Our PNP-based linear regulators offer reverse-input, reverse-output, and reverse-current protection. Our LDO+ devices include monitoring of voltage, current, temperature and diagnostic flags that indicate fault conditions. LDO regulators can be applied in virtually any application. For the most current product information, please visit Contents Single LDO Regulators Positive Negative High PNP...1 PNP Micropower PNP...4 NPN (2nd Generation NPN (1st Generation...8 Very Low (VLDO...9 NMOS for Digital ICs...1 Radiation Hardened (RH...13 NPN...11 Radiation Hardened (RH...13 Dual LDO Regulators Positive...5 Positive/Negative...11 LDO Controllers Positive...12 Sources Sources...7

1 High PNP Positive Linear Regulators PNP family features: Rugged and Hard to Kill Up to 8 Continuous Operation Low Noise Extensive Reverse Protection for Harsh Environments in Automotive, Avionics

6M POWER GOOD IN OUT LT311 75k SHDN ADJ PWRGD C T 249k 1pF 5V 5mA 1µF DROPOUT VOLTAGE (mv 3 25 2 15 1 5 1 2 3 4 5 OUTPUT CURRENT (ma LT313: 25mA, 4V to 8V Low Micropower Linear Regulator with PWRGD 4

3 1 High PNP Positive Linear Regulators PNP family features: Rugged and Hard to Kill Up to 8 Continuous Operation Low Noise Extensive Reverse Protection for Harsh Environments in Automotive, Avionics and Industrial Applications LT311 LT313 LT 311: 5mA, 3V to 8V Low Micropower Linear Regulator with PWRGD 35 3V TO 8V 1µF 1.6M POWER GOOD IN OUT LT311 75k SHDN ADJ PWRGD C T 249k 1pF 5V 5mA 1µF DROPOUT VOLTAGE (mv OUTPUT CURRENT (ma LT313: 25mA, 4V to 8V Low Micropower Linear Regulator with PWRGD 4 5.4V TO 8V 1µF 1.6M IN OUT LT313 SHDN PWRGD ADJ C T 1pF 75k 249k 5V 25mA 3.3µF DROPOUT VOLTAGE (mv OUTPUT CURRENT (ma (A Min Max (Supply (μa Noise (µv RMS or % of High PNP Positive Linear Regulators LT Adj (1.22 to E I TSOT-5, 3x3 DFN-8 LT314HV Adj (1.22 to E I TSOT-5, 3x3 DFN-8 LT314B Adj (1.22 to E I TSOT-5, 3x3 DFN-8 LT314BHV Adj (1.22 to E I TSOT-5, 3x3 DFN-8 LT Adj (1.275 to 6, 5 1 E H MP MSOP-8E LT311* Adj (1.24 to 6 1 E I H MSOP-12E, 3x3 DFN-1 LT Adj (1.24 to 6 1 E H TSSOP-16E, 3x4 DFN-12 LT312B Adj (1.24 to 6 1 E TSSOP-16E, 3x4 DFN-12 LT313* Adj (1.24 to 6 1 E H MP TSSOP-16E, 3x4 DFN-12 LT313B* Adj (1.24 to 6 1 E TSSOP-16E, 3x4 DFN-12 * Power Good LDO+

2 PNP Positive Linear Regulators PNP family features: Low Noise Wide Range Low Fast Transient Response and Extensive Reverse Protection Precision Limits LT386 LT355 LT386: 1.

24A FULL-SCALE V TEMP 1mV/ C 25 C = 25mV IN OUT LT386 R 1µF SET 82.5k 1µF 9.9k + 1.

4 2 PNP Positive Linear Regulators PNP family features: Low Noise Wide Range Low Fast Transient Response and Extensive Reverse Protection Precision Limits LT386 LT355 LT386: 1.5A Rail-to-Rail, Low PNP Linear Regulator with Monitoring and Cable Drop Compensation Transient Response with Cable Drop Compensation (CDC 6V TO 15V TO ADC.8V AT 2.24A FULL-SCALE V TEMP 1mV/ C 25 C = 25mV IN OUT LT386 R 1µF SET 82.5k 1µF 9.9k + 1.1k SHDN SET TEMP R CDC 1k TRACK CDC R CDC I MON R PWRGD I LIM PWRGD V PWRGD R MON 357Ω *SEE APPLICATIONS INFORMATION FOR INDUCTANCE EFFECTS ASSOCIATED WITH R WIRE CABLE R LINE1 R LINE2 LOAD V LOAD 5V AT 2.1A OUTPUT VOLTAGE LOAD CURRENT (A WITH CDC V LOAD WITH CDC V LOAD WITHOUT CDC I LOAD =.5A TO 1.5A = 6V R MON = 357 R WIRE =.24 R CDC = 46.4k TIME (µs LT355: 5mA Linear Regulator with Precision Limit and Diagnostics External Limit R IMAX = 64Ω LT355 CURRENT LIMIT FAULT THRESHOLD (ma (NOMINAL = 5V = 7V = 5.6V TEMPERATURE ( C

5 3 (A Min PNP Positive Linear Regulators Max (Supply (μa LT Adj (1.22 to 19.5, 1.2, 1.5, 1.8, 2, 2.5, 2.8, 3, 3.3, 5 LT Adj (.6 to 44.5, 3.3, 5 LT Adj (.6 to 44.5, 1.2, 1.5, 1.8, 2.5, 3.3, 5, 15 Noise (µv RMS or % of 2 E I MP TSOT-5 3 E I MP 2x3 DFN-12, MSOP-12E 3 E I H MP 2x2 DFN-8, TSOT-8 LT361 # Adj (.6 to 19 3 E I H MP 2x3 DFN-8, MSOP-8E LT Adj C I SO-16, DIP-14 LT112/A Adj C I SO-8, DIP-8 LT1121/A/HV / Adj (3.75 to 29/35, 3.3, 5 LT Adj (1.22 to 19.5, 2.5, 3, 3.3, 5 C I SOT-223, SO-8, TO-92, DIP-8 2 E MSOP-8 LT Adj (.6 to 4 3 E I H MP 2x3 DFN-8, MSOP-8E LT363 # Adj (.6 to 19 3 E I H MP 2x3 DFN-8, MSOP-8E LT Adj (3.75 to 19, 3, 3.3, 5 LT Adj (1.5 to 19, 3, 3.3, 5 LT Adj (1.22 to 19.5, 1.5, 1.8, 2.5, 3, 3.3, 5 LT Adj (1.22 to 19.5, 1.5, 1.8, 2.5, 3, 3.3, 5 C I SOT-223, SO-8, MSOP-8 C SO-8, SO-16, SSOP-16 2 E MSOP-8 2 C I MP 3x4 DFN-12, SO-8, LT Adj (.6 to E I H MP 3x4 DFN-16, MSOP-16E LT Adj (.6 to E I H MP 3x3 DFN-1, MSOP-12E LT Adj (3.75 to 29, 3.3, 5 LT Adj (1.2 to 19.5, 1.5, 1.8, 2.5, 3.3 LT1963/A* mA Adj (1.21 to 19.5, 1.5, 1.8, 2.5, 3.3 E I MP DD-Pak, SOT-223, SO-8, TO-22, TSSOP-2 4 E I H 3x3 DFN-8, MSOP-8E, DD-Pak, TO-22 4 E I MP TSSOP-16E, DD-Pak, TO-22, SOT-223, SO-8 LT µA mA Adj ( to E I H MP 4x4 DFN-12, TSSOP-16E, TO-22, DD-Pak LT mV/5µA mA Adj (.4 to 32 4 E I MP TSSOP-16E, 4x5 DFN-16, DD-Pak, TO-22 LT Adj (3.3 to 14, 3.3 C DD-Pak, TO-22 LT Adj (3.75 to 14, 3.3, 5 LT1764/A* mA Adj (1.21 to 19.5, 1.5, 1.8, 2.5, 3.3 * A Versions are stable with ceramic capacitors Single-Resistor Set Power Good # Active Discharge LDO+ C I DD-Pak, TO-22 4 E MP DD-Pak, TO-22, TSSOP-16E

4 Micropower PNP Positive Linear Regulators Micropower PNP family features: Sub-5µA Quiescent Good Noise Performance Keep Alive, Real-Time Clock and Remote Monitoring Applications LT38 LT37: 3µA I Q,

6 4 Micropower PNP Positive Linear Regulators Micropower PNP family features: Sub-5µA Quiescent Good Noise Performance Keep Alive, Real-Time Clock and Remote Monitoring Applications LT38 LT37: 3µA I Q, 2mA, 45V Low Fault Tolerant Linear Regulator /Quiescent 3.8V TO 45V 1µF IN OUT LT SHDN SENSE 2.2µF 3.3V 2mA DROPOUT VOLTAGE (mv I LOAD = 2mA I Q DROPOUT VOLTAGE QUIESCENT CURRENT (µa TEMPERATURE ( C LT39: 3µA I Q, 2mA Low Linear Regulator /Quiescent 5 I LOAD = 2mA V TO 2V 1µF IN OUT LT SHDN 1µF 3.3V 2mA DROPOUT VOLTAGE (mv I Q DROPOUT 3.5 VOLTAGE QUIESCENT CURRENT (µa TEMPERATURE ( C (A Min Max (Supply (μa Micropower PNP Positive Linear Regulators LT Adj (.6 to 19.5, 1.2, 1.5, 1.8, 2.5, 3.3, 5 LT37* Adj (.6 to 44.5, 1.2, 1.5, 1.8, 2.5, 3.3, 5 LT Adj (.6 to 44.5, 1.2, 1.5, 1.8, 2.5, 3.3, 5 Noise (µv RMS or % of 15 E I SC7-8, 2x2 DFN-6 92 E I TSOT-8 92 E I MP TSOT-8, 2x2 DFN-6 *FMEA Fault Tolerant version

5 Dual PNP Linear Regulators Dual linear regulator family features: Highly Compact Solution All the Performance Features of our Single PNP Regulators Ideal for Core/Logic Combinations LT33 LT332

4V TO 2V <.25V = OFF >2V = ON 5.4V TO 2V 1µF LT332-5.1µF 1µF 1µF INP SHDNP SHDNN INN OUTP BYPP BYPN OUTN.

7 5 Dual PNP Linear Regulators Dual linear regulator family features: Highly Compact Solution All the Performance Features of our Single PNP Regulators Ideal for Core/Logic Combinations LT33 LT332 LT33: Dual 75mA/25mA Low, Low Noise Micropower Linear Regulator vs Load 2.5V IN1 OUT1 3.3µF IN2 LT33 1nF 1µF 113k SHDN1 SHDN2 BYP1 ADJ1 1M 1M 237k PWRGD1 PWRGD2 OUT2 BYP2 ADJ2 1nF 54.9k 237k 3.3µF 1 1.8V 75mA 2 1.5V 25mA DROPOUT VOLTAGE (mv 5 T J = 25 C OUT OUT OUTPUT CURRENT (ma LT332: Dual 15mA Positive/Negative Low Noise Regulator 1Hz to 1kHz Noise 5.4V TO 2V <.25V = OFF >2V = ON 5.4V TO 2V 1µF LT µF 1µF 1µF INP SHDNP SHDNN INN OUTP BYPP BYPN OUTN.1µF 5 AT 15mA 2µV RMS NOISE 1µF 5 AT 15mA 3µV RMS NOISE OUTP 1µV/DIV OUTN 1µV/DIV 1mS/DIV 2µV RMS 3µV RMS (A Min Max Dual Positive Linear Regulators (Supply (μa Noise (µv RMS or % of LT323.1/ Adj (1.22 to 2 2 E I MSOP-1E, 3x3 DFN-1 LT327.1/ Adj (1.22 to 2 2 E I MSOP-1E, 3x3 DFN-1 LT324.1/ Adj (1.22 to 2 2 E I TSSOP-16E, 3x4 DFN-12 LT328.1/ Adj (1.22 to 2 2 E I TSSOP-16E, 3x5 DFN-16 LT329.5/ Adj (1.215 to E I H MP MSOP-16E, 3x4 DFN-16 LT33*.75/ Adj (1.22 to E I H MP 4x5 QFN-28, TSSOP-2E Dual Positive and Negative Linear Regulators LT332 ±.15 ±1.8 ±2 ±1.22.3/ Adj, ±3.3, ±5, ±12, ±15 2 / 3 E I MP 3x4 DFN-14 * Power Good

6 Single Resistor Set, -Based NPN/PNP Positive Linear Regulators Second generation NPN family features: Operation Down to V Direct Paralleling to

Independent of Load Regulation Independent of LT381 LT383 LT381: 1.

8 6 Single Resistor Set, -Based NPN/PNP Positive Linear Regulators Second generation NPN family features: Operation Down to V Direct Paralleling to Spread PCB Heat Low Noise and Simplicity with a Single Resistor Set Capability Always Operates in Unity-Gain Bandwidth Independent of Noise Independent of Load Regulation Independent of LT381 LT383 LT381: 1.5A Single Resistor Rugged Linear Regulator with Monitors LT381: Wide Safe Operating Area (SOA 3. LT381 IN 2.5 Older Regulator I LOAD /5 1µA/ C 5µA + OUT I MON TEMP SET I LIM 1k 1k 3.1k 6.4k 1µF* *OPTIONAL 3 Ω* I OUT 1.5V 1.5A Limit (A Older Regulator LT381 Increased Safe Area Input-to- Differential LT383: Adjustable 3A Single Resistor Low Regulator LT38 V CONTROL 3.3V 4.7µF V CONTROL 1.5V 1µF IN LT383 SET R SET 18.2k OUT.1µF 1µF * R MIN 99Ω =.9V I MAX = 3A *OPTIONAL FOR MINIMUM 1mA LOAD REQUIREMENT

7 (A Min Max (µa (Supply (μa V Capable, Single-Resistor Set, -Based NPN Positive Linear Regulators Noise (µv RMS w/ C SET LT382.2 1.2 4 1 1.3 5μA Adj ( to 38.

9 7 (A Min Max (µa (Supply (μa V Capable, Single-Resistor Set, -Based NPN Positive Linear Regulators Noise (µv RMS w/ C SET LT μA Adj ( to E I MP 3x3 DFN-8, TSOT-23-8, SOT-223 LT mA Adj ( to E I MP 2x3 DFN-6, MSOP-8E LT (1.35, SOT-223 1mA Adj ( to E I 3x3 DFN-8, MSOP-8E, SOT-223, TO-22, DD-Pak LT38-1* mA Adj ( to E I 3x3 DFN-8, MSOP-8E LT381 # mA Adj ( to E I 4x4 DFN-12, TSSOP-16E, TO-22, DD-Pak LT386 # mA Adj (.4 to 32 4 E I MP 4x5 DFN-16, TSSOP-16E, TO-22, DDPak LT / mA Adj ( to 7.5 or to E I MP 4x4 DFN-12, TSSOP-16E, TO-22, DD-Pak * Integrated Ballast Resistor DD-Pak and TO-22 s Dual-Supply Operation #Power Good PNP pass transistor LDO+ Range (ma Sources Initial Accuracy (% Min Max Regulation (ppm/v Quiescent (µa Reverse Protection Reverse Protection Limiting Thermal Protection LM334 1µA to 1mA yes C T-92, SO-8 LT392.5 to <1 3 yes yes yes yes E I MP TSOT-8, SOT-223, 3x3 DFN-8

10 8 NPN Positive Linear Regulators First generation NPN positive linear regulator family: Based on Classic 3-Terminal Architecture Wide Input Wide LT 1584/5A/7: Low Fast Response Positive Regulator Adjustable & Fixed vs V + C1 1µF * REQUIRED FOR STABILITY LT1584: C2 = 22µF, LT1585/LT1587: C2 = 1µF LT LT LT V 7A, 4.6A, 3A C2* SOLID TANTALUM INPUT/OUTPUT DIFFERENTIAL OUTPUT CURRENT (A I FULL LOAD (A Min Max (Supply (ma Noise (µv RMS or % of NPN Positive Linear Regulators LT Adj, 2.85, 3.3, 5.3% C I DD-Pak, SOT-223 LT1118.4/ Adj, 2.5, 2.85, 5 C SO-8, SOT-223 LT Adj, 2.85, 3.3, 3.6, 5, 12.3% C I DD-Pak, TO-22 LT Adj, 3.3, 3.6, 5, 12.3% C I DD-Pak, TO-22, TO-3P LT Adj, 1.5, 3.3, 3.38, 3.45, 3.6.3% C DD-Pak, TO-22 LT Adj, 1.5, 3.3, 3.38, 3.45, 3.6.3% C DD-Pak, TO-22 LT1585A Adj, 1.5, 3.3.3% C DD-Pak, TO-22 LT Adj, 3.3, 3.6, 5, 12.3% C I DD-Pak, TO-22, TO-3P LT Adj, 3.3, 3.38, 3.45, 3.6.3% C I DD-Pak, TO-22 LT * Adj, 2.5 C I DD-Pak, TO-22 LT Adj, 3.3, 3.6, 5, 12.3% C DD-Pak, TO-22 LT * Adj, 2.5 C TO-22 * Dual-Supply Operation

11 9 Very Low (VLDO Positive Linear Regulators VLDO regulator family features: Input Operation Down to.9v Down to.2v Typical Performance 15mV Enabling low -to- Differential Applications LT322 Minimum Input LTC325-x LT322: 1A,.9V to 1V, Very Low Linear Regulator I L = 1A 1.2V 1µF IN OUT LT322 SHDN ADJ µF.9V 1A MINIMUM INPUT VOLTAGE TEMPERATURE ( C LTC 325-x: 5mA Positive Low Noise LDO Regulator 1MHz Supply Rejection 5 Li-Ion OR 3-CELL NiMH 1.5V HIGH EFFICIENCY DC/DC BUCK 1.5V.1µF.1µF OFF ON BIAS OUT LTC325-2 IN SENSE SHDN 1µF = 1.2V I OUT 5mA REJECTION (db C OUT = 1µF C OUT = 1µF BIAS = 3.6V = 1.2V I OUT = 1mA I OUT = 3mA (A Min Max (Supply (μa Noise (µv RMS or % of VLDO Positive Linear Regulators LT Adj (.2 to 9.5, 245 E I MSOP-8, 3x3 DFN-8 1.2, 1.5, 1.8 LTC Adj (1.25 to 6, 1.5, 6 E TSOT-5 1.8, 2.5, 2.8, 3.3 LTC Adj (.4 to E 2x2 DFN-6 LTC Adj (.4 to E 2x3 DFN-8 LT Adj (.2 to 9.5, 1.2, 1.5, E I 5x5 DFN-16, SO-8 LTC325-x Adj (.4 to 3.6, 8 E I 2x2 DFN-6 1.2, 1.5, 1.8 LT Adj (.2 to 9.5, 165 E I 3x5 DFN-16, TSSOP-16E 1.2, 1.5, 1.8 LTC / # Adj (.4 to * or 21 E I 3x3 DFN-1, MSOP-1E * Boost Disabled Boost Enabled LDO+ # = 3.5V

1 NMOS Positive Linear Regulators for Digital IC Power Our family of NMOS positive linear regulators has the performance demanded by modern high current, low voltage digital ICs: Ultrafast Transient

Regulator V BIAS 2.2V TO 3.6V 2.2µF 5k BIAS 1.2 PWRGD 33µF EN SENSE V O OUT V O1 LT37 V O2 MARGSEL MARGTOL VIOC REF/BYP 1nF PWRGD 2.2µF* 4.7µF* *X5R OR X7R CAPACITORS.1µF 1µF*.

12 1 NMOS Positive Linear Regulators for Digital IC Power Our family of NMOS positive linear regulators has the performance demanded by modern high current, low voltage digital ICs: Ultrafast Transient Response Very Low High Low Good Power Supply Rejection Ratio (PSRR LT37 VIOC Control of Upstream Buck Regulator for to Regulation across LT37/71 LT37: 5A, Low Noise, Programmable, 85mV Linear Regulator V BIAS 2.2V TO 3.6V 2.2µF 5k BIAS 1.2 PWRGD 33µF EN SENSE V O OUT V O1 LT37 V O2 MARGSEL MARGTOL VIOC REF/BYP 1nF PWRGD 2.2µF* 4.7µF* *X5R OR X7R CAPACITORS.1µF 1µF*.9V 5A DROPOUT VOLTAGE (mv = (NOMINAL = 1.8V V BIAS = 3.3V =.8V V BIAS = 2.5V OUTPUT CURRENT (A LT371: 5A, Low Noise, Programmable, 85mV Linear Regulator with Analog Margining Transient Load Response V BIAS 5k 2.2V TO 3.6V 2.2µF BIAS 1.2 PWRGD 33µF EN V O SENSE OUT V O1 LT371 PWRGD 2.2µF* 4.7µF* 1µF*.9V 5A 5mV/DIV AC-COUPLED 1nF NC V O2 MARGA VIOC I MON REF/BYP *X5R OR X7R CAPACITORS 1k.1µF V MON 2V AT 5A FULL SCALE I OUT 2A/DIV I = 5mA TO 5A = 1V 2µs/DIV C OUT = 1µF + 4.7µF + 2.2µF I OUT t RISE /t FALL = 1ns (A Min NMOS Positive Linear Regulators Max (Supply (μa Noise (µv RMS or % of LT37* # mA Adj (.8 to E I MP 4x5 QFN-28 LT mA Adj (.8 to E I MP 4x5 QFN-28 LT / /1.5mA Adj (.6 to E I MP 4x7 QFN-36, TSSOP-38E * Digital Margining Analog Margining LDO+ #Power Good Future product, contact factory for information.

11 Negative Linear Regulators Rugged and hard to kill negative linear regulator family features: Low Noise Wide Range Low Reverse Protection LT39 LT39: 36V, 6mA Negative Linear Regulator with

5V : 2V C OUT : 4.7µF, C SET :.1µF I L : 6mA LT315: 1.5A, Low Noise, Negative LDO Regulator with Precision Limit 5.5V TO 3V 3.48k 1µF LT315 1µF SHDN IN ADJ OUT 1.5k 5V 1.5A DROPOUT VOLTAGE.

13 11 Negative Linear Regulators Rugged and hard to kill negative linear regulator family features: Low Noise Wide Range Low Reverse Protection LT39 LT39: 36V, 6mA Negative Linear Regulator with Programmable Limit Noise: 1Hz to 1kHz.1µF 49.9k 3.32k TO ADC (IMON 4.7µF LT39 SET + IMONP OUT 2.5V MAX I OUT 6mA 1µV/DIV 3V TO 1V 4.7µF IN 5µA SHDN 1k ILIM IMONN.1µF 3.3V 1ms/DIV : 3.5V : 2V C OUT : 4.7µF, C SET :.1µF I L : 6mA LT315: 1.5A, Low Noise, Negative LDO Regulator with Precision Limit 5.5V TO 3V 3.48k 1µF LT315 1µF SHDN IN ADJ OUT 1.5k 5V 1.5A DROPOUT VOLTAGE.45 T J = 25 C LOAD CURRENT (ma (A Min Max (Supply (μa Noise (µv RMS or % of Negative Linear Regulators LT Adj, 5 3 E I TSOT-5, 3x3 DFN-8 LT Adj, C I MP SOT-223, SO-8, DIP-8, DD-Pak, TO-22 LT39* µA.3 1mA Adj ( to E I H MP 3x3 DFN-12, MSOP-12E LT mA Adj ( 1.22 to 3 6 E I MP DD-Pak, TO-22, MSOP-12E, 3x3 DFN-8 LT mA Adj ( 2.37 to 3 49 C I DD-Pak, TO-22 Dual Positive and Negative Linear Regulators LT332 ±.15 ±1.9 ±2 ±1.22.3/ Adj, ±3.3, ±5, ±12, ±15 2 / 3 E I MP 3x4 DFN-14 * LDO+

12 Linear Regulator Controllers Linear regulator controller family features: An Off-Board Power Device Reduced On-Chip Power Dissipation Spreads Heat More Evenly on a PC Board LT315: Fast Transient

5k C IN : PANASONIC SP SERIES EEFUEE221R 2% C1: AVX TAJA475M2R 2V 2% L1: MURATA LQH32CN1K11 OR SUMIDA CDRH3D161 L1 1µH 5.1 5pF Si441 243 12 + C IN 22µF 2.5V x2 2.2µF x1 X5R CERAMIC 85 CASE 1.8V 1.

2a to 5A Load Step FB COMP C C 1pF R C 1k C TIME 5V + LATCH SHDN LT1573 DRIVE C IN 1F TANT R D 24 R B 5 C OUT1 1F CER X 24 + + Q OUT MOTOROLA D45H11 C OUT2 22F TANT = 1.

14 12 Linear Regulator Controllers Linear regulator controller family features: An Off-Board Power Device Reduced On-Chip Power Dissipation Spreads Heat More Evenly on a PC Board LT315: Fast Transient Response, Low Input, LDO Controller LT315 Transient Response for.1a to 4A Load Step MBR52L + C1 4.7µF 6.19k 1.37k LT315 2 SW FB1 1 SHDN2 SHDN1 SW I POS I NEG GATE FB2 COMP 68pF 1.5k C IN : PANASONIC SP SERIES EEFUEE221R 2% C1: AVX TAJA475M2R 2V 2% L1: MURATA LQH32CN1K11 OR SUMIDA CDRH3D161 L1 1µH 5.1 5pF Si C IN 22µF 2.5V x2 2.2µF x1 X5R CERAMIC 85 CASE 1.8V 1.5V 4A 5µV/DIV 2A/DIV 2μS/DIV LT1573: Low Regulator Controller Transient Response for.2a to 5A Load Step FB COMP C C 1pF R C 1k C TIME 5V + LATCH SHDN LT1573 DRIVE C IN 1F TANT R D 24 R B 5 C OUT1 1F CER X Q OUT MOTOROLA D45H11 C OUT2 22F TANT = 1.265V (1 + R1/R2 FOR T < 45C, C OUT1 = 24 x 1F Y5V CERAMIC SURFACE MOUNT CAPACITORS. FOR T > 45C, C OUT1 = 24 x 1F X7R CERAMIC SURFACE MOUNT CAPACITORS. PLACE C OUT1 IN THE MICROPROCESSOR SOCKET CAVITY R1 1.6k R2 1k LOAD 3.3V 5µV/DIV 2.5A/DIV 1μS/DIV (A Min Max Discrete Pass Element Drivers and Regulators Very Low (Supply (μa Noise (µv RMS or % of LT n/a 3 5 * 7 5 C SOT-223, TO-92 LT1573 5* * 1.7mA Adj, 2.5, 2.8, 3.3 C I SO-8 LT315 1* mA Adj C SSOP-16 LT1575 * n/a * 12mA Adj, 1.5, 2.8, 3.3, 5 C DIP-8, SO-8 LT1577 * n/a * 12mA Adj, 2.8, 3.3 C SO-16 * Depends On Selection of External Pass Device

15 13 Radiation Hardened (RH Linear Regulators Linear Technology manufactures a broad range of rugged radiation tolerant (rad hard voltage regulators that are ideal for space and military applications. We also partner with several outside vendors to provide monolithic packaged and hybrid products of Linear Technology RH DICE. Polarity (A Max. (Adj. Radiation Hardened (Rad Hard or RH Linear Regulators RH184 Positive V TO-3 RH186M Positive.5/ V Dice, TO 3, TO 39 RH117 Positive.5/ V Dice, TO 3, TO 39 RH137 Negative V Dice, TO 3, TO 39 RH1573 Positive V Dice RH1185 Negative V Dice RH38* Positive uA Dice RH383* Positive µA Dice * Source s Robert Dobkin, New Linear Regulators Solve Old Problems, Linear Technology Corporation, Application Note 142, August 213 Jim Williams, Load Transient Response Testing for Regulators, Linear Technology Corporation, Application Note 14, October 26. Jim Williams, Minimizing Switching Regulator Residue in Linear Regulator s, Linear Technology Corporation, Application Note 11, July 25. Todd Owen and Jim Williams, Performance Verification of Low Noise, Low Regulators, Linear Technology Corporation, Application Note 83, March 2. Craig Varga, LT1575 Ultrafast Linear Controller Makes Fast Transient Response Power Supplies, Linear Technology Corporation, Application Note 69, September 1996 (see Appendix A, Using PCB Material as Low Value Resistors. Goran Perica, Ceramic Input Capacitors Can Cause Overvoltage Transients, Linear Technology Corporation, Application Note 88, March 21. Bill Roehr, Mounting Considerations for Power Semiconductors, ON Semiconductor, Application Note 14/D, May 21. Tom Gross, LDO Linear Regulators Rival Switchers for Efficiency, Linear Technology Corporation, Linear Technology Magazine, May 25. LT1963A 1.5A, Low Noise, Fast Transient Response LDO Regulator data sheet, Linear Technology Corporation. All reference materials listed above are available at Videos / Video Product Briefs LT39 LT315 LT37/71 LT38 LT381 LT386 LT39 LT392 All videos listed above are available at

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LOW DROPOUT (LDO) LINEAR REGULATORS SELECTION GUIDE

LOW DROP (LDO) LEAR REGULATORS SELECTI GUIDE Visit analog.com 2 Introduction Analog Devices Power by Linear product group produces a broad line of high performance low dropout (LDO) linear regulators.