LT8607JMSE-5#PBF

LT8607 AD | Alldatasheet

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Rev. DFor more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 42V, 750mA Synchronous Step-Down Regulator with 2.5µA Quiescent Current The LT®8607 is a compact, high efficiency, high speed syn- chronous monolithic step-down switching regulator that consumes only 1.7µA of non-switching quiescent current. The LT8607 can deliver 750mA of continuous current. Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to pro- gram VIN undervoltage lockout or to shut down the LT8607 reducing the input supply current to 1µA. The MSOP package includes a SYNC pin to synchronize to an external clock, or to select Burst Mode operation or pulse-skipping with or without spread spectrum ; the TR/SS pin programs soft-start or tracking. The DFN package omits these pins and can be purchased in pulse- skipping or Burst Mode operation.

APPLICATIONS

n Wide Input Voltage Range: 3.0V to 42V n Ultralow Quiescent Current Burst Mode® Operation n <3µA IQ Regulating 12VIN to 3.3VOUT n Output Ripple <10mVP-P n High Efficiency 2MHz Synchronous Operation n >93% Efficiency at 0.5A, 12VIN to 5VOUT n 750mA Maximum Continuous Output n Fast Minimum Switch-On Time: 35ns n LT8607 Available in Fixed 5V Output n Adjustable and Synchronizable: 200kHz to 2.2MHz n Spread Spectrum Frequency Modulation for Low EMI n Allows Use of Small Inductors n Low Dropout n Peak Current Mode Operation n Accurate 1V Enable Pin Threshold n Internal Compensation n Output Soft-Start and T racking n Small Thermally Enhanced 10-Lead MSOP Package or 8-Lead 2mm × 2mm DFN Package n AEC-Q100 Qualified for Automotive Applications General Purpose Step-Down Converter Low EMI Step Down All registered trademarks and trademarks are the property of their respective owners. 5V, 2MHz Step-Down 12VIN to 5VOUT Efficiency f SW = 2MHz L = 4.7µH I OUT (mA) 125 250 375 500 625 750 100 EFFICIENCY (%)

8607 TA01b

PART NUMBER PACKAGE OUTPUT VOL TAGE SYNC FUNCTIONALITY LT8607MSE MSE Programmable Programmable LT8607-5MSE MSE Fixed 5V Out Programmable LT8607DFN DFN Programmable Burst Mode Operation LT8607BDFN DFN Programmable Pulse-Skipping Mode 0.1µF 4.7µF 1µF 22µF X7R 1206 10pF 4.7µH 18.2k 1MΩ 187k 100k 10nF V IN EN/UV SYNC L T8607 INTV CC TR/SS RT GND FB PG SW BST V IN 5.7V TO 42V V OUT 750mA POWER GOOD f SW = 2MHz

8607 TA01a

Rev. D For more information www.analog.com ABSOLUTE MAXIMUM RATINGS (Note 1) LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8607EMSE#PBF LT8607EMSE#TRPBF L TGXJ 10-Lead Plastic MSOP –40°C to 125°C LT8607IMSE#PBF LT8607IMSE#TRPBF L TGXJ 10-Lead Plastic MSOP –40°C to 125°C LT8607HMSE#PBF LT8607HMSE#TRPBF L TGXJ 10-Lead Plastic MSOP –40°C to 150°C LT8607EMSE-5#PBF LT8607EMSE-5#TRPBF L THNY 10-Lead Plastic MSOP –40°C to 125°C LT8607JMSE-5#PBF LT8607JMSE-5#TRPBF L THNY 10-Lead Plastic MSOP –40°C to 150°C LT8607EDC#TRMPBF LT8607EDC#TRPBF LGXK 8-Lead Plastic (2mm × 2mm) DFN –40°C to 125°C LT8607IDC#TRMPBF LT8607IDC#TRPBF LGXK 8-Lead Plastic (2mm × 2mm) DFN –40°C to 125°C LT8607HDC#TRMPBF LT8607HDC#TRPBF LGXK 8-Lead Plastic (2mm × 2mm) DFN –40°C to 150°C LT8607BEDC#TRMPBF LT8607BEDC#TRPBF LGXM 8-Lead Plastic (2mm × 2mm) DFN –40°C to 125°C LT8607BIDC#TRMPBF LT8607BIDC#TRPBF LGXM 8-Lead Plastic (2mm × 2mm) DFN –40°C to 125°C LT8607BHDC#TRMPBF LT8607BHDC#TRPBF LGXM 8-Lead Plastic (2mm × 2mm) DFN –40°C to 150°C ORDER INFORMATION LT8607 LT8607-5 LT8607/LT8607B BST SW INTVCC RT SYNC EN/UV VIN PG TR/SS FB TOP VIEW GND MSE PACKAGE 10-LEAD PLASTIC MSOP θJA = 40°C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB BST SW INTVCC RT SYNC EN/UV VIN PG TR/SS VOUT TOP VIEW GND MSE PACKAGE 10-LEAD PLASTIC MSOP θJA = 40°C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB TOP VIEW BST SW INTVCC RT EN/UV VIN PG FB DC PACKAGE 8-LEAD (2mm × 2mm) PLASTIC DFN θJA = 102°C/W EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB GND 3 6 PIN CONFIGURATION Operating Junction Temperature Range (Note 2)

Rev. DFor more information www.analog.com LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE AUTOMOTIVE PRODUCTS** LT8607EMSE#WPBF LT8607EMSE#WTRPBF L TGXJ 10-Lead Plastic MSOP –40°C to 125°C LT8607IMSE#WPBF LT8607IMSE#WTRPBF L TGXJ 10-Lead Plastic MSOP –40°C to 125°C LT8607JMSE#WPBF LT8607JMSE#WTRPBF L TGXJ 10-Lead Plastic MSOP –40°C to 150°C LT8607HMSE#WPBF LT8607HMSE#WTRPBF L TGXJ 10-Lead Plastic MSOP –40°C to 150°C LT8607EMSE-5#WPBF LT8607EMSE-5#WTRPBF L THNY 10-Lead Plastic MSOP –40°C to 125°C LT8607JMSE-5#WPBF LT8607JMSE-5#WTRPBF L THNY 10-Lead Plastic MSOP –40°C to 150°C LT8607EDC#WTRMPBF LT8607EDC#WTRPBF LGXK 8-Lead Plastic (2mm × 2mm) DFN –40°C to 125°C LT8607IDC#WTRMPBF LT8607IDC#WTRPBF LGXK 8-Lead Plastic (2mm × 2mm) DFN –40°C to 125°C LT8607JDC#WTRMPBF LT8607JDC#WTRPBF LGXK 8-Lead Plastic (2mm × 2mm) DFN –40°C to 150°C LT8607HDC#WTRMPBF LT8607HDC#WTRPBF LGXK 8-Lead Plastic (2mm × 2mm) DFN –40°C to 150°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container . Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage l 2.5 3.0 3.2 V VIN Current in Regulation LT8607/LT8607B V IN = 6V, VOUT = 2.7V, Output Load = 100µA V IN = 6V, VOUT = 2.7V, Output Load = 1mA l l 500 700 µA µA LT8607-5 V IN = 12V, VOUT = 5V, ILOAD = 100µA V IN = 12V, VOUT = 5V, ILOAD = 1mA l l 500 700 µA µA Feedback Reference Voltage LT8607 MSOP Package V IN = 6V, ILOAD = 100mA V IN = 6V, ILOAD = 100mA l 0.774 0.762 0.778 0.778 0.782 0.798 V V LT8607/LT8607B DFN Package V IN = 6V, ILOAD = 100mA V IN = 6V, ILOAD = 100mA l 0.771 0.753 0.778 0.778 0.785 0.803 V V Output Reference Voltage LT8607-5 V IN = 12V, ILOAD = 100mA V IN = 12V, ILOAD = 100mA l 4.970 4.890 5.030 5.110 V V Feedback Voltage Line Regulation LT8607/LT8607B V IN = 4.0V to 40V l 0.02 0.04 %/V Output Voltage Line Regulation LT8607-5 V IN = 6.0V to 40V l 0.02 0.04 %/V ORDER INFORMATION

Rev. D For more information www.analog.com Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT8607E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization, and correlation with statistical process controls. The LT8607I is guaranteed over the full –40°C to 125°C operating junction temperature range. The LT8607H is guaranteed over the full –40°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Note 3: This IC includes overtemperature protection that is intended to protect the device during overload conditions. Junction temperature will exceed 150°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature will reduce lifetime. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Feedback Pin Input Current LT8607/LT8607B V FB = 1.0V l ±20 nA Output Pin Input Current LT8607-5 V OUT = 6.0V l 900 nA Minimum On-Time ILOAD = 500mA, SYNC = 0V or LT8607 DFN ILOAD = 500mA, SYNC = 1.9V or LT8607B DFN l l ns ns Minimum Off Time ILOAD = 300mA l 93 130 ns Oscillator Frequency MSOP Package RT = 221k, ILOAD = 350mA RT = 60.4k, ILOAD = 350mA RT = 18.2k, ILOAD = 350mA l l l 155 640 1.90 200 700 2.00 245 760 2.10 kHz kHz MHz RT = 221k, ILOAD = 350mA RT = 60.4k, ILOAD = 350mA RT = 18.2k, ILOAD = 350mA l l l 140 610 1.85 200 700 2.00 260 790 2.15 kHz kHz MHz Top Power NMOS On-Resistance ILOAD = 500mA 375 mΩ Top Power NMOS Current Limit MSOP Package l 1.2 1.6 2.0 A Bottom Power NMOS On-Resistance 240 mΩ SW Leakage Current VIN = 36V 5 µA EN/UV Pin Threshold EN/UV Rising l 0.99 1.05 1.11 V EN/UV Pin Hysteresis 50 mV EN/UV Pin Current VEN/UV = 2V ±20 nA PG Upper Threshold Offset from VFB VFB Rising l 5.0 8.5 13.0 % PG Lower Threshold Offset from VFB VFB Falling l 5.0 8.5 13.0 % PG Hysteresis 0.5 % PG Leakage VPG = 42V ±200 nA PG Pull-Down Resistance VPG = 0.1V 550 1200 Ω Sync Low Input Voltage MSOP Only l 0.4 0.9 V Sync High Input Voltage INTVCC = 3.5V, MSOP Only l 2.7 3.2 V TR/SS Source Current MSOP Only l 1 2 3 µA TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V, MSOP Only 300 900 Ω Spread Spectrum Modulation Frequency VSYNC = 3.3V, MSOP Only 0.5 3 6 kHz

Rev. DFor more information www.analog.com TYPICAL PERFORMANCE CHARACTERISTICS Efficiency (5V Output, Burst Mode Operation) Efficiency (5V Output, Burst Mode Operation) Efficiency (3.3V Output, Burst Mode Operation) Efficiency (3.3V Output, Burst Mode Operation) FB Voltage Load Regulation Line Regulation INPUT VOL TAGE (V) –0.20 –0.15 –0.10 –0.05 0.00 0.05 0.10 0.15 0.20 CHANGE IN V OUT (%)

8607 G08

TEMPERATURE (°C) –50 –10 110 150 775 776 777 778 779 780 FB REGULATION VOL TAGE (mV)

8607 G05

OUTPUT CURRENT (mA) 125 250 375 500 625 750 –0.25 –0.20 –0.15 –0.10 –0.05 0.00 0.05 0.10 0.15 0.20 0.25 CHANGE IN V OUT (%)

8607 G07

TA = 25°C, unless otherwise noted. f SW = 2MHz V IN = 12V V IN = 24V L = 4.7µH SYNC = 0V OR L T8607 DFN I OUT (mA) 125 250 375 500 625 750 100 EFFICIENCY (%)

8607 G01

f SW = 2MHz V IN = 12V V IN = 24V L = 4.7µH I OUT (mA) 0.001 0.01 0.1 100 900 100 EFFICIENCY (%)

8607 G02

SYNC = 0V OR L T8607 DFN f SW = 2MHz V IN = 12V V IN = 24V L = 2.2µH I OUT (mA) 125 250 375 500 625 750 100 EFFICIENCY (%)

8607 G03

SYNC = 0V OR L T8607 DFN f SW = 2MHz V IN = 12V V IN = 24V L = 2.2µH I OUT (mA) 0.001 0.01 0.1 100 900 100 EFFICIENCY (%)

8607 G04

SYNC = 0V OR L T8607 DFN VOUT Voltage No-Load Supply Current (3.3V Output Switching) L = 2.2µH INPUT VOL TAGE (V) 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 I IN (µA)

8607 G09

SYNC = 0V OR L T8607 DFN TEMPERATURE (°C) –50 –10 110 150 4.97 4.98 4.99 5.00 5.01 5.02 FB REGULATION VOL TAGE (V) OUT

8607 G06

Rev. D For more information www.analog.com DUTY CYCLE (%) 100 1.20 1.30 1.40 1.50 1.60 1.70 TOP FET CURRENT LIMIT (A)

8607 G12

SWITCH CURRENT (mA) 125 250 375 500 625 750 100 150 200 250 300 SWITCH DROP (mV)

8607 G15

DUTY CYCLE = 0 TEMPERATURE (°C) –50 –10 110 150 1.50 1.55 1.60 1.65 1.70 TOP FET CURRENT LIMIT (A)

8607 G13

I OUT = 750mA TEMPERATURE (°C) –50 –30 –10 110 130 150 MINIMUM ON-TIME (ns)

8607 G16

SWITCH CURRENT = 750mA TOP SW BOT SW TEMPERATURE (°C) –50 –30 –10 110 130 150 100 150 200 250 300 350 400 450 SWITCH DROP (mV)

8607 G14

I OUT = 350mA TEMPERATURE (°C) –50 –30 –10 110 130 150 100 105 110 MINIMUM OFF-TIME (ns)

8607 G17

TYPICAL PERFORMANCE CHARACTERISTICS Top MOSFET Current Limit vs Duty Cycle Top MOSFET Current Limit vs Temperature Switch Drop vs Temperature Switch Drop vs Switch Current Minimum On-Time vs Temperature Minimum Off-Time vs Temperature Dropout Voltage vs Output Current L: XFL4020-472ME OUTPUT CURRENT (A) 125 250 375 500 625 750 100 150 200 250 300 350 DROPOUT VOL TAGE (mV)

8607 G18

TA = 25°C, unless otherwise noted. No-Load Supply Current (5V Output Switching) No Load Supply Current vs Temperature (Not Switching) TEMPERATURE (°C) –50 –10 110 150 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 INPUT CURRENT (µA)

8607 G11

SYNC = 0V OR L T8607 DFN SYNC = 0V INPUT VOL TAGE (V) 1.70 1.80 1.90 2.00 2.10 2.20 I IN (µA) (5V Output Switching)

8607 G10

L = 4.7µH

Rev. DFor more information www.analog.com Switching Frequency vs Temperature Burst Frequency vs Output Current R T = 18.2kΩ TEMPERATURE (°C) –50 –10 110 150 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025 SWITCHING FREQUENCY (kHz)

8607 G19

SYNC = 0V OR L T8607 DFN OUTPUT CURRENT (mA) 100 125 250 500 750 1000 1250 1500 1750 2000 2250 2500 SWITCHING FREQUENCY (kHz)

8607 G20

V IN = 12V L = 2.2µH V OUT = 3.3V TYPICAL PERFORMANCE CHARACTERISTICS Minimum Load to Full Frequency (SYNC Float to 1.9V) (MSOP Package) or LT8607B DFN Frequency Foldback Soft-Start T racking (MSOP Package) Soft-Start Current vs Temperature (MSOP Package) Start-Up DropoutVIN UVLO vs Temperature Start-Up Dropout INPUT VOL TAGE (V) 100 125 150 OUTPUT CURRENT (mA)

8607 G21

V IN = 12V L = 2.2µH V OUT = 3.3V R T = 18.2kΩ SS VOL TAGE (V) 0.1 0.2 0.4 0.5 0.6 0.7 0.8 1.0 1.1 1.2 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 FB VOL TAGE (V)

8607 G23

TEMPERATURE (°C) –50 –30 –10 110 130 150 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 SOFT-START CURRENT (µA)

8607 G24

V IN V OUT R LOAD = 50Ω INPUT VOL TAGE (V) INPUT VOL TAGE (V) OUTPUT VOL TAGE (V)

8607 G26

TEMPERATURE (°C) –50 –30 –10 110 130 150 2.00 2.25 2.50 2.75 3.00 3.25 V IN UVLO (V)

8607 G25

V IN V OUT R LOAD = 6.66Ω INPUT VOL TAGE (V) INPUT VOL TAGE (V) OUTPUT VOL TAGE (V)

8607 G27

TA = 25°C, unless otherwise noted. FB VOL TAGE (V) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 250 500 750 1000 1250 1500 1750 2000 2250 2500 FREQUENCY (kHz)

8607 G22

SYNC = 0V OR L T8607 DFN

Rev. D For more information www.analog.com TYPICAL PERFORMANCE CHARACTERISTICS Switching Waveforms Switching Waveforms T ransient Response Switching Waveforms (Burst Mode) T ransient Response 200ns/DIV ILOAD 200mA/DIV VSW 5V/DIV

8607 G2812VIN TO 5VOUT AT 500mA

200µs/DIV ILOAD 200mA/DIV VOUT 100mV/DIV

8607 G31VIN =12V

VOUT = 5V 50mA TO 550mA COUT = 22µF fSW = 2MHz 100µs/DIV ILOAD 200mA/DIV VOUT 100mV/DIV

8607 G32VIN =12V

VOUT = 5V 250mA TO 750mA COUT = 22µF fSW = 2MHz 200ns/DIV ILOAD 200mA/DIV VSW 10V/DIV

8607 G2936VIN TO 5VOUT AT 500mA

2µs/DIV VOUT 20mV/DIV ILOAD 200mA/DIV VSW 10V/DIV 8607 G3012VIN TO 5VOUT AT 7.5mA 22µF COUT TA = 25°C, unless otherwise noted. Radiated EMI Performance (CISPR 25 Radiated Emission Test with Class 5 Peak Limits) FREQUENCY (MHz) AMPLITUDE (dBµV/m) –10

8607 G33

0 500 900300 700 1000400 800200 600100 VERTICAL POLARIZATION PEAK DETECTOR CLASS 5 PEAK LIMIT SPREAD SPECTRUM MODE FIXED FREQUENCY DC2565A DEMO BOARD WITH EMI FIL TER INSTALLED 14V INPUT TO 5V OUTPUT AT 500mA, fSW = 2MHz

Rev. DFor more information www.analog.com PIN FUNCTIONS BST: This pin is used to provide a drive voltage, higher than the input voltage, to the topside power switch. Place a 0.1µF boost capacitor as close as possible to the IC. Do not place a resistor in series with this pin. SW: The SW pin is the output of the internal power switches. Connect this pin to the inductor and boost capacitor . This node should be kept small on the PCB for good performance. INTVCC: Internal 3.5V Regulator Bypass Pin. The internal power drivers and control circuits are powered from this voltage. INTVCC max output current is 20mA. Voltage on INTVCC will vary between 2.8V and 3.5V. Decouple this pin to power ground with at least a 1µF low ESR ceramic capacitor . Do not load the INTVCC pin with external circuitry. RT: A resistor is tied between RT and ground to set the switching frequency. When synchronizing, the RT resistor should be chosen to set the LT8607 switching frequency to equal or below the lowest synchronization input. SYNC (MSOP Only) : External Clock Synchronization Input. Ground this pin for low ripple Burst Mode operation at low output loads. Tie to a clock source for synchroni - zation to an external frequency. Leave floating for pulse- skipping mode with no spread spectrum modulation. Tie to INTVCC or tie to a voltage between 3.2V and 5.0V for pulse-skipping mode with spread spectrum modulation. When in pulse-skipping mode, the I Q regulating no load will increase to several mA. There is no SYNC pin on the LT8607 DFN package. The LT8607 DFN internally ties SYNC to ground. The LT8607B package internally floats SYNC. FB (LT8607/LT8607B Only): The LT8607 regulates the FB pin to 0.778V. Connect the feedback resistor divider tap to this pin. VOUT (LT8607-5 Only): The LT8607-5 regulates the VOUT pin to 5V. This pin connects to a 6.6MΩ internal divider . TR/SS (MSOP Only): Output T racking and Soft-Start Pin. This pin allows user control of output voltage ramp rate during start-up. A TR/SS voltage below 0.778V forces the LT8607 to regulate the FB pin to equal the TR/SS pin volt- age. The LT8607-5 will track the TR/SS pin voltage based on a factor set by the internal resistor divider . The part will track to 6.43 times the TR/SS voltage. When TR/SS is above 0.778V, the tracking function is disabled and the internal reference resumes control of the error amplifier . An internal 2µA pull-up current from INTVCC on this pin allows a capacitor to program output voltage slew rate. This pin is pulled to ground with a 300Ω MOSFET dur- ing shutdown and fault conditions ; use a series resistor if driving from a low impedance output. There is no TR/ SS pin on the LT8607 or LT8607B DFN and the node is internally floated. PG: The PG pin is the open-drain output of an internal comparator . PG remains low until the FB pin is within ±8.5% of the final regulation voltage, and there are no fault conditions. PG is valid when V IN is above 3.2V and when EN/UV is high. PG is pulled low when VIN is above 3.2V and EN/UV is low. If VIN is near zero, PG will be high impedance. VIN: The VIN pin supplies current to the LT8607 internal circuitry and to the internal topside power switch. This pin must be locally bypassed. Be sure to place the positive terminal of the input capacitor as close as possible to the VIN pins, and the negative capacitor terminal as close as possible to the GND pins. EN/UV: The LT8607 is shut down when this pin is low and active when this pin is high. The hysteretic threshold volt- age is 1.05V going up and 1.00V going down. Tie to VIN if the shutdown feature is not used. An external resistor divider from VIN can be used to program a VIN threshold below which the LT8607 will shut down. GND: Exposed Pad Pin. The exposed pad must be con - nected to the negative terminal of the input capaci - tor and soldered to the PCB in order to lower the thermal resistance.

Rev. D For more information www.analog.com BLOCK DIAGRAM ++– SLOPE COMP INTERNAL 0.778V REF OSCILLATOR 200kHz TO 2.2MHz BURST DETECT 3.5V REG CBST COUT VOUT 8607 BD SW L BST SWITCH LOGIC AND ANTI- SHOOT THROUGH ERROR AMP SHDN ±8.5% VC SHDN TSD INTVCC UVLO VIN UVLO L T8607-5 ONL Y L T8607/L T8607B ONL Y SHDN TSD VIN UVLO EN/UV 1V + RT SYNC (MSOP ONL Y) INTVCC GND PGVOUT RPG FB R1CFF OPT OPT RTCSS OPT VOUT TR/SS (MSOP ONL Y) 2µA VINVIN CIN CVCC CFF VOUT VOUT

Rev. DFor more information www.analog.com OPERATION The LT8607 is a monolithic constant frequency current mode step-down DC/DC converter . An oscillator with frequency set using a resistor on the RT pin turns on the internal top power switch at the beginning of each clock cycle. Current in the inductor then increases until the top switch current comparator trips and turns off the top power switch. The peak inductor current at which the top switch turns off is controlled by the voltage on the internal VC node. The error amplifier servos the VC node by comparing the voltage on the VFB pin with an internal 0.778V reference. The LT8607-5 fixed output part uses the VOUT pin and an internal resistor divider to generate an internal FB node. When the load current increases, it causes a reduction in the feedback voltage relative to the reference leading the error amplifier to raise the VC volt- age until the average inductor current matches the new load current. When the top power switch turns off the synchronous power switch turns on until the next clock cycle begins or inductor current falls to zero. If overload conditions result in excess current flowing through the bottom switch, the next clock cycle will be delayed until switch current returns to a safe level. If the EN/UV pin is low, the LT8607 is shut down and draws 1µA from the input. When the EN/UV pin is above 1.05V, the switching regulator becomes active. To optimize efficiency at light loads, the LT8607 enters Burst Mode operation during light load situations. Between bursts, all circuitry associated with controlling the output switch is shut down, reducing the input supply current to 1.7µA. In a typical application, 3.0µA will be consumed from the input supply when regulating with no load. The SYNC pin is tied low to use Burst Mode operation and can be floated to use pulse-skipping mode. If a clock is applied to the SYNC pin the part will synchronize to an external clock frequency and operate in pulse-skipping mode. While in pulse-skipping mode the oscillator operates continu - ously and positive SW transitions are aligned to the clock. During light loads, switch pulses are skipped to regulate the output and the quiescent current will be several mA. The SYNC pin may be tied high for spread spectrum modu- lation mode, and the LT8607 will operate similar to pulse- skipping mode but vary the clock frequency to reduce EMI. The LT8607 DFN has no SYNC pin and will always operate in Burst Mode operation. The LT8607B has no SYNC pin and will operate in pulse-skipping mode. Comparators monitoring the FB pin voltage will pull the PG pin low if the output voltage varies more than ±8.5% (typi- cal) from the set point, or if a fault condition is present. In Burst Mode operation, the oscillator reduces the LT8607's operating frequency when the voltage at the FB pin is low, or the voltage at the VOUT pin is low on the LT8607-5 fixed output option. This frequency foldback helps to control the inductor current when the output volt- age is lower than the programmed value which occurs during start-up.

mode the LT8607 consumes 1.7µA. be minimized as it appears to the output as load current. capacitance will decrease the output ripple proportionally. Table 1. The output load at which the LT8607 reaches the output voltage, and inductor choice. Figure 1. Burst Frequency vs Output Current

8607 F02

8607 F03

8607 F01

Figure 2. Minimum Load to Full Frequency Figure 3. Burst Mode Operation

optimize the quiescent current at low loads. back divider resistance from the VOUT pin to ground. frequency is modulated upwards of the frequency set by RT. Table 1. SW Frequency vs RT Value tages are lower efficiency and a smaller input voltage range. control of inductor current to assure safe operation. dropped to achieve higher duty cycle.

Rev. D For more information www.analog.com APPLICATIONS INFORMATION Inductor Selection and Maximum Output Current The LT8607 is designed to minimize solution size by allowing the inductor to be chosen based on the output load requirements of the application. During overload or short circuit conditions the LT8607 safely tolerates opera- tion with a saturated inductor through the use of a high speed peak-current mode architecture. A good first choice for the inductor value is: L = VOUT +VSW(BOT) fSW

2 where fSW is the switching frequency in MHz, V OUT is the output voltage, V SW(BOT) is the bottom switch drop (~0.125V) and L is the inductor value in µH. To avoid overheating and poor efficiency, an inductor must be chosen with an RMS current rating that is greater than the maximum expected output load of the applica - tion. In addition, the saturation current (typically labeled ISAT) rating of the inductor must be higher than the load current plus 1/2 of in inductor ripple current: IL(PEAK) =ILOAD(MAX) + 1 2 ΔL where ∆IL is the inductor ripple current as calculated sev- eral paragraphs below and I LOAD(MAX) is the maximum output load for a given application. As a quick example, an application requiring 0.25A output should use an inductor with an RMS rating of greater than 0.5A and an I SAT of greater than 0.7A. To keep the efficiency high, the series resistance (DCR) should be less than 0.04Ω, and the core material should be intended for high frequency applications. The LT8607 limits the peak switch current in order to protect the switches and the system from overload faults. The top switch current limit (ILIM) is at least 1.2A at low duty cycles and decreases linearly to at least 0.9A at D = 0.8. The inductor value must then be sufficient to supply the desired maximum output current (I OUT(MAX)), which is a function of the switch current limit (I LIM) and the ripple current: IOUT(MAX) =ILIM – ΔIL The peak-to-peak ripple current in the inductor can be calculated as follows: ΔIL = VOUT L •fSW 1– VOUT VIN(MAX) where fSW is the switching frequency of the LT8607, and L is the value of the inductor . Therefore, the maximum output current that the LT8607 will deliver depends on the switch current limit, the inductor value, and the input and output voltages. The inductor value may have to be increased if the inductor ripple current does not allow sufficient maximum output current (IOUT(MAX)) given the switching frequency, and maximum input voltage used in the desired application. The optimum inductor for a given application may differ from the one indicated by this design guide. A larger value inductor provides a higher maximum load current and reduces the output voltage ripple. For applications requir- ing smaller load currents, the value of the inductor may be lower and the LT8607 may operate with higher ripple current. This allows use of a physically smaller inductor , or one with a lower DCR resulting in higher efficiency. Be aware that low inductance may result in discontinuous mode operation, which further reduces maximum load current. For more information about maximum output current and discontinuous operation, see Analog Devices Application Note 44. Finally, for duty cycles greater than 50% (VOUT/VIN > 0.5), a minimum inductance is required to avoid sub-harmonic oscillation. See Analog Devices Application Note 19. Input Capacitor Bypass the input of the LT8607 circuit with a ceramic capacitor of X7R or X5R type. Y5V types have poor per - formance over temperature and applied voltage, and should not be used. A 4.7µF to 10µF ceramic capacitor is adequate to bypass the LT8607 and will easily handle the ripple current. Note that larger input capacitance is required when a lower switching frequency is used. If the input power source has high impedance, or there is

Rev. DFor more information www.analog.com APPLICATIONS INFORMATION significant inductance due to long wires or cables, addi - tional bulk capacitance may be necessary. This can be provided with a low performance electrolytic capacitor . Step-down regulators draw current from the input sup - ply in pulses with very fast rise and fall times. The input capacitor is required to reduce the resulting voltage rip - ple at the LT8607 and to force this very high frequency switching current into a tight local loop, minimizing EMI. A 4.7µF capacitor is capable of this task, but only if it is placed close to the LT8607 (see the PCB Layout section). A second precaution regarding the ceramic input capaci- tor concerns the maximum input voltage rating of the LT8607. A ceramic input capacitor combined with trace or cable inductance forms a high quality (under damped) tank circuit. If the LT8607 circuit is plugged into a live supply, the input voltage can ring to twice its nominal value, possibly exceeding the LT8607’s voltage rating. This situation is easily avoided (see Analog Devices Application Note 88). Output Capacitor and Output Ripple The output capacitor has two essential functions. Along with the inductor , it filters the square wave generated by the LT8607 to produce the DC output. In this role it determines the output ripple, thus low impedance at the switching frequency is important. The second function is to store energy in order to satisfy transient loads and sta- bilize the LT8607’s control loop. Ceramic capacitors have very low equivalent series resistance (ESR) and provide the best ripple performance. A good starting value is: COUT = 100 VOUT • fSW where fSW is in MHz, and COUT is the recommended output capacitance in µF . Use X5R or X7R types. This choice will provide low output ripple and good transient response. T ransient performance can be improved with a higher value output capacitor and the addition of a feedforward capaci- tor placed between V OUT and FB. Increasing the output capacitance will also decrease the output voltage ripple. A lower value of output capacitor can be used to save space and cost but transient performance will suffer and may cause loop instability. See the Typical Applications in this data sheet for suggested capacitor values. When choosing a capacitor , special attention should be given to the data sheet to calculate the effective capaci - tance under the relevant operating conditions of voltage bias and temperature. A physically larger capacitor or one with a higher voltage rating may be required. Ceramic Capacitors Ceramic capacitors are small, robust and have very low ESR. However , ceramic capacitors can cause problems when used with the LT8607 due to their piezoelectric nature. When in Burst Mode operation, the LT8607’s switching frequency depends on the load current, and at very light loads the LT8607 can excite the ceramic capacitor at audio frequencies, generating audible noise. Since the LT8607 operates at a lower current limit during Burst Mode operation, the noise is typically very quiet to a casual ear . If this is unacceptable, use a high performance tantalum or electrolytic capacitor at the output. A final precaution regarding ceramic capacitors concerns the maximum input voltage rating of the LT8607. As pre- viously mentioned, a ceramic input capacitor combined with trace or cable inductance forms a high quality (under damped) tank circuit. If the LT8607 circuit is plugged into a live supply, the input voltage can ring to twice its nomi- nal value, possibly exceeding the LT8607’s rating. This situation is easily avoided (see Analog Devices Application Note 88). Enable Pin The LT8607 is in shutdown when the EN pin is low and active when the pin is high. The rising threshold of the EN comparator is 1.05V, with 50mV of hysteresis. The EN pin can be tied to VIN if the shutdown feature is not used, or tied to a logic level if shutdown control is required. Adding a resistor divider from V IN to EN programs the LT8607 to regulate the output only when V IN is above a desired voltage (see Block Diagram ). Typically, this threshold, VIN(EN), is used in situations where the input

Rev. D For more information www.analog.com supply is current limited, or has a relatively high source resistance. A switching regulator draws constant power from the source, so source current increases as source voltage drops. This looks like a negative resistance load to the source and can cause the source to current limit or latch low under low source voltage conditions. The VIN(EN) threshold prevents the regulator from operating at source voltages where the problems might occur . This threshold can be adjusted by setting the values R3 and R4 such that they satisfy the following equation: VIN(EN) = R3 R4 +1⎛ ⎝⎜ ⎞ ⎠⎟•1V where the LT8607 will remain off until VIN is above VIN(EN). Due to the comparator ’s hysteresis, switching will not stop until the input falls slightly below VIN(EN). When in Burst Mode operation for light-load currents, the current through the VIN(EN) resistor network can eas- ily be greater than the supply current consumed by the LT8607. Therefore, the VIN(EN) resistors should be large to minimize their effect on efficiency at low loads. INTVCC Regulator An internal low dropout (LDO) regulator produces the 3.5V supply from V IN that powers the drivers and the internal bias circuitry. The INTVCC can supply enough cur- rent for the LT8607’s circuitry and must be bypassed to ground with a minimum of 1µF ceramic capacitor . Good bypassing is necessary to supply the high transient currents required by the power MOSFET gate drivers. Applications with high input voltage and high switching frequency will increase die temperature because of the higher power dissipation across the LDO. Do not connect an external load to the INTVCC pin. Output Voltage T racking and Soft-Start (MSOP Only) The LT8607 allows the user to program its output voltage ramp rate by means of the TR/SS pin. An internal 2µA pulls up the TR/SS pin to INTV CC. Putting an external capacitor on TR/SS enables soft-starting the output to prevent current surge on the input supply. During the soft- start ramp the output voltage will proportionally track the TR/SS pin voltage. For output tracking applications, TR/SS APPLICATIONS INFORMATION can be externally driven by another voltage source. From 0V to 0.778V, the TR/SS voltage will override the internal 0.778V reference input to the error amplifier , thus regulat- ing the FB pin voltage to that of TR/SS pin. In the LT8607-5 fixed output option, the output voltage will track the TR/SS pin to 6.43 times the TR/SS voltage, a voltage based on a factor set by the internal feedback resistor divider . When TR/SS is above 0.778V, tracking is disabled and the feedback voltage will regulate to the internal reference voltage. An active pull-down circuit is connected to the TR/SS pin which will discharge the external soft-start capacitor in the case of fault conditions and restart the ramp when the faults are cleared. Fault conditions that clear the soft-start capacitor are the EN/UV pin transitioning low, V IN volt- age falling too low, or thermal shutdown. The LT8607 and LT8607B DFN does not have the TR/SS pin or functionality. Output Power Good When the LT8607’s output voltage is within the ±8.5% window of the regulation point, which is a VFB voltage in the range of 0.716V to 0.849V (typical), the output voltage is considered good and the open-drain PG pin goes high impedance and is typically pulled high with an external resistor . Otherwise, the internal drain pull-down device will pull the PG pin low. To prevent glitching both the upper and lower thresholds include 0.5% of hysteresis. The PG pin is also actively pulled low during several fault conditions: EN/UV pin is below 1V, INTVCC has fallen too low, VIN is too low, or thermal shutdown. Synchronization (MSOP Only) To select low ripple Burst Mode operation, tie the SYNC pin below 0.4V (this can be ground or a logic low output). To synchronize the LT8607 oscillator to an external frequency connect a square wave (with 20% to 80% duty cycle) to the SYNC pin. The square wave amplitude should have valleys that are below 0.9V and peaks above 2.7V (up to 5V). The LT8607 will not enter Burst Mode operation at low output loads while synchronized to an external clock, but instead will pulse skip to maintain regulation. The LT8607 may be synchronized over a 200kHz to 2.2MHz range. The

synchronization frequencies. ences come at the expense of increased quiescent current. To enable pulse-skipping mode the SYNC pin is floated. during short circuit conditions. switching if the inductor current exceeds safe levels. other supply is diode ORed with the LT8607’s output. grounded the SW pin current will drop to near 0.7µA. against a shorted or reversed input.

8607 F04

Figure 4. Reverse VIN Protection

planes within the circuit board and on the bottom side. placement with trace, ground plane and via locations. temperature approaches the maximum junction rating. a fault condition if safe junction temperature is exceeded. placing the capacitor adjacent to the V IN and GND pins. Figure 5. PCB Layout

8607 F05GND VIA VIN VIA VOUT VIA EN/UV VIA OTHER SIGNAL VIA

Rev. DFor more information www.analog.com TYPICAL APPLICATIONS 5V, 2MHz Step-Down 3.3V, 2MHz Step-Down 12V, 1MHz Step-Down 0.1µF 4.7µF X7R 1206 1µF 22µF X7R 1206

8607 TA02

4.7µH 18.2k 1MΩ 187k L1: XFL4020-472ME 100k 10nF V IN EN/UV SYNC L T8607 INTV CC TR/SS RT GND FB PG SW BST V IN 5.6V TO 42V V OUT 750mA POWER GOOD f SW = 2MHz 0.1µF 4.7µF X7R 1206 1µF 22µF X7R 1206

8607 TA03

2.2µH 18.2k 1MΩ 309k L1: XFL3012-222ME 100k 10nF V IN EN/UV SYNC L T8607 INTV CC TR/SS RT GND FB PG SW BST V IN 3.9V TO 42V V OUT 3.3V 750mA POWER GOOD f SW = 2MHz 0.1µF 4.7µF X7R 1206 1µF 22µF X7R 1206

8607 TA04

22µH 40.2k 1MΩ 69.8k L1: MSS6132-223ML 100k 10nF V IN EN/UV SYNC L T8607 INTV CC TR/SS RT GND FB PG SW BST V IN 12.7V TO 42V V OUT 12V 750mA POWER GOOD f SW = 1MHz

Rev. D For more information www.analog.com TYPICAL APPLICATIONS 1.8V, 2MHz Step-Down Ultralow EMI, 5V, 1.5A Step-Down 5V, 2MHz Step-Down 0.1µF 4.7µF 1µF 22µF X7R 1206

8607 TA05

2.2µH 18.2k 1MΩ 768k L1: XFL3012-222ME 100k 10nF V IN EN/UV SYNC L T8607 INTV CC TR/SS RT GND FB PG SW BST V IN 3.2V TO 20V (42V TRANSIENT) V OUT 1.8V 750mA POWER GOOD f SW = 2MHz 0.1µF 4.7µF 33µF 4.7µF 4.7µF 1µF 22µF X7R 1206

8607 TA06

22µH 4.7µH BEAD 110k 1MΩ 187k C2, C7, C8: X7R 1206 C9: 63SXV33M L1: MSS6132-223 L2: BKP2125HS101-T 100k 10nF V IN EN/UV SYNC L T8607 (MSOP) INTV CC TR/SS RT GND FB PG SW BST V OUT 750mA POWER GOOD f SW = 400kHz V IN 5.8V TO 40V 0.1µF 4.7µF X7R 1206 1µF 22µF X7R 1206

8607 TA07

4.7µH 18.2k L1: XFL4020-472ME 100k 10nF V IN EN/UV SYNC L T8607-5 INTV CC TR/SS RT GND FB PG SW BST V IN 5.6V TO 42V V OUT 750mA POWER GOOD f SW = 2MHz

Rev. DFor more information www.analog.com PACKAGE DESCRIPTION MSOP (MSE) 0213 REV I 0.53 ±0.152 (.021 ±.006) SEATING PLANE 0.18 (.007) 1.10 (.043) MAX 0.17 –/uni00A00.27 (.007 – .011) TYP 0.86 (.034) REF 0.50 (.0197) BSC 1 2 3 4 5 4.90 ±0.152 (.193 ±.006) 0.497 ±0.076 (.0196 ±.003) REF8910 7 6 3.00 ±0.102 (.118 ±.004) (NOTE 3) 3.00 ±0.102 (.118 ±.004) (NOTE 4) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL NOT EXCEED 0.254mm (.010") PER SIDE. 0.254 (.010) 0° – 6° TYP DETAIL “A” DETAIL “A” GAUGE PLANE 5.10 (.201) MIN 3.20 – 3.45 (.126 – .136) 0.889 ±0.127 (.035 ±.005) RECOMMENDED SOLDER PAD LAYOUT 1.68 ±0.102 (.066 ±.004) 1.88 ±0.102 (.074 ±.004) 0.50 (.0197) BSC 0.305 ± 0.038 (.0120 ±.0015) TYP BOTTOM VIEW OF EXPOSED PAD OPTION 1.68 (.066) 1.88 (.074) 0.1016 ±0.0508 (.004 ±.002) DETAIL “B” DETAIL “B” CORNER TAIL IS PART OF THE LEADFRAME FEATURE. FOR REFERENCE ONL Y NO MEASUREMENT PURPOSE

0.05 REF

0.29 REF 10-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1664 Rev I)

Rev. D For more information www.analog.com PACKAGE DESCRIPTION 2.00 ±0.05 (4 SIDES) 2.00 SQ ±0.05 NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.55 ±0.05 BOTTOM VIEW—EXPOSED PAD 0.23 REF0.335 REF

0.335 REF

0.75 ±0.05 PIN 1 BAR TOP MARK (SEE NOTE 6)

0.200 REF

0.00 – 0.05 (DC8MA) DFN 0113 REV Ø 0.23 ±0.05

0.45 BSC

0.25 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 0.90 REF 0.23 REF 0.85 ±0.05

1.8 REF

2.60 ±0.05 PACKAGE OUTLINE R = 0.15 8-Lead Plastic DFN (2mm × 2mm) (Reference LTC DWG # 05-08-1939 Rev Ø) Exposed Pad Variation AA

Rev. DFor more information www.analog.com Information furnished by Analog Devices is believed to be accurate and reliable. However , no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER A 06/17 Added DFN package option. Clarified electrical parameters for DFN package option. Clarified graphs for MSOP package option. Clarified Pins Functions for DFN package option. Clarified Operation to include DFN option. Clarified Applications last paragraph and Figure 2 to include DFN option. Clarified Applications section to include DFN operation. Added DFN Package Description. 1, 2 2, 3 14, 15 B 11/17 Added H-grade option Clarified Oscillator Frequency RT conditions Clarified efficiency graph Clarified Block Diagram Added Figure 5 Clarified Typical Applications for MSOP package option 2, 3 18, 22 C 11/18 Added B version Added table to clarify versions Modified text in Description to add DFN functionality Added B version to Order Information Clarified Minimum On-Time Conditions Clarified efficiency graphs Clarified Burst Frequency vs Output Current graph Clarified Minimum Load to Full Frequency and Frequency Foldback graphs Clarified Pin Functions on SYNC and TR/SS Clarified Operation third paragraph Clarified last paragraph to include DFN B version and Figures 1, 3 Clarified Applications to include DFN B version Clarified PCB Layout All D 01/21 Added AEC-Q100 Qualified for Automotive Applications Added Fixed 5V Output Replaced table Added new Pin Configuration Fixed ordering information for DC package Added #W Materials Updated EC Table Added VOUT Voltage and Load Supply graphs Added VOUT comment for LT8607-5 Added FB comment for LT8607/LT8607B only Added TR/SS Updated Block diagram Updated Operations Updated Applications information Output Voltage T racking and Soft-Start (MSOP Only) Added 5V, 2MHz Step-Down Typical Application 3-4 5-6

Rev. D For more information www.analog.com  ANALOG DEVICES, INC. 2017-2021 www.analog.com PART NUMBER DESCRIPTION COMMENTS LT8606 42V, 350mA, 92% Efficiency, 2.2MHz Synchronous MicroPower Step-Down DC/DC Converter with IQ = 3µA VIN: 3V to 42V, VOUT = 0.778V, IQ = 3µA, ISD = <1µA, LT8608 42V, 1.5A, 92% Efficiency, 2.2MHz Synchronous MicroPower Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3V to 42V, VOUT = 0.778V, IQ = 2.5µA, ISD = <1µA, LT8609/LT8609A/ LT8609B 42V, 2A/3A Peak, 93% Efficiency, 2.2MHz Synchronous MicroPower Step- Down DC/DC Converter with IQ = 2.5µA VIN: 3V to 42V, VOUT = 0.782V, IQ = 2.5µA, ISD = <1µA, LT8609S 42V, 2A/3A Peak, 93% Efficiency, 2.2MHz Synchronous Silent Switcher® 2 Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3V to 42V, VOUT = 0.774V, IQ = 2.5µA, ISD = <1µA, 3mm × 3mm LQFN-16 Package LT8610A/LT8610AB/ LT8610AC 42V, 3.5A, 96% Efficiency, 2.2MHz Synchronous MicroPower Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3.4V to 42V, VOUT = 0.97V, IQ = 2.5µA, ISD = <1µA, LT8616 42V, Dual 2.5A + 1.5A, 95% Efficiency, 2.2MHz Synchronous MicroPower Step-Down DC/DC Converter with IQ = 5µA VIN: 3.4V to 42V, VOUT = 0.8V, IQ = 5µA, ISD = <1µA, TSSOP-28E, 3mm × 6mm QFN-28 Packages LT8620 65V, 2.5A, 96% Efficiency, 2.2MHz Synchronous MicroPower Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3.4V to 65V, VOUT = 0.97V, IQ = 2.5µA, ISD = <1µA, MSOP-16E 3mm × 5mm QFN-24 Packages LT8614 42V, 4A, 96% Efficiency, 2.2MHz Synchronous MicroPower Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3.4V to 42V, VOUT = 0.97V, IQ = 2.5µA, ISD = <1µA, 3mm × 4mm QFN-18 Package LT8612 42V, 6A, 96% Efficiency, 2.2MHz Synchronous MicroPower Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3.4V to 42V, VOUT = 0.97V, IQ = 3µA, ISD = <1µA, 3mm × 6mm QFN-28 Package LT8640 42V, 5A, 96% Efficiency, 3MHz Synchronous MicroPower Step-Down DC/ DC Converter with IQ = 2.5µA VIN: 3.4V to 42V, VOUT = 0.97V, IQ = 2.5µA, ISD = <1µA, 3mm × 4mm QFN-18 Package LT8640S 42V, 6A, 96% Efficiency, 3MHz Synchronous Silent Switcher 2 Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3.4V to 42V, VOUT = 0.97V, IQ = 2.5µA, ISD = <1µA, 4mm × 4mm LQFN-24 Package LT8645S 65V, 8A, 96% Efficiency, 3MHz Synchronous Silent Switcher 2 Step-Down DC/DC Converter with IQ = 2.5µA VIN: 3.4V to 65V, VOUT = 0.97V, IQ = 2.5µA, ISD = <1µA, 4mm × 6mm LQFN-32 Package Synchronous MicroPower Step-Down DC/DC Converter with IQ = 25µA VIN: 3V to 42V, VOUT = 0.8V, IQ = 25µA, ISD = <1µA, 6mm × 6mm QFN-40 Package RELATED PARTS TYPICAL APPLICATION 5V and 3.3V with Ratio T racking 0.1µF 4.7µF C10 22µF 2.2µH 18.2k R10 22k 1MΩ 309k L2: XFL3012-222ME C2, C4, C8, C10: X7R 1206 100k C12 1µF V IN EN/UV SYNC L T8607 (MSOP) INTV CC TR/SS RT GND FB PG SW BST V OUT 3.3V 750mA POWER GOOD f SW = 2MHz 0.1µF 4.7µF 1µF 22µF 10pF 4.7µH 18.2k 1MΩ 187k L1: XFL4020-472ME 100k 10nF V IN EN/UV SYNC L T8607 (MSOP) INTV CC TR/SS RT GND FB PG SW BST V IN 5.7V TO 42V V OUT 5.0V 750mA POWER GOOD f SW = 2MHz 80.6k

Summary

42V, 750mA Synchronous Step-Down Regulator with 2.5關A Quiescent Current 01/21-REV.D

Description