LT8335 - Low IQ Boost/SEPIC/ Inverting Converter with 2A, 28V Switch
Document overview
- Manufacturer or author: Linear Technology Corporation
- PDF pages: 20
Technical content
8335fFor more information www.linear .com/L T8335 TYPICAL APPLICATION FEATURES DESCRIPTION Low IQ Boost/SEPIC/ Inverting Converter with 2A, 28V Switch The LT®8335 is a current mode DC/DC converter capable of generating either positive or negative output voltages using a single feedback pin. It can be configured as a boost, SEPIC or inverting converter consuming as low as 6µA of quiescent current. Low ripple Burst Mode opera - tion maintains high efficiency down to very low output currents while keeping the output ripple below 15mV in a typical application. The internally compensated current mode architecture results in stable operation over a wide range of input and output voltages. Integrated soft-start and frequency foldback functions are included to control inductor current during start-up. The 2MHz operation combined with the small 8-lead DFN package, enables low cost, area efficient solutions. 3V to 6V Input, 12V Boost Converter
APPLICATIONS
n 3V to 25V Input Voltage Range n Ultralow Quiescent Current and Low Ripple Burst Mode ® Operation: IQ = 6µA n 2A, 28V Power Switch n Positive or Negative Output Voltage Programming with a Single Feedback Pin n Fixed 2MHz Switching Frequency n Programmable Undervoltage Lockout (UVLO) n Internal Compensation and Soft-Start n Low Profile (0.75mm) 8-Lead (3mm × 2mm) DFN Package n Industrial and Automotive n Telecom n Medical Diagnostic Equipment n Portable Electronics L, LT, LT C, LT M, Linear Technology, the Linear logo and Burst Mode are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Efficiency and Power Loss EFFICIENCY POWER LOSS V IN = 3V V IN = 5V V IN = 6V LOAD CURRENT (mA) 100 200 300 400 500 600 100 200 400 600 800 1000 EFFICIENCY (%) POWER LOSS (mW)
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4.7µF 1µF V OUT V IN SW FBX GND EN/UVLO L T8335 VIN 3V TO 6V 12V V CC INT 1.2µH 22µF 4.7pF 275mA AT V IN = 3V 440mA AT V IN = 5V 520mA AT V IN = 6V
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8335f For more information www.linear .com/L T8335 ABSOLUTE MAXIMUM RATINGS EN/U O perating Junction Temperature (Note 3) LT83 40°C to 125°C 65°C to 150°C (Note 1) ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT8335EDDB#PBF LT8335EDDB#TRPBF LGVM 8-Lead (3mm × 2mm) Plastic DFN –40°C to 125°C LT8335IDDB#PBF LT8335IDDB#TRPBF LGVM 8-Lead (3mm × 2mm) Plastic DFN –40°C to 125°C Consult L TC Marketing for information on lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. TOP VIEW GND DDB PACKAGE 8-LEAD (3mm × 2mm) PLASTIC DFN
1 FBX
θJA = 80.5°C/W EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB PIN CONFIGURATION http://www.linear.com/product/LT8335#orderinfo
8335fFor more information www.linear .com/L T8335 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, EN/UVLO = 12V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Operating Voltage Range l 3 25 V VIN Quiescent Current at Shutdown V EN/UVLO = 0.2V l 0.9 µA µA VEN/UVLO = 1.5V l 3.6 9.5 µA µA VIN Quiescent Current Sleep Mode, Not Switching l 5.5 8.5 µA µA Active Mode, Not Switching l 780 840 1100 1200 µA µA FBX Regulation FBX Regulation Voltage FBX > 0V FBX < 0V l l 1.568 –0.820 1.6 –0.80 1.632 –0.780 V V FBX Line Regulation FBX > 0V, 3V < VIN < 25V FBX < 0V, 3V < VIN < 25V 0.005 0.005 0.015 0.015 %/V %/V FBX Pin Current FBX = 1.6V, –0.8V l –10 10 nA Oscillator Switching Frequency (fOSC) l 1.80 2.0 2.20 MHz Minimum On-Time 74 115 ns Minimum Off-Time 47 65 ns Switch Maximum Switch Current Limit Threshold l 2.0 2.5 3.0 A Switch RDS(ON) ISW = 0.5A 170 mΩ Switch Leakage Current VSW = 28V 0.1 1 µA EN/UVLO Logic EN/UVLO Pin Threshold (Rising) Start Switching l 1.620 1.68 1.745 V EN/UVLO Pin Threshold (Falling) Stop Switching l 1.556 1.60 1.644 V EN/UVLO Pin Current VEN/UVLO = 1.6V l –40 40 nA Soft-Start Soft-Start Time 1.2 ms 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. Note 2: INTV CC cannot be externally driven. No additional components or loading is allowed on this pin. Note 3: The LT8335E 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 LT8335I is guaranteed over the full –40°C to 125°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Note 4: The 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.
8335f For more information www.linear .com/L T8335 TYPICAL PERFORMANCE CHARACTERISTICS Switching Frequency vs Temperature Switching Frequency vs VIN Normalized Switching Frequency vs FBX Voltage Switch Current Limit vs Duty Cycle Switch Minimum On-Time vs Temperature Switch Minimum Off-Time vs Temperature FBX Positive Regulation Voltage vs Temperature FBX Negative Regulation Voltage vs Temperature EN/UVLO Pin Thresholds vs Temperature V IN = 12V JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 1.570 1.580 1.590 1.600 1.610 1.620 1.630 FBX VOL TAGE (V)
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V IN = 12V JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 –0.815 –0.810 –0.805 –0.800 –0.795 –0.790 –0.785 FBX VOL TAGE (V)
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V IN = 12V JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 1.90 1.92 1.94 1.96 1.98 2.00 2.02 2.04 2.06 2.08 2.10 SWITCHING FREQUENCY (MHz)
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V IN (V) 1.85 1.90 1.95 2.00 2.05 2.10 2.15 SWITCHING FREQUENCY (MHz)
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V IN = 12V FBX VOL TAGE (V) –0.8 –0.4 0.0 0.4 0.8 1.2 1.6 100 125 NORMALIZED SWITCHING FREQUENCY (%)
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V IN = 12V DUTY CYCLE (%) 100 2.1 2.3 2.5 2.7 2.9 SWITCH CURRENT LIMIT (A)
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V IN = 12V JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 100 110 120 MINIMUM ON–TIME (nS)
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V IN = 12V JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 MINIMUM OFF–TIME (ns)
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V IN = 12V EN/UVLO RISING (TURN-ON) EN/UVLO FALLING (TURN-OFF) JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 1.54 1.56 1.58 1.60 1.62 1.64 1.66 1.68 1.70 1.72 1.74 EN/UVLO PIN VOL TAGE (V)
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8335fFor more information www.linear .com/L T8335 TYPICAL PERFORMANCE CHARACTERISTICS Switching Waveforms (in CCM) Switching Waveforms (in DCM/Light Burst Mode) Switching Waveforms (in Deep Burst Mode) V OUT T ransient Response: Load Current T ransients from 200mA to 440mA to 200mA V IN Pin Current (Sleep Mode, Not Switching) vs Temperature VIN Pin Current (Active Mode, Not Switching) vs Temperature Burst Frequency vs Load Current VOUT T ransient Response: Load Current T ransients from 40mA to 440mA to 40mA V IN = 12V JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 1.25 2.50 3.75 5.00 6.25 7.50 8.75 10.00 V IN PIN CURRENT (µA)
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V IN = 12V JUNCTION TEMPERATURE (°C) –50 –25 100 125 150 175 600 650 700 750 800 850 900 950 1000 V IN PIN CURRENT (µA)
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V IN = 5V , V OUT = 12V LOAD CURRENT (mA) 100 150 200 0.5 1.0 1.5 2.0 2.5 SWITCHING FREQUENCY (MHz)
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V IN = 5V , V OUT = 12V , I LOAD = 440mA 1µs/DIV FRONT PAGE APPLICATION V SW 5V/DIV IL 500mA/DIV
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V IN = 5V , V OUT = 12V , I LOAD = 100mA 1µs/DIV FRONT PAGE APPLICATION V SW 5V/DIV
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V IN = 5V , V OUT = 12V , I LOAD = 10mA 1µs/DIV FRONT PAGE APPLICATION V SW 5A/DIV
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Front Page Application: V IN = 5V , V OUT = 12V 100µs/DIV V OUT 200mV/DIV I LOAD 200mA/DIV
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Front Page Application: V IN = 5V , V OUT = 12V 100µs/DIV V OUT 200mV/DIV I LOAD 200mA/DIV
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8335f For more information www.linear .com/L T8335 PIN FUNCTIONS EN/UVLO: Shutdown and Undervoltage Detect Pin. The LT8335 is shut down when this pin is low and active when this pin is high. Below an accurate 1.6V threshold the part enters undervoltage lockout and stops switching. This allows an undervoltage lockout (UVLO) threshold to be programmed for system input voltage by resistively dividing down system input voltage to the EN/UVLO pin. An 80mV pin hysteresis ensures part switching resumes when the pin exceeds 1.68V. EN/UVLO pin voltage below 0.2V reduces V IN current below 1µA. If shutdown and UVLO features are not required, the pin can be tied directly to system input. FBX: Voltage Regulation Feedback Pin for Positive or Negative Outputs. Connect this pin to a resistor divider between the output and GND. FBX reduces the switching frequency during start-up and fault conditions when FBX is close to GND. GND: Ground Connection for the LT8335. The DFN package has an exposed pad (Pin 9) on the bottom of the package. This exposed pad must be soldered to a ground plane. Pin 5 should also be connected to a ground plane. The ground plane should be connected to large copper layers to spread heat dissipated by the LT8335. INTV CC: Regulated 3V Supply for Internal Loads. The INTVCC pin must be bypassed with a minimum 1µF low ESR ceramic capacitor to ground. No additional components or loading is allowed on this pin. NC: No Internal Connection. Tie directly to local ground. SW: The Output of Internal Power Switch. Minimize the metal trace area connected to this pin to reduce EMI. V IN: Input Supply. This pin must be locally bypassed. Be sure to place the positive terminal of the input capacitor as close as possible to the VIN pin, and the negative terminal as close as possible to the GND pin.
8335fFor more information www.linear .com/L T8335 BLOCK DIAGRAM GND 8335 BD ERROR AMP SELECT FREQUENCY FOLDBACK INTVCC UVLO OSCILLATOR 2MHz SWITCH LOGIC BURST DETECT ERROR AMP ERROR AMP SLOPE VC SLOPE SOFT-START 1.6V FBX VOUT –0.8V UVLO DRIVER ILIMIT RSENSE PWM COMPARATOR INTVCC TJ > 170°C A6 1.68V(+) 1.6V(–) EN/UVLO INTERNAL REFERENCE UVLO VIN CIN SW OPT OPT VIN COUT CVCC DL VOUT UVLO 3V REGULATOR
peak switch current level to keep the output in regulation. performs (non-inverting) amplification from FBX to VC. enters undervoltage lockout (UVLO), and stops switching. Figure 1. Burst Frequency vs Load Current
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capacitance will decrease the output ripple proportionally. defined by the internal oscillator as shown in Figure 1. Figure 2. Burst Mode Operation at which the IC turns on and off (see the Block Diagram). operation. A logic input can also control the EN/UVLO pin. minimize their effect on efficiency at light loads. required by the internal power MOSFET gate driver. (to stop switching and reset soft start) is typically 2.5V. in the Electrical Characteristics table).
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available output power and reduced efficiency. inductor saturation or power switch failure. Figure 3. Soft-Start Waveforms its final value while limiting the start-up peak currents. the output voltage and supply current come up gradually. VC and hence inductor peak current.
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the part will stop switching and go into thermal lockout. of the total switch current. and shapes are available from various manufacturers. Table 1. Inductor Manufacturers be provided with a low performance electrolytic capacitor. cerns the maximum input voltage rating of the LT8335. easily avoided (see Application Note 88). be used at the output to minimize the output ripple voltage. capacitor, can affect the stability of the overall system. and can generally be ignored.
value for the zero frequency is between 30kHz to 60kHz. across the feedback resistor from output to FBX pin). when used with the LT8335 due to their piezoelectric nature. eration, the noise is typically very quiet to a casual ear. capacitors are also available. Figure 4. Suggested Boost Converter Layout Table 2. Ceramic Capacitor Manufacturers A Schottky diode is recommended for use with the LT8335. voltage ratings for the target applications. Table 3. Recommended Schottky Diodes
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JA) values listed in the Pin Configuration section. Inverting converters are analyzed below. in continuous conduction mode (CCM). are specified in the Electrical Characteristics table. are applied to L1 and L2 throughout the switching cycle. Figure 5. LT8335 Configured in a SEPIC Topology
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It is recommended to have a ∆I SW of 600mA or more. loop gain (the converter will approach voltage mode). will fall in the range of 1µH to 47µH. equal to the maximum average inductor currents. Figure 6. The Switch Current Waveform of the SEPIC Converter
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margin (a 4V safety margin is usually sufficient). exceed the diode maximum junction temperature rating. SEPIC converter are similar to those of the boost converter. in continuous conduction mode (CCM). OUT) and the input voltage (VIN). Figure 7. A Simplified Inverting Converter
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8335f For more information www.linear .com/L T8335 Be sure to check that DMAX and DMIN obey : DMAX < 1-Minimum Off-Time(MAX) • fOSC(MAX) and DMIN > Minimum On-Time(MAX) • fOSC(MAX) where Minimum Off-Time, Minimum On-Time and f OSC are specified in the Electrical Characteristics table. Inverting Converter: Inductor, Output Diode and Input Capacitor Selections The selections of the inductor, output diode and input capacitor of an inverting converter are similar to those of the SEPIC converter. Please refer to the corresponding SEPIC converter sections. Inverting Converter: Output Capacitor Selection The inverting converter requires much smaller output capacitors than those of the boost, flyback and SEPIC converters for similar output ripples. This is due to the fact that, in the inverting converter, the inductor L2 is in series with the output, and the ripple current flowing through the output capacitors are continuous. The output ripple voltage is produced by the ripple current of L2 flowing through the ESR and bulk capacitance of the output capacitor: ΔVOUT(P–P) = ΔIL2 ESRCOUT + 1 8 f COUT After specifying the maximum output ripple, the user can select the output capacitors according to the preceding equation. The ESR can be minimized by using high quality X5R or X7R dielectric ceramic capacitors. In many applications, ceramic capacitors are sufficient to limit the output volt- age ripple. The RMS ripple current rating of the output capacitor needs to be greater than: IRMS(COUT) > 0.3 • ∆IL2 Inverting Converter: Selecting the DC Coupling Capacitor The DC voltage rating of the DC coupling capacitor (CDC, as shown in Figure 7) should be larger than the maximum input voltage minus the output voltage (negative voltage): VCDC > VIN(MAX) – VOUT CDC has nearly a rectangular current waveform. During the switch off-time, the current through CDC is IIN, while approximately –I O flows during the on-time. The RMS rating of the coupling capacitor is determined by the fol- lowing equation: IRMS(CDC) >IO(MAX) DMAX 1−DMAX A low ESR and ESL, X5R or X7R ceramic capacitor works well for CDC. APPLICATIONS INFORMATION
8335fFor more information www.linear .com/L T8335 TYPICAL APPLICATIONS 3V to 6V Input, 12V Boost Converter Efficiency 8V to 16V Input, 24V Boost Converter Efficiency 3V to 6V Input, 24V Boost Converter Efficiency 22µF 154k
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4.7µF 1µF 4.7pF V OUT 275mA AT V IN = 3V V IN SW FBX GND EN/UVLO L T8335 3V TO 6V 1.2µH V IN 12V 440mA AT V IN = 5V V CC INT 520mA AT V IN = 6V D1: ROHM RB060MM-30 L1: COOPER SD25-1R2 C3: MURATA GRM32ER71E226K V IN = 3V V IN = 5V V IN = 6V LOAD CURRENT (mA) 100 200 300 400 500 600 100 EFFICIENCY (%)
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10µF 71.5k
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4.7µF 1µF 4.7pF 287k V OUT 400mA AT V IN = 8V V IN SW FBX GND EN/UVLO L T8335 8V TO 16V 3.3µH V IN 24V 600mA AT V IN = 12V 800mA AT V IN = 16V V CC INT D1: ROHM RB060MM-30 L1: WURTH ELEKTRONIK WE-LQS 74404063033 C3: MURATA GRM32ER71H106K V IN = 8V V IN = 12V V IN = 16V LOAD CURRENT (mA) 100 200 300 400 500 600 700 800 100 EFFICIENCY (%)
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4.7µF 71.5k
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4.7µF 1µF 4.7pF V OUT 60mA AT V IN = 3V V IN SW FBX GND EN/UVLO L T8335 3V TO 6V 0.47µH V IN 24V 70mA AT V IN = 5V 80mA AT V IN = 6V V CC INT D1: NXP PMEG3010BEP L1: WURTH ELEKTRONIK WE-LHMI 744373240047 C3: MURATA GRM32ER71H475K V IN = 3V V IN = 5V V IN = 6V LOAD CURRENT (mA) EFFICIENCY (%)
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8335f For more information www.linear .com/L T8335 TYPICAL APPLICATIONS 5V to 12V Input, –12V Inverting Converter 4V to 16V Input, –5V Inverting Converter 4V to 16V Input, 5V SEPIC Converter Efficiency Efficiency Efficiency 22µF 71.5k 4.7µF 1µF 10pF
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1µF V OUT V IN SW FBX GND EN/UVLO L T8335 5V TO 12V 3.3uH V IN –12V V CC INT D1: NXP PMEG3010BEP L1, L2: WURTH ELEKTRONIK WE-LQS 74404054033 3.3µH 350mA AT V IN = 5V 450mA AT V IN = 12V C3: MURATA GRM32ER71E226K C5: MURATA GRM31CR71H105K 665k V IN = 5V V IN = 12V LOAD CURRENT (mA) 100 200 300 400 500 EFFICIENCY (%)
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47µF 191k 4.7µF 1µF 10pF
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1µF V OUT V IN SW FBX GND EN/UVLO L T8335 4V TO 16V 2.2µH 2.2µH V IN –5V V CC INT D1: ROHM RB060MM-30 L1, L2: COOPER DRQ73-2R2 550mA AT V IN = 4V 820mA AT V IN = 12V 850mA AT V IN = 16V C3: PANASONIC 6TPC47M C5: MURATA GRM31CR71H105K 806k V IN = 4V V IN = 12V V IN = 16V LOAD CURRENT (mA) 150 300 450 600 750 900 EFFICIENCY (%)
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22µF 232k
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4.7µF 1µF 5.6pF 1µF 806k V OUT V IN SW FBX GND EN/UVLO L T8335 4V TO 16V 1.8µH V IN V CC INT 499k D1: ROHM RB060MM-30 L1, L2: WURTH ELEKTRONIK IndDD 744877001 1.8µH 500mA AT V IN = 4V 550mA AT V IN = 5V 650mA AT V IN = 12V 700mA AT V IN = 16V C3: MURATA GRM31CR71A226K C5: MURATA GRM31MR71E105K V IN = 4V V IN = 5V V IN = 12V V IN = 16V LOAD CURRENT (mA) 150 300 450 600 750 EFFICIENCY (%)
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8335fFor more information www.linear .com/L T8335 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LT8335#packaging for the most recent package drawings. 2.00 ±0.10 (2 SIDES) NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE M0-229 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 0.40 ±0.10 BOTTOM VIEW—EXPOSED PAD 0.56 ±0.05 (2 SIDES) 0.75 ±0.05 R = 0.115 TYPR = 0.05 TYP 2.15 ±0.05 (2 SIDES) 3.00 ±0.10 (2 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6)
0.200 REF
0 – 0.05 (DDB8) DFN 0905 REV B 0.25 ±0.05
0.50 BSC
R = 0.20 OR 0.25 × 45° CHAMFER 0.25 ±0.05 2.20 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.61 ±0.05 (2 SIDES) 1.15 ±0.05 0.70 ±0.05 2.55 ±0.05 PACKAGE OUTLINE 8-Lead Plastic DFN (3mm × 2mm) (Reference LTC DWG # 05-08-1702 Rev B)
8335f For more information www.linear .com/L T8335 LINEAR TECHNOLOGY CORPORATION 2016 LT 0616 • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com/L T8335 RELATED PARTS TYPICAL APPLICATION 4V to 16V Input, ±5V Converter PART NUMBER DESCRIPTION COMMENTS LT1930/LT1930A 1A (ISW), 1.2MHz/2.2MHz High Efficiency Step-Up DC/DC Converter VIN = 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD < 1µA, ThinSOT Package LT1935 2A (ISW), 40V, 1.2MHz High Efficiency Step-Up DC/DC Converter VIN = 2.3V to 16V, VOUT(MAX) = 38V, IQ = 3mA, ISD < 1µA, ThinSOT Package LT3467 1.1A (ISW), 1.3MHz High Efficiency Step-Up DC/DC Converter VIN = 2.4V to 16V, VOUT(MAX) = 40V, IQ = 1.2mA, ISD < 1µA, ThinSOT, 2mm × 3mm DFN Packages LT3580 2A (ISW), 42V, 2.5MHz, High Efficiency Step-Up DC/DC Converter VIN = 2.5V to 32V, VOUT(MAX) = 42V, IQ = 1mA, ISD = <1µA, 3mm × 3mm DFN-8, MSOP-8E LT8330 1A (ISW), 60V, 2.0MHz High Efficiency Boost/SEPIC/ Inverting DC/DC Converter VIN = 3V to 40V, VOUT(MAX) = 60V, IQ = 6µA (Burst Mode Operation), ISD =< 1µA, ThinSOT, 2mm × 3mm DFN Packages LT8331 0.5A (ISW), 140V, 500kHz High Efficiency Boost/Flyback/ SEPIC/Inverting DC/DC Converter VIN = 4.5V to 100V, VOUT(MAX) = 135V, IQ = 6µA (Burst Mode Operation), ISD =< 1µA, MSOP-16(12)E LT8494 70V, 2A Boost/SEPIC 1.5MHz High Efficiency Step-Up DC/DC Converter VIN = 1V to 60V (2.5V to 32V Start-Up), VOUT(MAX) = 70V, IQ = 3µA (Burst Mode operation), ISD = <1µA, 20-Lead TSSOP LT8570/LT8570-1 65V, 500mA/250mA Boost/Inverting DC/DC Converter V IN(MIN) = 2.55V, VIN(MAX) = 40V, VOUT(MAX) = ±60V, IQ = 1.2mA, ISD = <1mA, 3mm × 3mm DFN-8, MSOP-8E LT8580 1A (ISW), 65V 1.5MHz, High Efficiency Step-Up DC/DC Converter VIN: 2.55V to 40V, VOUT(MAX) = 65V, IQ = 1.2mA, ISD = <1µA, 3mm × 3mm DFN-8, MSOP-8E Efficiency 22µF 232k
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4.7µF 1µF 1µF 806k 1µF 22µF 5.6pF OUT V IN SW FBX GND EN/UVLO L T8335 4V TO 16V 1.2µH 1.2µH V IN –5V V CC INT 499k D1, D2 : ROHM RB060MM-30 L1A, L1B, L1C : WURTH ELEKTRONIK TRANSFORMER 750316134 OUT +5V L1A L1B L1C 1.2µH LOAD 250mA AT V IN = 4V 300mA AT V IN = 12V 300mA AT V IN = 16V C3, C4 : MURATA GRM31CR71H105K OUT V IN = 4V V IN = 12V V IN = 16V LOAD CURRENT (mA) 100 150 200 250 300 EFFICIENCY (%)