LT1618EMS

LT1618EDDPBF LINER | Alldatasheet

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1618 step-up DC/DC converter combines a tradi- tional voltage feedback loop and a unique current feedback loop to operate as a constant-current, constant-voltage source. This fixed frequency, current mode switcher oper- ates from a wide input voltage range of 1.6V to 18V, and the high switching frequency of 1.4MHz permits the use of tiny, low profile inductors and capacitors. The current sense voltage is set at 50mV and can be adjusted using the I ADJ pin. Available in the 10-Pin (3mm × 3mm) Exposed Pad DFN and 10-pin MSOP packages, the LT1618 provides a com- plete solution for constant-current applications.■ LED Backlight Drivers ■ USB Powered Boost/SEPIC Converters ■ Input Current Limited Boost/SEPIC Converters ■ Battery Chargers , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Accurate Input/Output Current Control: ±5% Over Temperature ■ Accurate Output Voltage Control: ±1% ■ Wide VIN Range: 1.6V to 18V ■ 1.4MHz Switching Frequency ■ High Output Voltage: Up to 35V ■ Low VCESAT Switch: 200mV at 1A ■ Available in (3mm × 3mm × 0.8mm) 10-Pin DFN and 10-Pin MSOP Packages Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter Efficiency Curve USB to 12V Boost Converter (with Selectable 100mA/500mA Input Current Limit) LOAD CURRENT (mA) EFFICIENCY (%)

1618 TA01b

0 40 80 10020 60 120 140 160 OFF ON SHDN IADJ VC VIN VOUT 12V SWISN ISP FB LT1618 909k 107k VIN 4.7µF 10nF 4.7µF

1618 TA01a

10µH GND 51 04 C1: TAIYO YUDEN JMK212BJ475 C2: TAIYO YUDEN EMK316BJ475 D1: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR43-100 0.1Ω 13k 20k 3.3V 100mA 500mA 3.3V

TJMAX = 125°C, θJA = 160°C/W Consult LTC marketing for parts specified with wider operating temperature ranges. LT1618EDD ABSOLUTE AXI U RATI GSW WW U PACKAGE/ORDER I FOR ATIOUU W (Note 1) ORDER PART NUMBER LAFQ FB ISN ISP I ADJ GND V C SHDN VIN SW NC TOP VIEW MS PACKAGE 10-LEAD PLASTIC MSOP Operating Temperature Range (Note 2) .. – 40°C to 85°C Storage Temperature Range Lead Temperature (Soldering, 10 sec) (MSOP) .... 300°C MS PART MARKING LT1618EMS ORDER PART NUMBER LTNH TOP VIEW DD PACKAGE 10-LEAD (3mm × 3mm) PLASTIC DFN 1 VC SHDN VIN SW SW FB ISN ISP I ADJ GND TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W EXPOSED PAD (PIN 11) IS GND AND MUST BE SOLDERED TO PCB ELECTRICAL CHARACTERISTICSThe ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 1.6V, VSHDN = 1.6V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage 1.6 18 V Quiescent Current V SHDN = 1.6V, Not Switching 1.8 2.7 mA VSHDN = 0V 0.1 1 µA Reference Voltage Measured at FB Pin 1.250 1.263 1.276 V

• 1.243 1.263 1.283 V Reference Voltage Line Regulation 1.6V < V IN < 18V 0.01 0.03 %/V FB Pin Bias Current V FB = 1.263V, VIN = 1.8V ● ±2 ±12 nA Error Amplifier Voltage Gain 180 V/V Error Amplifier Transconductance ∆IC = ± 5µA 160 µmho Error Amplifier Sink Current V FB = 1.35V, VC = 1V 15 µA Error Amplifier Source Current V FB = 1.10V, VC = 1V 30 µA Current Sense Voltage (ISP, ISN) V FB = 0V, VIADJ = 0V ● 47.5 50 52.5 mV ISP, ISN Pin Bias Currents (Note 3) V ISP = 1.85V, VISN = 1.80V, VIADJ = 0V 50 80 µA (ISP, ISN) Common Mode Minimum Voltage 1.8 V Switching Frequency V FB = 1V 1.25 1.4 1.6 MHz VFB = 0V 550 kHz Maximum Switch Duty Cycle ● 88 92 % Switch Current Limit (Note 4) 1.5 2.1 2.8 A

TYPICAL PERFOR A CE CHARACTERISTICSUW TEMPERATURE (°C) –5 0 FEEDBACK VOLTAGE (V) 125

1618 G02

1.270 1.265 1.260 1.255 1.250 –2 5 2 5 5 0 100 VOLTAGE CURRENT FB PIN BIAS CURRENT (nA) TEMPERATURE (°C) –5 0 PEAK CURRENT (A) 125

1618 G03

2.5 2.0 1.5 1.0 0.5 –2 5 2 5 5 0 100 TEMPERATURE (°C) –5 0 CURRENT SENSE VOLTAGE (mV) 125

1618 G04

–2 5 2 5 5 0 100 IADJ PIN VOLTAGE (V) CURRENT SENSE VOLTAGE (mV)

1618 G05

TEMPERATURE (°C) –5 0 QUIESCENT CURRENT (mA) 125

1618 G06

2.5 2.0 1.5 1.0 0.5 –2 5 2 5 5 0 100 VIN = 18V VIN = 1.6V FB Pin Voltage and Bias Current Switch Current Limit Current Sense Voltage (IADJ Pin = 0V) Current Sense Voltage (VISP, ISN) Quiescent Current Switch Saturation Voltage (VCE, SAT) SWITCH CURRENT (A) SATURATION VOLTAGE (mV) 2.0

1618 G01

0.5 1.0 1.5 500 400 300 200 100 TJ = 125°C TJ = –50 °C TJ = 25°C Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1618 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40 °C to 85°C operating temperature range are assured by design, characterization, and correlation with statistical process controls. Note 3: Bias currents flow into the ISP and ISN pins. Note 4: Switch current limit and switch VCESAT for the DD package is guaranteed by design and/or correlation to static test. ELECTRICAL CHARACTERISTICSThe ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 1.6V, VSHDN = 1.6V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Switch VCESAT ISW = 1A (Note 4) 200 260 mV Switch Leakage Current Switch Off, V SW = 5V 0.01 5 µA SHDN Pin Current V SHDN = 1.6V 5 20 µA Shutdown Threshold (SHDN Pin) 0.3 V Start-Up Threshold (SHDN Pin) 1V

FB (Pin 1/Pin 1): Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Figure 1): RR V V OUT12 1 263 1= ⎛ ⎠⎟. ISN (Pin 2/Pin 2): Current Sense (–) Pin. The inverting input to the current sense amplifier. ISP (Pin 3/Pin 3): Current Sense (+) Pin. The noninverting input to the current sense amplifier. IADJ (Pin 4/Pin 4): Current Sense Adjust Pin. A DC voltage applied to this pin will reduce the current sense voltage. If this adjustment is not needed, tie this pin to ground. GND (Pin 5/Pin 5): Ground Pin. Tie this pin directly to local ground plane. NC (Pin 6/NA): No Connection for MS Package. SW (NA/Pin 6): Switch Pin for DD Package. Connect this pin to Pin 7. SW (Pin 7/Pin 7): Switch Pin. This is the collector of the internal NPN power switch. Minimize the metal trace area connected to this pin to minimize EMI. V IN (Pin 8/Pin 8): Input Supply Pin. Bypass this pin with a capacitor to ground as close to the device as possible. SHDN (Pin 9/Pin 9): Shutdown Pin. Tie this pin higher than 1V to turn on the LT1618; tie below 0.3V to turn it off. VC (Pin 10/Pin 10): Compensation Pin for Error Amplifier. Connect a series RC from this pin to ground. Typical values are 2kΩ and 10nF. Exposed Pad (NA/Pin 11): The Exposed Pad on the DD package is GND and must be soldered to the PCB GND for optimum thermal performance. TYPICAL PERFOR A CE CHARACTERISTICSUW TEMPERATURE (°C) –5 0 SWITCHING FREQUENCY (MHz) 125

1618 G07

1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 –2 5 2 5 5 0 100 VIN = 18V VIN = 1.6V FEEDBACK PIN VOLTAGE (V) SWITCHING FREQUENCY (MHz) 1.2

1618 G08

0 0.2 0.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.4 0.6 1.0 TJ = 25°C SHUTDOWN PIN VOLTAGE (V) SHDN PIN CURRENT (µA)

1618 G09

TJ = – 50°C TJ = 25°C TJ = 125°C Switching Frequency Frequency Foldback SHDN Pin Current (MS/DD)

Figure 1. LT1618 Block Diagram into either a constant-current or a constant-voltage mode. and regulate the output (constant-voltage mode).

be used at the output to minimize the output ripple voltage. Multilayer ceramic capacitors are an excellent choice. a good choice for many LT1618 designs. Table 1. Recommended Inductors Table 2. Recommended Ceramic Capacitor Manufacturers Table 3. Recommended Schottky Diodes

APPLICATIONS INFORMATIONWU UU Setting Output Voltage To set the output voltage, select the values of R1 and R2 (see Figure 1) according to the following equation. RR VOUT12 1 263 1= ⎛ ⎠⎟. For current source applications, use the FB pin for over- voltage protection. Pick R1 and R2 so that the output voltage will not go too high if the load is disconnected or if the load current drops below the preset value. Typically choose R1 and R2 so that the overvoltage value will be about 20% to 30% higher than the normal output voltage (when in constant-current mode). This prevents the volt- age loop from interfering with the current loop in current source applications. For battery charger applications, pick the values of R1 and R2 to give the desired end of charge voltage. Selecting R SENSE/Current Sense Adjustment Use the following formula to choose the correct current sense resistor value (for constant current operation). RSENSE = 50mV/IMAX For designs needing an adjustable current level, the IADJ pin is provided. With the I ADJ pin tied to ground, the nominal current sense voltage is 50mV (appearing be- tween the ISP and ISN pins). Applying a positive DC voltage to the I ADJ pin will decrease the current sense voltage according to the following formula: V VV ISENSE IADJ= 1 263 0 8 .– ( . ) For example, if 1V is applied to the I ADJ pin, the current sense voltage will be reduced to about 18mV. This adjustability allows the regulated current to be reduced without changing the current sense resistor (e.g. to adjust brightness in an LED driver or to reduce the charge current in a battery charger). If the I ADJ pin is taken above 1.6V, the output of the error amplifier (the VC pin) will be pulled down and the LT1618 will stop switching. A pulse width modulated (PWM) signal can also be used to adjust the current sense voltage; simply add an RC filterto convert the PWM signal into a DC voltage for the I ADJ pin. If the I ADJ pin is not used, it should be tied to ground. Do not leave the pin floating. For applications needing only a simple one-step current sense adjustment, the circuit in Figure 2 works well. If a large value resistor (≥2MΩ) is placed between the I ADJ pin and ground, the current sense voltage will reduce to about 25mV, providing a 50% reduction in current. Do not leave the I ADJ pin open. This method gives a well-regulated current value in both states, and is controlled by a logic signal without the need for a variable PWM or DC control signal. When the NMOS transistor is on, the current sense voltage will be 50mV, when it is off, the current sense voltage will be reduced to 25mV. Figure 2 LT1618 IADJ 2MFULL CURRENT

1618 F02

Considerations When Sensing Input Current In addition to regulating the DC output current for current- source applications, the constant-current loop of the LT1618 can also be used to provide an accurate input current limit. Boost converters cannot provide output short-circuit protection, but the surge turn-on current can be drastically reduced using the LT1618’s current sense at the input. SEPICs, however, have an output that is DC- isolated from the input, so an input current limit not only helps soft-start the output but also provides excellent short-circuit protection.

APPLICATIONS INFORMATIONWU UU Figure 3 LOAD VOUT SWITCH NODE 1618 • F03 VIN HIGH FREQUENCY CIRCULATING PATH When sensing input current, the sense resistor should be placed in front of the inductor (between the decoupling capacitor and the inductor) as shown in the circuits in the Typical Applications section. This will regulate the average inductor current and maintain a consistent inductor ripple current, which will, in turn, maintain a well regulated input current. Do not place the sense resistor between the input source and the input decoupling capacitor, as this may allow the inductor ripple current to vary widely (even though the average input current and the average inductor current will still be regulated). Since the inductor current is a triangular waveform (not a DC waveform like the output current) some tweaking of the compensation values (R C and CC on the VC pin) may be required to ensure a clean inductor ripple current while the constant-current loop is in effect. For these applications, the constant- current loop response can usually be improved by reduc- ing the R C value, or by adding a capacitor (with a value of approximately C C/10) in parallel with the R C and C C compensation network. Frequency Compensation The LT1618 has an external compensation pin (VC), which allows the loop response to be optimized for each applica- tion. An external resistor and capacitor (or sometimes just a capacitor) are placed at the V C pin to provide a pole and a zero (or just a pole) to ensure proper loop compensation. Numerous other poles and zeroes are present in the closed loop transfer function of a switching regulator, so the V C pin pole and zero are positioned to provide the best loop response. A thorough analysis of the switching regulator control loop is not within the scope of this data sheet, and will not be presented here, but values of 2kΩ and 10nF will be a good choice for many designs. For those wishing to optimize the compensation, use the 2k Ω and 10nF as a starting point. For LED backlight applications where a pulse-width modulation (PWM) signal is used to drive the I ADJ pin, the resistor is usually not included in the compensation network. This helps to provide additional filtering of the PWM signal at the output of the error amplifier (the V C pin). Switch Node Considerations To maximize efficiency, switch rise and fall times are made as short as possible. To prevent radiation and high fre- quency resonance problems, proper layout of the high frequency switching path is essential. Keep the output switch (SW pin), diode and output capacitor as close together as possible. Minimize the length and area of all traces connected to the switch pin, and always use a ground plane under the switching regulator to minimize interplane coupling. The high speed switching current path is shown in Figure 3. The signal path including the switch, output diode and output capacitor contains nano- second rise and fall times and should be kept as short as possible.

LOAD CURRENT (mA) EFFICIENCY (%) 50 100 150 200

1618 TA02b

4.5W Direct Broadcast Satellite (DBS) Power Supply with Short-Circuit Protection Efficiency LHCPRHCP 3.3V SHDN IADJ VC VIN SWISN ISP FB LT1618 100k 10k 24.9k VIN 12V 4.7µF CC 33nF 3.3µF 3.3µF

1618 TA02a

33µH 2.2µH 33µH GND 51 04 C1: TAIYO YUDEN EMK316BJ475 (408) 573-4150 C2: TAIYO YUDEN TMK316BJ105 (408) 573-4150 C3, C4: TAIYO YUDEN TMK325BJ335 (408) 573-4150 D1: ON SEMICONDUCTOR MBRM140 (800) 282-9855 L1, L2: SUMIDA CR54-330 (847) 956-0666 L3: SUMIDA CR43-2R2 (847) 956-0666 0.068Ω RC 1µF MMBT3904 FMMT717 ZETEX MURS110 13.5V/18.5V 22kHz NETWORK TUNING 10k ADD 5V

1.6V TO 3V 10kHz TO 50kHz PWM BRIGHTNESS ADJUST 4.7µF CC 0.1µF 1µF 1618 • TA03 2.49ΩD1 4.7µH 20mA 51 0 5.1k 0.1µF C1: TAIYO YUDEN JMK212BJ475 (408) 573-4150 C2: TAIYO YUDEN EMK316BJ105 (408) 573-4150 D1: ON SEMICONDUCTOR MBR0520 (800) 282-9855 L1: SUMIDA CLQ4D10-4R7 (847) 956-0666 SHDN IADJ GND VC VIN SW ISN ISP FB LT1618 332k D2 124k VIN 1.8V TO 3V 1µF 100nF C2 1µF 1618 • TA12 0.15ΩD1 10µH 350mA 51 0 C1, C2: TAIYO YUDEN JMK107BJ105KA D1: ON SEMICONDUCTOR MBR0520 D2: LUMILEDS LXHL-BW02 L1: SUMIDA CR43-100

2.7V TO 5V 10kHz TO 50kHz PWM BRIGHTNESS ADJUST 4.7µF CC 0.1µF 1µF 1618 • TA04 2.49ΩD1 10µH 20mA 51 0 4R3 5.1k 0.1µF C1: TAIYO YUDEN JMK212BJ475 (408) 573-4150 C2: TAIYO YUDEN TMK316BJ105 (408) 573-4150 D1: ON SEMICONDUCTOR MBR0530 (800) 282-9855 L1: SUMIDA CLQ4D10-100 (847) 956-0666 White LED Driver for 20 LEDs SHDN IADJ GND VC VIN SW ISN ISP FB LT1618 R1 121k VIN 2.7V TO 5V 10kHz TO 50kHz PWM BRIGHTNESS ADJUST 4.7µF CC 0.1µF 1µF 1618 • TA05 0.619ΩD1 10µH 80mA 51 0 5.1k 0.1µF 51Ω 51Ω 51Ω 51Ω C1: TAIYO YUDEN JMK212BJ475 (408) 573-4150 C2: TAIYO YUDEN TMK316BJ105 (408) 573-4150 D1: ON SEMICONDUCTOR MBR0530 (800) 282-9855 L1: SUMIDA CR43-100 (847) 956-0666

USB SEPIC During Start-Up USB SEPIC Start-Up with Output Shorted LOAD CURRENT (mA) EFFICIENCY (%) 350

1618 F09b

1618 TA10

1618 TA11

4.7µF 10nF 10µF 1618 • TA09a 10µH 10µH GND 51 04 0.1Ω 13k 20k VOUT 0.47µFIIN C1: TAIYO YUDEN JMK212BJ475 (408) 573-4150 C2: TAIYO YUDEN JMK316BJ106 (408) 573-4150 C3: TAIYO YUDEN EMK212BJ474 (408) 573-4150 D1: ON SEMICONDUCTOR MBR0520 (800) 282-9855 L1: SUMIDA CR43-100 (847) 956-0666 OFF ON 3.3V 100mA 500mA 3.3V

12V Boost Converter with 500mA Input Current Limit 12V Boost Converter Start-Up with Input Current Limit (VIN = 1.8V, ILOAD = 40mA) 12V Boost Converter Start-Up without Input Current Limit (VIN = 1.8V, ILOAD = 40mA) L0AD CURRENT (mA) EFFICIENCY (%) 120 140

1618 TA06b

VIN = 5V VIN = 3.3VSHDN IADJ VC VIN SWISN ISP FB LT1618 909k 107k VIN 1.8V TO 5V 4.7µF 10nF 4.7µF 1618 • TA06a 10µH GND 51 04 0.1Ω VOUT 12V C1: TAIYO YUDEN JMK212BJ475 (408) 573-4150 C2: TAIYO YUDEN EMK316BJ475 (408) 573-4150 D1: ON SEMICONDUCTOR MBR0520 (800) 282-9855 L1: SUMIDA CR43-100 (847) 956-0666 IL1 50µs/DIV

1618 TA07

50µs/DIV

1618 TA08

10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) 3.00 ±0.10 (4 SIDES) NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2). CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT 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 0.38 ± 0.10 BOTTOM VIEW—EXPOSED PAD 1.65 ± 0.10 (2 SIDES) 0.75 ±0.05 R = 0.115 TYP 2.38 ±0.10 (2 SIDES) 106 PIN 1 TOP MARK (SEE NOTE 6)

0.200 REF

0.00 – 0.05 (DD10) DFN 1103 0.25 ± 0.05 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 1.65 ±0.05 (2 SIDES)2.15 ±0.05 0.50 BSC 0.675 ±0.05 3.50 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05

0.50 BSC

(Reference LTC DWG # 05-08-1661) MSOP (MS) 0603 0.53 ± 0.152 (.021 ± .006) SEATING PLANE 0.18 (.007) 1.10 (.043) MAX 0.17 – 0.27 (.007 – .011) TYP 0.127 ± 0.076 (.005 ± .003) 0.86 (.034) REF 0.50 (.0197) BSC 12 3 45 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 0.254 (.010) 0° – 6° TYP DETAIL “A” DETAIL “A” GAUGE PLANE 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.889 ± 0.127 (.035 ± .005) RECOMMENDED SOLDER PAD LAYOUT 0.305 ± 0.038 (.0120 ± .0015) TYP 0.50 (.0197) BSC 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORA TION 2001 LT/TP 0504 1K REV A • PRINTED IN USA TYPICAL APPLICATIONSU Buck Mode Luxeon LED Driver SHDN IADJ VC VIN SWISN ISP FB LT1618 VIN 16V 4.7µF 2.2nF 220pF

1618 TA14

47µH GND 51 04 C1: TAIYO YUDEN TMK325BJ475MN D1: PHILIPS PMEG2010 D2: LUMILEDS DS45 L1: TOKO D104C 10k 0.07Ω Li-Ion Buck-Boost Mode Luxeon LED Driver SHDN IADJ VC VIN SWISP ISN FB LT1618 100k 10k VIN 3.2V TO 5V 4.7µF 10nF 4.7µF

1618 TA13

3.3µH GND 51 04 C1: TAIYO YUDEN JMK212BJ475KG C2: TAIYO YUDEN EMK316BJ475ML D1: ON SEMICONDUCTOR MBRM120 D2: LUMILEDS DS25 L1: NEC PLC-07453R3 0.15Ω PART NUMBER DESCRIPTION COMMENTS LT1613 550mA (I SW), 1.4MHz, High Efficiency Step-Up DC/DC Converter V IN: 0.9V to 10V, VOUT(MAX) = 34V, IQ = 3mA, ISD < 1µA, ThinSOT TM Package LT1615/LT1615-1 300mA/80mA (I SW), Constant Off-Time, High Efficiency Step-Up V IN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD < 1µA, DC/DC Converter ThinSOT Package DC/DC Converter I SD < 1µA, ThinSOT Package LT1932 Constant Current, 1.2MHz, High Efficiency White LED V IN: 1V to 10V, VOUT(MAX) = 34V, IQ = 1.2mA, ISD < 1µA, Boost Regulator ThinSOT Package LT1944/LT1944-1 Dual Output 350mA/100mA (I SW), Constant Off-Time, V IN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD < 1µA, (Dual) High Efficiency Step-Up DC/DC Converter MS Package LT1945 (Dual) Dual Output, Pos/Neg, 350mA (I SW), Constant Off-Time, V IN: 1.2V to 15V, VOUT(MAX) = ±34V, IQ = 20µA, ISD < 1µA, High Efficiency Step-Up DC/DC Converter MS Package LT1961 1.5A (I SW), 1.25MHz, High Efficiency Step-Up DC/DC Converter V IN: 3V to 25V, VOUT(MAX) = 35V, IQ = 0.9mA, ISD < 6µA, LTC3401/LTC3402 1A/2A (I SW), 3MHz, Synchronous Step-Up DC/DC Converter V IN: 0.5V to 5V, VOUT(MAX) = 6V, IQ = 38µA, ISD < 1µA, LT3461/LT3461A 0.3A (I SW), 1.3MHz/3MHz, High Efficiency Step-Up DC/DC V IN: 2.5V to 16V, VOUT(MAX) = 38V, IQ = 2.8mA, ISD < 1µA, Converter with Integrated Schottky SC70 and ThinSOT Packages LT3463/LT3463A 250mA (I SW), Boost/Inverter Dual, Micropower DC/DC Converter V IN: 2.4V to 15V, VOUT(MAX) = ±40V, IQ = 40µA, ISD < 1µA, with Integrated Schottky Diodes DFN Package LT3464 0.08A (I SW), High Efficiency Step-Up DC/DC Converter with V IN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25µA, ISD < 1µA, Integrated Schottky, Output Disconnect ThinSOT Package LT3465/LT3465A Constant Current, 1.2MHz/2.7MHz, High Efficiency White LED V IN: 2.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1µA, Boost Regulator with Integrated Schottky Diode ThinSOT Package Converter with Integrated Soft-Start ThinSOT Package ThinSOT is a trademark of Linear Technology Corporation. RELATED PARTS