Datasheet LT3495, LT3495B, LT3495-1, LT3495B-1 (Analog Devices) - 9

LT3495/LT3495B/ LT3495-1/LT3495B-1
APPLICATIONS INFORMATION Inductor Selection
input capacitor and a 1µF to 10µF output capacitor are Several inductors that work well with the LT3495/LT3495B sufficient for most applications. Always use a capacitor are listed in Table 2 and those for the LT3495-1/LT3495B-1 with a sufficient voltage rating. Many capacitors rated at are listed in Table 3. These tables are not complete, and 1µF to 10µF, particularly 0603 case sizes, have greatly there are many other manufacturers and devices that can reduced capacitance when bias voltages are applied. Be be used. Consult each manufacturer for more detailed sure to check actual capacitance at the desired output information and for their entire selection of related parts, voltage. Generally a 0805 or 1206 size capacitor will be as many different sizes and shapes are available. adequate. A 2.2µF capacitor placed on the CAP node is recommended to filter the inductor current while a 1µF to Inductors with a value of 3.3µH or higher are recommended 10µF capacitor placed on the VOUT node will give excellent for most LT3495 series designs. Inductors with low core transient response and stability. Table 4 shows a list of losses and small DCR (copper wire resistance) are good several capacitor manufacturers. Consult the manufac- choices for LT3495 series applications. For full output turers for more detailed information and for their entire power, the inductor should have a saturation current rating selection of related parts. higher than the peak inductor current. The peak inductor current can be calculated as:
Table 3. Recommended Inductors for LT3495-1/LT3495B-1 L DCR
V
PART (µH) (mΩ) SIZE (mm) VENDOR
I IN • 200 •10–9 amps PK =ILIMIT + L LPO4815-472MLC 4.7 150 4.8 × 4.8 × 1.5 Coilcraft LPO4815-682MLC 6.8 180 4.8 × 4.8 × 1.5 www.coilcraft.com where I LPO4815-103MLC 10 230 4.8 × 4.8 × 1.5 LIMIT is 0.65A and 0.35A for LT3495/LT3495B and LPS3008-472MLC 4.7 350 3.0 × 3.0 × 0.8 LT3495-1/LT3495B-1 respectively. L is the inductance LPS3008-682MLC 6.8 500 3.0 × 3.0 × 0.8 value in Henrys and V LPS3008-103MLC 10 650 3.0 × 3.0 × 0.8 IN is the input voltage to the boost circuit. LQH32CN4R7M53 4.7 150 3.2 × 2.5 × 1.6 Murata LQH32CN100K33 10 300 3.2 × 2.5 × 2.0 www.murata.com
Table 2. Recommended Inductors for LT3495/LT3495B
CDH28D09/S-6R2 6.2 369 3.3 × 3.0 × 1.0 Sumida www.sumida.com
L DCR PART (µH) (mΩ) SIZE (mm) VENDOR
744030004 4.7 290 3.5 × 3.3 × 1.0 Wurth Elektronik www.we-online.com LPS4018-103ML 10 200 4.4 × 4.4 × 1.7 Coilcraft MSS5131-103MLC 10 83 5.1 × 5.1 × 3.1 www.coilcraft.com LPS3015-472MLC 4.7 200 3.0 × 3.0 × 1.5 LPS3015-682MLC 6.8 300
Table 4. Recommended Ceramic Capacitor Manufacturers
3.0 × 3.0 × 1.5 LQH43CN4R7M03 4.7 150
MANUFACTURER PHONE WEBSITE
4.5 × 3.2 × 2.8 Murata www.murata.com Taiyo Yuden (408) 573-4150 www.t-yuden.com CR32-6R8 6.8 202 4.1 × 3.7 × 3.0 Sumida AVX (843) 448-9411 www.avxcorp.com www.sumida.com Murata (814) 237-1431 www.murata.com 744031004 4.7 105 3.8 × 3.8 × 1.7 Wurth Elektronik www.we-online.com Kemet (408) 986-0424 www.kemet.com TDK (847) 803-6100 www.tdk.com
Capacitor Selection Diode Selection
The small size and low ESR of ceramic capacitors makes Schottky diodes, with their low forward voltage drops and them suitable for most LT3495 series applications. X5R fast switching speeds, are recommended for use with the and X7R types are recommended because they retain LT3495 series. The Diodes Inc. B0540WS-7 is a very good their capacitance over wider voltage and temperature choice. This diode is rated to handle an average forward ranges than other types such as Y5V or Z5U. A 4.7µF current of 0.5A with 40V reverse breakdown. 3495b1b1fa 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Infomation Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts