Datasheet LTC3672B-2 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm × 2mm DFN |
| Páginas / Página | 12 / 9 — APPLICATIONS INFORMATION. Table 1. Recommended Inductors for the Buck … |
| Formato / tamaño de archivo | PDF / 161 Kb |
| Idioma del documento | Inglés |
APPLICATIONS INFORMATION. Table 1. Recommended Inductors for the Buck Regulator. INDUCTOR TYPE. MAX IDC. MAX DCR. SIZE IN mm
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LTC3672B-2
APPLICATIONS INFORMATION Table 1. Recommended Inductors for the Buck Regulator INDUCTOR TYPE L MAX IDC MAX DCR SIZE IN mm MANUFACTURER (μH) (A) (
Ω
) (L
×
W
×
H)
DE2818C 4.7 1.25 0.072 3 × 2.8 × 1.8 Toko 3.3 1.45 0.053 3 × 2.8 × 1.8 www.toko.com D312C 4.7 0.79 0.24 3.6 × 3.6 × 1.2 3.3 0.9 0.2 3.6 × 3.6 × 1.2 DE2812C 4.7 1.15 0.13* 3 × 2.8 × 1.2 3.3 1.37 0.105* 3 × 2.8 × 1.2 CDRH3D16 4.7 0.9 0.11 4 × 4 × 1.8 Sumida 3.3 1.1 0.085 4 × 4 × 1.8 www.sumida.com CDRH2D11 4.7 0.5 0.17 3.2 × 3.2 × 1.2 3.3 0.6 0.123 3.2 × 3.2 × 1.2 CLS4D09 4.7 0.75 0.19 4.9 × 4.9 × 1 SD3118 4.7 1.3 0.162 3.1 × 3.1 × 1.8 Cooper 3.3 1.59 0.113 3.1 × 3.1 × 1.8 www.cooperet.com SD3112 4.7 0.8 0.246 3.1 × 3.1 × 1.2 3.3 0.97 0.165 3.1 × 3.1 × 1.2 SD12 4.7 1.29 0.117* 5.2 × 5.2 × 1.2 3.3 1.42 0.104* 5.2 × 5.2 × 1.2 SD10 4.7 1.08 0.153* 5.2 × 5.2 × 1 3.3 1.31 0.108* 5.2 × 5.2 × 1 LPS3015 4.7 1.1 0.2 3 × 3 × 1.5 Coil Craft 3.3 1.3 0.13 3 × 3 × 1.5 www.coilcraft.com * = Typical DCR
INPUT/OUTPUT CAPACITOR SELECTION
Consult with capacitor manufacturers for detailed infor- mation on their selection and specifi cations of ceramic Low ESR (equivalent series resistance) ceramic capacitors capacitors. Many manufacturers now offer very thin (<1mm should be used to bypass the following pins to ground: tall) ceramic capacitors ideal for use in height-restricted VIN, VIN1, the buck output, LDO1, and LDO2. Only X5R designs. Table 2 shows a list of several ceramic capacitor or X7R ceramic capacitors should be used because they manufacturers. retain their capacitance over wider voltage and temperature ranges than other ceramic types. A 10μF output capacitor
Table 2. Ceramic Capacitor Manufacturers
is suffi cient for the buck regulator output. For good tran- AVX www.avxcorp.com sient response and stability the output capacitor for the Murata www.murata.com buck regulator should retain at least 4μF of capacitance Taiyo Yuden www.t-yuden.com over operating temperature and bias voltage. The VIN pin Vishay Siliconix www.vishay.com should be bypassed with a 2.2μF capacitor. The LDO1 and TDK www.tdk.com LDO2 output pins should be bypassed with a 1μF capacitor or greater. VIN1 should be bypassed with a 1μF capacitor, which may be omitted if VIN1 is tied to the VIN pin. 3672b2fa 9
APPLICATIONS INFORMATION Table 1. Recommended Inductors for the Buck Regulator INDUCTOR TYPE L MAX IDC MAX DCR SIZE IN mm MANUFACTURER (μH) (A) (
Ω
) (L
×
W
×
H)
DE2818C 4.7 1.25 0.072 3 × 2.8 × 1.8 Toko 3.3 1.45 0.053 3 × 2.8 × 1.8 www.toko.com D312C 4.7 0.79 0.24 3.6 × 3.6 × 1.2 3.3 0.9 0.2 3.6 × 3.6 × 1.2 DE2812C 4.7 1.15 0.13* 3 × 2.8 × 1.2 3.3 1.37 0.105* 3 × 2.8 × 1.2 CDRH3D16 4.7 0.9 0.11 4 × 4 × 1.8 Sumida 3.3 1.1 0.085 4 × 4 × 1.8 www.sumida.com CDRH2D11 4.7 0.5 0.17 3.2 × 3.2 × 1.2 3.3 0.6 0.123 3.2 × 3.2 × 1.2 CLS4D09 4.7 0.75 0.19 4.9 × 4.9 × 1 SD3118 4.7 1.3 0.162 3.1 × 3.1 × 1.8 Cooper 3.3 1.59 0.113 3.1 × 3.1 × 1.8 www.cooperet.com SD3112 4.7 0.8 0.246 3.1 × 3.1 × 1.2 3.3 0.97 0.165 3.1 × 3.1 × 1.2 SD12 4.7 1.29 0.117* 5.2 × 5.2 × 1.2 3.3 1.42 0.104* 5.2 × 5.2 × 1.2 SD10 4.7 1.08 0.153* 5.2 × 5.2 × 1 3.3 1.31 0.108* 5.2 × 5.2 × 1 LPS3015 4.7 1.1 0.2 3 × 3 × 1.5 Coil Craft 3.3 1.3 0.13 3 × 3 × 1.5 www.coilcraft.com * = Typical DCR
INPUT/OUTPUT CAPACITOR SELECTION
Consult with capacitor manufacturers for detailed infor- mation on their selection and specifi cations of ceramic Low ESR (equivalent series resistance) ceramic capacitors capacitors. Many manufacturers now offer very thin (<1mm should be used to bypass the following pins to ground: tall) ceramic capacitors ideal for use in height-restricted VIN, VIN1, the buck output, LDO1, and LDO2. Only X5R designs. Table 2 shows a list of several ceramic capacitor or X7R ceramic capacitors should be used because they manufacturers. retain their capacitance over wider voltage and temperature ranges than other ceramic types. A 10μF output capacitor
Table 2. Ceramic Capacitor Manufacturers
is suffi cient for the buck regulator output. For good tran- AVX www.avxcorp.com sient response and stability the output capacitor for the Murata www.murata.com buck regulator should retain at least 4μF of capacitance Taiyo Yuden www.t-yuden.com over operating temperature and bias voltage. The VIN pin Vishay Siliconix www.vishay.com should be bypassed with a 2.2μF capacitor. The LDO1 and TDK www.tdk.com LDO2 output pins should be bypassed with a 1μF capacitor or greater. VIN1 should be bypassed with a 1μF capacitor, which may be omitted if VIN1 is tied to the VIN pin. 3672b2fa 9