ZHCSM49 April 2021 AMC3336-Q1
PRODUCTION DATA
The AMC3336-Q1 is powered from the low-side power supply (VDD) with a nominal value of 3.3 V (or 5 V). TI recommends a low ESR decoupling capacitor of 1 nF (C8 in Figure 9-1) placed as close as possible to the VDD pin, followed by a 1-μF capacitor (C9) to filter this power-supply path.
The low-side of the DC/DC converter is decoupled with a low-ESR, 100-nF capacitor (C4) positioned close to the device between the DCDC_IN and DCDC_GND pins. Use a 1-μF capacitor (C2) to decouple the high-side in addition to a low-ESR, 1-nF capacitor (C3) placed as close as possible to the device and connected to the DCDC_OUT and DCDC_HGND pins.
For the high-side LDO, use low-ESR capacitors of 1-nF (C6), placed as close as possible to the AMC3336-Q1, followed by a 100-nF decoupling capacitor (C5).
The ground reference for the high-side (HGND) is derived from the terminal of the sense resistor that is connected to the negative input (INN) of the device. IIN and HGND can be shorted together directly at the device pins. The high-side DC/DC ground terminal (DCDC_HGND) is also shorted to HGND directly at the device pins.
Capacitors must provide adequate effective capacitance under the applicable DC bias conditions they experience in the application. MLCC capacitors typically exhibit only a fraction of their nominal capacitance under real-world conditions and this factor must be taken into consideration when selecting these capacitors. This problem is especially acute in low-profile capacitors, in which the dielectric field strength is higher than in taller components. Reputable capacitor manufacturers provide capacitance versus DC bias curves that greatly simplify component selection.
Table 9-1 lists components suitable for use with the AMC3336-Q1. This list is not exhaustive. Other components may exist that are equally suitable (or better), however these listed components have been validated during the development of the AMC3336-Q1.
| DESCRIPTION | PART NUMBER | MANUFACTURER | SIZE (EIA, L x W) | |
|---|---|---|---|---|
| VDD | ||||
| C8 | 1 nF ± 10%, X7R, 50 V | 12065C102KAT2A | AVX | 1206, 3.2 mm x 1.6 mm |
| C9 | 1 μF ± 10%, X7R, 25 V | 12063C105KAT2A | AVX | 1206, 3.2 mm x 1.6 mm |
| DC/DC CONVERTER | ||||
| C4 | 100 nF ± 10%, X7R, 50 V | C0603C104K5RACAUTO | Kemet | 0603, 1.6 mm x 0.8 mm |
| C3 | 1 nF ± 10%, X7R, 50 V | C0603C102K5RACTU | Kemet | 0603, 1.6 mm x 0.8 mm |
| C2 | 1 μF ± 10%, X7R, 25 V | CGA3E1X7R1E105K080AC | TDK | 0603, 1.6 mm x 0.8 mm |
| HLDO | ||||
| C1 | 100 nF ± 10%, X7R, 50 V | C0603C104K5RACAUTO | Kemet | 0603, 1.6 mm x 0.8 mm |
| C5 | 100 nF ± 5%, NP0, 50 V | C3216NP01H104J160AA | TDK | 1206, 3.2 mm x 1.6 mm |
| C6 | 1 nF ± 10%, X7R, 50 V | 12065C102KAT2A | AVX | 1206, 3.2 mm x 1.6 mm |