SNVSB29C October   2018  – June 2021

PRODUCTION DATA

1. Features
2. Applications
3. Description
4. Revision History
5. Description (continued)
6. Pin Configuration and Functions
7. Specifications
8. Detailed Description
1. 8.1 Overview
2. 8.2 Functional Block Diagram
3. 8.3 Feature Description
4. 8.4 Device Functional Modes
9. Application and Implementation
1. 9.1 Application Information
1. 9.1.1 Power Train Components
2. 9.1.2 Error Amplifier and Compensation
2. 9.2 Typical Applications
1. 9.2.1 Design 1 – High Efficiency, Dual-Output Buck Regulator for Automotive Applications
2. 9.2.2 Design 2 – Two-Phase, Single-Output Buck Regulator for Automotive ADAS Applications
10. 10Power Supply Recommendations
11. 11Layout
1. 11.1 Layout Guidelines
2. 11.2 Layout Example
12. 12Device and Documentation Support
1. 12.1 Device Support
2. 12.2 Documentation Support
1. 12.2.1 Related Documentation
4. 12.4 Support Resources
6. 12.6 Electrostatic Discharge Caution
7. 12.7 Glossary
13. 13Mechanical, Packaging, and Orderable Information

#### Package Options

• RWG|40
##### 9.2.1.2.5 Output Capacitors
1. Use Equation 38 to estimate the output capacitance required to manage the output voltage overshoot during a load-off transient (from full load to no load) assuming a load transient deviation specification of 1.5% (50 mV for a 3.3-V output).
Equation 38.
2. Noting the voltage coefficient of ceramic capacitors where the effective capacitance decreases significantly with applied voltage, select four 47-µF, 6.3-V, X7R, 1210 ceramic output capacitors for each channel. Generally, when sufficient capacitance is used to satisfy the load-off transient response requirement, the voltage undershoot during a no-load to full-load transient is also satisfactory.
3. Use Equation 39 to estimate the peak-peak output voltage ripple of channel 1 at nominal input voltage.
Equation 39.

where

• RESR is the effective equivalent series resistance (ESR) of the output capacitors.
• 130 µF is the total effective (derated) ceramic output capacitance at 3.3 V.
4. Use Equation 40 to calculate the output capacitor RMS ripple current using and verify that the ripple current is within the capacitor ripple current rating.
Equation 40.