SBVS342A February   2019  – March 2019

PRODUCTION DATA.

1. Features
2. Applications
3. Description
4. Revision History
5. Pin Configuration and Functions
6. Specifications
7. Detailed Description
1. 7.1 Overview
2. 7.2 Functional Block Diagram
3. 7.3 Feature Description
4. 7.4 Device Functional Modes
1. 7.4.1 Power-Good
8. Application and Implementation
1. 8.1 Application Information
2. 8.2 Typical Applications
1. 8.2.1 TPS7A16A-Q1 Circuit as an Adjustable Regulator
1. 8.2.1.1 Design Requirements
2. 8.2.1.2 Detailed Design Procedure
3. 8.2.1.3 Application Curves
2. 8.2.2 Automotive Applications
9. Power Supply Recommendations
10. 10Layout
1. 10.1 Layout Guidelines
2. 10.2 Layout Examples
11. 11Device and Documentation Support
12. 12Mechanical, Packaging, and Orderable Information

• DGN|8
• DGN|8

#### 8.2.1.2.1.1 Resistor Selection

Use resistors in the order of MΩ to keep the overall quiescent current of the system as low as possible (by making the current used by the resistor divider negligible compared to the quiescent current of the device).

If greater voltage accuracy is required, take into account the voltage offset contributions as a result of feedback current and use 0.1% tolerance resistors.

Table 2 shows the resistor combination to achieve an output for a few of the most common rails using commercially available 0.1% tolerance resistors to maximize nominal voltage accuracy, while adhering to the formula shown in Equation 1.

### Table 2. Selected Resistor Combinations

VOUT R1 R2 VOUT/(R1 + R2) « IQ NOMINAL ACCURACY
1.194 V 0 Ω 0 µA ±2%
1.8 V 1.18 MΩ 2.32 MΩ 514 nA ±(2% + 0.14%)
2..5 V 1.5 MΩ 1.37 MΩ 871 nA ±(2% + 0.16%)
3.3 V 2 MΩ 1.13 MΩ 1056 nA ±(2% + 0.35%)
5 V 3.4 MΩ 1.07 MΩ 1115 nA ±(2% + 0.39%)
10 V 7.87 MΩ 1.07 MΩ 1115 nA ±(2% + 0.42%)
12 V 14.3 MΩ 1.58 MΩ 755 nA ±(2% + 0.18%)
15 V 42.2 MΩ 3.65 MΩ 327 nA ±(2% + 0.19%)
18 V 16.2 MΩ 1.15 MΩ 1038 nA ±(2% + 0.26%)

Close attention must be paid to board contamination when using high-value resistors; board contaminants can significantly impact voltage accuracy. If board cleaning measures cannot be ensured, consider using a fixed-voltage version of the TPS7A16A-Q1 or using resistors in the order of hundreds or tens of kΩ.