ZHCSQT5 July 2022 TPS7A57
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Output Voltage Setting and Regulation
- 7.3.2 Low-Noise, Ultra-High Power-Supply Rejection Ratio (PSRR)
- 7.3.3 Programmable Soft-Start (NR/SS Pin)
- 7.3.4 Precision Enable and UVLO
- 7.3.5 Charge Pump Enable and BIAS Rail
- 7.3.6 Power-Good Pin (PG Pin)
- 7.3.7 Active Discharge
- 7.3.8 Thermal Shutdown Protection (TSD)
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1
Application Information
- 8.1.1 Precision Enable (External UVLO)
- 8.1.2 Undervoltage Lockout (UVLO) Operation
- 8.1.3 Dropout Voltage (VDO)
- 8.1.4 Input and Output Capacitor Requirements (CIN and COUT)
- 8.1.5 Recommended Capacitor Types
- 8.1.6 Soft-Start, Noise Reduction (NR/SS Pin), and Power-Good (PG Pin)
- 8.1.7 Optimizing Noise and PSRR
- 8.1.8 Adjustable Operation
- 8.1.9 Load Transient Response
- 8.1.10 Current Limit and Foldback Behavior
- 8.1.11 Charge Pump Operation
- 8.1.12 Sequencing
- 8.1.13 Power-Good Functionality
- 8.1.14 Output Impedance
- 8.1.15 Paralleling for Higher Output Current and Lower Noise
- 8.1.16 Current Mode Margining
- 8.1.17 Voltage Mode Margining
- 8.1.18 Power Dissipation (PD)
- 8.1.19 Estimating Junction Temperature
- 8.1.20 TPS7A57EVM-081 Thermal Analysis
- 8.2 Typical Application
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 8.1
Application Information
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RTE|16
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RTE|16
訂購信息
8.1.8 Adjustable Operation
As shown in Figure 8-8, the output voltage of the device can be set using a single external resistor (RREF).
Figure 8-8 Typical
CircuitUse Equation 5 to calculate the RREF value needed for the desirable output voltage.
Equation 17. VOUT =
IREF(NOM) × RREF
Table 8-4 shows the recommended RREF resistor values to achieve several common rails using a standard 1%-tolerance resistor.
Table 8-4 Recommended RREF
Values
| TARGETED OUTPUT VOLTAGE (V) | RREF (kΩ)(1) | CALCULATED OUTPUT VOLTAGE (V) |
|---|---|---|
| 0.5 | 10.0 | 0.500 |
| 0.6 | 12.1 | 0.605 |
| 0.7 | 14.0 | 0.700 |
| 0.8 | 16.2 | 0.810 |
| 0.9 | 18.2 | 0.910 |
| 1.0 | 20.0 | 1.000 |
| 1.2 | 24.3 | 1.215 |
| 1.5 | 30.1 | 1.505 |
| 2.5 | 49.9 | 2.495 |
| 3.0 | 60.4 | 3.020 |
| 3.3 | 66.5 | 3.325 |
| 3.6 | 71.5 | 3.575 |
| 4.7 | 95.3 | 4.765 |
| 5.0 | 100.0 | 5.000 |
(1) 1% resistors.