ZHCSP87A December 2022 – September 2023 TPS25772-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Recommended Components
- 7.5 Thermal Information
- 7.6 Buck-Boost Regulator
- 7.7 CC Cable Detection Parameters
- 7.8 CC VCONN Parameters
- 7.9 CC PHY Parameters
- 7.10 Thermal Shutdown Characteristics
- 7.11 Oscillator Characteristics
- 7.12 ADC Characteristics
- 7.13 TVS Parameters
- 7.14 Input/Output (I/O) Characteristics
- 7.15 BC1.2 Characteristics
- 7.16 I2C Requirements and Characteristics
- 7.17 Typical Characteristics
- 8 Parameter Measurement Information
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Device Power Management and Supervisory Circuitry
- 9.3.2 TVSP Device Configuration and ESD Protection
- 9.3.3
Buck-Boost Regulator
- 9.3.3.1 Buck-Boost Regulator Operation
- 9.3.3.2 Switching Frequency, Frequency Dither, Phase-Shift and Synchronization
- 9.3.3.3 VIN Supply and VIN Over-Voltage Protection
- 9.3.3.4 Feedback Paths and Error Amplifiers
- 9.3.3.5 Transconductors and Compensation
- 9.3.3.6 Output Voltage DAC, Soft-Start and Cable Droop Compensation
- 9.3.3.7 VBUS Overvoltage Protection
- 9.3.3.8 VBUS Undervoltage Protection
- 9.3.3.9 Current Sense Resistor (RSNS) and Current Limit Operation
- 9.3.3.10 Buck-Boost Peak Current Limits
- 9.3.4 USB-PD Physical Layer
- 9.3.5 VCONN
- 9.3.6 Cable Plug and Orientation Detection
- 9.3.7 ADC
- 9.3.8 BC 1.2, Legacy and Fast Charging Modes (Px_DP, Px_DM)
- 9.3.9 USB2.0 Low-Speed Endpoint
- 9.3.10 Digital Interfaces
- 9.3.11 I2C Interface
- 9.3.12 Digital Core
- 9.3.13 NTC Input
- 9.3.14 Thermal Sensors and Thermal Shutdown
- 9.4 Device Functional Modes
- 10Application and Implementation
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
10.2.2.6 Output Capacitor
In the boost mode, the output capacitor conducts high ripple current. The output capacitor RMS ripple current is given by Equation 19 where the minimum VIN corresponds to the maximum capacitor current.
In this example the maximum output ripple RMS current is ICOUT(RMS) = 3.18 A. A 5-mΩ output capacitor ESR causes an output ripple voltage of 34 mV as given by:
A 140 µF output capacitor (COUT + CBUS) causes a capacitive ripple voltage of 26 mV as given by:
Typically a combination of ceramic and bulk capacitors is needed to provide low ESR and high ripple current capacity. The complete schematic in Typical Application section provides COUT and CBUS recommendations suitable for most applications.