ZHCSLK4S July   2004  – May 2025 LP2985 , LP2985A

PRODUCTION DATA  

  1.   1
  2. 特性
  3. 应用
  4. 说明
  5. Pin Configuration and Functions
  6. Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagrams
    3. 6.3 Feature Description
      1. 6.3.1 Output Enable
      2. 6.3.2 Dropout Voltage
      3. 6.3.3 Current Limit
      4. 6.3.4 Undervoltage Lockout (UVLO)
      5. 6.3.5 Output Pulldown
      6. 6.3.6 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Device Functional Mode Comparison
      2. 6.4.2 Normal Operation
      3. 6.4.3 Dropout Operation
      4. 6.4.4 Disabled
  8. Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Recommended Capacitor Types
        1. 7.1.1.1 Recommended Capacitors (Legacy Chip)
        2. 7.1.1.2 Recommended Capacitors (New Chip)
      2. 7.1.2 Input and Output Capacitor Requirements
        1. 7.1.2.1 Input Capacitor Requirements
        2. 7.1.2.2 Output Capacitor Requirements
      3. 7.1.3 Noise Bypass Capacitor (CBYPASS)
      4. 7.1.4 Reverse Current
      5. 7.1.5 Power Dissipation (PD)
      6. 7.1.6 Estimating Junction Temperature
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 ON/OFF Operation
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Device Nomenclature
    2. 8.2 接收文档更新通知
    3. 8.3 支持资源
    4. 8.4 Trademarks
    5. 8.5 静电放电警告
    6. 8.6 术语表
  10. Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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订购信息

Typical Characteristics

at operating temperature TJ = 25°C, VIN = VOUT(NOM) + 1.0 V or 2.5 V (whichever is greater), IOUT = 1 mA, ON/OFF pin tied to VIN, CIN = 1.0 µF, and COUT = 4.7 µF (unless otherwise noted)

LP2985 LP2985A Output Voltage vs Temperature for Legacy Chip
 
Figure 5-1 Output Voltage vs Temperature for Legacy Chip
LP2985 LP2985A Output Voltage vs Temperature for New Chip
VIN = 4.3 V, VOUT = 3.3 V (for new chip)
Figure 5-3 Output Voltage vs Temperature for New Chip
LP2985 LP2985A Dropout Voltage vs
                        Temperature for New Chip
 
Figure 5-5 Dropout Voltage vs Temperature for New Chip
LP2985 LP2985A Output Regulation vs Load
                        Current for New Chip
 
Figure 5-7 Output Regulation vs Load Current for New Chip
LP2985 LP2985A Short-Circuit Current vs Time for Legacy Chip
 
Figure 5-9 Short-Circuit Current vs Time for Legacy Chip
LP2985 LP2985A Short-Circuit Current vs Time for Legacy Chip
 
Figure 5-11 Short-Circuit Current vs Time for Legacy Chip
LP2985 LP2985A Short-Circuit Current vs Output Voltage for Legacy Chip
 
Figure 5-13 Short-Circuit Current vs Output Voltage for Legacy Chip
LP2985 LP2985A Short-Circuit Current vs
                        Temperature for New Chip
 
Figure 5-15 Short-Circuit Current vs Temperature for New Chip
LP2985 LP2985A Ground Pin Current vs Load
                        Current for New Chip
 
Figure 5-17 Ground Pin Current vs Load Current for New Chip
LP2985 LP2985A Ripple Rejection vs
                        Frequency for New Chip
VIN = 5 V, VOUT = 3.3 V, COUT = 10 μF, CBYP = 0 nF
Figure 5-19 Ripple Rejection vs Frequency for New Chip
LP2985 LP2985A Ripple Rejection vs
                        Frequency for New Chip
VIN = 3.7 V, VOUT = 3.3 V, COUT = 10 μF, CBYP = 0 nF
Figure 5-21 Ripple Rejection vs Frequency for New Chip
LP2985 LP2985A Ripple Rejection vs
                        Frequency for New Chip
 
Figure 5-23 Ripple Rejection vs Frequency for New Chip
LP2985 LP2985A Ripple Rejection vs
                        Frequency for New Chip
 
Figure 5-25 Ripple Rejection vs Frequency for New Chip
LP2985 LP2985A Output Impedance vs Frequency for Legacy Chip
 
Figure 5-27 Output Impedance vs Frequency for Legacy Chip
LP2985 LP2985A Output Noise Density vs
                        Frequency for New Chip
 
Figure 5-29 Output Noise Density vs Frequency for New Chip
LP2985 LP2985A Output Noise Density vs
                        Frequency for New Chip
 
Figure 5-31 Output Noise Density vs Frequency for New Chip
LP2985 LP2985A Input Current vs Input
                        Voltage for New Chip
 
Figure 5-33 Input Current vs Input Voltage for New Chip
LP2985 LP2985A Ground-Pin Current vs Temperature for New Chip
 
Figure 5-35 Ground-Pin Current vs Temperature for New Chip
LP2985 LP2985A 4.7-μF Stable ESR Range for Output Voltage ≤ 2.3 V for Legacy Chip
 
Figure 5-37 4.7-μF Stable ESR Range for Output Voltage ≤ 2.3 V for Legacy Chip
LP2985 LP2985A Output Voltage vs Temperature for Legacy Chip
 
Figure 5-2 Output Voltage vs Temperature for Legacy Chip
LP2985 LP2985A Dropout Voltage vs Temperature for Legacy Chip
 
Figure 5-4 Dropout Voltage vs Temperature for Legacy Chip
LP2985 LP2985A Dropout Voltage vs Load
                        Current for New Chip
 
Figure 5-6 Dropout Voltage vs Load Current for New Chip
LP2985 LP2985A Output Regulation vs Input
                        Voltage for New Chip
 
Figure 5-8 Output Regulation vs Input Voltage for New Chip
LP2985 LP2985A Short-Circuit Current vs
                        Time for New Chip
VIN = 6 V
Figure 5-10 Short-Circuit Current vs Time for New Chip
LP2985 LP2985A Short-Circuit Current vs
                        Time for New Chip
 
Figure 5-12 Short-Circuit Current vs Time for New Chip
LP2985 LP2985A Short-Circuit Current vs
                        Output Voltage for New Chip
 
Figure 5-14 Short-Circuit Current vs Output Voltage for New Chip
LP2985 LP2985A Ground Pin Current vs Load Current for Legacy Chip
 
Figure 5-16 Ground Pin Current vs Load Current for Legacy Chip
LP2985 LP2985A Ripple Rejection vs Frequency for Legacy Chip
 
Figure 5-18 Ripple Rejection vs Frequency for Legacy Chip
LP2985 LP2985A Ripple Rejection vs Frequency for Legacy Chip
 
Figure 5-20 Ripple Rejection vs Frequency for Legacy Chip
LP2985 LP2985A Ripple Rejection vs Frequency for Legacy Chip
 
Figure 5-22 Ripple Rejection vs Frequency for Legacy Chip
LP2985 LP2985A Ripple Rejection vs Frequency for Legacy Chip
 
Figure 5-24 Ripple Rejection vs Frequency for Legacy Chip
LP2985 LP2985A Output Impedance vs Frequency for Legacy Chip
 
Figure 5-26 Output Impedance vs Frequency for Legacy Chip
LP2985 LP2985A Output Noise Density vs Frequency for Legacy Chip
 
Figure 5-28 Output Noise Density vs Frequency for Legacy Chip
LP2985 LP2985A Output Noise Density vs Frequency for Legacy Chip
 
Figure 5-30 Output Noise Density vs Frequency for Legacy Chip
LP2985 LP2985A Input
                        Current vs Input Voltage for Legacy Chip
 
Figure 5-32 Input Current vs Input Voltage for Legacy Chip
LP2985 LP2985A Ground-Pin Current vs Temperature for Legacy Chip
 
Figure 5-34 Ground-Pin Current vs Temperature for Legacy Chip
LP2985 LP2985A 2.2-μF Stable ESR Range for Output Voltage ≤ 2.3 V for Legacy Chip
 
Figure 5-36 2.2-μF Stable ESR Range for Output Voltage ≤ 2.3 V for Legacy Chip
LP2985 LP2985A 2.2-μF, 3.3-μF Stable ESR Range for Output Voltage ≥ 2.5 V for Legacy
                        Chip
 
Figure 5-38 2.2-μF, 3.3-μF Stable ESR Range for Output Voltage ≥ 2.5 V for Legacy Chip