ZHCSS97H september   1998  – june 2023 LM2676

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 说明（续）
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics – 3.3-V Version
    6. 7.6  Electrical Characteristics – 5-V Version
    7. 7.7  Electrical Characteristics – 12-V Version
    8. 7.8  Electrical Characteristics – Adjustable Voltage Version
    9. 7.9  Electrical Characteristics – All Output Voltage Versions
    10. 7.10 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Adjustable Output Voltage
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Active Mode
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Fixed Output Voltage Typical Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Custom Design with WEBENCH® Tools
          2. 9.2.1.2.2 Inductor Selection (L1)
          3. 9.2.1.2.3 Output Capacitor Selection (COUT)
          4. 9.2.1.2.4 Catch Diode Selection (D1)
          5. 9.2.1.2.5 Input Capacitor (CIN)
          6. 9.2.1.2.6 Boost Capacitor (CB)
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Adjustable Output Voltage Typical Application
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Programming Output Voltage
          2. 9.2.2.2.2 Inductor Selection (L1)
          3. 9.2.2.2.3 Output Capacitor Selection (COUT)
          4. 9.2.2.2.4 Catch Diode Selection (D1)
          5. 9.2.2.2.5 Input Capacitor (CIN)
          6. 9.2.2.2.6 Boost Capacitor (CB)
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Typical Application for All Output Voltage Versions
        1. 9.2.3.1 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 WSON Package Devices
      2. 9.4.2 Layout Examples
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 Custom Design with WEBENCH® Tools
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 接收文档更新通知
    4. 10.4 支持资源
    5. 10.5 Trademarks
    6. 10.6 静电放电警告
    7. 10.7 术语表
  12. 11Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息
9.2.2.2.3 Output Capacitor Selection (COUT)
  1. Select an output capacitor from the capacitor code selection guide in Table 9-8. Using the inductance value found in the inductor selection guide, step 1, locate the appropriate capacitor code corresponding to the desired output voltage. Use the appropriate row of the capacitor code selection guide, in Table 9-8. For this example, use the 15-V to 20-V row. The capacitor code corresponding to an inductance of 100 μH is C20.
  2. Select an appropriate capacitor value and voltage rating, using the capacitor code, from the output capacitor selection in Table 9-9. There are two solid tantalum (surface-mount) capacitor manufacturers and four electrolytic (through-hole) capacitor manufacturers to choose from. TI recommends that both the manufacturers and the manufacturer's series that are listed in the table be used. From the output capacitor selection in Table 9-9, choose a capacitor value (and voltage rating) that intersects the capacitor code(s) selected in section A, C20.

    The capacitance and voltage rating values corresponding to the capacitor code C20 are the following:

    • Surface mount
      • 33-μF, 25-V Sprague 594D series
      • 33-μF, 25-V AVX TPS series
    • Through hole
      • 33-μF, 25-V Sanyo OS-CON SC series
      • 120-μF, 35-V Sanyo MV-GX series
      • 120-μF, 35-V Nichicon PL series
      • 20-μF, 35-V Panasonic HFQ series

Other manufacturers or other types of capacitors can also be used, provided the capacitor specifications (especially the 100-kHz ESR) closely match the characteristics of the capacitors listed in the output capacitor table. Refer to the capacitor manufacturers' data sheet for this information.

Table 9-8 Capacitor Code Selection Guide
CASE
STYLE(1)		OUTPUT
VOLTAGE (V)		INDUCTANCE (μH)
22334768100150220
SM and TH1.21–2.5————C1C2C3
SM and TH2.5–3.75———C1C2C3C3
SM and TH3.75–5——C4C5C6C6C6
SM and TH5–6.25—C4C7C6C6C6C6
SM and TH6.25–7.5C8C4C7C6C6C6C6
SM and TH7.5–10C9C10C11C12C13C13C13
SM and TH10–12.5C14C11C12C12C13C13C13
SM and TH12.5–15C15C16C17C17C17C17C17
SM and TH15–20C18C19C20C20C20C20C20
SM and TH20–30C21C22C22C22C22C22C22
TH30–37C23C24C24C25C25C25C25
(1) SM = Surface mount and TH = Through hole
Table 9-9 Output Capacitor Selection Table
OUTPUT CAPACITOR
CAP.
REF.
DESG.
#		SURFACE MOUNTTHROUGH HOLE
SPRAGUE
594D SERIES
(μF/V)		AVX TPS
SERIES
(μF/V)		SANYO OS-CON
SA SERIES
(μF/V)		SANYO MV-GX
SERIES
(μF/V)		NICHICON
PL SERIES
(μF/V)		PANASONIC
HFQ SERIES
(μF/V)
C1120/6.3100/10100/10220/35220/35220/35
C2120/6.3100/10100/10150/35150/35150/35
C3120/6.3100/10100/35120/35120/35120/35
C468/10100/1068/10220/35220/35220/35
C5100/16100/10100/10150/35150/35150/35
C6100/16100/10100/10120/35120/35120/35
C768/10100/1068/10150/35150/35150/35
C8100/16100/10100/10330/35330/35330/35
C9100/16100/16100/16330/35330/35330/35
C10100/16100/1668/16220/35220/35220/35
C11100/16100/1668/16150/35150/35150/35
C12100/16100/1668/16120/35120/35120/35
C13100/16100/16100/16120/35120/35120/35
C14100/16100/16100/16220/35220/35220/35
C1547/2068/2047/20220/35220/35220/35
C1647/2068/2047/20150/35150/35150/35
C1747/2068/2047/20120/35120/35120/35
C1868/25(2×) 33/2547/(1)220/35220/35220/35
C1933/2533/2533/25(1)150/35150/35150/35
C2033/2533/2533/25(1)120/35120/35120/35
C2133/35(2×) 22/25 See(2)150/35150/35150/35
C2233/3522/35See(2)120/35120/35120/35
C23See(2)See(2)See(2)220/50100/50120/50
C24See(2)See(2)See(2)150/50100/50120/50
C25See(2)See(2)See(2)150/5082/5082/50
(1) The SC series of Os-Con capacitors (others are SA series)
(2) The voltage ratings of the surface mount tantalum chip and Os-Con capacitors are too low to work at these voltages.