ZHCSI13J October   2004  – November 2018 TPS75003

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用原理图
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
      1. 6.6.1 Buck Converter
      2. 6.6.2 LDO Converter
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Operation (Buck Controllers)
      2. 7.3.2  Enable (Buck Controllers)
      3. 7.3.3  UVLO (Buck Controllers)
      4. 7.3.4  Current Limit (Buck Controllers)
      5. 7.3.5  Short-Circuit Protection (Buck Controllers)
      6. 7.3.6  Soft-Start (Buck Controllers)
      7. 7.3.7  LDO Operation
      8. 7.3.8  Internal Current Limit (LDO)
      9. 7.3.9  Enable Pin (LDO)
      10. 7.3.10 Dropout Voltage (LDO)
      11. 7.3.11 Transient Response (LDO)
      12. 7.3.12 Thermal Protection (LDO)
      13. 7.3.13 Power Dissipation (LDO)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Input Capacitor CIN1, CIN2 Selection (Buck Controllers)
        2. 8.2.2.2  Inductor Value Selection (Buck Controllers)
        3. 8.2.2.3  External PMOS Transistor Selection (Buck Controllers)
        4. 8.2.2.4  Diode Selection (Buck Controllers)
        5. 8.2.2.5  Output Capacitor Selection (Buck Controllers)
        6. 8.2.2.6  Output Voltage Ripple Effect on VOUT (Buck Controllers)
        7. 8.2.2.7  Soft-Start Capacitor Selection (Buck Controllers)
        8. 8.2.2.8  Output Voltage Setting Selection (Buck Controllers)
        9. 8.2.2.9  Input Capacitor Selection (LDO)
        10. 8.2.2.10 Output Capacitor Selection (LDO)
        11. 8.2.2.11 Soft-Start Capacitor Selection (LDO)
        12. 8.2.2.12 Setting Output Voltage (LDO)
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 PCB Layout Considerations
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 第三方产品免责声明
      2. 11.1.2 开发支持
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    3. 11.3 接收文档更新通知
    4. 11.4 社区资源
    5. 11.5 商标
    6. 11.6 静电放电警告
    7. 11.7 术语表
  12. 12机械、封装和可订购信息

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

5 Pin Configuration and Functions

RHL Package
20-Pin VQFN
Top View
TPS75003 pin_rhl_bvs052.gif

Pin Functions

PIN TYPE DESCRIPTION
NAME NO.
AGND 18 GND Ground connection for LDO.
DGND 6, 15, PAD GND Ground connection for BUCK1 and BUCK2 converters. Pins 6 and 15 should be connected to the back side exposed pad by a short metal trace as shown in the PCB Layout Considerations section of this data sheet.
EN1 17 I Driving the enable pin (ENx) high turns on BUCK1 regulator. Driving this pin low puts it into shutdown mode, reducing operating current. The enable pin does not trigger on fast negative going transients.
EN2 4 I Same as EN1 but for BUCK2 controller.
EN3 3 I Same as EN1 but for LDO.
FB1 11 I (Analog) Feedback pin. Used to set the output voltage of BUCK1 regulator.
FB2 10 I (Analog) Same as FB1 but for BUCK2 controller.
FB3 2 I (Analog) Same as FB1 but for LDO.
IN1 13 I (Analog) Input supply to BUCK1.
IN2 8 I (Analog) Input supply to BUCK2.
IN3 20 I (Power) Input supply to LDO.
IS1 12 I (Analog) Current sense input for BUCK1 regulator. The voltage difference between this pin and IN1 is compared to an internal reference to set current limit. For a robust output start-up ramp, careful layout and bypassing are required. See the Application Information section for details.
IS2 9 I (Analog) Same as IS1 but compared to IN2 and used for BUCK2 controller.
OUT3 1 O (Power) Regulated LDO output. A small ceramic capacitor (≥ 2.2μF) is needed from this pin to ground to ensure stability.
SS1 16 I (Analog) Connecting a capacitor between this pin and ground increases start-up time of the BUCK1 regulator by slowing the ramp-up of current limit. This high-impedance pin is noise-sensitive; careful layout is important. See the Typical Characteristics, Application Information, and PCB Layout Considerations sections for details.
SS2 5 I (Analog) Same as SS1 but for BUCK2 regulator.
SS3 19 I (Analog) Connecting a capacitor from this pin to ground slows the start-up time of the LDO reference, thereby slowing output voltage ramp-up. See the Application Information section for details.
SW1 14 O (Analog) Gate drive pin for external BUCK1 P-channel MOSFET.
SW2 7 O (Analog) Same as SW1 but for BUCK2 controller.