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  • TPS785-Q1 具有高精度和使能功能的汽车类 1A、高 PSRR 低压差稳压器

    • ZHCSN73B January   2021  – January 2022 TPS785-Q1

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  • TPS785-Q1 具有高精度和使能功能的汽车类 1A、高 PSRR 低压差稳压器
  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and 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
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Foldback Current Limit
      2. 7.3.2 Output Enable
      3. 7.3.3 Active Discharge
      4. 7.3.4 Undervoltage Lockout (UVLO) Operation
      5. 7.3.5 Dropout Voltage
      6. 7.3.6 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Device Functional Mode Comparison
      2. 7.4.2 Normal Operation
      3. 7.4.3 Dropout Operation
      4. 7.4.4 Disabled
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Recommended Capacitor Types
      2. 8.1.2 Input and Output Capacitor Requirements
      3. 8.1.3 Adjustable Device Feedback Resistors
      4. 8.1.4 Load Transient Response
      5. 8.1.5 Exiting Dropout
      6. 8.1.6 Dropout Voltage
      7. 8.1.7 Reverse Current
      8. 8.1.8 Feed-Forward Capacitor (CFF)
      9. 8.1.9 Power Dissipation (PD)
        1. 8.1.9.1 Estimating Junction Temperature
        2. 8.1.9.2 Recommended Area for Continuous Operation
        3. 8.1.9.3 Power Dissipation versus Ambient Temperature
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Additional Layout Considerations
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 接收文档更新通知
    4. 11.4 支持资源
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 术语表
  12. 12Mechanical, Packaging, and Orderable Information
  13. 重要声明
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DATA SHEET

TPS785-Q1 具有高精度和使能功能的汽车类 1A、高 PSRR 低压差稳压器

本资源的原文使用英文撰写。 为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。 为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 特性

  • 符合面向汽车应用的 AEC-Q100 标准：
    • 温度等级 1：–40°C 至 +125°C，TA
  • 器件结温：–40°C 至 +150°C，TJ
  • 输入电压范围：1.7V 至 6.0V
  • 可提供以下输出电压：
    • 可调节选项：1.2V 至 5.5V
    • 固定选项：0.65V 至 5.0V
  • 输出精度：典型值为 0.5%，最大值为 1.7%
  • 低 IQ：25μA（典型值）
  • 超低压降：
    • 1A 电流时为 315mV（最大值）(3.3VOUT)
  • 内部软启动时间为 550μs，可降低浪涌电流
  • 有源输出放电
  • 封装：
    • 3mm × 3mm 可湿性侧面 VSON (8) 封装
    • 5 引脚 TO-252，RθJA = 31.6°C/W

2 应用

  • 汽车音响主机
  • 混合仪表组
  • 远程信息处理控制单元
  • 中距离和短距离雷达
  • 直流/直流转换器

3 说明

TPS785-Q1 超低压降稳压器 (LDO) 是一款小型低静态电流 LDO，可提供 1A 电流，具有出色的线路和负载瞬态性能。

凭借低输出噪声和出色的 PSRR 性能，此器件适用于功耗敏感型模拟负载。TPS785-Q1 具有 1.7V 至 6.0V 的输入电压范围和 1.2V 至 5.5V 的可调节输出电压范围，是一款灵活的后置稳压器件。它还提供 0.65V 至 5.0V 的固定输出电压，为常用电压轨供电。

TPS785-Q1 具有折返电流限制，可在过流条件下降低功率耗散。EN 端输入有助于满足该系统的电源时序要求。内部软启动通过控制启动过程来降低浪涌电流，从而减小使用的输入电容。

TPS785-Q1 提供了有源下拉电路，当被禁用时可以使输出负载快速放电。

器件信息(1)
器件型号 封装 封装尺寸（标称值）
TPS785-Q1 可湿性侧面 VSON (8) 3.00mm × 3.00mm
TO-252 (5) 6.10mm × 6.60mm
(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附录。

GUID-20201209-CA0I-X7Z1-DDMJ-00CJWBCXSJ0W-low.gif典型应用电路

4 Revision History

Changes from May 7, 2021 to January 11, 2022 (from Revision A (April 2021) to Revision B (January 2022))

  • 向文档添加了 DRB 封装 B 版本 (VSON)Go
  • Added B version of DRB package (VSON) to the Pin Configuration and Functions sectionGo
  • Reworded the VIN conditions to have more clarity on what 1.65 V or whichever is greater applies to.Go
  • Added line item for 1.2 V ≤ VOUT < 1.5 V dropout voltage in the DRB package. Go
  • Changed Device Nomenclature tableGo

Changes from Revision * (January 2021) to Revision A (April 2021)

  • 将文档状态从预告信息更改为量产数据Go

5 Pin Configuration and Functions

GUID-C32BD759-2557-4108-948E-A38CE01CB709-low.gifFigure 5-1 DRB Package (Fixed),8-Pin VSON(Top View)
Figure 5-3 DRB Package (Fixed) B Version,8-Pin VSON(Top View)
Figure 5-5 KVU Package (Fixed),5-Pin TO-252(Top View)
GUID-1504D833-D6BA-4384-BCBE-3825F640C4DE-low.gifFigure 5-2 DRB Package (Adjustable),8-Pin VSON(Top View)
Figure 5-4 DRB Package (Adjustable) B Version,8-Pin VSON(Top View)
Figure 5-6 KVU Package (Adjustable),5-Pin TO-252(Top View)
Table 5-1 Pin Functions
PIN I/O DESCRIPTION
NAME DRB (Fixed) DRB (Adjustable) DRB (Fixed) B Version DRB (Adjustable) B Version KVU (Fixed) KVU (Adjustable)
EN 7 7 6 6 1 1 Input Enable pin. Driving this pin to logic high enables the device; driving this pin to logic low disables the device. Do not float this pin. If not used, connect EN to IN.
FB — 2 — 2 — 5 Input Feedback pin. Input to the control-loop error amplifier. This pin is used to set the output voltage of the device with the use of external resistors. Do not float this pin. For adjustable-voltage version devices only.
GND 5 5 5 5 3 3 — Ground pin. This pin must be connected to ground on the board.
IN 8 8 8 8 2 2 Input Input pin. For best performance, place the nominal recommended value or larger ceramic capacitor from IN to GND; see the Recommended Operating Conditions table. Place the input capacitor as close to the input of the device as possible.
NC 2, 3, 4, 6 3, 4, 6 2, 3, 4, 7 3, 4, 7 5 — — No connect pin. This pin is not internally connected. Connect to ground for best thermal performance or leave floating.
OUT 1 1 1 1 4 4 Output A 0.47-µF or greater effective capacitance is required from OUT to ground for stability. For best transient response, use a 1-µF or larger ceramic capacitor from OUT to ground. Place the output capacitor as close to output of the device as possible; see the Recommended Operating Conditions table.
Thermal Pad Pad Pad Pad Pad Pad Pad — The thermal pad is electrically connected to the GND pin. Connect the thermal pad to a large-area GND plane for improved thermal performance.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Voltage Supply, VIN –0.3 6.5 V
Enable, VEN –0.3 6.5 V
Output, VOUT –0.3 VIN + 0.3(2) V
Feedback, VFB –0.3 2 V
Current Output, IOUT Internally limited
Temperature Operating junction, TJ –40 150 °C
Storage, Tstg –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The absolute maximum rating is VIN + 0.3 V or 6.5 V, whichever is smaller.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per AEC Q100-002(1) ±2000 V
Charged-device model (CDM), per AEC Q100-011 ±500
(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
VIN Input voltage 1.7 6.0 V
VOUT Output voltage Adjustable output 1.2 5.5 V
Fixed output 0.65 5.0
CIN Input capacitor 0.1 1 µF
COUT Output capacitor 1(1) 200 µF
CFF Feed-forward capacitor(2) 0 10 100 nF
IOUT Output current 0 1 A
COUT,ESR Output capacitor ESR 0.001 1 Ω
VEN Enable voltage 0 6 V
FEN Enable toggle frequency 10 kHz
TJ Junction temperature –40 150 °C
(1) The minimum effective capacitance is 0.47 µF.
(2) Feed-forward capacitor is optional and not required for stability. 

 
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