ZHCS528H January   2007  – August 2017 LM25575

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  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 Diagram
    3. 7.3 Feature Description
      1. 7.3.1 High Voltage Start-Up Regulator
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown and Stand-by Mode
      2. 7.4.2 Error Amplifier and PWM Comparator
      3. 7.4.3 Ramp Generator
      4. 7.4.4 Maximum Duty Cycle and Input Drop-out Voltage
      5. 7.4.5 Current Limit
      6. 7.4.6 Soft-Start
      7. 7.4.7 Boost Pin
      8. 7.4.8 Thermal Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1  External Components
      2. 8.1.2  R3 (RT)
      3. 8.1.3  L1
      4. 8.1.4  C3 (CRAMP)
      5. 8.1.5  C9, C10
      6. 8.1.6  D1
      7. 8.1.7  C1, C2
      8. 8.1.8  C8
      9. 8.1.9  C7
      10. 8.1.10 C4
      11. 8.1.11 R5, R6
      12. 8.1.12 R1, R2, C12
      13. 8.1.13 R7, C11
      14. 8.1.14 R4, C5, C6
      15. 8.1.15 BIas Power Dissipation Reduction
    2. 8.2 Typical Application
      1. 8.2.1 Typical Schematic for High Frequency (1 MHz) Application
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
  9. 9 Layout
    1. 9.1 Layout Guidelines
      1. 9.1.1 PCB Layout and Thermal Considerations
    2. 9.2 Layout Example
  10. 10器件和文档支持
    1. 10.1 器件支持
      1. 10.1.1 开发支持
        1. 10.1.1.1 使用 WEBENCH® 工具创建定制设计
    2. 10.2 接收文档更新通知
    3. 10.3 社区资源
    4. 10.4 商标
    5. 10.5 静电放电警告
    6. 10.6 Glossary
  11. 11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

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
VIN to GND 45 V
BST to GND 60 V
PRE to GND 45 V
SW to GND (Steady State) –1.5 V
BST to VCC 45 V
SD, VCC to GND 14 V
BST to SW 14 V
OUT to GND Limited Vin V
SYNC, SS, FB, RAMP to GND 7 V
Storage temperature, 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) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2 kV
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions(1)

MIN MAX UNIT
VIN 6 42 V
TJ Operation junction temperature –40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) LM25575 UNIT
PWP (HTSSOP)
16 PINS
RθJA Junction-to-ambient thermal resistance 14 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 50 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

6.5 Electrical Characteristics

at TJ = 25°C, and VIN = 24 V, RT = 32.4 kΩ (unless otherwise noted).(2)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
STARTUP REGULATOR
VccReg Vcc Regulator Output TJ = –40°C to +125°C 6.85 7.15 7.45 V
Vcc LDO Mode turn-off 9 V
Vcc Current Limit Vcc = 0 V 25 mA
VCC SUPPLY
Vcc UVLO Threshold (Vcc increasing) TJ = –40°C to +125°C 5.03 5.35 5.67 V
Vcc Undervoltage Hysteresis 0.35 V
Bias Current (Iin) FB = 1.3 V TJ = –40°C to +125°C 3.7 4.5 mA
Shutdown Current (Iin) SD = 0 V TJ = –40°C to +125°C 48 70 µA
SHUTDOWN THRESHOLDS
Shutdown Threshold (SD Increasing) TJ = –40°C to +125°C 0.47 0.7 0.9 V
Shutdown Hysteresis 0.1 V
Standby Threshold (Standby Increasing) TJ = –40°C to +125°C 1.17 1.225 1.28 V
Standby Hysteresis 0.1 V
SD Pull-up Current Source 5 µA
SWITCH CHARACTERSICS
Buck Switch Rds(on) TJ = –40°C to +125°C 330 660 mΩ
BOOST UVLO 4 V
BOOST UVLO Hysteresis 0.56 V
Pre-charge Switch Rds(on) 70 Ω
Pre-charge Switch on-time 250 ns
CURRENT LIMIT
Cycle by Cycle Current Limit RAMP = 0 V TJ = –40°C to +125°C 1.8 2.1 2.5 A
Cycle by Cycle Current Limit Delay RAMP = 2.5 V 85 ns
SOFT-START
SS Current Source TJ = –40°C to +125°C 7 10 14 µA
OSCILLATOR
Frequency1 TJ = –40°C to +125°C 180 200 220 kHz
Frequency2 RT = 11 kΩ TJ = –40°C to +125°C 425 485 545 kHz
SYNC Source Impedance 11 kΩ
SYNC Sink Impedance 110 Ω
SYNC Threshold (falling) 1.3 V
SYNC Frequency RT = 11 kΩ TJ = –40°C to +125°C 550 kHz
SYNC Pulse Width Minimum TJ = –40°C to +125°C 15 ns
RAMP GENERATOR
Ramp Current 1 Vin = 36 V,
Vout=10 V		 TJ = –40°C to +125°C 272 310 368 µA
Ramp Current 2 Vin = 10 V,
Vout=10 V		 TJ = –40°C to +125°C 36 50 64 µA
PWM COMPARATOR
Forced Off-time TJ = –40°C to +125°C 416 500 575 ns
Min On-time 80 ns
COMP to PWM Comparator Offset 0.7 V
ERROR AMPLIFIER
Feedback Voltage Vfb = COMP TJ = –40°C to +125°C 1.207 1.225 1.243 V
FB Bias Current 17 nA
DC Gain 70 dB
COMP Sink / Source Current TJ = –40°C to +125°C 3 mA
Unity Gain Bandwidth 3 MHz
DIODE SENSE RESISTANCE
DSENSE 83 mΩ
THERMAL SHUTDOWN
Tsd Thermal Shutdown Threshold 165 °C
Thermal Shutdown Hysteresis 25 °C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics.
(2) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are assured through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instruments' Average Outgoing Quality Level (AOQL).

6.6 Typical Characteristics

LM25575 20212120.gif Figure 1. Oscillator Frequency vs RT
LM25575 20212123.gif
VIN = 12V
Figure 3. VCC vs ICC
LM25575 20212125.gif
AVCL = 101
Figure 5. Error Amplifier Gain and Phase
LM25575 20212122.gif Figure 2. Soft Start Current vs Temperature
LM25575 20212124.gif
A.
RL = 7 kΩ
Figure 4. VCC vs VIN
LM25575 20212126.gif
A.
Figure 6. Demoboard Efficiency vs IOUT and VIN
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