ZHCSEU9C March   2016  – June 2018 LMZ34202

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化应用
      2.      效率与输出电流间的关系
  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 Switching Characteristics
    7. 6.7 Typical Characteristics
    8. 6.8 Typical Characteristics (Thermal Derating)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Adjusting the Output Voltage
      2. 7.3.2  Switching Frequency (RT)
      3. 7.3.3  Recommended Operating Range
      4. 7.3.4  Synchronization (CLK)
      5. 7.3.5  Output Capacitor Selection
      6. 7.3.6  VERSA-COMP Pin Configurations
      7. 7.3.7  Input Capacitor Selection
      8. 7.3.8  Output On/Off Inhibit (INH/UVLO)
      9. 7.3.9  Under Voltage Lockout (UVLO)
      10. 7.3.10 Remote Sense
      11. 7.3.11 VBSEL
      12. 7.3.12 Soft-Start (SS/TR)
      13. 7.3.13 Power Good (PWRGD) and Pull-up (PWRGD_PU)
      14. 7.3.14 Overcurrent Protection
      15. 7.3.15 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Light Load Operation
      3. 7.4.3 Shutdown Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Minimum External Component Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Output Voltage Set-Point
          3. 8.2.1.2.3 RT and RTSEL
          4. 8.2.1.2.4 VERSA-COMP
          5. 8.2.1.2.5 VBSEL
          6. 8.2.1.2.6 Input Capacitors
          7. 8.2.1.2.7 Output Capacitors
        3. 8.2.1.3 Application Curves
      2. 8.2.2 INH Control Application
        1. 8.2.2.1 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Switching Frequency
        2. 8.2.3.2 Power Good
        3. 8.2.3.3 Inhibit Control
        4. 8.2.3.4 VERSA-COMP
        5. 8.2.3.5 VBSEL
        6. 8.2.3.6 Soft-Start Capacitors
        7. 8.2.3.7 Input Capacitors
        8. 8.2.3.8 Output Capacitors
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 EMI
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 开发支持
        1. 11.1.1.1 使用 WEBENCH® 工具创建定制设计
      2. 11.1.2 第三方产品免责声明
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 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

6.5 Electrical Characteristics

Over –40°C to +105°C free-air temperature, PVIN = 24 V, VOUT = 5 V, IOUT = IOUT max, ƒsw = 500 kHz,
CIN1 = 1 × 10-µF, 100-V 1210 ceramic, CIN2 = 1 × 100-µF 100-V electrolytic bulk, and COUT = 3 × 47-µF, 16-V 1210 ceramic (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT VOLTAGE (PVIN)
PVIN Input voltage range Over IOUT range 4.5(1) 42 V
UVLO PVIN undervoltage lockout PVIN increasing 3.2 3.8 V
PVIN decreasing 2.8 V
OUTPUT VOLTAGE
VOUT(ADJ) Output voltage adjust range Over IOUT range 2.5 7.5 V
VOUT Set-point voltage tolerance TA = 25°C, IOUT = 200 mA ±0.7 ±1.5(2) %
Temperature variation -40°C ≤ TA ≤ 105°C, IOUT = 0 A ±0.9 %
Line regulation TA = 25°C, Over PVIN range, IOUT = 300 mA ±0.1 %
Load regulation TA = 25°C, IOUT = 300 mA to IOUT max ±0.3 %
Total output voltage variation Includes set-point, line, load, and temperature ±2 %
VOUT ripple Output voltage ripple 20-MHz Bandwidth 10 mV/pp
OUTPUT CURRENT
IOUT Output current TA = 105°C, natural convection 0 1.5 A
IOUT Output current TA = 105°C, 200LFM 0 2 A
IOUT Output current TA = 95°C, natural convection 0 2 A
ILIM Overcurrent threshold 2.5 A
PERFORMANCE
η Efficiency PVIN = 12 V
IOUT = 1 A		 VOUT = 7.5 V; ƒSW = 400 kHz 95 %
VOUT = 5 V; ƒSW = 200 kHz 93 %
VOUT = 5 V; ƒSW = 500 kHz 92 %
VOUT = 3.3 V; ƒSW= 200 kHz 90 %
VOUT = 2.5 V; ƒSW = 200 kHz 87 %
PVIN = 24 V
IOUT = 1 A		 VOUT = 7.5 V; ƒSW = 400 kHz 92 %
VOUT = 5 V; ƒSW= 250 kHz 90 %
VOUT = 5 V; ƒSW= 500 kHz 88 %
VOUT = 3.3 V; ƒSW = 250 kHz 86 %
VOUT = 2.5 V; ƒSW = 250 kHz 81 %
Transient response IOUT = 50% load step
1 A/µs slew rate		 Recovery time 100 µs
Over/Undershoot 2 %
SLOW START
TSS Internal slow start time SS/TR pin open 4.1 ms
INHIBIT
VINH (high) Inhibit control Precision inhibit level 2.00 2.1 2.42 V
VINH (low) Inhibit turn-off hysteresis -0.294 V
II (shutdown) Input shutdown supply current INH/UVLO pin conected to AGND 2.4 6.2(3) µA
POWER GOOD (PWRGD)
VPWRGD PWRGD thresholds VOUT rising Good 95 %
Fault 110 %
VOUT falling Fault 90 %
Good 105 %
THERMAL SHUTDOWN
TSHUTDOWN Thermal shutdown Shutdown Temperature 160 °C
Hysteresis 10 °C
INPUT/OUTPUT CAPACITANCE
CIN External input capacitance ceramic 10(4) µF
non-ceramic 100 µF
COUT External output capacitance Ceramic 64(5) See(6) µF
Non-ceramic 100 See(6) µF
ceramic + non-ceramic See(6) µF
Equivalent series resistance (ESR) 20 mΩ
(1) The minimum PVIN is 4.5 V or (VOUT / 0.75), whichever is greater. For VOUT = 3.3 V, the minimum PVIN is 4.75 V when IOUT > 1.5 A.
(2) The stated limit of the set-point voltage tolerance includes the tolerance of both the internal voltage reference and the internal adjustment resistor. The overall output voltage tolerance will be affected by the tolerance of the external RSET resistor.
(3) Guaranteed by design. Not production tested.
(4) The specified minimum ceramic input capacitance represents the standard capacitance value. The actual effective capacitance after considering the effects of DC bias and temperature variation should be ≥ 4.7 µF.
(5) The amount of required output capacitance varies depending on the output voltage (see Output Capacitor Selection). The minimum required output capacitance must be comprised of ceramic capacitance. The amount of required ceramic capacitance represents the standard capacitance value. Locate the capacitance close to the device. Adding additional ceramic or non-ceramic capacitance close to the load improves the response of the regulator to load transients.
(6) The maximum allowable output capacitance varies depending on the output voltage (see Output Capacitor Selection).