ZHCSKF0A October   2019  – June 2022 LMR33610

PRODUCTION DATA  

  1. 特性
  2. 应用
  3. 说明
  4. Revision History
  5. Device Comparison
  6. Pin Configuration and Functions
  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
    6. 7.6 Timing Characteristics
    7. 7.7 System Characteristics
    8. 7.8 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power-Good Flag Output
      2. 8.3.2 Enable and Start-up
      3. 8.3.3 Current Limit and Short Circuit
      4. 8.3.4 Undervoltage Lockout and Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Auto Mode
      2. 8.4.2 Dropout
      3. 8.4.3 Minimum Switch On Time
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Custom Design With WEBENCH® Tools
        2. 9.2.2.2  Choosing the Switching Frequency
        3. 9.2.2.3  Setting the Output Voltage
        4. 9.2.2.4  Inductor Selection
        5. 9.2.2.5  Output Capacitor Selection
        6. 9.2.2.6  Input Capacitor Selection
        7. 9.2.2.7  CBOOT
        8. 9.2.2.8  VCC
        9. 9.2.2.9  CFF Selection
        10. 9.2.2.10 External UVLO
        11. 9.2.2.11 Maximum Ambient Temperature
      3. 9.2.3 Application Curves
    3. 9.3 What to Do and What Not to Do
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
        1. 12.1.1.1 Custom Design With WEBENCH® Tools
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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Electrical Characteristics

Limits apply over the recommended operating junction temperature (TJ) range of –40°C to +125°C, unless otherwise stated. Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated, the following conditions apply: VIN = 12 V, VEN = 4 V.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
SUPPLY VOLTAGE
VINMinimum operating input voltage3.8V
IQNon-switching input current; measured at VIN pin (2)VFB = 1.2 V2434µA
ISDShutdown quiescent current; measured at VIN pinEN = 0510µA
ENABLE
VEN-VCC-HEN input level required to turn on internal LDORising threshold1V
VEN-VCC-LEN input level required to turn off internal LDOFalling threshold0.3V
VEN-HEN input level required to start switchingRising threshold1.21.2311.26V
VEN-HYSHysteresis below VEN-HHysteresis below VEN-H; falling100mV
ILKG-ENEnable input leakage currentVEN = 3.3 V0.2nA
INTERNAL SUPPLIES
VCCInternal LDO output voltage appearing at the VCC pin6 V ≤ VIN ≤ 36 V4.7555.25V
VBOOT-UVLOBootstrap voltage undervoltage lock-out threshold(3)2.2V
VOLTAGE REFERENCE (FB PIN)
VFBFeedback voltage0.98511.015V
IFBCurrent into FB pinFB = 1 V0.250nA
CURRENT LIMITS(4)
ISCHigh-side current limitLMR336102.93.44A
ILIMITLow-side current limitLMR336101.952.352.9A
IPEAK-MINMinimum peak inductor currentLMR336100.6A
IZCZero current detector threshold0.01A
SOFT START
tSSInternal soft-start time2.946ms
POWER GOOD (PG PIN)
VPG-HIGH-UPPower-good upper threshold - rising% of FB voltage105%107%110%
VPG-HIGH-DNPower-good upper threshold – falling% of FB voltage103%105%108%
VPG-LOW-UPPower-good lower threshold – rising% of FB voltage92%94%97%
VPG-LOW-DNPower-good lower threshold – falling% of FB voltage90%92%95%
tPGPower-good glitch filter delay(1)60170µs
RPGPower-good flag RDSONVIN = 12 V, VEN = 4 V76150
VEN = 0 V3560
VIN-PGMinimum input voltage for proper PG function50-µA, EN = 0 V2V
VPGPG logic low output50-µA, EN = 0 V, VIN = 2V0.2V
OSCILLATOR
ƒSWSwitching frequency"A" version340400460kHz
ƒSWSwitching frequency"B" version1.21.41.6MHz
ƒSWSwitching frequency"C" version, DDA package1.82.12.4MHz
MOSFETS
RDS-ON-HSHigh-side MOSFET ON-resistanceDDA package95160
RDS-ON-LSLow-side MOSFET ON-resistanceDDA package66110
See Section 8.3.1 for details.
This is the current used by the device open loop. It does not represent the total input current of the system when in regulation.
When the voltage across the CBOOT capacitor falls below this voltage, the low-side MOSFET is turned on to recharge CBOOT.
The current limit values in this table are tested, open loop, in production. They can differ from those found in a closed loop application.