SNAS660D June   2015  – May 2021 LM53600-Q1 , LM53601-Q1

PRODUCTION DATA  

  1. Features
  2. Applications
  3. Description
  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 System Characteristics
    7. 7.7 Timing Requirements
    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 Control Scheme
      2. 8.3.2 Soft-Start Function
      3. 8.3.3 Current Limit
      4. 8.3.4 Hiccup Mode
      5. 8.3.5 RESET Function
      6. 8.3.6 Forced PWM Operation
      7. 8.3.7 Auto Mode Operation and IQ_VIN
      8. 8.3.8 SYNC Operation
      9. 8.3.9 Spread Spectrum
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown
      2. 8.4.2 FPWM Operation
      3. 8.4.3 Auto Mode Operation
  9. Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Off-Battery 5-V, 1-A Output Automotive Converter with Spread Spectrum
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection
          2. 9.2.1.2.2 Output Capacitor Selection
          3. 9.2.1.2.3 Input Capacitor Selection
          4. 9.2.1.2.4 FB Voltage Divider for Adjustable Versions
          5. 9.2.1.2.5 RPU - RESET Pull Up Resistor
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Off-Battery 3.3 V, 1 A Output Automotive Converter with Spread Spectrum
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Design Procedure
        3. 9.2.2.3 Application Curves
    3. 9.3 Do's and Don't's
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Plane Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Electrical Characteristics

Limits apply to the recommended operating junction temperature range of –40°C to 150°C, unless otherwise noted. Minimum and maximum limits are ensured 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 = 13.5 V.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
VFBInitial output voltage accuracyVin= 3.8 V to 36 V Tj=25°C, Open Loop–1%1%
Vin= 3.8 V to 36 V, Open Loop–1.5%1.5%
IQOperating quiescent current; measured at VIN pinVin= 13.5 V, Not switching Vbias= 5 V6.5µA
Vin= 13.5 V, Not switching Vbias= 5 V, Tj= 85°C16
IBBias current into BIAS pin for adjustable versions and FB pin for fixed versionsVin= 13.5 V, Not switching Vbias= 5 V, Mode = 0 V4680
ISDShutdown quiescent current; measured at VIN pinEN = 0, VIN = 13.5 V Tj = 25°C1.8µA
EN = 0, VIN = 13.5 V Tj = 85°C3
Vin_UVLOMinimum input voltage to operateRising3.23.63.75V
Vin_UVLO _hystMinimum input voltage hysteresisHysteresis0.20.30.35V
Vreset_OVRESET upper threshold voltageRising, % of Vout105%106.5%110%
Vreset_UVRESET lower threshold voltageFalling, % Vout92%94%97%
Vreset_guardMagnitude of RESET lower threshold difference from steady state output voltageSteady state output voltage and RESET threshold read at the same TJ, and VIN3.9%
Vreset_hystRESET hysteresis as a percent of output voltage set point1%
Vreset_validMinimum input voltage for proper RESET function50 µA pull-up to RESET pin, EN = 0 V, Tj = 25°C1.5V
VOLLow level RESET function output voltage50 µA pull-up to RESET pin, Vin = 1.5 V, EN = 0 V, Tj = 25°C0.4V
0.5mA pull-up to RESET pin, Vin = 13.5 V, EN = 0 V0.4
1mA pull-up to RESET pin, Vin = 13.5 V, EN = 3.3 V0.4
FswSwitching frequencyVIN = 13.5 V, Center frequency with spread spectrum, PWM operation1.892.12.4MHz
VIN = 13.5 V, Without spread spectrum, PWM operation1.892.12.4
VIN = 36 V, 3.3-V fixed output device and adjustable devices regardless of output voltage1.0
VIN = 36 V, 5-V fixed output device1.5
FSYNCSync frequency rangeOutput setting + 1 V < VIN < 18 V1.92.12.3MHz
DSYNCSync input duty cycle rangeHigh state input < 5.5 V and > 2.3 V25%75%
VSYNC/MODESYNC/MODE input threshold voltageSYNC/MODE input high (MODE=FPWM)1.5V
SYNC/MODE input low (MODE = AUTO with diode emulation)0.4
SYNC/MODE input hysteresis0.1851
FSSSFrequency span of spread spectrum operation(2)±4%
FPSSSpread spectrum pattern frequency(2)30Hz
ISYNC/MODESYNC/MODE leakage currentVin = 13.5 V, VSYNC/MODE = 3.3 V1µA
VIN = VSYNC/MODE = 13.5 V5
tMODEMode change transition time (2)To FPWM Mode 20 mA load, VIN = 13.5 V100µs
To AUTO Mode 20-mA load, VIN = 13.5 V60
IL_HSHigh side switch current limit (1)LM53600-Q1 Duty cycle approaches 0%1.01.351.65A
LM53601-Q1 Duty cycle approaches 0%1.51.832.1
IL_LSLow side switch current limitLM53600-Q10.650.780.93A
LM53601-Q11.01.21.43
IL_ZCZero-cross current limit MODE/SYNC = Low–0.01A
IL_NEGNegative current limit MODE/SYNC = HighLM53600-Q1–0.7A
LM53601-Q1–0.7
RdsonPower switch on-resistanceHigh side MOSFET Rdson220
Low side MOSFET Rdson200
VENEnable input threshold voltage - risingEnable rising1.7-2.0V
VEN_HYSTEnable threshold hysteresis0.40-0.55V
VEN_WAKEEnable Wake-up threshold0.4V
IENEnable pin input currentVIN = VEN = 13.5 V2.7µA
VccInternal Vcc voltageVIN = 13.5 V, Vbias= 0 V3.05V
VIN = 13.5 V, Vbias= 3.3 V3.15
Vcc_UVLOInternal Vcc input under voltage lock-outVCC rising2.7V
Vcc_UVLO_hystInput under voltage lock-out hysteresisHysteresis below Vcc_uvlo190mV
IFBInput current from FB to AGNDLM53600-Q1-ADJ, FB = 1 V20nA
VrefReference voltage for ADJ option onlyTj = 25°C0.99311.007V
0.98511.015
RRESETRdson of RESET output50120Ω
TSDThermal shutdown rising threshold(2)151167185°C
TSDFThermal shutdown falling threshold(2)140157
TSD_hystThermal shutdown hysteresis(2)10
DmaxMaximum switch duty cycle(2)Fsw = 2.1 MHz76%
While in frequency fold back96%
High side current limit is a function of duty factor. Current limit value is highest at small duty factor and less at higher duty factors.
Ensured by design, statistical analysis and production testing of correlated parameters; not tested in production.