SNVSAA7B December   2015  – July 2021 LM53625-Q1 , LM53635-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 Characteristics
    8. 7.8 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
      1. 8.2.1 Control Scheme
    3. 8.3 Feature Description
      1. 8.3.1 RESET Flag Output
      2. 8.3.2 Enable and Start-Up
      3. 8.3.3 Soft-Start Function
      4. 8.3.4 Current Limit
      5. 8.3.5 Hiccup Mode
      6. 8.3.6 Synchronizing Input
      7. 8.3.7 Undervoltage Lockout (UVLO) and Thermal Shutdown (TSD)
      8. 8.3.8 Input Supply Current
    4. 8.4 Device Functional Modes
      1. 8.4.1 AUTO Mode
      2. 8.4.2 FPWM Mode
      3. 8.4.3 Dropout
      4. 8.4.4 Input Voltage Frequency Foldback
    5. 8.5 Spread-Spectrum Operation
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 General Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 External Components Selection
            1. 9.2.1.2.1.1 Input Capacitors
              1. 9.2.1.2.1.1.1 Input Capacitor Selection
            2. 9.2.1.2.1.2 Output Inductors and Capacitors Selection
              1. 9.2.1.2.1.2.1 Inductor Selection
              2. 9.2.1.2.1.2.2 Output Capacitor Selection
          2. 9.2.1.2.2 Setting the Output Voltage
            1. 9.2.1.2.2.1 FB for Adjustable Versions
          3. 9.2.1.2.3 VCC
          4. 9.2.1.2.4 BIAS
          5. 9.2.1.2.5 CBOOT
          6. 9.2.1.2.6 Maximum Ambient Temperature
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Fixed 5-V Output for USB-Type Applications
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Fixed 3.3-V Output
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
        3. 9.2.3.3 Application Curves
      4. 9.2.4 Adjustable Output
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
        3. 9.2.4.3 Application Curves
    3. 9.3 What to Do and What Not to Do
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    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

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RNL|22
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Electrical Characteristics

Limits apply over the recommended operating junction temperature range of –40°C to +150°C, unless otherwise noted. 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 = 13.5 V.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
VFBInitial output voltage accuracyVIN = 3.8 V to 36 V, TJ = 25°C–1%1%
VIN = 3.8 V to 36 V–1.5%1.5%
IQOperating quiescent current; measured at VIN pin when enabled and not switching(1)VIN = 13.5 V, VBIAS = 5 V6µA
VIN = 13.5 V, VBIAS = 5 V, TJ = 85°C16
IBBias current into BIAS pin, enabled, not switchingVIN = 13.5 V, VBIAS = 5 V, FPWM = 0 V35µA
VIN = 13.5 V, VBIAS = 3.3 V, FPWM = 0 V35
ISDShutdown quiescent current; measured at VIN pinEN ≤ 0.4 V, TJ = 25°C2µA
EN ≤ 0.4 V, TJ = 85°C3
EN ≤ 0.4V, TJ = 150°C5
VIN-OPERATEMinimum input voltage to operateRising3.23.553.95V
Falling2.953.253.55
Hysteresis0.280.30.4
VRESETRESET upper threshold voltageRising, % of VOUT105%107%110%
RESET lower threshold voltageFalling, % VOUT92%94%96.5%
Magnitude of RESET lower threshold from steady state output voltageSteady-state output voltage and RESET threshold read at the same TJ and VIN96%
VRESET_HYSTRESET hysteresis as a percent of output voltage setpoint±1
VRESET_VALIDMinimum input voltage for proper RESET function50-µA pullup to RESET pin, EN = 0 V, TJ= 25°C1.5V
VOLLow level RESET function output voltage50-µA pullup to RESET pin, VIN =1.5 V, EN = 0 V0.4V
0.5-mA pullup to RESET pin, VIN =13.5 V, EN=0 V0.4
1-mA pullup to RESET pin, VIN =13.5 V, EN=3.3 V0.4
FSWSwitching frequencyVIN = 13.5 V, center frequency with spread spectrum, PWM operation1.852.12.35MHz
VIN = 13.5 V, without spread spectrum, PWM operation1.852.12.35
FSYNCSync frequency range1.92.12.3MHz
DSYNCSync input duty cycle rangeHigh state input < 5.5 V and > 2.3 V25%75%
VFPWMFPWM input threshold voltageFPWM input high (MODE = FPWM)1.5V
FPWM input low (MODE = AUTO with diode emulation)0.4
FPWM input hysteresis0.151
FSSSFrequency span of spread spectrum operation±3%
FPSSSpread-spectrum pattern frequency(2)9Hz
FSW-SSSwitching Frequency while in spread spectrumVIN = 13.5 V, PWM operation1.81MHz
IFPWMFPWM leakage currentVIN = 13.5 V, VFPWM = 3.3 V1µA
VIN = VFPWM = 13.5 V5
ISYNCSYNC leakage currentVIN = 13.5 V, VSYNC = 3.3 V1µA
VIN = VSYNC = 13.5 V5
IL-HSHigh-side switch current limitLM536253.556.5A
LM536354.567.5
IL-LSLow-side switch current limitLM536252.53.54.1A
LM536353.54.55.1
IL-ZCZero-cross current limit FPWM = low–0.02A
IL-NEGNegative current limit FPWM = high–1.5
RDSONPower switch on-resistanceHigh-side MOSFET RDSON, VIN = 13 V, IL=1A60130
Low-side MOSFET RDSON, VIN = 13 V, IL=1A4080
VENEnable input threshold voltage - risingEnable rising1.72V
VEN_HYSTEnable threshold hysteresis0.450.55V
VEN_WAKEEnable wake-up threshold0.4V
IENEN pin input currentVIN = VEN = 13.5 V25µA
VCCInternal VCC voltageVIN 13.5 V, VBIAS = 0 V3.05V
VIN = 13.5 V, VBIAS = 3.3 V3.15
VCC_UVLOInternal VCC input undervoltage lockoutVIN rising2.7V
Hysteresis below VCC-UVLO185mV
IFBInput current from FB to AGNDAdjustable LM53625/35-Q1, FB=1 V20nA
VREFReference voltage for adjustable option onlyTJ = 25°C0.99311.007V
TJ = –40°C to 125°C0.9911.01
TJ = –40°C to 150°C0.98511.015
RRESETRDSON of RESEToutputPull FB pin low. Sink 1-mA at RESET pin5085Ω
VSYNCVIH1.5V
VIL0.4
VHYST0.151
TSDThermal shutdown thresholds(2)Rising155175°C
Hysteresis15
DMAXMaximum switch duty cycleFsw = 2.1 MHz80%
While in dropout(2)98%
This is the current used by the device while not switching, open loop on the ATE. It does not represent the total input current from the regulator system.
Ensured by Design, Not tested at production.