SLVSH98A July   2023  – November 2023 LP8868U-Q1 , LP8868V-Q1 , LP8868W-Q1 , LP8868X-Q1 , LP8868Y-Q1 , LP8868Z-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4  Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Adaptive Off-Time Current Mode Control
        1. 7.3.1.1 Switching Frequency Settings
        2. 7.3.1.2 Spread Spectrum
      2. 7.3.2 Setting LED Current
      3. 7.3.3 Internal Soft Start
      4. 7.3.4 Dimming Mode
        1. 7.3.4.1 PWM dimming
        2. 7.3.4.2 Analog dimming
        3. 7.3.4.3 Hybrid Dimming
        4. 7.3.4.4 Flexible Dimming
      5. 7.3.5 Undervoltage Lockout
      6. 7.3.6 Fault Protection
      7. 7.3.7 Thermal Foldback
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 LP8868XQDMTRQ1 12-V Input, 1-A Output, 8-piece LED With Boost Topology
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Inductor Selection
          2. 8.2.1.2.2 Input Capacitor Selection
          3. 8.2.1.2.3 Output Capacitor Selection
          4. 8.2.1.2.4 Sense Resistor Selection
          5. 8.2.1.2.5 Other External Components Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 LP8868YQDMTRQ1 12-V Input, 1-A Output, 5-piece LED With Buck-Boost Topology
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Inductor Selection
          2. 8.2.2.2.2 Input Capacitor Selection
          3. 8.2.2.2.3 Output Capacitor Selection
          4. 8.2.2.2.4 Sense Resistor Selection
          5. 8.2.2.2.5 Other External Components Selection
        3. 8.2.2.3 Application Curves
      3. 8.2.3 LP8868ZQDMTRQ1 12-V Input, 2-A Output, 1-piece LED With Buck Topology
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
          1. 8.2.3.2.1 Inductor Selection
          2. 8.2.3.2.2 Input Capacitor Selection
          3. 8.2.3.2.3 Output Capacitor Selection
          4. 8.2.3.2.4 Sense Resistor Selection
          5. 8.2.3.2.5 Other External Components Selection
        3. 8.2.3.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

6.5 Electrical Characteristics

The electrical ratings specified in this section apply to all specifications in this document, unless otherwise noted. These specifications are interpreted as conditions that do not degrade the device parametric or functional specifications for the life of the product containing it. TJ = –40°C to +125°C, VIN = 4.5 V to 60 V, (unlessotherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
VVIN_UVLO VIN undervoltage lockout Rising VIN 3.0 3.2 3.4 V
Falling VIN 2.8 3.0 3.2 V
Hysteresis 0.2 V
ISD Shut down current from VIN VIN = 12 V, VEN/PWM = 0 V 0.8 2.3 µA
IOFF PWM off current from VIN VIN = 12 V, VEN/PWM = 0 V 2.5 mA
IOP Normal operating current 400-kHz switching frequency 4.6 mA
IOP Normal operating current 2.2-MHz switching frequency 10.0 mA
VVCC Internal LDO output voltage IVCC = 10mA 5.0 5.15 5.3 V
IVCC_LIM Internal LDO output current limit 38 47 56 mA
DIMMING
VPWM_L Low-level input voltage 0.4 V
VPWM_H High-level input voltage 1.2 V
VADIM_L Low-level input voltage 0.4 V
VADIM_H High-level input voltage 1.2 V
tPWM_OUT_ON PWM output minimum on time 150 ns
tPWM_IN_ON PWM input minimum on time 150 ns
tPWM_IN_OFF PWM input minimum off time to disable device 57 77 ms
fADIM Analog Dimming input frequency 6-bit ADIM resolution 0.1 156 kHz
fADIM Analog Dimming input frequency 8-bit ADIM resolution 0.1 39 kHz
FAULT
VOL Output level low I = 3mA 0.1 V
ILEAKAGE Output leakage current V = 5 V 1 µA
FEEDBACK AND ERROR AMPLIFIER
gM(ea) Transconductance gain ADIM 100% duty cycle, VCSP-CSN = 200mV, VCOMP = 1.5V 205 265 325 μA/V
ICOMP Source/sink current ADIM 100% duty cycle, VCSP-CSN = 200mV ± 200mV, VCOMP = 1.5V ±24 ±40 ±56 µA
VCSP-CSN Current sense threshold ADIM 100% duty cycle 194 200 206 mV
VCSP-CSN Current sense threshold ADIM 12.5% duty cycle, compared with 100% duty cycle 11.875 12.5 13.125 %
VCSP-CSN Current sense threshold ADIM 1.17% duty cycle, compared with 100% duty cycle 0.82 1.17 1.52 %
ILEAK_CSP/N CSP+CSN pin leakage current VIN = 60 V, VEN/PWM = 5 V 22 31 µA
ILEAK_CSP/N CSP+CSN pin leakage current VIN = 60 V, VEN/PWM = 0 V 10 15 µA
POWER STAGE
RDSON Switching FET on resistance  VIN ≥ 5 V 150 mΩ
tmin_ON Switching FET minimum on time 100 ns
tmin_OFF Switching FET minimum off time 100 ns
fSW Switching FET frequency 0.1 2.2 MHz
CURRENT LIMIT
ILIM Switching FET cycle-by-cycle current limit (LP8868X/LP8868Y/LP8868U/LP8868V) 5.8 6.5 7.6 A
ILIM Switching FET cycle-by-cycle current limit (LP8868Z/LP8868W) 5.2 6 7 A
THERMAL PROTECTION
Tth Thermal foldback starting temperature threshold RTEMP = 20 kΩ 130 °C
TTSD Thermal shutdown temperature 165 °C
Hysteresis 15 °C