SNAS416K July   2007  – November 2019 LM48511

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      EMI Graph: LM48511 RF Emissions — 3-Inch Cable
  4. 4 Revision History
  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 VDD = 5 V
    6. 6.6 Electrical Characteristics VDD = 3.6 V
    7. 6.7 Electrical Characteristics VDD = 3 V
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 General Amplifier Function
      2. 7.3.2 Differential Amplifier Explanation
      3. 7.3.3 Audio Amplifier Power Dissipation and Efficiency
      4. 7.3.4 Regulator Power Dissipation
      5. 7.3.5 Shutdown Function
      6. 7.3.6 Regulator Feedback Select
    4. 7.4 Device Functional Modes
      1. 7.4.1 7.4.1 Fixed Frequency
      2. 7.4.2 7.4.2 Spread Spectrum Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Proper Selection of External Components
        2. 8.2.2.2  Power Supply Bypassing
        3. 8.2.2.3  Audio Amplifier Gain Setting Resistor Selection
        4. 8.2.2.4  Audio Amplifier Input Capacitor Selection
        5. 8.2.2.5  Selecting Regulator Output Capacitor
        6. 8.2.2.6  Selecting Regulating Bypass Capacitor
        7. 8.2.2.7  Selecting the Soft-Start (CSS) Capacitor
        8. 8.2.2.8  Selecting Diode (D1)
        9. 8.2.2.9  Duty Cycle
        10. 8.2.2.10 Selecting Inductor Value
        11. 8.2.2.11 Inductor Supplies
        12. 8.2.2.12 Setting the Regulator Output Voltage (PV1)
        13. 8.2.2.13 Discontinuous and Continuous Operation
        14. 8.2.2.14 ISW Feed-Forward Compensation for Boost Converter
        15. 8.2.2.15 Calculating Regulator Output Current
        16. 8.2.2.16 Design Parameters VSW and ISW
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Power and Ground Circuits
      2. 10.1.2 Layout Helpful Hints
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.7 Electrical Characteristics VDD = 3 V

The following specifications apply for VDD = 3 V, PV1 = 4.8 V (continuos mode), AV = 2V/V, R3 = 25.5 kΩ, RLS = 9.31 kΩ,
RL = 8 Ω, f = 1 kHz, SS/FF = GND, unless otherwise specified. Limits apply for TA = 25°C.(5)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
IDD Quiescent Power Supply Current VIN = 0, RLOAD = ∞ Fixed Frequency Mode (FF) 9 mA
Spread Spectrum Mode (SS) 9.5 mA
ISD Shutdown Current(3) VSD_BOOST = VSD_AMP = SS = FB_SEL = GND 0.01 1 μA
VIH Logic Voltage Input High 0.91 V
VIL Logic Voltage Input Low 0.79 V
TWU Wake-up Time CSS = 0.1μF 49 ms
VOS Output Offset Voltage(6)   0.04 mV
PO Output Power RL = 8 Ω, f = 1 kHz,
BW = 22 kHz
THD+N = 1%		 FF 1 W
SS 0.84 1
RL = 8 Ω, f = 1 kHz,
BW = 22 kHz
THD+N = 10%		 FF 1.3 W
SS 1.3
RL = 4 Ω, f = 1 kHz,
BW = 22 kHz
THD+N = 1%		 FF 1.8 W
SS 1.8
RL = 4 Ω, f = 1 kHz,
BW = 22 kHz
THD+N = 10%		 FF 2.2 W
SS 2.2
THD+N Total Harmonic Distortion + Noise PO = 500 mW, f = 1 kHz,
RL = 8 Ω 		FF  0.02%
SS 0.03%
PO = 500 mW, f = 1 kHz,
RL = 4 Ω 		FF  0.04%
SS 0.06%
εOS Output Noise f = 20Hz to 20kHz
Inputs to AC GND, No weighting		 FF  35 µVRMS
SS 35
f = 20 Hz to 20 kHz
Inputs to AC GND, A weighted		 FF  25 µVRMS
SS 25
PSRR Power Supply Rejection Ratio
(Input Referred)		 VRIPPLE = 200 mVP-P Sine,
fRIPPLE = = 217 Hz 		FF 89 dB
SS 89
VRIPPLE = 200 mVP-P Sine,
fRIPPLE = = 1 kHz 		FF 88 dB
SS 88
VRIPPLE = 200 mVP-P Sine,
fRIPPLE = = 10 kHz 		FF 78 dB
SS 78
CMRR Common-Mode Rejection Ratio
(Input Referred)		 VRIPPLE = 1 VP-P, fRIPPLE = 217 Hz 71 dB
η Efficiency f = 1 kHz, RL = 8 Ω, PO = 1 W 75%
VFB Feedback Pin Reference Voltage(4) 1.23 V
(1) Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of product characterization and are not specified.
(2) The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJJA, and the ambient temperature, TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM48511, see Figure 20 for additional information.
(3) Shutdown current is measured with components R1 and R2 removed.
(4) Feedback pin reference voltage is measured with the Audio Amplifier disconnected from the Boost converter (the Boost converter is unloaded).
(5) RL is a resistive load in series with two inductors to simulate an actual speaker load for RL = 8Ω, the load is 15μH+8Ω+15μH. For
RL = 4 Ω, the load is 15 μH + 4 Ω + 15 μH.
(6) Offset voltage is determined by: (IDD (with load) — IDD (no load)) x RL.