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LM4671 Dataheets PDF



Part Number LM4671
Manufacturers National Semiconductor
Logo National Semiconductor
Description Filterless High Efficiency 2.5W Switching Audio Amplifier
Datasheet LM4671 DatasheetLM4671 Datasheet (PDF)

LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier www.DataSheet4U.com March 3, 2008 LM4671  Filterless High Efficiency 2.5W Switching Audio Amplifier General Description The LM4671 is a single supply, high efficiency 2.5W switching audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. The LM4671 is designed to meet the demands of mobile phones and ot.

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LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier www.DataSheet4U.com March 3, 2008 LM4671  Filterless High Efficiency 2.5W Switching Audio Amplifier General Description The LM4671 is a single supply, high efficiency 2.5W switching audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. The LM4671 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The LM4671 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3V supply driving an 8Ω speaker, the IC's efficiency for a 100mW power level is 80%, reaching 88% at 400mW output power. The LM4671 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND). The gain of the LM4671 is externally configurable which allows independent gain control from multiple sources by summing the signals. Key Specifications ■ Efficiency @ 3.6V, 100mW into   8Ω speaker 80% (typ) 88% (typ) 86% (typ) 2.8mA (typ) 0.01µA (typ) 2.4V to 5.5V ■ Efficiency @ 3.6V, 400mW into    8Ω speaker speaker ■ Efficiency @ 5V, 1W into 8Ω ■ Quiescent current, 3.6V supply ■ Total shutdown power supply current ■ Single supply range Features ■ ■ ■ ■ ■ ■ ■ No output filter required for inductive loads Externally configurable gain Very fast turn on time: 17μs (typ) Minimum external components "Click and pop" suppression circuitry Micro-power shutdown mode Available in space-saving microSMD package Applications ■ Mobile phones ■ PDAs ■ Portable electronic devices Typical Application 201073j3 FIGURE 1. Typical Audio Amplifier Application Circuit Boomer® is a registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation 201073 www.national.com LM4671 Connection Diagrams 9 Bump micro SMD Package www.DataSheet4U.com micro SMD Marking 201073c6 Top View X — Date Code T— Die Traceability G — Boomer Family E7 — LM4671ITL 20107336 Top View Order Number LM4671ITL, LM4671ITLX See NS Package Number TLA09AAA www.national.com 2 LM4671 Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note 1) Storage Temperature Voltage at Any Input Pin 6.0V −65°C to +150°C Thermal Resistance www.DataSheet4U.com 220°C/W  θJA (micro SMD) Soldering Information See AN-1112 "microSMD Wafers Level Chip Scale Package." VDD + 0.3V ≥ V ≥ GND - 0.3V Power Dissipation (Note 3) Internally Limited ESD Susceptibility, all other pins (Note 4) 2.0kV ESD Susceptibility (Note 5) 200V Junction Temperature (TJMAX) 150°C Operating Ratings Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage (Notes 1, 2) −40°C ≤ TA ≤ 85°C 2.4V ≤ VDD ≤ 5.5V Electrical Characteristics (Notes 1, 2) The following specifications apply for AV = 2V/V (RI = 150kΩ), RL = 15µH + 8Ω + 15µH unless otherwise specified. Limits apply for TA = 25°C. LM4671 Symbol Parameter Conditions VI = 0V, AV = 2V/V, VDD = 2.4V to 5.0V Typical (Note 6) |VOS| Differential Output Offset Voltage 5 61 68 17 0.9 6.4 3.8 2.0 0.01 1.2 1.1 VSHUTDOWN = 0.4V 100 300kΩ/RI 300 RL = 15μH + 4Ω + 15μH THD = 10% (max) f = 1kHz, 22kHz BW VDD = 5V VDD = 3.6V VDD = 2.5V RL = 15μH + 4Ω + 15μH THD = 1% (max) f = 1kHz, 22kHz BW VDD = 5V VDD = 3.6V VDD = 2.5V 270kΩ/RI 330kΩ/RI 6.2 3.0 1 1.4 0.4 100 5 Limit (Notes 7, 8) Units (Limits) mV (max) dB (min) dB (min) μA (max) μA (max) mA (max) mA mA (max) μA (max) V (min) V (max) kΩ V/V (min) V/V (max) kΩ PSRRGSM GSM Power Supply Rejection Ratio VDD = 2.4V to 5.0V CMRRGSM |IIH| |IIL| IDD VDD = 2.4V to 5.0V GSM Common Mode Rejection Ratio VIC = VDD/2 to 0.5V, VIC = VDD/2 to VDD – 0.8V Logic High Input Current Logic Low Input Current Quiescent Power Supply Current VDD = 5.0V, VI = 5.5V VDD = 5.0V, VI = –0.3V VIN = 0V, No Load, VDD = 5.0V VIN = 0V, No Load, VDD = 3.6V VIN = 0V, No Load, VDD =2.4V ISD VSDIH VSDIL ROSD AV RSD Shutdown Current Shutdown voltage input high Shutdown voltage input low Output Impedance Gain Resistance from Shutdown Pin to GND VSHUTDOWN = 0V VDD = 2.4V to 5.0V PO Output Power 2.5 1.3 520 W W mW 2.21 1.06 420 W W mW 3 www.national.com LM4671 Symbol Parameter Conditions RL = 15μH + 8Ω + 15μH THD = 10% (max) f = 1kHz, 22kHz BW VDD = 5V VDD = 3.6V VDD = 2.5V RL = 15μH + 8Ω + 15μH THD = 1% (max) f = 1kHz, 22kHz BW VDD = 5V VDD = 3.6V VDD = 2.5V VDD = 5V, PO = 0.1WRMS, f = 1kHz LM4671 www.DataSheet4U.com Units Typical Limit (Limits) (Note 6) (Notes 7, 8) 1.7 870 425 W mW mW PO Output Power 1.19 700 350 0.09 0.04 0.12 0.05 600 W mW mW % %.


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