LM4667ITLX National Semiconductor, LM4667ITLX Datasheet

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LM4667ITLX

Manufacturer Part Number
LM4667ITLX
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LM4667ITLX

Operational Class
Class-AB
Audio Amplifier Output Configuration
1-Channel Mono
Output Power (typ)
1.3x1@8OhmW
Audio Amplifier Function
Speaker
Total Harmonic Distortion
0.8@8Ohm@100mW%
Single Supply Voltage (typ)
3/5V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Rail/rail I/o Type
No
Power Supply Rejection Ratio
65dB
Single Supply Voltage (min)
2.7V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
9
Package Type
uSMD
Lead Free Status / Rohs Status
Not Compliant

Available stocks

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Part Number
Manufacturer
Quantity
Price
Part Number:
LM4667ITLX
Quantity:
1 360
Part Number:
LM4667ITLX
Manufacturer:
NS/国半
Quantity:
20 000
© 2004 National Semiconductor Corporation
LM4667
Filterless High Efficiency 1.3W Switching Audio
Amplifier
General Description
The LM4667 is a fully integrated single-supply high efficiency
switching audio amplifier. It features an innovative modulator
that eliminates the LC output filter used with typical switching
amplifiers. Eliminating the output filter reduces parts count,
simplifies circuit design, and reduces board area. The
LM4667 processes analog inputs with a delta-sigma modu-
lation technique that lowers output noise and THD when
compared to conventional pulse width modulators.
The LM4667 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing on a single 3V supply, it is capable of driving 8Ω trans-
ducer loads at a continuous average output of 450mW with
less than 1%THD+N. Its flexible power supply requirements
allow operation from 2.7V to 5.5V.
The LM4667 has high efficiency with an 8Ω transducer load
compared to a typical Class AB amplifier. With a 3V supply,
the IC’s efficiency for a 100mW power level is 74%, reaching
84% at 450mW output power.
The LM4667 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
The LM4667 has fixed selectable gain of either 6dB or 12dB.
The LM4667 has short circuit protection against a short from
the outputs to V
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
DD
, GND, or across the outputs.
FIGURE 1. Typical Audio Amplifier Application Circuit
DS200405
Key Specifications
Features
n No output filter required for inductive transducers
n Selectable gain of 6dB or 12dB
n Very fast turn on time: 5ms (typ)
n Minimum external components
n "Click and pop" suppression circuitry
n Micro-power shutdown mode
n Short circuit protection
n Available in space-saving micro SMD and MSOP
Applications
n Mobile phones
n PDAs
n Portable electronic devices
j
j
j
j
j
j
packages
Efficiency at 3V, 100mW into 8Ω transducer 74% (typ)
Efficiency at 3V, 450mW into 8Ω transducer 84% (typ)
Efficiency at 5V, 1W into 8Ω transducer
Total quiescent power supply current
Total shutdown power supply current
Single supply range
200405G5
September 2004
www.national.com
2.7V to 5.5V
0.01µA (typ)
3.5mA (typ)
86% (typ)

Related parts for LM4667ITLX

LM4667ITLX Summary of contents

Page 1

... V , GND, or across the outputs. DD Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation Key Specifications j Efficiency at 3V, 100mW into 8Ω transducer 74% (typ) j Efficiency at 3V, 450mW into 8Ω transducer 84% (typ) j Efficiency at 5V, 1W into 8Ω ...

Page 2

... Connection Diagrams 9 Bump micro SMD Package Top View Order Number LM4667ITL, LM4667ITLX See NS Package Number TLA09AAA Mini Small Outline (MSOP) Package Top View Order Number LM4667MM See NS Package Number MUB10A www.national.com 20040536 200405I4 2 micro SMD Marking 200405C6 Top View X — Date Code T — ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note1) Storage Temperature + 0.3V ≥ V ≥ GND - 0.3V Voltage at Any Input Pin V DD Power Dissipation (Note 3) ESD Susceptibility (Note 4) ...

Page 4

Electrical Characteristics V The following specifications apply for V 25˚C. Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD V Shutdown Voltage Input High SDIH V Shutdown Voltage Input Low SDIL V Gain Select Input High GSIH ...

Page 5

Typical Performance Characteristics THD+N vs Frequency 15µH + 8Ω + 15µ 100mW, 30kHz BW OUT THD+N vs Frequency 15µH + 4Ω + 15µ ...

Page 6

Typical Performance Characteristics CMRR vs Frequency 15µH + 8Ω + 15µ 300mV Sine Wave, 30kHz BW CM RMS PSRR vs Frequency 15µH + 8Ω + 15µH ...

Page 7

Typical Performance Characteristics Efficiency and Power Dissipation vs Output Power 15µH + 4Ω + 15µ 1kHz, THD DD L Gain Select Threshold Output Power vs Supply Voltage R = ...

Page 8

Typical Performance Characteristics Output Power vs Supply Voltage R = 15µH + 16Ω + 15µ 1kHz L Shutdown Threshold Supply Current vs Shutdown Voltage R = 15µH + 8Ω + 15µH L www.national.com (Continued) ...

Page 9

Application Information GENERAL AMPLIFIER FUNCTION The output signals generated by the LM4667 consist of two, BTL connected, output signals that pulse momentarily from near ground potential The two outputs can pulse DD independently with the exception that ...

Page 10

Application Information the shutdown voltage has crossed the threshold. To mini- mize the supply current while in the shutdown state, the Shutdown pin should be driven to GND or left floating. If the Shutdown pin is not driven to GND, ...

Page 11

Application Information SINGLE-ENDED CIRCUIT CONFIGURATIONS FIGURE 2. Single-Ended Input with low gain selection configuration FIGURE 3. Single-Ended Input with high gain selection configuration (Continued) 11 200405C8 200405C9 www.national.com ...

Page 12

Application Information REFERENCE DESIGN BOARD SCHEMATIC In addition to the minimal parts required for the application circuit, a measurement filter is provided on the evaluation circuit board so that conventional audio measurements can be conveniently made without additional equipment. This ...

Page 13

Application Information LM4667 micro SMD BOARD ARTWORK Composite View Top Layer (Continued) 200405G7 200405D1 13 Silk Screen 200405G6 Bottom Layer 200405G8 www.national.com ...

Page 14

Application Information LM4667 MSOP BOARD ARTWORK Composite View Top Layer www.national.com (Continued) 200405I1 200405I3 14 Silk Screen 200405I2 Bottom Layer 200405I0 ...

Page 15

... Physical Dimensions inches (millimeters) unless otherwise noted 9 Bump micro SMD Order Number LM4667ITL, LM4667ITLX NS Package Number TLA09AAA X1 = 1.514 X2 = 1.514 X3 = 0.600 Mini Small Outline (MSOP) Order Number LM4667MM NS Package Number MUB10A 15 www.national.com ...

Page 16

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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