lm4665mm National Semiconductor Corporation, lm4665mm Datasheet

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lm4665mm

Manufacturer Part Number
lm4665mm
Description
Filterless High Efficiency 1w Switching Audio Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2002 National Semiconductor Corporation
LM4665
Filterless High Efficiency 1W Switching Audio Amplifier
General Description
The LM4665 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
LM4665 processes analog inputs with a delta-sigma modu-
lation technique that lowers output noise and THD when
compared to conventional pulse width modulators.
The LM4665 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 400mW with
less than 2%THD+N.
The LM4665 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 75%, reaching
80% at 400mW output power.
The LM4665 features a low-power consumption shutdown
mode. Shutdown may be enabled by either a logic high or
low depending on the mode selection. Connecting the Shut-
down Mode pin to either V
the Shutdown pin to be driven in a likewise manner to
activate shutdown.
The LM4665 has fixed selectable gain of either 6dB or 12dB.
The LM4665 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.
DD
(high) or GND (low) enables
FIGURE 1. Typical Audio Amplifier Application Circuit
DS200270
Key Specifications
Features
n No output filter required for inductive transducers
n Selectable gain of 6dB (2V/V) or 12dB (4V/V)
n Very fast turn on time: 5ms (typ)
n User selectable shutdown High or Low logic level
n Minimum external components
n "Click and pop" suppression circuitry
n Micro-power shutdown mode
n Short circuit protection
n micro SMD, LLP, and MSOP packages (no heat sink
Applications
n Mobile phones
n PDAs
n Portable electronic devices
j
j
j
j
j
j
required)
Efficiency at 100mW into 8Ω transducer
Efficiency at 400mW into 8Ω transducer
Total quiescent power supply current (3V)
Total shutdown power supply current (3V) 0.01µA(typ)
Single supply range (MSOP & LD)
Single supply range (ITL) (Note 11)
20027001
December 2002
www.national.com
2.7V to 5.5V
2.7V to 3.8V
75%(typ)
80%(typ)
3mA(typ)

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lm4665mm Summary of contents

Page 1

... The LM4665 has short circuit protection against a short from the outputs GND or across the outputs. DD Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation Key Specifications j Efficiency at 100mW into 8Ω transducer j Efficiency at 400mW into 8Ω transducer j ...

Page 2

... A2 - LM4665ITL www.national.com 20027023 Order Number LM4665ITL, LM4665ITLX See NS Package Number TLA09AAA 200270D0 200270C6 2 9 Bump micro SMD Package 20027036 Top View MSOP Marking 200270C5 Top View G - Boomer Family C5 - LM4665MM 200270C9 Top View Z - Plant Code XY - Date Code TT- Die Traceability Bottom Line-Part Number ...

Page 3

Absolute Maximum Ratings 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 + 0.3V ≥ V ≥ GND - 0.3V Voltage at Any Input ...

Page 4

Electrical Characteristics V The following specifications apply for V erwise specified. Limits apply for T A Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD V Shutdown Voltage Input High SDIH V Shutdown Voltage Input Low SDIL ...

Page 5

Typical Performance Characteristics THD+N vs Frequency 8Ω + 33µ 400mW, 30kHz BW OUT THD+N vs Frequency V = 3.3V 4Ω + 33µ 300mW, 30kHz BW ...

Page 6

Typical Performance Characteristics THD+N vs Common-Mode Voltage 8Ω + 33µ 1kHz 400mW, 22kHz BW OUT CMRR vs Frequency 8Ω + 33µ ...

Page 7

Typical Performance Characteristics PSRR vs Frequency 8Ω + 33µ 100mV Sine Wave, 22kHz BW CM RMS Efficiency (top trace) and Power Dissipation (bottom trace) vs Output Power V = 5V, R ...

Page 8

Typical Performance Characteristics Output Power vs Supply Voltage R = 16Ω + 33µ 1kHz L Output Power vs Supply Voltage R = 4Ω + 33µ 1kHz L Shutdown Hysteresis Voltage V = 3V, SD Mode = ...

Page 9

Typical Performance Characteristics Shutdown Hysteresis Voltage V = 3V, SD Mode = GND (SD High) DD Application Information GENERAL AMPLIFIER FUNCTION The output signals generated by the LM4665 consist of two, BTL connected, output signals that pulse momentarily from near ...

Page 10

Application Information the output pins to the load and the supply pins to the power supply should be as wide as possible to minimize trace resistance. The rising and falling edges are necessarily short in relation to the minimum pulse ...

Page 11

Application Information FIGURE 2. Increased Supply Voltage Operating Range for the micro SMD package SINGLE-ENDED CIRCUIT CONFIGURATIONS FIGURE 3. Single-Ended Input, Shutdown High and Gain of 6dB Configuration (Continued) 11 200270E5 200270C4 www.national.com ...

Page 12

Application Information FIGURE 4. Single-Ended Input, Shutdown High and Gain of 12dB Configuration FIGURE 5. Single-Ended Input, Shutdown Low and Gain of 6dB Configuration www.national.com (Continued) 12 200270C2 200270C3 ...

Page 13

Application Information FIGURE 6. Single-Ended Input, Shutdown Low and Gain of 12dB Configuration REFERENCE DESIGN BOARD SCHEMATIC (Continued) FIGURE 7. 13 200270C1 200270B1 www.national.com ...

Page 14

Application Information 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 is a balanced input ...

Page 15

Application Information LM4665 LLP BOARD ARTWORK Composite View Top Layer (Continued) 200270D1 200270D3 15 Silk Screen 200270D2 Bottom Layer 200270D4 www.national.com ...

Page 16

Application Information LM4665 micro SMD BOARD ARTWORK Composite View Top Layer www.national.com (Continued) 200270C7 200270B9 16 Silk Screen 200270C8 Bottom Layer 200270C0 ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted 9 Bump micro SMD Order Number LM4665ITL, LM4665ITLX NS Package Number TLA09AAA X = 1.514 X = 1.514 X = 0.600 Mini Small Outline (MSOP) Order Number LM4665MM NSPackage Number MUB10A 17 www.national.com ...

Page 18

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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