Datasheet

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LM4670

www.ti.com

SNAS240C –DECEMBER 2004–REVISED MAY 2013

LM4670 Boomer™ Audio Power Amplifier Series Filterless High Efficiency 3W Switching

Audio Amplifier

Check for Samples: LM4670

FEATURES

DESCRIPTION

The LM4670 is a fully integrated single-supply high

• No Output Filter Required for Inductive Loads

efficiency switching audio amplifier. It features an

• Externally Configurable Gain

innovative modulator that eliminates the LC output

• Very Fast Turn on Time: 1.35ms (Typ)

filter used with typical switching amplifiers.

Eliminating the output filter reduces external

• Minimum External Components

component count, simplifies circuit design, and

• "Click and Pop" Suppression Circuitry

reduces board area. The LM4670 processes analog

• Micro-Power Shutdown Mode

inputs with a delta-sigma modulation technique that

lowers output noise and THD when compared to

• Short Circuit Protection

conventional pulse width modulators.

• Available in Space-Saving DSBGA and WSON

Packages

The LM4670 is designed to meet the demands of

mobile phones and other portable communication

devices. Operating on a single 5V supply, it is

APPLICATIONS

capable of driving a 4Ω speaker load at a continuous

• Mobile Phones

average output of 2.3W with less than 1% THD+N. Its

• PDAs

flexible power supply requirements allow operation

from 2.4V to 5.5V.

• Portable Electronic Devices

The LM4670 has high efficiency with speaker loads

KEY SPECIFICATIONS

compared to a typical Class AB amplifier. With a 3.6V

supply driving an 8Ω speaker, the IC's efficiency for a

• Efficiency at 3.6V, 100mW into 8Ω Speaker,

100mW power level is 77%, reaching 88% at 600mW

77% (Typ)

output power.

• Efficiency at 3.6V, 600mW into 8Ω Speaker,

The LM4670 features a low-power consumption

88% (Typ)

shutdown mode. Shutdown may be enabled by

• Efficiency at 5V, 1W into 8Ω Speaker, 87%

driving the Shutdown pin to a logic low (GND).

(Typ)

The gain of the LM4670 is externally configurable

• Quiescent Current, 3.6V Supply, 4.8mA (Typ)

which allows independent gain control from multiple

• Total Shutdown Power Supply Current, 0.01µA

sources by summing the signals.

(Typ)

• Single Supply Range, 2.4 to 5.5V

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2Boomer is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (24 pages)

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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 LM4670 Boomer™ Audio Power Amplifier Series Filterless High Efficiency 3W Switching Audio Amplifier Check for Samples: LM4670 FEATURES DESCRIPTION • • • • • • • • The LM4670 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.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com Typical Application Figure 1. Typical Audio Amplifier Application Circuit Connection Diagram GND IN+ A Vo1 VDD B GND IN- C Vo2 1 2 SHUTDOWN 3 PVDD Figure 2. 9 Bump DSBGA Package Top View See Package Number YZR0009 Figure 3. WSON Package Top View See Package Number NGQ0008A These devices have limited built-in ESD protection.
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 Absolute Maximum Ratings (1) (2) Supply Voltage (1) 6.0V −65°C to +150°C Storage Temperature VDD + 0.3V ≥ V ≥ GND - 0.3V Voltage at Any Input Pin Power Dissipation (3) Internally Limited (4) 2.0kV ESD Susceptibility ESD Susceptibility (5) 200V Junction Temperature (TJMAX) Thermal Resistance 150°C θJA (DSBGA) 220°C/W θJA (WSON) 73°C/W Soldering Information See AN-1112 (SNVA009) "DSBGA Wafers Level Chip Scale Package.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com Electrical Characteristics (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. Symbol Parameter Conditions LM4670 Typical (3) Limit (4) (5) Units (Limits) 25 mV (max) |VOS| Differential Output Offset Voltage VI = 0V, AV = 2V/V, VDD = 2.4V to 5.0V PSRRGSM GSM Power Supply Rejection Ratio VDD = 2.4V to 5.
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 Electrical Characteristics(1)(2) (continued) The following specifications apply for AV = 2V/V (RI = 150kΩ), RL = 15µH + 8Ω + 15µH unless otherwise specified. Limits apply for TA = 25°C.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (1) (1) 6 THD+N vs Frequency VDD = 2.5V, RL = 15µH + 4Ω + 15µH POUT = 375mW, 22kHz BW THD+N vs Frequency VDD = 3.6V, RL = 15µH + 4Ω + 15µH POUT = 750mW, 22kHz BW Figure 4. Figure 5. THD+N vs Frequency VDD = 5V, RL = 15µH + 4Ω + 15µH POUT = 1.5W, 22kHz BW THD+N vs Frequency VDD = 2.5V, RL = 15µH + 8Ω + 15µH POUT = 200mW, 22kHz BW Figure 6. Figure 7. THD+N vs Frequency VDD = 3.
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 Typical Performance Characteristics(1) (continued) THD+N vs Output Power RL = 15µH + 4Ω + 15µH f = 1kHz, 22kHz BW THD+N vs Output Power RL = 15µH + 8Ω + 15µH f = 1kHz, 22kHz BW Figure 10. Figure 11. CMRR vs Frequency VDD = 3.6V, RL = 15µH + 8Ω + 15µH VCM = 1VP-P Sine Wave, 22kHz BW PSRR vs Frequency VDD = 3.6V, RL = 15µH + 8Ω + 15µH VCM = 200mVP-P Sine Wave, 22kHz BW Figure 12. Figure 13.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics(1) (continued) 8 Output Power vs Supply Voltage RL = 15µH + 4Ω + 15µH, f = 1kHz, 22kHz BW Output Power vs Supply Voltage RL = 15µH + 8Ω + 15µH, f = 1kHz, 22kHz BW Figure 16. Figure 17. Supply Current (RMS) vs Output Power RL = 15µH + 4Ω + 15µH, f = 1kHz Supply Current (RMS) vs Output Power RL = 15µH + 8Ω + 15µH, f = 1kHz Figure 18. Figure 19.
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 Typical Performance Characteristics(1) (continued) Supply Current vs Shutdown Voltage RL = 15µH + 8Ω + 15µH Supply Current vs Supply Voltage RL = 15µH + 8Ω + 15µH Figure 22. Figure 23. Supply Current vs Supply Voltage RL = Different µH loads Differential Gain vs Supply Voltage RL = 15µH + 8Ω + 15µH, Ri = 150kΩ, f = 1kHz Figure 24. Figure 25.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com APPLICATION INFORMATION GENERAL AMPLIFIER FUNCTION The output signals generated by the LM4670 consist of two, BTL connected, output signals that pulse momentarily from near ground potential to VDD. The two outputs can pulse independently with the exception that they both may never pulse simultaneously as this would result in zero volts across the BTL load. The minimum width of each pulse is approximately 350ns.
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 The rising and falling edges are necessarily short in relation to the minimum pulse width (350ns), having approximately 16ns rise and fall times, typical, depending on parasitic output capacitance. The inductive nature of the transducer load can also result in overshoot on one or both edges, clamped by the parasitic diodes to GND and VDD in each case.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com The input capacitors may also be used to remove low audio frequencies. Small speakers cannot reproduce low bass frequencies so filtering may be desired . When the LM4670 is using a single-ended source, power supply noise on the ground is seen as an input signal by the +IN input pin that is capacitor coupled to ground (see Figure 29 to Figure 31).
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 Figure 27. Differential input configuration with input capacitors Figure 28. Dual differential input configuration Figure 29.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com Figure 30. Dual single-ended input configuration Figure 31.
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 REFERENCE DESIGN BOARD SCHEMATIC Figure 32. 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.
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LM4670 SNAS240C – DECEMBER 2004 – REVISED MAY 2013 www.ti.com LM4670 DSBGA BOARD ARTWORK 16 Figure 33. Composite View Figure 34. Silk Screen Figure 35. Top Layer Figure 36. Internal Layer 1, GND Figure 37. Internal Layer 2, VDD Figure 38.
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LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 LM4670 WSON BOARD ARTWORK Figure 39. Composite View Figure 40. Silk Screen Figure 41. Top Layer Figure 42. Internal Layer 1, GND Figure 43. Internal Layer 2, VDD Figure 44. Bottom Layer Revision History Rev Date Description 1.0 12/15/04 Initial WEB of the D/S (TL pkg). 1.1 7/06/05 Re-released D/S to the WEB (added the SD package). 1.2 7/13/06 Edited Note 9, then re-released D/S to the WEB.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 26-Aug-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ LM4670ITL/NOPB DSBGA LM4670ITLX/NOPB LM4670SD/NOPB Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) YZR 9 250 178.0 DSBGA YZR 9 3000 WSON NGQ 8 1000 B0 (mm) K0 (mm) P1 (mm) 8.4 1.57 1.57 0.76 4.0 178.0 8.4 1.57 1.57 0.76 178.0 12.4 3.3 3.3 1.0 Pack Materials-Page 1 W Pin1 (mm) Quadrant 8.0 Q1 4.0 8.0 Q1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4670ITL/NOPB DSBGA YZR 9 250 210.0 185.0 35.0 LM4670ITLX/NOPB DSBGA YZR 9 3000 210.0 185.0 35.0 LM4670SD/NOPB WSON NGQ 8 1000 210.0 185.0 35.
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MECHANICAL DATA NGQ0008A SDA08A (Rev A) www.ti.
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MECHANICAL DATA YZR0009xxx D 0.600±0.075 E TLA09XXX (Rev C) D: Max = 1.514 mm, Min =1.454 mm E: Max = 1.489 mm, Min =1.428 mm 4215046/A NOTES: A. All linear dimensions are in millimeters. Dimensioning and tolerancing per ASME Y14.5M-1994. B. This drawing is subject to change without notice. www.ti.
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