LM48510_14 Datasheet, PDF (1/30 Pages) Texas Instruments – Boosted Class D Audio Power Amplifier

LM48510
www.ti.com
SNAS275D – NOVEMBER 2006 – REVISED OCTOBER 2007
LM48510
Boosted Class D Audio Power Amplifier
Check for Samples: LM48510
FEATURES
1
•2 Click and Pop Suppression
• Low 0.01μA Shutdown Current
• 76% Efficiency
• Filterless Class D
• 2.7V - 5.0V operation (V_DD)
• Externally configurable gain on Class D
• Very fast turn on time: 17μs
• Independent Boost and Amplifier shutdown
pins
APPLICATIONS
• Mobile Phones
• PDAs
• Portable media
• Cameras
• Handheld games
DESCRIPTION
The LM48510 integrates a boost converter with a high efficiency mono, Class D audio power amplifier to provide
1.2W continuous power into an 8Ω speaker when operating on a 3.3V power supply with boost voltage (PV₁) of
5.0V. When operating on a 3.3V power supply, the LM48510 is capable of driving a 4Ω speaker load at a
continuous average output of 1.7W with less than 1% THD+N. The Class D amplifier is a low noise, filterless
PWM architecture that eliminates the output filter, reducing external component count, board area consumption,
system cost, and simplifying design.
The LM48510's switching regulator is a current-mode boost converter operating at a fixed frequency of 0.6MHz.
The LM48510 is designed for use in mobile phones and other portable communication devices. The high (76%)
efficiency extends battery life when compared to Boosted Class AB amplifiers. The LM48510 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 Class D is externally configurable which allows independent gain control from multiple sources by
summing the signals. Output short circuit and Thermal shutdown protection prevent the device from damage
during fault conditions. Superior click and pop suppression eliminates audible transients during power-up and
shutdown.
■ Quiescent Power Supply Current
■ Output Power
(R_L = 8Ω, THD+N ≤ 1%,
V_DD = 3.3V, PV₁ = 5.0V)
■ Shutdown Current
Table 1. Key Specifications
VALUE
6mA (typ)
1.2
0.01μA (typ)
UNIT
W (typ)
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
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.
Copyright © 2006–2007, Texas Instruments Incorporated