LM48520TLSLASHNOPB中文资料德州仪器数据手册PDF规格书

FEATURES

• Click and Pop Suppression

• Low 0.04μA Shutdown Current

• 78% Efficiency

• Filterless Class D

• 2.7V - 5.0V Operation

• 4 Adjustable Gain Settings

• Adjustable Output Swing Limiter with Soft

Clipping

• Speaker Protection

• Short Circuit Protection on Audio Amps

• Independent Boost and Amplifier Shutdown

APPLICATIONS

• Mobile Phones

• PDAs

• Portable media

• Cameras

• Handheld games

KEY SPECIFICATIONS

• Quiescent Power Supply Current: 11.5 mA(typ)

• Output Power (RL = 8Ω, THD+N ≤ 1%,

VDD = 3.3V,PV1 = 5.0V): 1.1 W(typ)

• Shutdown Current: 0.04 μA(typ)

DESCRIPTION

The LM48520 integrates a boost converter with a

high efficiency Class D stereo audio power amplifier

to provide up to 1W/ch continuous power into an 8Ω

speaker when operating from 2.7V to 5.0V power

supply with boost voltage (PV1) of 5.0V. The

LM48520 utilizes a proprietary spread spectrum pulse width modulation technique that lowers RF

interference and EMI levels. The Class D amplifier is

a low noise, filterless PWM architecture that

eliminates the output filter, reducing external

component count, board area, power consumption, system cost, and simplifying design.

The LM48520 is designed for use in mobile phones

and other portable communication devices. The high

(78%) efficiency extends battery life when compared

to Boosted Class AB amplifiers. The LM48520

features a low-power consumption shutdown mode.

Shutdown may be enabled by driving the Shutdown

pin to a logic low (GND). Also, external leakage is

minimized via control of the ground reference via the

SW-OUT pin .

The LM48520 has 4 gain options which are pin

selectable via Gain0 and Gain1 pins. Output short

circuit prevents the device from damage during fault

conditions. Superior click and pop suppression

eliminates audible transients during power-up and

shutdown.