LM48820 Texas instruments

LM48820

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LM48820

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Описание

The LM48820 is a ground referenced, fixed-gain audio power amplifier capable of delivering 95mW of continuous average power into a 16Ω single-ended load, with less than 1% THD+N from a 3V power supply. The LM48820 features a new circuit technology that utilizes a charge pump to generate a negative reference voltage. This allows the outputs to be biased about ground, thereby eliminating output-coupling capacitors typically used with normal single-ended loads. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external components. The LM48820 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other portable applications. The LM48820 features a low-power consumption shutdown mode selectable for each channel and a soft start function that reduces start-up current transients. Additionally, the LM48820 features an internal thermal shutdown protection mechanism. The LM48820 contains advanced pop and click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM48820 has an internal fixed gain of 1.5V/V.

Available in Space Saving 0.4mm Pitch DSBGA Package
Fixed Logic Levels
Ground Referenced Outputs
High PSRR
Ultra Low Current Shutdown Mode
Improved Pop and Click Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions
No Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors, or Gain-Setting Resistors Required
Shutdown Either Channel Independently
Soft Start Feature Reduces Start up Transient Current

Key Specifications

Improved PSRR at 217Hz: 80dB (typ)
Power Output at VDD = 3V, RL = 16Ω, THD+N = 1%: 95mW (typ)
Shutdown Current: 0.05μA (typ)
Internal Fixed Gain: 1.5V/V (typ)
Wide Operating Voltage Range: 1.6V to 4.5V

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Output power (W)	0.095
Analog supply (min) (V)	1.6
Analog supply (max) (V)	4.5
Load (min) (Ω)	16
PSRR (dB)	80
Rating	Catalog
Operating temperature range (°C)	-40 to 85
Headphone channels	Stereo
Volume control	No
Shutdown current (ISD) (µA)	0.05
Architecture	Class-AB (ground-centered)
Iq per channel (typ) (mA)	2.3