|
Details, datasheet, quote on part number:LM4850
| |
| Part: | LM4850 |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers => Boomer Audio Power Amplifiers |
| Description: | LM4850 - Mono 1.5 W / Stereo 300 MW Power Amplifier, Package: Llp, Pin Nb=14 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4850 datasheet File size : 1140 kB |
| Request For quote: | Find where to buy LM4850
|
| |
Datasheet text preview:
LM4850 Mono 1.5 W / Stereo 300 mW Power Amplifier
July 2002
LM4850 Mono 1.5 W / Stereo 300 mW Power Amplifier
General Description
The LM4850 is an audio power amplifier capable of delivering 1.5W (typ) of continuous average power into a mono 4 bridged-tied load (BTL) with 1% THD+N or 95mW per channel of continuous average power into stereo 32 single-ended (SE) loads with 1% THD+N, using a 5V power supply. The LM4850 can automatically switch between mono BTL and stereo SE modes utilizing a headphone sense pin. It is ideal for any system that provides both a monaural speaker output and a stereo line or headphone output Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4850 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4850 features an externally controlled, micropower consumption shutdown mode and thermal shutdown protection. The unity-gain stable LM4850's gain is set by external gain-setting resistors
Note 1: An LM4850LD that has been properly mounted to a circuit board will deliver 1.9W into 3 (at 1% THD+N). The other package options for the LM4850 will deliver 1.1W into 8 (at 1% THD+N). See Application Information sections for further information concerning the LM4850LD, LM4850MM, and LM4850MT.
Key Specifications
n n n n n n n n n n Output Power at 1% THD+N, 1kHz: LM4850LD 3 BTL LM4850LD 4 BTL LM4850MM, MT 4 BTL LM4850LD, MM, MT 8 BTL LM4850LD, MM, MT 8 SE LM4850LD, MM, MT 32 SE THD+N at 1kHz, 95mW into 32 SE Single Supply Operation Shutdown Current 1.9W (typ) 1.7W (typ) 1.5W (typ) 1.1W (typ) 300mW (typ) 95mW (typ) 1% (typ) 2.4 to 5.5V 44µA (typ)
Features
n n n n n n n Mono 1.5W BTL or stereo 300mW output Headphone sense "Click and pop" suppression circuitry No bootstrap capacitors required Thermal shutdown protection Unity-gain stable LLP, TSSOP, and MSOP packaging
Applications
n n n n Portable computers Desktop computers PDA's Handheld games
Typical Application
20001031
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation
DS200010
www.national.com
LM4850
Connection Diagrams
20001051
Top View 10 Lead MSOP Order Number LM4850MM See NS Package Number MUB10A
20001052
Top View 14 Lead TSSOP Order Number LM4850MT See NS Package Number MTC14
20001002
Top View 14 Lead LLP Order Number LM4850LD See NS Package Number LDA14A
www.national.com
2
LM4850
Absolute Maximum Ratings
(Note 3)
JA (typ) -- MUB10A JC (typ) -- MUB10A JA (typ) -- MTC14 JC (typ) -- MTC14 JA (typ) -- LDA14A (Note 10) JC (typ) -- LDA14A
194°C/W 52°C/W 150°C/W 40°C/W 56°C/W 4.3°C/W
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature ESD Susceptibility (Note 5) ESD Machine model (Note 8) Junction Temperature (TJ) Solder Information (Note 2) Small Outline Package Vapor Phase (60 sec.) Infrared (15 sec.) Thermal Resistance 215°C 220°C 6.0V -65°C to +150°C 3.5kV 250V 150°C
Operating Ratings (Note 3)
Temperature Range -40°C to 85°C Supply Voltage VDD 2.4V VDD 5.5V
Note 2: See AN-450 'Surface Mounting and their effects on Product Reliability' for other methods of soldering surface mount devices.
Electrical Characteristics (Notes 3, 9)
The following specifications apply for VDD = 5.0V, TA = 25°C unless otherwise specified. Symbol Parameter Conditions LM4850 Typical (Note 6) VDD IDD ISD VOS PO Supply Voltage Supply Current Shutdown Current Output Offset Voltage Output Power BTL Mode; VIN = 0V; IO = 0A SE Mode; VIN = 0V; IO = 0A SD Mode BTL Mode; AV = 2 BTL OUT+ to BTL OUT- LM4850LD; BTL Mode; RL = 3 THD+N = 1% (Note 11) LM4850LD; BTL Mode; RL = 4 THD+N = 1% (Note 11) LM4850MT, MM; BTL Mode; RL = 4 THD+N = 1% BTL Mode; RL = 8 THD+N = 1% SE Mode; RL = 8 THD+N = 1% SE Mode; RL = 32 THD+N = 1% VIH VIL Shutdown Input Voltage High Shutdown Input Voltage Low Is 0.5mA SE Mode, RL = 32; f = 1kHz 73 2.4 2.4 44 5.0 1.9 1.7 1.5 1.1 300 95 2.0 0.8 40 Limit (Note 7) 2.4 5.5 7.0 7.0 Units (Limits)
V (min) V (max) mA mA µA mV W W W W mW mW V (min) V (max) dB
Crosstalk Channel Seperation
Electrical Characteristics (Notes 3, 9)
The following specifications apply for VDD = 3.3V, TA = 25°C unless otherwise specified. Symbol Parameter Conditions LM4850 Typical (Note 6) IDD Supply Current BTL Mode; VIN = 0V; IO = 0A
3
Limit (Note 7)
Units (Limits)
2.0
mA
www.national.com
|
|
