Features: Available in space-saving packages: micro SMD, MSOP SOIC, and LLP
Ultra low current shutdown mode
BTL output can drive capacitive loads
Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions
2.2 to 5.5V operation
No output coupling capacitors, snubber networks or bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
External gain configuration capabilityApplication Mobile Phones
PDAs
Portable electronic devicesPinout
Specifications
| Power@ 8Ohms, 1% THD |
0.9 Watt |
| Power@ 8Ohms, 10% THD |
1.1 Watt |
| THD |
0.1 % |
| PSRR |
66 dB |
| Channels |
1 Channels |
| Supply Range |
+2.2 - +5.5 V |
| THD Conditions |
Po = 0.4Vrms, f=1kHz |
| PSRR Conditions |
Vripple = 0.2V sine p-p, f = 1kHz |
| User Supply |
5 Volt |
| Shutdown Type |
High |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| View Using Catalog |
Supply Voltage (Note 11) 6.0V
Storage Temperature−65˚C to +150˚C
Input Voltage −0.3V to VDD +0.3V
Power Dissipation (Note 3) Internally Limited
ESD Susceptibility (Note 4) 2000V
ESD Susceptibility (Note 5) 250V
Junction Temperature 150˚C
Thermal Resistance
JC (SOP) 35˚C/W
JA (SOP) 150˚C/W
JA (micro SMD) 220˚C/W
JC (MSOP)56˚C/W
JA (MSOP) 190˚C/W
JA (LLP) 220˚C/WDescriptionThe LM4891 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8 BTL load with less than 1% distortion (THD+N) from a 5VDC power supply.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4891 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.
The LM4891 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic high. Additionally, the LM4891 features an internal thermal shutdown protection mechanism.
The LM4891 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions.
The LM4891 is unity-gain stable and can be configured by external gain-setting resistors.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM4891ITP |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4891ITPX |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4891M |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4891MX |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
The LM4891 is an audio power amplifier primarily designed for demanding applications in mobile phones and other por-table communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4891 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage appli-cations where minimal power consumption is a primary re-quirement.
The LM4891 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic high. Additionally, the LM4891 features an internal ther-mal shutdown protection mechanism.
The LM4891 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions.
The LM4891 is unity-gain stable and can be configured by external gain-setting resistors.
LM4891 Data Sheet
