Features: · Fully differential amplification
· Available in space-saving packages micro SMD, MSOP,and LLP
· Ultra low current shutdown mode
· Can drive capacitive loads up to 500pF
· Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions
· 2.4 - 5.5V operation
· No output coupling capacitors, snubber networks or bootstrap capacitors required
· Shutdown high or low selectivityApplication· Mobile phones
· PDAs
· Portable electronic devicesPinout
Specifications
| Power@ 4Ohms, 1% THD |
1.4 Watt |
| Power@ 8Ohms, 1% THD |
1 Watt |
| Power@ 4Ohms, 10% THD |
2 Watt |
| Power@ 8Ohms, 10% THD |
1.3 Watt |
| THD |
0.05 % |
| PSRR |
90 dB |
| CMRR |
50 dB |
| Channels |
1 Channels |
| Supply Range |
+2.4 - +5.5 V |
| THD Conditions |
Po=0.4Wrms, f=1kHz |
| PSRR Conditions |
Vripple=0.2V sine p-p, f=1kHz |
| User Supply |
5 Volt |
| Shutdown Type |
High/Low Selectable |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| View Using Catalog |
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
Supply Voltage................................................ 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) ............................200V
Junction Temperature.................................. 150°C
Thermal Resistance
JC (LLP)................................................... 12°C/W
JA (LLP)................................................... 63°C/W
JA (micro SMD)...................................... 220°C/W
JC (MSOP)............................................... 56°C/W
JA (MSOP)............................................. 190°C/W
Soldering Information
See AN-1112 "microSMD Wafers Level Chip Scale Package."DescriptionThe LM4898 is a fully differential 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 LM4898 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 LM4898 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown select pin to be driven in a likewise manner to enable Shutdown. Additionally, the LM4898 features an internal thermal shutdown protection mechanism.
The LM4898 contains advanced pop & click circuitry which virtually eliminates noises which would otherwise occur during turn-on and turn-off transitions.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM4898ITL |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4898ITLX |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4898LD |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4898LDX |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4898MM |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM4898MMX |
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.
LM4898 Data Sheet
