| Part Number(s) (NSID) |
Top View | Type | Pins | MSL Rating | Peak Reflow | RoHS Status |
CAD Symbols | Models | Package Marking Format |
|---|---|---|---|---|---|---|---|---|---|
| LM4670ITL/NOPB |
 |
MICRO SMD | 9 | 1 | 260 | Detail | Download | N/A |
XVG I E6 |
| LM4670ITLX/NOPB |
|
MICRO SMD | 9 | 1 | 260 | Detail | Download | N/A |
XVG I E6 |
| LM4670SD/NOPB LM4670SD |
 |
LLP | 8 | 1 1 |
260 260 |
Detail | Download | N/A |
ZXYTT L4670 |
| LM4670SDX/NOPB LM4670SDX |
|
LLP | 8 | 1 1 |
260 260 |
Detail | Download | N/A |
ZXYTT L4670 |
PDF
Description
The LM4670 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces external component count, simplifies circuit design, and reduces board area. The LM4670 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.
The LM4670 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4
speaker load at a continuous average output of 2.3W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V.
The LM4670 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8 speaker, the IC's efficiency for a 100mW power level is 77%, reaching 88% at 600mW output power.
The LM4670 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND).
The gain of the LM4670 is externally configurable which allows independent gain control from multiple sources by summing the signals.
| Efficiency at 3.6V, 100mW into 8 speaker |
77% (typ) |
| Efficiency at 3.6V, 600mW into 8 speaker |
88% (typ) |
| Efficiency at 5V, 1W into 8 speaker |
87% (typ) |
| Quiescent current, 3.6V supply | 4.8mA (typ) |
| Total shutdown power supply current | 0.01µA (typ) |
| Single supply range | 2.4V to 5.5V |
| • | Mobile phones |
| • | PDAs |
| • | Portable electronic devices |
| • | No output filter required for inductive loads |
| • | Externally configurable gain |
| • | Very fast turn on time: 1.35ms (typ) |
| • | Minimum external components |
| • | "Click and pop" suppression circuitry |
| • | Micro-power shutdown mode |
| • | Short circuit protection |
| • | Available in space-saving microSMD and LLP packages |
Diagrams
Typical Application
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Connection Diagram
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Typical Performance 
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