| Overview
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| Diagrams
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| Parametrics
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| Documents
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| Order
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| Boards
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| Packaging
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Features
| • | Integrated Charge Pump |
| • | Bridge-tied Load Output |
| • | Differential Input |
| • | High PSRR |
| • | I
2C Volume and Mode Control
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| • | Reset Input |
| • | Advanced Click-and-Pop Suppression |
| • | Low Supply Current |
| • | Minimum external components |
| • | Micro-power shutdown |
| • | Available in space-saving 16-bump micro SMD package |
Description The LM48557 is a single supply, mono, ceramic speaker driver with an integrated charge-pump, designed for portable devices,
such as cell phones and portable media players, where board space is at a premium. The LM48557 charge pump allows the device
to deliver 5.8VRMS from a single 4.2V supply.
The LM48557 features high power supply rejection ratio (PSRR), 80dB at 217Hz, allowing the device to operate in noisy environments
without additional power supply conditioning. Flexible power supply requirements allow operation from 2.7V to 4.5V. The
LM48557 features an active low reset input that reverts the device to its default state. Additionally, the LM48557 features
a 36-step I
2C volume control and mute function. The low power Shutdown mode reduces supply current consumption to 0.01µA.
The LM48557’s superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The
LM48557 is available in an ultra-small 16-bump micro SMD package (1.965mmx1.965mm).
Key Specification
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Output Voltage at VDD = 4.2V
RL = 1µF +22Ω, THD+N
≤ 1%
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5.8VRMS (typ)
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Quiescent Power Supply Current
at 4.2V
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5mA (typ)
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PSRR at 217Hz
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80dB (typ)
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Shutdown current
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0.01μA (typ)
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Applications
| • | Mobile phones |
| • | PDAs |
| • | Notebook Electronic Devices |
| • | MP3 Players |
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| Parameters | Values |
|---|
| Load Conditions |
RL = 1μF + 22Ω |
| Supply Min |
1.7 Volt |
| Supply Max |
4.5 Volt |
| THD |
0.05 % |
| THD Conditions |
VO = 4VRMS, f = 1kHz, AV = 48dB |
| Shutdown Type |
Low |
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Datasheet
Featured Application Notes
More Application Notes
Part Number(s)
(NSID) | Top View | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
|---|
LM48557TL/NOPB
RoHS | | Full production
Lead Time: 12 weeks
 | | Distributor | Region | Qty |
|---|
| DIGIKEY |  | Worldwide | 488 |
| $1.05 each at 1K+ pcs | reel
of
250 |
LM48557TLX/NOPB
RoHS | | Full production
Lead Time: 12 weeks
| | Distributor | Region | Qty |
|---|
| DIGIKEY | | Worldwide | 0 |
| $1.05 each at 1K+ pcs | reel
of
3000 |
Part Number(s)
(NSID) | Description | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
|---|
LM48557TLEVAL
| LM48557TLEVAL Demo Board | Full production
|
| CALL | N/A |
 Description:
The LM48557 is a single supply, mono, ceramic speaker driver with an integrated charge-pump, designed for portable devices, such as cell phones and portable media players, where board space is at a premium. The LM48557 charge pump allows the device to deliver 5.8VRMS from a single 4.2V supply.
The LM48557 features high power supply rejection ratio (PSRR), 80dB at 217Hz, allowing the device to operate in noisy environments without additional power supply conditioning. Flexible power supply requirements allow operation from 2.7V to 4.5V. The LM48557 features an active low reset input that reverts the device to its default state. Additionally, the LM48557 features a 36-step I2C volume control and mute function. The low power Shutdown mode reduces supply current consumption to 0.01?
This LM48557TLEVAL is an evaluation kit designed to ease the evaluation effort during the development of a circuit using the LM48557TLEVAL. Instructions to use the L48557TLEVAL demo board are contained in the LM48557 Data Sheet.
Features:
- Integrated Charge Pump
- Bridge-tied Load Output
- Differential Input
- High PSRR
- I2C Volume and Mode Control
- Reset Input
- Advanced Click-and-Pop Suppression
- Low Supply Current
- Minimum external components
- Micro-power shutdown
- Available in space-saving 16-bump ?D package
Applications:
- Mobile Phones and Multimedia Terminals
- Smart Phones
- PDAs, Internet Appliances and Portable Gaming
- Portable DVD Players
- Digital Still Cameras/Camcorders
- Portable Notebooks, Laptops
Contents:
- A fully assembled Audio Power Amplifier evaluation board
- A fully assembled USB I2C daughter card
- 1 USB I2C Cable
The user interface software can be found on the Digital Audio Evaluation Boards support page |
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