| Part Number(s) (NSID) |
Top View | Type | Pins | MSL Rating | Peak Reflow | RoHS Status |
CAD Symbols | Models | Package Marking Format |
|---|---|---|---|---|---|---|---|---|---|
| LM2831XMF/NOPB LM2831XMF |
 |
SOT-23 | 5 | 1 1 |
260 260 |
Detail | Download | N/A |
SKYB XTT |
| LM2831XMFX/NOPB LM2831XMFX |
|
SOT-23 | 5 | 1 1 |
260 260 |
Detail | Download | N/A |
SKYB XTT |
| LM2831XSD/NOPB LM2831XSD |
 |
LLP | 6 | 3 3 |
260 260 |
Detail | Download | N/A |
ZXYTT L193B |
| LM2831XSDX/NOPB LM2831XSDX |
|
LLP | 6 | 3 3 |
260 260 |
Detail | Download | N/A |
ZXYTT L193B |
| LM2831YMF/NOPB LM2831YMF |
|
SOT-23 | 5 | 1 1 |
260 260 |
Detail | Download | N/A |
SKZB XTT |
| LM2831YMFX/NOPB LM2831YMFX |
|
SOT-23 | 5 | 1 1 |
260 260 |
Detail | Download | N/A |
SKZB XTT |
| LM2831YSD/NOPB LM2831YSD |
|
LLP | 6 | 3 3 |
260 260 |
Detail | Download | N/A |
ZXYTT L194B |
| LM2831YSDX/NOPB LM2831YSDX |
|
LLP | 6 | 3 3 |
260 260 |
Detail | Download | N/A |
ZXYTT L194B |
| LM2831ZMF/NOPB LM2831ZMF |
|
SOT-23 | 5 | 1 1 |
260 260 |
Detail | Download | N/A |
SLAB XTT |
| LM2831ZMFX/NOPB LM2831ZMFX |
|
SOT-23 | 5 | 1 1 |
260 260 |
Detail | Download | N/A |
SLAB XTT |
| LM2831ZSD/NOPB LM2831ZSD |
|
LLP | 6 | 3 3 |
260 260 |
Detail | Download | N/A |
ZXYTT L195B |
| LM2831ZSDX/NOPB LM2831ZSDX |
|
LLP | 6 | 3 3 |
260 260 |
Detail | Download | N/A |
ZXYTT L195B |
PDF
Description
The LM2831 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 5 pin SOT23 and a 6 Pin LLP package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5A loads with an internal 130 m
PMOS switch using state-of-the-art 0.5 µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire 3V to 5.5V input operating range down to the minimum output voltage of 0.6V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3.0 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30 nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection.
| • | Local 5V to Vcore Step-Down Converters |
| • | Core Power in HDDs |
| • | Set-Top Boxes |
| • | USB Powered Devices |
| • | DSL Modems |
| • | Space Saving SOT23-5 Package |
| • | Input voltage range of 3.0V to 5.5V |
| • | Output voltage range of 0.6V to 4.5V |
| • | 1.5A output current |
| • | High Switching Frequencies 1.6MHz (LM2831X) 0.55MHz (LM2831Y) 3.0MHz (LM2831Z) |
| • | 130m PMOS switch |
| • | 0.6V, 2% Internal Voltage Reference |
| • | Internal soft-start |
| • | Current mode, PWM operation |
| • | Thermal Shutdown |
| • | Over voltage protection |
Diagrams
Typical Application
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Block Diagram
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Typical Performance 
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