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LM2770SD-12157 from NS,NS,National Semiconductor

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LM2770SD-12157

Manufacturer: NS,NS, NATIONAL

High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode
Partnumber Manufacturer Quantity Availability
LM2770SD-12157,LM2770SD12157 NS,NS, NATIONAL 7413 In Stock

Description and Introduction

High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode The LM2770SD-12157 is a switched capacitor voltage inverter manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Input Voltage Range:** 2.7V to 5.5V  
- **Output Voltage:** -Vin (inverted input voltage)  
- **Output Current:** Up to 250mA  
- **Switching Frequency:** 1.5MHz (typical)  
- **Efficiency:** Up to 96%  
- **Package:** WSON-8 (3mm x 3mm)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions and Features:**  
- The LM2770SD-12157 is a high-efficiency switched capacitor voltage inverter that generates a negative output voltage from a positive input supply.  
- It uses a 1.5MHz switching frequency to minimize external component size.  
- Features low output impedance and high efficiency, making it suitable for portable and battery-powered applications.  
- Includes built-in soft-start to limit inrush current.  
- Requires only two small external flying capacitors for operation.  
- Provides a regulated inverted output voltage with minimal ripple.  

This device is commonly used in applications such as LCD bias, audio amplifiers, and other circuits requiring a negative voltage rail.

Application Scenarios & Design Considerations

High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode

Alternative Part Number

  • TPS62203DBVR --: Pin-compatible step-down converter in SOT-23-5 with similar input range and current capability; TI is the direct successor to National Semiconductor parts.
  • AP3211KTR-G1 --: Compact synchronous buck converter with comparable voltage and current ratings, suitable drop-in replacement for small portable power designs.
  • MP2359DJ-LF-Z --: Wide-input step-down converter in SOT-23 package offering similar output current and efficiency, widely available alternative.
  • TPS62290DRVR --: Pin-compatible step-down converter in the same WSON package family, widely available and a common drop-in replacement for National LM2770 designs.
  • RT8059GJ5 --: Compact step-down DC-DC converter with matching voltage range and load capability, offering a cost-effective alternative from a different series.

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