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MAX857CSA from MAXIM,MAXIM - Dallas Semiconductor

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MAX857CSA

Manufacturer: MAXIM

3.3V/5V or Adjustable-Output, Step-Up DC-DC Converters

Partnumber Manufacturer Quantity Availability
MAX857CSA MAXIM 4145 In Stock

Description and Introduction

3.3V/5V or Adjustable-Output, Step-Up DC-DC Converters The MAX857CSA is a step-up DC-DC converter manufactured by Maxim Integrated (now part of Analog Devices). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** Maxim Integrated  
- **Type:** Step-Up (Boost) DC-DC Converter  
- **Input Voltage Range:** 0.7V to 5.5V  
- **Output Voltage:** Adjustable (up to 5.5V) or fixed (3.3V or 5V)  
- **Output Current:** Up to 300mA (depending on input/output conditions)  
- **Switching Frequency:** 500kHz  
- **Efficiency:** Up to 94%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-pin SOIC  

### **Descriptions:**
The MAX857CSA is a low-power, step-up DC-DC converter designed for battery-powered applications. It provides a regulated output voltage from a low input voltage, making it suitable for single-cell or dual-cell battery systems. The device includes an internal N-channel MOSFET switch and requires minimal external components.

### **Features:**
- **Low Start-Up Voltage:** Operates down to 0.7V  
- **Adjustable or Fixed Output Voltage Options**  
- **Internal 0.5A Power Switch**  
- **Low Quiescent Current:** 25µA (typical)  
- **Pulse-Frequency Modulation (PFM) for High Efficiency at Light Loads**  
- **Undervoltage Lockout (UVLO) Protection**  
- **Thermal Shutdown Protection**  
- **Small Footprint with Minimal External Components**  

This information is based solely on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

3.3V/5V or Adjustable-Output, Step-Up DC-DC Converters

Alternative Part Number

  • LT1073CS8 --: Pin-compatible boost/inverting switching regulator with similar input range and current capability, widely used as a MAX857 substitute.
  • MC34063ACD --: Versatile DC-DC converter IC that can be configured for boost or inverting operation, low cost and readily available.
  • LM2577S-ADJ --: Adjustable boost regulator with comparable switching frequency and output capability, suitable for similar power supply designs.
  • LTC1174CS8 --: Pin-compatible step-up/inverting DC-DC converter in SO-8 with similar input range and switching topology; widely available and a common drop-in substitute.
  • LM2575S-ADJ --: Adjustable step-down/boost-capable switching regulator in a similar package family; suitable when higher current and a different control scheme are acceptable.

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