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MAX1870AETJ+ from MAXIM,MAXIM - Dallas Semiconductor

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MAX1870AETJ+

Manufacturer: MAXIM, MAIXM

Step-Up/Step-Down Li+ Battery Charger

Partnumber Manufacturer Quantity Availability
MAX1870AETJ+,MAX1870AETJ MAXIM, MAIXM 4000 In Stock

Description and Introduction

Step-Up/Step-Down Li+ Battery Charger The MAX1870AETJ+ is a high-efficiency, step-down DC-DC converter manufactured by **MAXIM Integrated** (now part of Analog Devices).  

### **Specifications:**  
- **Input Voltage Range:** 2.6V to 5.5V  
- **Output Voltage Range:** Adjustable from 0.8V to VIN  
- **Output Current:** Up to 600mA  
- **Switching Frequency:** 1MHz (fixed)  
- **Efficiency:** Up to 95%  
- **Package:** 32-Pin TQFN (5mm x 5mm)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Features:**  
  - Low dropout operation  
  - Internal synchronous rectifier  
  - Soft-start capability  
  - Overcurrent and thermal protection  
  - Power-good output  

### **Descriptions and Features:**  
The MAX1870AETJ+ is a synchronous step-down DC-DC converter optimized for high efficiency and compact power solutions. It integrates a power MOSFET switch and synchronous rectifier, reducing external component count. The device operates at a fixed 1MHz switching frequency, allowing the use of small inductors and capacitors.  

Key features include:  
- **Adjustable Output Voltage** (via external resistors)  
- **High Efficiency** (minimizes power loss)  
- **Low Dropout Operation** (extends battery life)  
- **Integrated Protection** (thermal shutdown, overcurrent protection)  
- **Small Footprint** (suitable for space-constrained applications)  

This converter is commonly used in portable electronics, battery-powered devices, and point-of-load (POL) power supplies.  

(Data sourced from MAXIM Integrated/Analog Devices product documentation.)

Application Scenarios & Design Considerations

Step-Up/Step-Down Li+ Battery Charger

Alternative Part Number

  • BQ24725ARGRR --: Multi-cell battery charger controller with SMBus control, functionally similar to the MAX1870A in charger applications and widely available.
  • ISL88731CHRTZ --: SMBus battery charger controller for 2-4 cell packs, comparable feature set and pin-compatible class for laptop charger designs.
  • LTC4100EGN#PBF --: SMBus smart battery charger controller offering similar charging control functionality as a cross-vendor alternative.
  • BQ24780SRUYR --: Multi-chemistry battery charger controller with SMBus control, functionally similar to the MAX1870A for notebook charging applications and widely available.
  • LTC4162IUFD --: Advanced multi-chemistry buck battery charger with I2C control, suitable as a higher-integration alternative when the MAX1870A is unavailable.

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