آی سی شارژ باتری لیتیوم یون MAX745EAP برای کنترل شارژ پک های
باتری لیتیوم یون و قابلیت شارژ تا 4 آمپر بدون داغ شدن و با دقت رگولاسیون
±0.75% خطا در ترمینال های ورودی را دارد.
این آی سی کنترل شارژ با مقاومت های ارزان 1 درصد برای تنظیم ولتاژ خروجی و سوئیچ ماسفت کانال N برای سوئیچ پاور ساخته شده است و به کمک دو لوپ برای انتقال ولتاژ و جریان به طور همزمان استفاده می کند تا جریان و ولتاژ رگوله شده را به نقطه معین برساند.
Description:
The MAX745 provides all functions necessary for charging lithium-ion battery packs. It provides a regulated charging current of up to 4A without getting hot, and a regulated voltage with only ±0.75% total error at the battery terminals. It uses low-cost, 1% resistors to set the output voltage, and a low-cost N-channel MOSFET as the power switch.
The MAX745 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. The per-cell battery voltage regulation limit is set between 4V and 4.4V using standard 1% resistors, and then the number of cells is set from 1 to 4 by pin-strapping.
For a similar device with an SMBus™ microcontroller interface and the ability to charge NiCd and NiMH cells, refer to the MAX1647 and MAX1648. For a low-cost Li+ charger using a linear-regulator control scheme, refer to the MAX846A.
Application:
Li+ Battery Packs
Desktop Cradle Chargers
Cellular Phones
Notebook Computers
Hand-Held Instruments
Features:
Charges 1 to 4 Lithium-Ion Battery Cells
±0.75% Voltage-Regulation Accuracy Using 1% Resistors
Provides up to 4A without Excessive Heating
90% Efficient
Uses Low-Cost Set Resistors and N-Channel Switch
Up to 24V Input
Up to 18V Maximum Battery Voltage
300kHz PWM Operation: Low-Noise, Small Components
Stand-Alone Operation; No Microcontroller Needed