EEWORLDEEWORLDEEWORLD

Part Number

Search

MAX4978ETA

Description
Overvoltage Protector with Active Current Limit
File Size154KB,10 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Compare View All

MAX4978ETA Overview

Overvoltage Protector with Active Current Limit

19-4137; Rev 0; 5/08
Overvoltage Protector with
Active Current Limit
General Description
The MAX4978–MAX4981 overvoltage-protection devices
protect low-voltage systems against voltage faults up to
+28V and feature a low 85mΩ R
ON
FET, an active cur-
rent limiter, and lithium-ion battery overcharge protec-
tion (MAX4980/MAX4981). These devices are used to
protect the charger input port on a portable device.
The overvoltage protector feature protects against volt-
ages up to 28V with two different trip thresholds: 5.7V
(MAX4978/MAX4980/MAX4981) and 6.8V (MAX4979).
There is an undervoltage protector with two different trip
thresholds: 4.4V (MAX4978) and 2.63V (MAX4979/
MAX4980/MAX4981).
The overcurrent limiter and battery voltage monitor fea-
tures provide a second layer of protection for a lithium-
ion battery charger. The overcurrent limiter is available
in two different thresholds: 0.9A (MAX4978/MAX4979/
MAX4980) and 1.95A (MAX4981). Once current reach-
es the threshold, it is held for a 20ms blanking time. If
the current is still at the limit after the blanking time, the
FET is turned off, and the device restarts the cycle after
160ms. The battery voltage monitor measures the volt-
age of a lithium-ion battery and disables the FET if the
battery voltage reaches 4.4V (MAX4980/MAX4981).
The MAX4978–MAX4981 are available in a small 8-pin
TDFN (2mm x 3mm) package and are specified over
the extended -40°C to +85°C temperature range.
Features
Input Voltage Protection Up to +28V
Integrated nFET Switch, 85mΩ (typ)
Preset Overvoltage Protection Trip Level
5.7V (typ) (MAX4978/MAX4980/MAX4981)
6.8V (typ) (MAX4979)
Low-Current Undervoltage Lockout Mode
Overcurrent Protection
Internal 160ms (typ) Startup Delay
Thermal-Shutdown Protection
Battery Overcharge Protection
(MAX4980/MAX4981)
Startup Debounce Time Indicator
(MAX4978/MAX4979)
Small, 8-Pin (2mm x 3mm) TDFN Package
MAX4978–MAX4981
Pin Configuration
TOP VIEW
OUT
8
I.C.
7
I.C.
6
GND
5
Applications
Cell Phones
MP3 Players
Digital Still Cameras
PDAs and Palmtop
Devices
MAX4978
MAX4979
MAX4980
MAX4981
*EP
1
2
3
4
EN
IN SDT(BAT) I.C.
TDFN-EP
Typical Application Circuit appears at end of data sheet.
(BAT) IS FOR MAX4980/MAX4981 ONLY.
*EP = EXPOSED PAD. CONNECT EP TO GND.
Ordering Information/Selector Guide
PART
MAX4978ETA+
MAX4979ETA+**
MAX4980ETA+
MAX4981ETA+
PIN-PACKAGE
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
CURRENT
LIMIT (mA)
900
900
900
1950
BATTERY
MONITOR
No
No
Yes
Yes
UVLO
(V)
4.4
2.63
2.63
2.63
OVLO
(V)
5.7
6.8
5.7
5.7
TOP
MARK
AAK
AAL
AAM
AAN
PKG
CODE
T823-1
T823-1
T823-1
T823-1
Note:
All devices specified over the -40°C to +85°C operating temperature range.
+Denotes
a lead-free package.
*EP
= Exposed pad.
**Future
product—contact factory for availability.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

MAX4978ETA Related Products

MAX4978ETA MAX4978 MAX4979ETA MAX4980ETA MAX4981ETA
Description Overvoltage Protector with Active Current Limit Overvoltage Protector with Active Current Limit Overvoltage Protector with Active Current Limit Overvoltage Protector with Active Current Limit Overvoltage Protector with Active Current Limit
Google says flash memory is not as reliable as hard disks, Nimble says RAID 3P+ can handle it
As you all know, a few days ago, Google published a paper at USENIX FAST 2016, saying that in actual environments, the reliability of flash memory is actually not as good as that of hard disks.This ha...
白丁 FPGA/CPLD
Strong drought and violent laughter, personal signature
1. What should you do if you encounter a snake in the wild? Don't panic, hold up an umbrella with a warm smile, and pretend to be Xu Xian.   2. When taking an exam, prepare to write "Baidu, you will k...
hzcctv Talking
H.264 official Chinese documentation! ~
Needless to say, those who make videos should know! ~...
wanghongyang Embedded System
Suggestions on TaoETao
I browsed the TaoETao section for a few hours this afternoon. I originally wanted to find some cheap boards to play with, but I found many problems in the process of searching. First of all, some post...
wateras1 Suggestions & Announcements
I want the corresponding model of the chip silk screen of S0T-23-5 package, thank you
Appearance, as shown; Silkscreen AABH Help: Is there a table of corresponding models of such chips with silkscreen? Similar to the table of corresponding models of SMD transistors with silkscreen? Tha...
yshmily Analog electronics
Review summary: Free review - Topmicro smart display module
Activity details: [Free evaluation - Topmicro intelligent display module]Updated to 2021-12-05Evaluation report summary:@Yang Zuoshi[Top Micro Intelligent Display Module] Project Post: Developing Medi...
EEWORLD社区 Special Edition for Assessment Centres

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 1542  2162  1616  2317  85  32  44  33  47  2 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号