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参数资料
| 型号： | MAX4981ETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/10页 |
| 文件大小： | 0K |
| 描述： | IC OVERVOLTAGE PROT CTRLR 8TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 过压保护控制器 |
| 输入电压： | 2.3 V ~ 28 V |
| 电流 - 电源： | 130µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
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 85m Ω 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
Features
? Input Voltage Protection Up to +28V
? Integrated nFET Switch, 85m Ω (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
Pin Configuration
the current is still at the limit after the blanking time, the
FET is turned off, and the device restarts the cycle after
TOP VIEW
OUT
8
I.C.
7
I.C.
6
GND
5
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.
Applications
MAX4978
MAX4979
MAX4980
MAX4981
Cell Phones
PDAs and Palmtop
*EP
MP3 Players
Devices
1
2
3
4
Digital Still Cameras
Typical Application Circuit appears at end of data sheet.
IN SDT(BAT) I.C.
TDFN-EP
(BAT) IS FOR MAX4980/MAX4981 ONLY.
*EP = EXPOSED PAD. CONNECT EP TO GND.
EN
Ordering Information/Selector Guide
PART
MAX4978 ETA+
MAX4979 ETA+**
MAX4980 ETA+
MAX4981 ETA+
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
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.
1
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