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参数资料
| 型号： | MAX4893BETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC CTLR OVP CURR LIMIT 10-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 过压保护控制器 |
| 应用： | 手机，数码相机，媒体播放器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Detailed Description
The MAX4881–MAX4884/MAX4893B provide up to
+28V overvoltage protection for low-voltage systems.
When the input voltage at IN exceeds the overvoltage
trip level (OVLO), the MAX4881–MAX4884/MAX4893B
turn off the low-cost external n-channel FET to prevent
damage to the protected components and issue an
overvoltage fault flag.
The MAX4881–MAX4884 feature a built-in current-limited
switch that limits the load current to 1.1A (MAX4881/
MAX4882), 0.7A (MAX4883B/MAX4883C/MAX4884B/
MAX4884C), and 0.9A (MAX4893B). When the load cur-
rent is at the current limit for longer than the blanking
time, the switch of the MAX4881/MAX4882/MAX4883B/
MAX4884B/MAX4893B latches off and does not turn
back on until EN or CB or IN is cycled. A current-limit flag
(FLAGI) asserts to indicate a current fault condition. The
MAX4883C/MAX4884C limit the current to 0.7A indefinite-
ly until the thermal protection trips. An overcurrent flag
output asserts to indicate a current fault condition after
the blanking time has elapsed.
IN-Undervoltage Lockout (UVLO)
The MAX4881/MAX4883/MAX4893B have a fixed 4.35V
undervoltage lockout level (UVLO) while the
MAX4882/MAX4884 have a fixed UVLO of 2.55V. GATE
goes low when VIN is below VUVLO, turning off the
external n-channel FET.
IN-Overvoltage Lockout (OVLO)
The MAX4881/MAX4883/MAX4893B have a fixed 5.6V
overvoltage threshold (OVLO), while the MAX4882/
MAX4884 have a fixed OVLO of 4.5V. GATE goes low
when VIN is higher than VOVLO, turning off the external
n-channel FET.
Fault Flag Output (
OV)
The OV output signals the host system that there is a fault
with the input voltage. OV asserts low in response to
either an overvoltage or undervoltage fault. OV stays low
for 50ms after GATE turns on, before deasserting high.
OV is an open-drain active-low output. Connect a
pullup resistor from OV to the logic I/O voltage of the
host system or to any voltage source up to 6V. Driving
EN high disables OV.
MAX4881–MAX4884/MAX4893B
Overvoltage Protection Controllers with
Current Limit in TDFN
_______________________________________________________________________________________
7
VIN
1.2V
VGATE
VUVLO
0.3V
tSTART
2.4V
t0V-BLANK
8V
tGON
VOV
5V
Figure 1. Startup Timing Diagram
VIN
VGATE
VOVLO
0.3V
tGOFF
0.4V
tOV
4V/5V
7V/8V
VOV
Figure 2. Shutdown Timing Diagram
VIN
IGATE
VOVLO
80%
tOVP
0V
Figure 3. Power-Up Overvoltage Timing Diagram
VGATE
0.3V
tDIS
2.4V
VEN
Figure 4. Disable Timing Diagram
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