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參數(shù)資料
| 型號： | MAX4893BETB+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTLR OVP CURR LIMIT 10-TDFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 過壓保護控制器 |
| 應(yīng)用： | 手機，數(shù)碼相機，媒體播放器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-TDFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
resets if the overcurrent condition disappears before
tBLANK has elapsed. The internal switch is latched off if
the overcurrent condition continues up to the end of the
blanking
time
(MAX4881/MAX4882/MAX4883B/
MAX4884B/MAX4893B). The MAX4883C/MAX4884C limit
the current infinitely until the thermal trip point occurs.
Reset the switch by toggling EN or CB or IN (Figure 6).
EN Input
The MAX4881–MAX4884/MAX4893B feature an active-
low enable input (EN). Drive EN low or connect to
ground for normal operation. Drive EN high to force the
external n-channel MOSFET off, and to disable OV and
FLAGI.
GATE Driver
An on-chip charge pump drives the GATE voltage to
about twice above VIN, allowing the use of a low-cost
n-channel MOSFET (Figure 7). The actual GATE output
voltage tracks approximately 2 x VIN until VIN exceeds
the OVLO trip level, 5.6V (MAX4881/MAX4883/
MAX4893B) and 4.5V (MAX4882/MAX4884) typically.
The GATE output voltage, as a function of input volt-
age, is shown in the Typical Operating Characteristics.
Applications Information
MOSFET Selection
The MAX4881–MAX4884/MAX4893B are designed for
use with an n-channel MOSFET. MOSFETs with RDS(ON),
specified for a VGS of 4.5V or less, work well. If the input
supply is near the UVLO minimum of 4.2V (MAX4881/
MAX4883/MAX4893B), or of 2.4V (MAX4882/ MAX4884),
consider using a MOSFET specified for a lower VGS volt-
age. Also, the VDS should be 30V for the MOSFET to
withstand the full 28V IN range of the MAX4881–
MAX4884/MAX4893B. Table 1 shows a selection of
MOSFETs appropriate for use with the MAX4881–
MAX4884/MAX4893B.
IN Bypass Considerations
Bypass IN to GND with a 1F ceramic capacitor to
achieve 15kV ESD-protected input. When the power
source has significant inductance due to long lead
MAX4881–MAX4884/MAX4893B
Overvoltage Protection Controllers with
Current Limit in TDFN
_______________________________________________________________________________________
9
IN
OVLO
UVLO
CHARGE PUMP
IN
OV
FLAGI
EN
CHARGE
PUMP
GND
1.1A/0.7A
LIMIT
IREF
BTA
UVLO
BTA
BTB
CB
MAX4881/MAX4882
MAX4883B/MAX4884B
MAX4893B
BLANKING TIME
AND LATCHOFF LOGIC
GATE
Figure 7a. MAX4881/MAX4882/MAX4883B/MAX4884B/
MAX4893B Functional Diagram
IN
OVLO
UVLO
CHARGE PUMP
GATE
IN
OV
FLAGI
EN
CHARGE
PUMP
GND
1.1A/0.7A
LIMIT
IREF
BTA
UVLO
BTA
BTB
CB
MAX4883C/MAX4884C
BLANKING TIME
LOGIC
Figure 7b. MAX4883C/MAX4884C Functional Diagram
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