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參數(shù)資料
| 型號： | MAX4766BETA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 0.075A to 1.5A, Programmable Current-Limit Switch |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEEC, TINY, TDFN-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 326K |
| 代理商： | MAX4766BETA |
M
0.075A to 1.5A, Programmable
Current-Limit Switch
8
_______________________________________________________________________________________
Detailed Description
The MAX4766 is a current-limit switch that operates
from a 2.25V to 4.5V input voltage range and has a pro-
grammable current limit from 0.075A to 1.5A with a
±10% accurate current limit. The device features an
adjustable blanking time, an adjustable soft-start time,
and an output indicator,
FLAG,
that notifies the proces-
sor when a fault condition is present (Figure 1). The
MAX4766 is available in latch-off, autoretry, and contin-
uous current-limit versions (see the
Selector Guide
).
Programmable Current Limit
A resistor from SETI to GND programs the current limit
for the switch (see the
Setting the Current Limit
section).
The MAX4766 increases the pass transistor’s gate drive
when the programmed current-limit value is reached. If
the load current exceeds the current limit for longer than
the t
BLANK
period, the switch either goes into autoretry,
latches off, or stays in the continuous mode until the
thermal limit is reached.
Programmable Soft-Start
The MAX4766 features an adjustable soft-start time to
control the output voltage ramp rate, thereby limiting the
inrush surge current. An external capacitor from SETS to
GND sets the soft-start time. The value of the capacitor
directly determines the typical soft-start time. Use the
following formula to determine the soft-start time:
Leave SETS floating to choose 1ms minimum preset
soft-start time.
Programmable Blanking Time
(MAX4766A/MAX4766B)
The adjustable fault-blanking time feature of the
MAX4766 ensures that no fault signal asserts during
power-up or when there is a momentary short caused
by hot-swapping a capacitive load. An external capaci-
tor from SETB to GND sets the blanking time. When a
short or load transient causes the device to enter current
limit, an internal counter monitors the duration of the
fault after the soft-start time elapses. For the MAX4766B,
FLAG
signal asserts low when load faults exceed the
programmed blanking time (t
BLANK
). If the fault condi-
tion is removed before the programmed blanking time
period has elapsed, the timer resets and the
FLAG
sig-
nal does not assert (see Figures 2a and 2b). Only cur-
rent-limit and short-circuit faults are blanked.
Soft Start ms
C
nF
1
ms
1
SETS
=
×
(
)
Figure 2a. Latch-Off Fault Blanking (Toggling ON)
LOAD
CURRENT
SWITCH
STATUS
ON
VOLTAGE
t
BLANK
t
BLANK
OFF
ON
FLAG
STATUS
Figure 2b. Latch-Off Fault Blanking (Cycling IN Below UVLO)
LOAD
CURRENT
SWITCH
STATUS
V
IN
UNLO
OFF
ON
t
BLANK
t
BLANK
FLAG PIN
STATUS
C
SETB
(μF)
TYPICAL BLANKING TIME
(ms)
1
8
19
35
50
65
80
100
115
125
150
Open
0.01
0.025
0.05
0.075
0.1
0.125
0.150
0.175
0.2
0.25
Table 1. Blanking Time vs. Capacitor Values
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4766BETA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4766BETA-T | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LIMIT SWITCH - Tape and Reel |
| MAX4766CETA | 制造商:Maxim Integrated Products 功能描述:.075A TO 1.4A ADJUSTABLE CURRENT LI - Rail/Tube |
| MAX4766CETA+ | 制造商:Maxim Integrated Products 功能描述:CURRENT LIMIT SW 1-IN 1-OUT 2.25V TO 4.5V 640A 8TDFN EP - Rail/Tube |
| MAX4766CETA+T | 功能描述:電源開關(guān) IC - 配電 75mA-1.5A Prog Current-Limit Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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