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參數(shù)資料
| 型號： | MAX4995AFAVB+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 342K |
| 描述： | IC CURRENT SWITCH 10% 10UTQFN |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 50 |
| 功能： | 電流開關 |
| 精確度： | ±10% |
| 輸入電壓： | 1.7 V ~ 5.5 V |
| 電流 - 輸出： | 600mA |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-UFQFN |
| 供應商設備封裝： | 10-UTQFN（1.4x1.8） |
| 包裝： | 管件 |
50mA to 600mA Programmable
Current-Limit Switches
_______________________________________________________________________________________ 9
Detailed Description
The MAX4995A/MAX4995AF/MAX4995AL/MAX4995B/
MAX4995C programmable current-limit switches oper-
ate from +1.7V to +5.5V and provide internal current
limiting adjustable from 50mA to 600mA. These devices
feature a fixed blanking time and a FLAG output that
notifies the processor when a fault condition is present.
Programmable Current Limit
A resistor from SETI to GND programs the current limit
for the switch (see the Setting the Current Limit sec-
tion). If the output current exceeds the current limit for a
time equal to or longer than t
BLANK
, the output flag
asserts and the MAX4995A/MAX4995AF/MAX4995AL
enter the autoretry mode. The MAX4995B latches off
the switch, and the MAX4995C enters the continuous
current-limit mode.
Autoretry (MAX4995A/MAX4995AF/
MAX4995AL)
When the forward current reaches the current-limit
threshold, the t
BLANK
timer begins counting (Figure 2).
FLAG asserts if the overcurrent-limit condition is pre-
sent for t
BLANK
. The timer resets if the overcurrent con-
dition disappears before the blanking time (t
BLANK
) has
elapsed. A retry time delay (t
RETRY
) starts immediately
after the blanking time has elapsed and during that
time, the switch latches off. At the end of t
RETRY
, the
switch turns on again. If the fault still exists, the cycle
repeats. If the fault has been removed, the switch stays
on. During this cycle, FLAG stays low. In autoretry if
the thermal power rating of the package is exceeded,
the MAX4995A/MAX4995AF/MAX4995AL go into ther-
mal shutdown.
The autoretry feature saves system power in case of an
overcurrent or short-circuit condition. During t
BLANK
time when the switch is on, the supply current is held at
the current limit. During time t
RETRY
when the switch is
off, the current through the switch is zero. Thus, the
average output current is much less than the pro-
grammed current limit. Calculate the average output
current using the following equation:
I
LOAD
= I
LIM
[t
BLANK
/(t
BLANK
+ t
RETRY
)]
With a typical t
BLANK
= 16.3ms and typical t
RETRY
=
524ms, the duty cycle is 3%, resulting in a 97% power
savings over the switch being on the entire time.
Latchoff (MAX4995B)
When the forward current reaches the current-limit
threshold, the t
BLANK
timer begins counting (Figure 3).
FLAG asserts if an overcurrent-limit condition is present
for greater than t
BLANK
time. The timer resets if the over-
current condition disappears before t
BLANK
has
elapsed. The switch turns off if the overcurrent condition
continues beyond the blanking time. Reset the switch
by either toggling the control logic (ON) or cycling the
input voltage. If the thermal power rating of the pack-
age is exceeded during t
BLANK
, the MAX4995B goes
into thermal shutdown.
Continuous Current Limit (MAX4995C)
When the forward current reaches the forward current-
limit threshold, the MAX4995C limits the output current
to the programmed current limit. FLAG asserts if the
current limit is present for t
BLANK
and deasserts when
the overload condition is removed. In this mode, if the
thermal power rating of the package is exceeded, the
MAX4995C goes into thermal shutdown.
Switch-On/Off Control
The ON input for the MAX4995_/MAX4995AF and ON
input for the MAX4995AL control the switch; see Table
1. Toggle ON for the MAX4995B to reset the fault condi-
tion once the short current is detected and the device
shuts down.
Reverse-Current Protection
The MAX4995 features a reverse-current protection cir-
cuit that limits the backflow current to 10礎 when the
output voltage exceeds the input voltage by 110mV
(typ). The switch turns off and FLAG asserts without
waiting for t
BLANK
to elapse. The switch turns back on
and FLAG deasserts when the output voltage drops
below the detecting threshold by 10mV (typ).
MAX4995_/
MAX4995AF
MAX4995AL
ON
ON
SWITCH
STATUS
0
1
Off
1
0
On
Table 1. Switch Truth Table
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4995AFAVB+ | 功能描述:IC CURRENT SWITCH 10% 10UTQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 功能:電流開關 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應商設備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| MAX4995AFAVB+T | 功能描述:電源開關 IC - USB 50mA to 600mA Programmable CLS RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4995ALAUT+T | 功能描述:電源開關 IC - USB 50mA to 600mA Programmable CLS RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4995ALAVB+ | 功能描述:IC CURRENT SWITCH 10% 10UTQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 功能:電流開關 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應商設備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| MAX4995ALAVB+T | 功能描述:電源開關 IC - USB 50mA to 600mA Programmable CLS RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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