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參數(shù)資料
| 型號(hào)： | MAX4995AFAVB+ |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 342K |
| 描述： | IC CURRENT SWITCH 10% 10UTQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 功能： | 電流開(kāi)關(guān) |
| 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(yīng)商設(shè)備封裝： | 10-UTQFN（1.4x1.8） |
| 包裝： | 管件 |
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50mA to 600mA Programmable
Current-Limit Switches
______________________________________________________________________________________ 11
Applications Information
Setting the Current Limit
A resistor from SETI to ground programs the current-limit
value for the MAX4995. Table 2 lists various current lim-
its set by different resistor values at SETI. Shorting SETI
to ground asserts FLAG.
Use the following formula to calculate the current limit:
Using an R
SETI
with a value smaller than 45.8k?results
in a higher current limit. A programmed output current
greater than 660mA can damage the device.
Connecting any capacitance larger than 20pF to SETI
can cause instability.
Input Capacitor
Connect a capacitor from IN to GND to limit the input
voltage drop during momentary output short-circuit
conditions. Use a 1礔 minimum ceramic capacitor for
proper device operation. Larger capacitor values
reduce the voltage undershoot at the input.
Due to the very fast current-limit reaction time of the
MAX4995AF, a larger input capacitance might need to
be connected at the input to dampen oscillation due to
long wires. Choose a value large enough to ensure IN
doesnt exceed the absolute maximum ratings.
Output Capacitor
For stable operation over the full temperature range
and over the full programmable current-limit range, use
a 1礔 ceramic capacitor from OUT to ground.
If the load capacitance is too large, then current may not
have enough time to charge the capacitance and the
device assumes that there is a faulty load condition.
Calculate the maximum capacitive load (C
MAX
) value that
can be connected to OUT using the following formula:
For example, for V
IN
= 3.3V, t
BLANK(MIN)
= 10ms, and
I
LIM
= 300mA, C
MAX
equals 909礔.
Due to the very fast current-limit reaction time of the
MAX4995AF, a larger output capacitance might need to
be connected at the output to dampen oscillation due
to long wires. Choose a value large enough to ensure
OUT doesnt exceed the absolute maximum ratings.
Layout and Thermal Dissipation
To optimize the switch response time to output short-
circuit conditions, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors
as close as possible to the device. IN and OUT must be
connected with wide, short traces to the power bus.
During normal operation, the power dissipation is small
and the package temperature change is minimal. If the
output is continuously shorted to ground at the maxi-
mum supply voltage, the operation of the switches with
the autoretry option does not cause problems because
the total power dissipated during the short is scaled by
the duty cycle:
Attention must be given to the MAX4995C continuous
current-limit version when the power dissipation during
a fault condition may cause the device to reach thermal
shutdown threshold.
P
V
I
t
t
t
MAX
IN(MAX)
OUT(MAX)
BLANK
RETRY
BLANK
=
?/DIV>
?/DIV>
+
C
( F)
I (mA) t
(ms)
V (
MAX
LIM
BLANK(MIN)
IN
?nbsp =
?/DIV>
V)
R (k )
2
I ( A
2.48 k
SETI
LIM
?/DIV>
?/DIV>
=
9042( )
)
( )
V
m
R
SETI
(k?/SPAN>)
TYPICAL CURRENT LIMIT (mA)
45.8
602
55.6
500
70.6
397
94.2
300
143
200
191
150
287
100
576
50
(Open)
0
Table 2. Current Limit vs. Resistor Values
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| 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(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開(kāi)關(guān) 檢測(cè)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(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| MAX4995AFAVB+T | 功能描述:電源開(kāi)關(guān) 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(kāi)關(guān) 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(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開(kāi)關(guān) 檢測(cè)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(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| MAX4995ALAVB+T | 功能描述:電源開(kāi)關(guān) 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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