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參數(shù)資料
| 型號： | MAX893 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| 中文描述： | 1.2A的，限流，高端P溝道開關(guān)與熱關(guān)斷 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 115K |
| 代理商： | MAX893 |
M
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
_______________________________________________________________________________________
7
Thermal Shutdown
The MAX893L features thermal shutdown. The switch
turns off when the junction temperature exceeds
+165°C. Once the device cools by 10°C, the switch
turns back on. If the fault condition is not removed, the
switch will cycle on and off, resulting in a pulsed out-
put.
Fault Indicator
The MAX893L provides a fault output (
FAULT
). This
open-drain output goes low when in current limit or
when the die temperature exceeds +165°C. A 100k
pull-up resistor from
FAULT
to IN provides a logic-
control signal.
Fault Blanking
During start-up in USB applications, the MAX893L
charges the relatively large USB capacitance. This may
activate an unwanted fault signal if the charging current
exceeds the programmed current limit. To “blank out”
this start-up fault signal, add a simple lowpass RC
delay circuit as shown in Figure 3. This circuit provides
a 10ms delay.
Applications Information
Input Capacitor
To limit the input voltage drop during momentary output
short-circuit conditions, connect a capacitor no more
than 5mm from IN to GND. A 1μF ceramic capacitor will
be adequate for most applications; however, higher
capacitor values will further reduce the voltage drop at
the input.
Output Capacitor
Connect a 0.1μF capacitor from OUT to GND to prevent
inductive parasitics from pulling OUT negative during
turn-off.
Layout and Thermal-Dissipation
Considerations
To take full advantage of 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 to the device as possible
(no more than 5mm).
Under normal operating conditions, the package can
dissipate and channel heat away. Calculate the maxi-
mum power as follows:
P = (I
LIMIT)
2
·
R
ON
where R
ON
is the on-resistance of the switch.
When the output is short circuited, the voltage drop
across the switch equals the input supply. Hence, the
power dissipated across the switch increases, as does
the die temperature. If the fault condition is not
removed, the thermal-shutdown protection circuitry
turns the switch off until the die temperature falls by
10°C. A ground plane in contact with the device will
help dissipate additional heat.
Chip Information
TRANSISTOR COUNT: 340
MAX893L
SET
R
SET
GND
Figure 2. Setting the Current Limit
MAX893L
C
0.1
μ
F
BLANKED
SIGNAL
TO μP
R
100k
100k
IN
V
OUT
OUT
INPUT VOLTAGE
+5V
ON/OFF
GND
R
SET
FAULT
SET
Figure 3. Fault-Blanking Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX893L | 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| MAX893LESA | 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| MAX9003 | Low-Power, High-Speed, Single-Supply Op Amp + Comparator + Reference ICs |
| MAX9000 | Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:22; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:22-34 RoHS Compliant: No |
| MAX9000ESA | Circular Connector; No. of Contacts:6; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:22; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:22-5 RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8930EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR MAX8930 - Boxed Product (Development Kits) |
| MAX8930EWJ+T | 功能描述:LED照明驅(qū)動器 WLED Charge Pump RGB Boost LDOs & ALC RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8931EVKIT+ | 制造商:Maxim Integrated Products 功能描述:5V RS232 TRANSCEIVER - Boxed Product (Development Kits) |
| MAX8932EVKIT+ | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX8932EWT120+T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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