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參數(shù)資料
| 型號(hào)： | MAX890LESA-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Single Peripheral Driver |
| 中文描述： | 1.2 A SWITCHING REGULATOR, PDSO8 |
| 封裝： | 0.150 INCH, SOIC-8 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 734K |
| 代理商： | MAX890LESA-T |
M
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
_______________________________________________________________________________________
7
Slow-Loop Response in the
Typical Operating
Characteristics
.
Thermal Shutdown
The MAX890L features thermal shutdown. The switch
turns off when the junction temperature exceeds
+135°C. Once the device cools by 10°C, the switch
turns back on. If the fault short-circuit condition is not
removed, the switch will cycle on and off, resulting in a
pulsed output.
Fault Indicator
The MAX890L provides a fault output (
FAULT
). This
open-drain output goes low when in current limit or
when the die temperature exceeds +135°C. A 100k
pull-up resistor from
FAULT
to IN provides a logic-
control signal.
Applications Information
Input Capacitor
To limit the input voltage drop during momentary output
short-circuit conditions, connect a capacitor 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. One
function of this capacitor is to prevent inductive para-
sitics from pulling OUT negative during turn-off.
Layout and Thermal-Dissipation
Consideration
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 as possible to the device
(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
2
LIMIT
x 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-overload-protection circuitry turns
the switch off until the die temperature falls by 10°C. A
ground plane in contact with the device will help dissi-
pate additional heat.
Chip Information
TRANSISTOR COUNT: 396
MAX890L
SET
R
SET
GND
Figure 2. Setting the Current Limit
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