ST890DTR STMicroelectronics, ST890DTR Datasheet - Page 9

• Manufacturer Part Number: ST890DTR
• Description: IC PWR SWITCH 1.2A HISIDE 8-DFN
• Manufacturer: STMicroelectronics
• Type: High Sider

Specifications of ST890DTR

• Input Type: Non-Inverting
• Number Of Outputs: 1
• On-state Resistance: 75 mOhm
• Current - Output / Channel: 1.2A
• Current - Peak Output: 1.5A
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Switch Type: High Side
• Power Switch Family: ST890
• Input Voltage: 2.7 to 5.5V
• Power Switch On Resistance: 90mOhm
• Output Current: 1.2A
• Mounting: Surface Mount
• Package Type: DFN
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Pin Count: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6833-2

ST890
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
Functional description
Output current limit
I
When I
Output short circuit protection
The ST890 provides short circuit protection by limiting the output current during a short
circuit event.
I
such as V
When the output is short circuit, the Fault pin is asserted.
Programming I
The ST890's I
SET pin (pin 5).
I
Equation 1
Equation 2
therefore:
Equation 3
Fault pin
The Fault pin (pin 8) is an open drain active low output. This pin should be connected to an
external pull-up resistor.
The Fault pin is asserted low when:
Thermal protection
The ST890's thermal protection is triggered to turn off the switch when the junction
temperature exceeds 130°C (typ).
LIM
sc
LIM
is the output short circuit current limit level (typ 1.2 x I
is the output current that ST890 limits under the condition V
is determined by the following relationships:
–
–
–
LIM
I
A short circuit event occurs
The device goes into thermal protection
O
OUT
is reached, the Fault pin is asserted.
< 1.6 V, the ST890 limits the output current to no more than the I
LIM
reaches the programmed I
can be programmed through the external resistor, R
LIM
R
SET
I
SET
I
LIM
=
1.24
=
LIM
I /
V
SET
SET
value
x
=
1110
/
1110
R
SET
I /
LIM
LIM
). When the output is short circuit
O
(output voltage) > 1.6 V.
SET
connected at the
Maximum rating
sc
level.
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