STMPS2171TTR STMicroelectronics, STMPS2171TTR Datasheet - Page 9

• Manufacturer Part Number: STMPS2171TTR
• Description: IC PWR SWITCH 1CH 1000MA 8-MSOP
• Manufacturer: STMicroelectronics
• Type: High Side Switchr

Specifications of STMPS2171TTR

• Number Of Outputs: 1
• Rds (on): 125 mOhm
• Internal Switch(s): Yes
• Current Limit: 1A
• Voltage - Input: 2.7 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Switch Type: High Side
• Power Switch Family: STMPS2171
• Input Voltage: 5V
• Power Switch On Resistance: 130mOhm
• Output Current: 0A
• Mounting: Surface Mount
• Supply Current: 40uA
• Package Type: TSSOP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Pin Count: 8
• Power Dissipation: 130W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6938-2; STMPS2171TTR

STMPS2141, STMPS2151, STMPS2161, STMPS2171
3
3.1
3.2
3.3
Functional description
Fault blanking
The STMPS devices feature a 10 ms fault blanking. Fault blanking allows current-limit faults,
including momentary short-circuit faults that occur when hot-swapping a capacitive load,
and also ensures that no fault is issued during power-up. When a load transient causes the
device to enter current limit, an internal counter starts. If the load fault persists beyond the
10 ms fault-blanking timeout, the FAULT output asserts “low”. Load-transient faults less than
10 ms (typ.) do not cause a FAULT output assertion. Only current-limit faults are blanked.
Die over-temperature faults and input voltage drops below the UVLO threshold cause an
immediate fault output.
Overcurrent/over-temperature protection
In overcurrent or short-circuit condition, the switch limits the current at a value of about
120% of the rated current. If the temperature of the die goes above the limit value, the switch
turns off.
FAULT conditions
In power switch applications, 4 types of FAULT conditions are common. These fault
conditions and the response of the STMPS21x1 power switches are described in the
following
Table 3.
Undervoltage
Over-current
Overheating
Short circuit
Fault
Table
FAULT conditions
3.
Output shorted to GND via resistance
path of < 1 Ω , causing a rapid current
surge.
Output connected to a load that sinks
current above threshold.
Temperature of junction exceeds 135°C
due to any reason.
Input voltage drops below the UVLO
treshold.
Condition
Doc ID 13793 Rev 4
Reduces output voltage to reduce the
current. Asserts FAULT pin after a
blanking period
Reduces output voltage to reduce the
current. Asserts FAULT pin after a
blanking period.
Turn OFF output until temperature falls
below 125°C. Asserts FAULT pin
immediately.
Turn OFF output until input voltage rises
above the UVLO treshold plus hysteresis.
Asserts FAULT pin immediately.
STMPS21x1 action
Functional description
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