LP8720TLE NSC [National Semiconductor], LP8720TLE Datasheet - Page 11

• Manufacturer Part Number: LP8720TLE
• Description: One Step-Down DC/DC and Five Linear Regulators with I2C Compatible Interface
• Manufacturer: NSC [National Semiconductor]

Support Functions
REFERENCE
LP8720 has internal reference block creating all necessary
references and biasing for all blocks.
OSCILLATOR
There is internal oscillator giving clock to the bucks and to
logic control.
V
THERMAL SHUTDOWN
The Thermal Shutdown (TSD) function monitors the chip tem-
perature to protect the chip from temperature damage caused
BATT
Parameter
frequency
Oscillator
=3.6V
Typ
2.0
Min
1.9
Max
2.1
MHz
Unit
11
eg. by excessive power dissipation. The temperature moni-
toring function has two threshold values TSD and TSD_EW
that result in protective actions.
When TSD_EW +125ºC is exceeded, then IRQ_N is set to
low and “1” is written to TSD_EW bit in both STATUS register
and in INTERRUPT register.
If the temperature exceeds TSD +160ºC, then PMU initiates
Emergency Shutdown.
The POWER UP operation after Thermal Shutdown can be
initiated only after the chip has cooled down to the +115ºC
threshold
*) Guaranteed by design.
Parameter
TSD *)
TSD_EW *)
TSD_EW Hysteresis *)
Typ
160
125
10
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Unit
°C
°C
°C