zl2005 Intersil Corporation, zl2005 Datasheet - Page 31

• Manufacturer Part Number: zl2005
• Description: Digital-dc? Integrated Power Management And Conversion Ic
• Manufacturer: Intersil Corporation

Please refer to Application Note AN15 for details on
how to select specific overcurrent fault response
options via the I
6.5 Thermal Protection
The ZL2005 includes an on-chip thermal sensor that
continuously measures the internal temperature of the
die and will shut down the device when the tempera-
ture exceeds the preset limit. The default temperature
limit is set to 125°C in the factory, but the user may set
the limit to a different value if desired. See Applica-
tion Note AN13 for details. Note that setting a higher
thermal limit via the I
in permanent damage to the device. Once the device
has been disabled due to an internal temperature fault,
the user may select one of several fault response
options as follows:
1. Initiate a shutdown and attempt to restart an infi-
2. Initiate a shutdown and attempt to restart the
3. Continue operating throughout a specific delay
4. Continue operating throughout the fault (this
5. Initiate an immediate shutdown.
If the user has configured the device to restart, the
device will wait the preset delay period (if configured
to do so) and will then check the temperature. If the
temperature has dropped below a value that is approx-
imately 15°C lower than the selected temperature limit
(the over-temperature warning threshold), the device
will attempt to re-start. If the temperature is still
above the over-temperature warning threshold, the
device will wait the preset delay period and retry
again.
The default response from a temperature fault is an
immediate shutdown of the device. The device will
continuously check for the presence of the fault condi-
tion. If the fault condition is no longer present, the
ZL2005 will be re-enabled.
Please refer to Application Note AN13 for details on
how to select specific temperature fault response
options via the I
nite number of times with a preset delay time.
power supply a preset number of times with a pre-
set delay between attempts.
time, followed by shutdown.
could result in permanent damage to the power
supply).
2
2
C/SMBus interface.
C/SMBus interface.
2
C/SMBus interface may result
31
ZL2005
6.6 Voltage Tracking
Numerous high performance systems place stringent
demands on the order in which the power supply volt-
ages are turned on. This is particularly true when
powering FPGAs, ASICs, and other advanced proces-
sor devices that require multiple supply voltages to
power a single die. In most cases, the I/O operates at a
higher voltage than the Core and therefore the Core
supply voltage, must not exceed the I/O supply voltage
by some amount (typically 300 mV).
Voltage tracking protects these sensitive ICs by limit-
ing the differential voltage between multiple power
supplies during the power-up and power down
sequence. The ZL2005 integrates a lossless tracking
scheme that allows its output to track a voltage that is
applied to the VTRK pin with no external components
required. The VTRK pin is an analog input that, when
tracking mode is enabled, configures the voltage
applied to the VTRK pin to act as a reference for the
device’s output regulation.
The ZL2005 offers two modes of tracking:
1. Coincident. This mode configures the ZL2005 to
2. Ratiometric. This mode configures the ZL2005 to
Figure 17 illustrates the typical connection and the two
tracking modes.
ramp its output voltage at the same rate as the volt-
age applied to the VTRK pin.
ramp its output voltage at a rate that is a percent-
age of the voltage applied to the VTRK pin. The
default setting is 50%, but an external resistor
string may be used to configure a different track-
ing ratio.
February 18, 2009
FN6848.0