zl2103 Intersil Corporation, zl2103 Datasheet - Page 23

• Manufacturer Part Number: zl2103
• Description: 3a Digital-dc Synchronous Step-down Dc/dc Converter
• Manufacturer: Intersil Corporation

the user may also configure a specific ramp rate using the SS
pin. Tracking mode is enabled through the CFG pin, as shown in
Table 16, and configured through the SS pin, as shown in
Table 13.
Any device that is configured for tracking mode will ignore its
soft-start delay and ramp time settings (SS pin) and its output
will take on the turn-on/turn-off characteristics of the reference
voltage present at the VTRK pin. All of the ENABLE pins in the
tracking group must be connected together and driven by a
single logic source.
Tracking mode can also be configured via the I
interface by using the TRACK_CONFIG PMBus command. Please
refer to Application Note
configuring tracking mode using PMBus.
Voltage Margining
The ZL2103 offers a simple means to vary its output higher or
lower than its nominal voltage setting in order to determine
whether the load device is capable of operating over its specified
supply voltage range. The MGN command is set by driving the
MGN pin or through the I
tri-level input that is continuously monitored and can be driven
directly by a processor I/O pin or other logic-level output.
(kΩ)
19.6
21.5
23.7
26.1
28.7
31.6
34.8
38.3
56.2
61.9
68.1
82.5
90.9
100
110
R
75
SS
UVLO
5.5
7.5
(V)
2
AN2033
C/SMBus interface. The MGN pin is a
TRACKING RATIO
23
for more information on
100
100
(%)
50
50
2
TABLE 13. TRACKING MODE CONFIGURATION
C/SMBus
Limited by target voltage
Limited by target voltage
Limited by target voltage
Limited by target voltage
Limited by VTRK pin voltage
Limited by VTRK pin voltage
Limited by VTRK pin voltage
Limited by VTRK pin voltage
UPPER TRACK LIMIT
ZL2103
The ZL2103’s output will be forced higher than its nominal set
point when the MGN command is set HIGH, and the output will
be forced lower than its nominal set point when the MGN
command is set LOW. Default margin limits of V
loaded in the factory, but the margin limits can be modified
through the I
low as 0V, where V
determined by the VSET pin. A safety feature prevents the user
from configuring the output voltage to exceed V
any conditions.
The margin limits and the MGN command can both be set
individually through the I
transition rate between the nominal output voltage and either
margin limit can be configured through the I
Please refer to Application Note
on modifying the margining configurations.
Output not allowed to decrease before PG
Output will always follow VTRK
Output not allowed to decrease before PG
Output will always follow VTRK
Output not allowed to decrease before PG
Output will always follow VTRK
Output not allowed to decrease before PG
Output will always follow VTRK
Output not allowed to decrease before PG
Output will always follow VTRK
Output not allowed to decrease before PG
Output will always follow VTRK
Output not allowed to decrease before PG
Output will always follow VTRK
Output not allowed to decrease before PG
Output will always follow VTRK
2
C/SMBus interface to as high as V
NOM
is the nominal output voltage set point
RAMP-UP/DOWN BEHAVIOR
2
C/SMBus interface. Additionally, the
AN2033
for detailed instructions
2
C/SMBus interface.
NOM
NOM
NOM
+ 10% under
±5% are pre-
+ 10% or as
May 3, 2011
FN6966.5