Le79489
Data Sheet
Table 2. User-Programmable Components (continued)
The DC feed resistance can be adjusted with a resistance (RFA)
from the RFA pin to ground.
RDC1 + R
DC2
---------------------------------
GDC
RFEED = 2 • RFUSE
+
40 kΩ + RFA
-------------------------------------
GDC = 47.9
120 kΩ + RFA
Thermal Management Equations (Active, Normal, and Reverse Polarity States)
RTMG is connected from TMG to VBAT2 and is used to limit
power dissipation within the SLIC in Active states only.
VBAT2 – 6 V
----------------------------------
ILOOPmax
RTMG
≥
(OVH = 1)
VBAT2 – 7.5 V
---------------------------------------
ILOOPmax
RTMG
≥
(OVH = 0)
Power dissipated in the thermal management resistor, RTMG
,
( VBAT2 – 6 V – (IL • RL))2(RTMG
)
during the Active states.
PRTMG = -------------------------------------------------------------------------------------------
(RTMG + 40)2
(OVH = 1)
( VBAT2 – 7.5 V – (IL • RL))2(RTMG
)
PRTMG = ------------------------------------------------------------------------------------------------
(RTMG + 40)2
(OVH = 0)
Power dissipated in the SLIC while in the Active states.
PSLIC = ( VBAT2 • IL ) – PRTMG – RL • (IL)2 + 0.22 W
11
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
