TPS9110 Datasheet, PDF (19/23 Pages) Texas Instruments – CELLULAR SUBSCRIBER TERMINAL POWER SUPPLY

REF
0.1 µF
TPS9110
CELLULAR SUBSCRIBER TERMINAL
POWER SUPPLY
SLVS164 – AUGUST 1997
APPLICATION INFORMATION
Voltage
Reference
REF
BATTERY
Charge Pump
Regulator
B
1 µF
4.7 µF
3.3 V
7–13 µF
RF
Section
Regulator
A
3.3 V
7–13 µF
Analog
Section
EN
ON
ON_REM
Regulator
L
Reset
Generator
3.3 V
7–13 µF
RESET
OFF
ON
Processor
and
Logic
Section
GND
Figure 25. Typical Application
LDOs (VL, VA, VB) output capacitors
A 10-µF capacitor must be tied to Cx (CL, CA, or CB). The Cx terminal is connected internally to the output of
the LDO through a 1-Ω resistor. The stability of LDOs is dependent on the ESR of the output filter capacitor. Most
LDOs are designed to be stable over a narrow range of ESR with lower limits and upper limits, thus limiting the
type of capacitor that can be used. With the use of the internal 1-Ω resistor, the lower ESR limit of the capacitor
is eliminated, permitting the upper limit to be raised. Therefore, almost any tantalum or ceramic capacitor can
be used, provided the ESR does not exceed 15 Ω over operating temperature range.
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