Datasheet

TPS7201Q, TPS7225Q, TPS7230Q
TPS7233Q, TPS7248Q, TPS7250Q, TPS72xxY
MICROPOWER LOW-DROPOUT (LDO) VOLTAGE REGULATORS
SLVS102G – MARCH 1995 – REVISED JUNE 2000
27
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
C1
0.1 µF
NOTE A: TPS7225, TPS7230, TPS7233, TPS7248, TPS7250
(fixed-voltage options).
SENSE
PG
OUT
OUT
6
5
4
IN
IN
EN
GND
3
2
1
7
8
V
I
PG
CSR = 1 Ω
V
O
10 µF
+
TPS72xx
(see Note A)
250 kΩ
Figure 31. Typical Application Circuit
external capacitor requirements
Although not required, a 0.047-µF to 0.1-µF ceramic bypass input capacitor, connected between IN and GND
and located close to the TPS72xx, is recommended to improve transient response and noise rejection. A
higher-value electrolytic input capacitor may be necessary if large, fast-rise-time load transients are anticipated
and the device is located several inches from the power source.
An output capacitor is required to stabilize the internal feedback loop. For most applications, a 10-µF to 15-µF
solid-tantalum capacitor with a 0.5-Ω resistor (see capacitor selection table) in series is sufficient. The maximum
capacitor ESR should be limited to 1.3 Ω to allow for ESR doubling at cold temperatures. Figure 32 shows the
transient response of a 5-mA to 85-mA load using a 10-µF output capacitor with a total ESR of 1.7 Ω.
A 4.7-µF solid-tantalum capacitor in series with a 1-Ω resistor may also be used (see Figures 27 and 28)
provided the ESR of the capacitor does not exceed 1 Ω at room temperature and 2 Ω over the full operating
temperature range.