TPS7301Q Datasheet, PDF (36/43 Pages) Texas Instruments – LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED DELAYED RESET FUNCTION

TPS7301Q, TPS7325Q, TPS7330Q, TPS7333Q, TPS7348Q, TPS7350Q
LOW-DROPOUT VOLTAGE REGULATORS
WITH INTEGRATED DELAYED RESET FUNCTION
SLVS124F – JUNE 1995 – REVISED JANUARY 1999
APPLICATION INFORMATION
external capacitor requirements (continued)
As with most LDO regulators, the TPS73xx family requires an output capacitor for stability. A low-ESR 10-µF
solid-tantalum capacitor connected from the regulator output to ground is sufficient to ensure stability over the
full load range (see Figure 42). Adding high-frequency ceramic or film capacitors (such as power-supply bypass
capacitors for digital or analog ICs) can cause the regulator to become unstable unless the ESR of the tantalum
capacitor is less than 1.2 Ω over temperature. Capacitors with published ESR specifications such as the
AVX TPSD106M035R0300 and the Sprague 593D106X0035D2W work well because the maximum ESR at
25°C is 300 mΩ (typically, the ESR in solid-tantalum capacitors increases by a factor of 2 or less when the
temperature drops from 25°C to – 40°C). Where component height and/or mounting area is a problem,
physically smaller, 10-µF devices can be screened for ESR. Figures 29 through 32 show the stable regions of
operation using different values of output capacitance with various values of ceramic load capacitance.
In applications with little or no high-frequency bypass capacitance (< 0.2 µF), the output capacitance can be
reduced to 4.7 µF, provided ESR is maintained between 0.7 and 2.5 Ω. Because capacitor minimum ESR is
seldom if ever specified, it may be necessary to add a 0.5-Ω to 1-Ω resistor in series with the capacitor and limit
ESR to 1.5 Ω maximum. As shown in the CSR graphs (Figures 29 through 32), minimum ESR is not a problem
when using 10-µF or larger output capacitors.
Below is a partial listing of surface-mount capacitors usable with the TPS73xx family. This information, along
with the CSR graphs, is included to assist in selection of suitable capacitance for the user’s application. When
necessary to achieve low height requirements along with high output current and/or high ceramic load
capacitance, several higher ESR capacitors can be used in parallel to meet the guidelines above.
All load and temperature conditions with up to 1 µF of added ceramic load capacitance:
PART NO.
MFR.
VALUE MAX ESR^† SIZE (H × L × W)^†
T421C226M010AS Kemet 22 µF, 10 V
0.5
2.8 × 6 × 3.2
593D156X0025D2W Sprague 15 µF, 25 V
0.3
2.8 × 7.3 × 4.3
593D106X0035D2W Sprague 10 µF, 35 V
0.3
2.8 × 7.3 × 4.3
TPSD106M035R0300 AVX
10 µF, 35 V
0.3
2.8 × 7.3 × 4.3
Load < 200 mA, ceramic load capacitance < 0.2 µF, full temperature range:
PART NO.
MFR.
VALUE MAX ESR^† SIZE (H × L × W)^†
592D156X0020R2T Sprague 15 µF, 20 V
1.1
1.2 × 7.2 × 6
595D156X0025C2T Sprague 15 µF, 25 V
1
2.5 × 7.1 × 3.2
595D106X0025C2T Sprague 10 µF, 25 V
1.2
2.5 × 7.1 × 3.2
293D226X0016D2W Sprague 22 µF, 16 V
1.1
2.8 × 7.3 × 4.3
Load < 100 mA, ceramic load capacitance < 0.2 µF, full temperature range:
PART NO.
MFR.
VALUE MAX ESR^† SIZE (H × L × W)^†
195D106X06R3V2T Sprague 10 µF, 6.3 V
1.5
1.3 × 3.5 × 2.7
195D106X0016X2T Sprague 10 µF, 16 V
1.5
1.3 × 7 × 2.7
595D156X0016B2T Sprague 15 µF, 16 V
1.8
1.6 × 3.8 × 2.6
695D226X0015F2T Sprague 22 µF, 15 V
1.4
1.8 × 6.5 × 3.4
695D156X0020F2T Sprague 15 µF, 20 V
1.5
1.8 × 6.5 × 3.4
695D106X0035G2T Sprague 10 µF, 35 V
1.3
2.5 × 7.6 × 2.5
† _{Size is in mm. ESR is maximum resistance at 100 kHz and TA = 25°C. Listings are sorted by height.}
36
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265