Datasheet
SLVS323B − FEBRUARY 2001 − REVISED JANUARY 2007
7
APPLICATION INFORMATION
The TPS76201 low-dropout (LDO) regulator has been optimized for use in battery-operated equipment
including, but not limited to, the sub 1.2-V DSP core voltage supplies. It features low quiescent current (23 µA
nominally) and enable inputs to reduce supply currents to 1 µA when the regulators are turned off.
A typical application circuit is shown in Figure 17.
V
O
V
I
OUT
FB
GND
EN
IN
TPS76201
1 µF
3
1
4
2
5
ESR = 0.5 Ω
4.7 µF
+
C1
Figure 17. Typical Application Circuit
external capacitor requirements
Although not required, a 0.047-µF or larger ceramic input bypass capacitor, connected between IN and GND
and located close to the TPS76201, 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.
Like all low dropout regulators, the TPS76201 requires an output capacitor connected between OUT and GND
to stabilize the internal control loop. The minimum recommended capacitance is 4.7 µF. The ESR (equivalent
series resistance) of the capacitor should be between 0.3 Ω and 1.5 Ω. to ensure stability. Capacitor values
larger than 4.7 µF are acceptable, and allow the use of smaller ESR values. Capacitances less than 4.7 µF are
not recommended because they require careful selection of ESR to ensure stability. Solid tantalum electrolytic,
aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements
described above. Most of the commercially available 4.7 µF surface-mount solid tantalum capacitors, including
devices from Sprague, Kemet, and Nichico, meet the ESR requirements stated above. Multilayer ceramic
capacitors may have very small equivalent series resistances and may thus require the addition of a low value
series resistor to ensure stability.
CAPACITOR SELECTION
PART NO. MFR. VALUE MAX ESR
†
SIZE (H × L × W)
‡
T494B475K016AS KEMET 4.7 µF 1.5 Ω 1.9 × 3.5 × 2.8
195D106x0016x2T SPRAGUE 10 µF 1.5 Ω 1.3 × 7.0 × 2.7
695D106x003562T SPRAGUE 10 µF 1.3 Ω 2.5 × 7.6 × 2.5
TPSC475K035R0600 AVX 4.7 µF 0.6 Ω 2.6 × 6.0 × 3.2
†
ESR is maximum resistance in Ohms at 100 kHz and T
A
= 25°C. Contact manufacturer for minimum ESR values.
‡
Size is in mm.
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