TLV1117CDCY datasheet(11/24 Pages) TI

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APPLICATION INFORMATION

µF

(see Note C)

100

µF

(see Note A)

INPUT

OUTPUT

ADJ/GND

TLV1117 − ADJ

CADJ

(see Note B)

1N4002 (See Note D)

IADJ

VREF

Because IADJ typically is 55 µA, it is negligible in most applications.

OUT

+ VREF 1 )

) (IADJ

R2)

VOUT is calculated as:

TLV1117

ADJUSTABLE AND FIXED LOW-DROPOUT VOLTAGE REGULATOR

SLVS561G – DECEMBER 2004 – REVISED APRIL 2006

Output capacitor selection is critical for regulator stability. Larger COUT values benefit the regulator by improving

transient response and loop stability.

CADJ can be used to improve ripple rejection. If CADJ is used, a COUT that is larger in value than CADJ must be used.

CIN is recommended if TLV1117 is not located near the power-supply filter.

An external diode is recommended to protect the regulator if the input instantaneously is shorted to GND.

This device is designed to be stable with tantalum and aluminum electrolytic output capacitors having an ESR

between 0.2

Ω and 10 Ω.

Figure 1. Basic Adjustable Regulator

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