TPS77501Q1, '515Q1, '516Q1, '518Q1, '525Q1, '533Q1 WITH RESET OUTPUT

TPS77601Q1, '77615Q1, '77618Q1, '77625Q1, '77628Q1, '77633Q1 WITH PG OUTPUT

FAST TRANSIENT RESPONSE 500mA LOW DROPOUT VOLTAGE REGULATORS

SGLS012B − MARCH 2003 − REVISED APRIL 2008

16

POST OFFICE BOX 655303

APPLICATION INFORMATION

external capacitor requirements (continued)

RESET/

PG

OUT

OUT

7

6

5

IN

IN

EN

GND

3

16

14

13

VI

C1

0.1

µF

RESET/PG

VO

10

µF

+

Co

250 k

Ω

Figure 25. Typical Application Circuit (Fixed Versions)

programming the TPS77x01 adjustable LDO regulator

The output voltage of the TPS77x01 adjustable regulator is programmed using an external resistor divider as

shown in Figure 26. The output voltage is calculated using:

V

O +

V

ref

1

) R1

R2

(1)

Where:

Resistors R1 and R2 should be chosen for approximately 10-

µA divider current. Lower value resistors can be

used but offer no inherent advantage and waste more power. Higher values should be avoided as leakage

currents at FB increase the output voltage error. The recommended design procedure is to choose

R2 = 110 k

Ω to set the divider current at approximately 10 µA and then calculate R1 using:

R1

+

V

O

V

ref

* 1

R2

(2)

OUTPUT

VOLTAGE

R1

R2

2.5 V

3.3 V

3.6 V

4.75 V

UNIT

121

196

226

332

110

110

110

110

k

Ω

k

Ω

k

Ω

k

Ω

OUTPUT VOLTAGE

PROGRAMMING GUIDE

VO

VI

RESET/

PG

OUT

FB / NC

R1

R2

GND

EN

IN

≤ 0.9 V

≥ 1.7 V

TPS77x01

Reset or PG Output

0.1

µF

250 k

Ω

Co

Figure 26. TPS77x01 Adjustable LDO Regulator Programming