RESET

OUT

OUT

6

5

4

IN

IN

EN

GND

3

28

24

23

VI

C1

0.1

µF

50 V

RESET

VO

10

µF

+

TPS767D3xx

CO

250 k

Ω

V

O +

V

ref

1 )

R1

R2

where:

Vref = 1.1834 V typ (the internal reference voltage)

R1 +

V

O

V

ref

* 1

R2

OUTPUT

VOLTAGE

R1

R2

2.5 V

3.3 V

3.6 V

4 75V

UNIT

33.2

53.6

61.9

90.8

30.1

30.1

30.1

30.1

k

Ω

k

Ω

k

Ω

k

Ω

OUTPUT VOLTAGE

PROGRAMMING GUIDE

VO

VI

RESET

OUT

FB / NC

R1

R2

GND

EN

IN

<0.5V

>2.7 V

RESET Output

0.1

µF

250 k

Ω

+

10

µF

CO

TPS767D301-EP

www.ti.com

SGLS327A – FEBRUARY 2006 – REVISED APRIL 2010

Figure 26. Typical Application Circuit (Fixed Versions) for Single Channel

Programming the TPS767D301-EP Adjustable LDO Regulator

The output voltage of the TPS767D301-EP adjustable regulator is programmed using an external resistor divider

as shown in Figure 27. The output voltage is calculated using:

(1)

Resistors R1 and R2 should be chosen for approximately 50-mA 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 = 30.1 k

Ω

to set the divider current at 50 mA and then calculate R1 using:

(2)

Figure 27. TPS767D301-EP Adjustable LDO Regulator Programming

Reset Indicator

The TPS767D301-EP features a RESET output that can be used to monitor the status of the regulator. The

internal comparator monitors the output voltage. When the output drops to 95% (typical) of its regulated value,

the RESET output transistor turns on, taking the signal low. The open-drain output requires a pullup resistor. If

not used, it can be left floating. RESET can be used to drive power-on reset circuitry or as a low-battery

indicator.

Copyright © 2006–2010, Texas Instruments Incorporated

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