R2

GND

Fast Turn

On Circuit

1.23V

Over Current &

Thermal Protection

Bypass

R1

1.40V

ON

t

0.4V

OFF

d

LP3985

SNVS087AC – OCTOBER 2000 – REVISED MAY 2013

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DESCRIPTION (CONTINUED)

The LP3985 is available in a 5-bump thin DSBGA and a 5-pin USON package. Performance is specified for

−40°C to +125°C temperature range and is available in 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V. 3.1V, 3.2V,

3.3V, 4.7V, 4.75V, 4.8V and 5.0V output voltages. For other output voltage options between 2.5V to 5.0V or for a

dual LP3985, please contact a Texas Instruments sales office.

Block Diagram

Figure 2.

PIN DESCRIPTIONS

Name

* DSBGA

USON

Function

A1

3

Enable Input Logic, Enable High

GND

B2

2

Common Ground

C1

5

Output Voltage of the LDO

C3

1

Input Voltage of the LDO

BYPASS

A3

4

Optional Bypass Capacitor for Noise Reduction

Connection Diagram

Figure 3. Top View USON 5-Pin Package

Figure 4. Top View 5-Bump DSBGA Package

Package Number MF05A

Package Number TLA05

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

2

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