Preliminary Datasheet

LP78084

LP78084 – 02 Ver. 1.1 Datasheet

Nov.-2007

Page 2 of 22

Functional Pin Description

P a ckag e Ty pe

P i n C o nf i g urat ion s

TDFN- 16

Pi n Desc ript io n

Pin

PIN

DESCRIPTION

1

FB

Feedback input. This pin must be connected directly to an external resistor divider.

Nominal voltage is 0.6V.

2,10,12,14

GND

Ground.

3

ENB

Enable pin for the step-down converter. When connected to logic low, the step-down

converter is disabled and consumes less than 1 µA of current. When connected to

logic high, the converter resumes normal operation.

4

VINA

Linear regulator input voltage. Connect a 1 µF or greater capacitor from this pin to

ground.

5

OUTA

Linear regulator output. Connect a 2.2µF capacitor from this pin to ground.

6

EN_BAT

Enable pin for the battery charger. When connected to logic low, the battery charger

is disabled and consumes less than 1 µA of current. When connected to logic high, the

charger resumes normal operation.

7

ISET

Charge current set point. Connect a resistor from this pin to ground. Refer to typical

characteristics curves for resistor selection.

8

BAT

Battery charging and sensing.

9

STAT

Charge status input. Open drain status output.

11

ADP

Input for USB/adapter charger.

13

ENA

Enable pin for the linear regulator. When connected to logic low, the regulator is

disabled and consumes less than 1 µA of current. When connected to logic high, it

resumes normal operation.

15

LX

Output of the step-down converter. Connect the inductor to this pin. Internally, it is

connected to the drain of both high- and low-side MOSFETs.

16

VINB

Input voltage for the step-down converter.