AAT3603178

Total Power Solution for Portable Applications

PRODUCT DATASHEET

3603.2008.06.1.0

3

www .analogictech.com

AAT3603178

Total Power Solution for Portable Applications

PRODUCT DATASHEET

3603.2008.06.1.0

3

www .analogictech.com

Pin Descriptions

Pin #

Symbol

Function

1

EN_TEST

Similar to EN_HOLD but intended for use with the automatic tester or as a hands free enable input pin indi-

cating hands free phone operation with a headset. It is also internally pulled to GND when floating.

2

EN_HOLD

Enable for the system. EN_HOLD must be held high by the processor to maintain core power. It is internally

pulled to GND when floating.

3

EN_KEY

Enable for the system. An internal pull-up resistor keeps the pin pulled up to an internal supply to keep the

system off when there is no CHGIN input. Connect a normally-open pushbutton switch from this pin to GND.

There is an internal 300ms debounce delay circuit to filter noise.

4

ON_KEY

Buffered logic output of the EN_KEY pin with a logic signal from ground to OUT1.

5

EN2

Enable for LDO2 (PowerAnalog or PLL). (Internally pulled low when floating)

6

EN3

Enable for LDO3 (TCXO). (Internally pulled low when floating)

7

EN4

Enable for LDO4 (TX) (Internally pulled low when floating)

8

EN5

Enable for LDO5 (RX) (Internally pulled low when floating)

9

OUT5

Output for LDO5 (RX) (when shut down, pulled down with 10kΩ)

10

OUT4

Output for LDO4 (TX) (when shut down, pulled down with 10kΩ)

11

AVIN2

Analog voltage input. Must be tied to BAT on the PCB.

12

OUT3

Output for LDO3 (TCXO)

13

OUT2

Output for LDO2 (PowerAnalog)

14

AVIN1

Analog voltage input. Must be tied to BAT on the PCB.

15

OUT1

Output for LDO1 (PowerDigital)

16

AGND

Signal ground

17

CNOISE

Noise Bypass pin for the internal reference voltage. Connect a 0.01μF capacitor to AGND.

18

RESET

RESET is the open drain output of a 50ms reset timer. RESET is released after the 50ms timer times out.

RESET is active low and is held low during shutdown. RESET should be tied to a 10K or larger pullup to

OUTBUCK.

19

ADPP

Interface and Programmability section)

20

LX

Step-down Buck converter (Core) switching node. Connect an inductor between this pin and the output.

21

PGND

Power Ground for step-down Buck converter (Core)

22

PVIN

Input power for step-down Buck converter (Core). Must be tied to BAT.

23

OUTBUCK

Feedback input for the step-down Buck converter (Core)

24, 25

N/C

No Connect; do not connect anything to these pins.

26, 27

BAT

Connect to a Lithium Ion battery.

28, 29

CHGIN

Power input from either external adapter or USB port.

30

ENBAT

Active low enable for the battery charger (Internally pulled low when floating)

31

TS

Battery Temperature Sense pin with 75μA output current. Connect the battery’s NTC resistor to this pin and

ground.

32

ISET

Charge current programming input pin (Tie a 1k to GND for maximum fast charge current). Can be used to

monitor charge current.

33

CT

Charger Safety Timer Pin. A 0.1μF ceramic capacitor should be connected between this pin and GND. Con-

nect directly to GND to disable the timer function.

34

STAT

Battery charging status pin output. Connected internally between GND and OUT1 (PowerDigital). Used to

monitor battery charge status.

35

SDA

36

SCL

EP

EP

The exposed thermal pad (EP) must be connected to board ground plane and pins 16 and 21. The ground

plane should include a large exposed copper pad under the package for thermal dissipation (see package

outline).