REV. 0

ADP3408

–5–

*RU = Thin Shrink Small Outline

PIN FUNCTION DESCRIPTIONS

Pin

Mnemonic

Function

1

PWRONIN

Power On/Off Signal from

Microprocessor

2

PWRONKEY

Power-On/-Off Key

3

ROWX

Power Key Interface Output

4

SIMEN

SIM LDO Enable

5

VRTCIN

RTC LDO Input Voltage

6

VRTC

Real-Time Clock Supply/

Coin Cell Battery Charger

7

BATSNS

Battery Voltage Sense Input

8

MVBAT

Divided Battery Voltage Output

9

CHRDET

Charge Detect Output

10

CHRIN

Charger Input Voltage

11

GATEIN

Microprocessor Gate Input

Signal

12

GATEDR

Gate Drive Output

13

DGND

Digital Ground

14

ISENSE

Charge Current Sense Input

15

EOC

End of Charge Signal

16

CHGEN

Charger Enable for GATEIN,

NiMH Pulse Charging

17

RESCAP

Reset Delay Time

18

RESET

Main Reset

19

VSIM

SIM LDO Output

20

VBAT2

Battery Input Voltage 2

21

VMEM

Memory LDO Output

22

VCORE

Digital Core LDO Output

23

VBAT

Battery Input Voltage

24

VAN

Analog LDO Output

25

VTCXO

TCXO LDO Output

26

REFOUT

Output Reference

27

AGND

Analog Ground

28

TCXOEN

TCXO LDO Enable and

MVBAT Enable

PIN CONFIGURATION

TOP VIEW

(Not to Scale)

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

ADP3408

ISENSE

DGND

GATEDR

GATEIN

CHRIN

CHRDET

MVBAT

PWRONIN

PWRONKEY

ROWX

SIMEN

BATSNS

VRTC

VRTCIN

EOC

CHGEN

RESCAP

RESET

VSIM

VBAT2

VMEM

TCXOEN

AGND

REFOUT

VTCXO

VCORE

VBAT

VAN

ABSOLUTE MAXIMUM RATINGS

*

Voltage on any pin with respect to

any GND Pin . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +10 V

Voltage on any pin may not exceed VBAT, with the following

exceptions: CHRIN, GATEDR, ISENSE

Storage Temperature Range . . . . . . . . . . . . . –65

°C to +150°C

Operating Ambient Temperature Range . . . . . –20

°C to +85°C

Maximum Junction Temperature . . . . . . . . . . . . . . . . . 125

°C

4-Layer PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

°C/W

1-Layer PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

°C/W

Lead Temperature Range (Soldering, 60 sec.) . . . . . . . . 300

°C

*This is a stress rating only; operation beyond these limits can cause the device

to be permanently damaged.

ORDERING GUIDE

Core LDO

Output

Temperature

Package

Model

Voltage

Range

Option

*

ADP3408ARU-2.5 2.5 V

–20

°C to +85°C RU-28

ADP3408ARU-1.8 1.8 V

–20

°C to +85°C RU-28

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection. Although

the ADP3408 features proprietary ESD protection circuitry, permanent damage may occur on

devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are

recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE