AAT3601_08 Datasheet, PDF (3/37 Pages) Advanced Analogic Technologies – Total Power Solution for Portable Applications

PRODUCT DATASHEET
AAT3601178
Total Power Solution for Portable Applications
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24, 25
26, 27
28
29
30
31
32
33
34
35
36
EP
Symbol
WDI
TEMP_FLAG
EN_SYS
STAT_BAT
EN_PE
EN_NP
SGND
SGND
OUT5
OUT4
AVIN2
OUT3
OUT2
AVIN1
OUT1
AGND
CNOISE
RSTLPW
RSTIN
LX
PGND
PVIN
OUTBUCK
SYSOUT
BAT
CHGIN
USE_USB
ENBAT
TS
ISET
CT
STAT
SDA
SCL
EP
Function
Watchdog timer input. Clock input from processor. If no clock input is detected for 60ms, it will reset
RSTIN.
Open drain output which pulls low when an over temperature shutdown occurs in the regulator or the char-
ger and when the thermal loop in the charger is activated.
Active Low Enable for the system. An internal pull-up resistor (150kΩ) 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. To filter noise internally, there is an internal 100μs debounce delay circuit.
Open Drain Output for Battery Charger Status. Same function as STAT pin but with opposite polarity.
Active Low Enable for Permanently-Enabled Supplies: LDO1, LDO3, and LDO5. (This pin is internally pulled
low with 250nA)
Active High Enable for Non-Permanent Supplies: Buck, LDO2, and LDO4 (This pin is internally pulled low
with 250nA)
Signal ground
Signal ground
Output for LDO5 (when disabled, this pin is pulled down with 10kΩ)
Output for LDO4 (when disabled, this pin is pulled down with 10kΩ)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO3 (when disabled, this pin is pulled down with 10kΩ)
Output for LDO2 (when disabled, this pin is pulled down with 10kΩ)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO1 (when disabled, this pin is pulled down with 10kΩ)
Signal ground
Noise Bypass pin for the internal reference voltage. Connect a 0.01μF capacitor to AGND.
Open Drain Reset output. Pulled low internally when any Permanent Supply (LDO1, LDO3, LDO5) are not in
regulation. Releases High 800ms (typ) after all supplies are in regulation.
Open Drain Reset output. Pulled low internally when any Non-Permanent Supply (Buck, LDO2, or LDO4) are
not in regulation. Releases High 10ms (typ) after all supplies are in regulation.
Step-down Buck converter switching node. Connect an inductor between this pin and the output.
Power Ground for step-down Buck converter.
Input power for step-down Buck converter. Must be tied to SYSOUT.
Feedback input for the step-down Buck converter.
System Power output. Connect to the input voltage pins PIN, AVIN1/2 for the step-down converter and LDOs
and other external supply requirements.
Connect to a Lithium-Ion Battery.
Power input from either external Adapter or USB port.
When pulled high, fast charge current is set to 100mA regardless of the resistor value present on the ISET pin.
Additionally, the CHGIN-SYSOUT LDO will be disabled and the BAT-SYSOUT load switch will be enabled.
Active low enable for the battery charger (Internally pulled low when floating)
Battery Temperature Sense pin with 75μA output current. Connect the battery’s NTC resistor to this pin
and ground.
Charge current programming input pin. Can be used to monitor charge current.
Charger Safety Timer Pin. A 0.1μF ceramic capacitor should be connected between this pin and GND.
Connect directly to GND to disable the timer function.
Open drain output for battery charging status.
I²C serial Data pin, open drain; requires a pullup resistor.
I²C serial Clock pin, open drain; requires a pullup resistor.
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).
3601.2008.07.1.1
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