AAT2601B Datasheet, PDF (3/39 Pages) Skyworks Solutions Inc. – Total Power Solution for Portable Applications

DATA SHEET
AAT2601B
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
EN_TEST
EN_HOLD
EN_KEY
ON_KEY
EN2
EN3
EN4
EN5
OUT5
OUT4
AVIN2
OUT3
OUT2
AVIN1
OUT1
AGND
CNOISE
RESET
ADPP
LX
PGND
PVIN
OUTBUCK
SYSOUT
BAT
CHGIN
USE_USB
ENBAT
TS
ISET
CT
STAT
SDA
SCL
EP
Function
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.
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.
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.
Buffered logic output of the EN_KEY pin with a logic signal from ground to OUT1.
Enable for LDO2 (Internally pulled low when floating).
Enable for LDO3 (Internally pulled low when floating).
Enable for LDO4 (Internally pulled low when floating).
Enable for LDO5 (Internally pulled low when floating).
Output for LDO5 (when shut down, pulled down with 10k)
Output for LDO4 (when shut down, pulled down with 10k)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO3.
Output for LDO2.
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO1.
Signal ground.
Noise Bypass pin for the internal reference voltage. Connect a 0.01μF capacitor to AGND.
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.
Open Drain output. Will pull low when V_CHGIN > 4.5V. When this happens, depending on the status of the
USE_USB pin, the charge current will be reset to the default values (see Battery Charger and I²C Serial
Interface and Programmability section)
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 (Tie a 1.24k to GND for 800mA fast charge current). Can be used to
monitor charge current.
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.
Battery charging status pin output. Connected internally between GND and OUT1. Used to monitor battery
charge 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).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202181B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
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