AAT3601 Datasheet PDF - Advanced Analogic Technologies

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AAT3601
Advanced Analogic Technologies

Part Number AAT3601
Description Total Power Solution
Page 30 Pages


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PRODUCT DATASHEET
AAT3601178
Total Power Solution for Portable Applications
General Description
The AAT3601 is a member of AnalogicTech’s Total Power
wwMwa.dnaatagsehmeeet4nut.cIoCmTM (TPMICTM) product family. It contains a
single-cell Lithium Ion/Polymer battery charger, a fully
integrated step-down converter and 5 low dropout (LDO)
regulators. The device also includes 2 load switches for
dynamic power path/sleep mode operation, making it
ideal for small portable short-range communications
enabled mobile devices and telephones.
The battery charger is a complete thermally regulated
constant current/constant voltage linear charger. It
includes an integrated pass device, reverse blocking pro-
tection, high accuracy current and voltage regulation,
charge status, and charge termination. The charging
current and the charge termination current as well as
recharge voltage are programmable with either an exter-
nal resistor and/or by a standard I2C interface.
The step-down DC/DC converter is integrated with inter-
nal compensation and operates at a switching frequency
of 1.5MHz, thus minimizing the size of external compo-
nents while keeping switching losses low and efficiency
greater than 95%. All LDO output voltages are program-
mable using the I2C interface.
The five LDOs offer 60dB power supply rejection ratio
(PSRR) and low noise operation making them suitable for
powering noise-sensitive loads. The LDOs and DC/DC
converter are separated into Permanent-Enabled (PE)
and Non-Permanent (NP) enabled supplies.
All six voltage regulators operate with low quiescent cur-
rent. The total no load current when the 3 PE LDOs are
enabled is only 200μA.
The device includes a watchdog timer input and two
reset outputs for the watchdog and LDO regulation. The
device also can be programmed through a standard I2C
interface.
The AAT3601 is available in a thermally enhanced low
profile 5x5x0.8mm 36-pin TQFN package.
Features
Voltage Regulator VIN Range: 4.5V to 6V
• Complete Power Integration
Integrated Load Switches to Power Converters from
AC Adapter or Battery Automatically
• Low Standby Current
200μA (typ) w/LDO1, LDO2 and LDO5 Active,
No Load
• One Step-Down Buck Converter (NP)
1.24V, 300mA Output
1.5MHz Switching Frequency
Fast Turn-On Time (120μs typ)
Five LDOs Programmable by I2C
LDO1: 3.4V, 150mA (PE)
LDO2: 3.4V, 300mA (NP)
LDO3: 1.24V, 300mA (PE)
LDO4: 1.85V, 300mA (NP)
LDO5: 1.85V, 300mA (PE)
PSRR: 60dB @10kHz
Noise: 50μVrms
• One Battery Charger
Digitized Thermal Regulation
Charge Current Programming up to 1.4A
Charge Current Termination Programming
Automatic Trickle Charge for Battery Preconditioning
(2.8V Cutoff)
• Watchdog (WDI) Timer Input
Two Reset (RSTIN, RSTLPW) Timer Outputs
• Separate Enable Pins for PE and NP Supplies
Digital Programming of Major Parameters via I2C
• Over-Current Protection
• Over-Temperature Protection
• 5x5mm TQFN55-36 Package
Applications
• Digital Cameras
• GSM or CDMA Cellular Phones
• Handheld Instruments
• PDAs and Handheld Computers
• Portable Media Players
• Short-Range Communication Headsets
3601.2008.02.1.0
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Typical Application
To AVIN1,AVIN2, PVIN
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SYSOUT
System Supply
500mΩ
CHGIN
5V from
AC Adapter or USB Port
10μF
To
SYSOUT
100k
STAT
STAT_BAT
ENBAT
To USE_USB
SYSOUT
100k SDA
100k SCL
WDI
μC
TEMP_FLAG
To
OUT1
To
OUT1
EN_SYS
RSTLPW
100k RSTIN
100k EN_PE
EN_NP
AVIN2
To SYSOUT
PRODUCT DATASHEET
AAT3601178
Total Power Solution for Portable Applications
SYSOUT
LDO
Charger
Control
Ref
I2C
and
Enable/Reset
Control
UVLO
100mΩ
BAT
10μF
+ 1 cell
- Li+
battery
VIN
Step-down
Ref BUCK
Enable
VIN
REF
TS
CT
0.1μF
ISET
10kΩ
NTC
For BAT
Temp sense
1.24k
To SYSOUT
PVIN
LX 2.2μH
NP 1.24V
300mA
10μF
OUTBUCK
PGND
4.7μF
CNOISE
AVIN1
To SYSOUT
0.01μF
AGND
OUT5
PE
1.85V, 300mA
10μF
OUT4
NP
1.85V, 300mA
OUT3
OUT2
PE
1.24V, 300mA
NP
3.4V, 300mA
10μF
10μF
10μF
OUT1
PE
3.4V, 150mA
22μF
2
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PRODUCT DATASHEET
AAT3601178
Total Power Solution for Portable Applications
Pin Descriptions
Pin # Symbol
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1 WDI
2 TEMP_FLAG
3 EN_SYS
4 STAT_BAT
5 EN_PE
6 EN_NP
7 SGND
8 SGND
9 OUT5
10 OUT4
11 AVIN2
12 OUT3
13 OUT2
14 AVIN1
15 OUT1
16 AGND
17 CNOISE
18 RSTLPW
19
20
21
22
23
24, 25
26, 27
28
29
30
31
32
33
34
35
36
RSTIN
LX
PGND
PVIN
OUTBUCK
SYSOUT
BAT
CHGIN
USE_USB
ENBAT
TS
ISET
CT
STAT
SDA
SCL
EP 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 lter 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 oating)
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).
3601.2008.02.1.0
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Pin Configuration
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PRODUCT DATASHEET
AAT3601178
Total Power Solution for Portable Applications
TQFN55-36
(Top View)
36 35 34 33 32 31 30 29 28
WDI
TEMP_FLAG
EN_SYS
STAT_BAT
EN_PE
EN_NP
SGND
SGND
OUT5
1
2
3
4
5
6
7
8
9
27 BAT
26 BAT
25 SYSOUT
24 SYSOUT
23 OUTBUCK
22 PVIN
21 PGND
20 LX
19 RSTIN
10 11 12 13 14 15 16 17 18
4
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