AAT2601 Datasheet PDF - Advanced Analogic Technologies

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AAT2601
Advanced Analogic Technologies

Part Number AAT2601
Description Total Power Solution
Page 30 Pages


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PRODUCT DATASHEET
AAT2601178
Total Power Solution for Portable Applications
General Description
The AAT2601 is a member of AnalogicTech’s Total Power
Management ICTM (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 handheld portable GSM or CDMA mobile
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, charge termination current, and recharge volt-
age are programmable with an external resistor and/or
by a standard I2C interface.
The step-down DC/DC converter is integrated with internal
compensation and operates at a switching frequency of
1.5MHz, thus minimizing the size of external components
while keeping switching losses low and efficiency greater
than 95%. All LDO output voltages are programmable
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.
All six voltage regulators operate with low quiescent cur-
rent. The total no load current when the step-down con-
verter and 2 LDOs are enabled is only 170μA.
The AAT2601 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
170μA (typ) w/ Buck (Core), LDO1 (PowerDigital),
and LDO2 (PowerAnalog) Active, No Load
• One Step-Down Buck Converter (Core)
1.8V, 300mA Output
1.5MHz Switching Frequency
Fast Turn-On Time (120μs typ)
Five LDOs Programmable with I2C
LDO1: 3.0V, 300mA (PowerDigital)
LDO2: 3.0V, 150mA (PowerAnalog or PLL)
LDO3: 3.0V, 150mA (TCXO)
LDO4: 3.0V, 150mA (TX)
LDO5: 3.0V, 150mA (RX)
PSRR: 60dB@10kHz
Noise: 50μVrms for LDO3, LDO4, and LDO5
• 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)
Adapter OK (ADPP) and Reset (RESET) Timer Outputs
• Separate Enable Pins for Supply Outputs
• 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
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Typical Application
To AVIN1,AVIN2, PVIN
SYSOUT
System
Supply
500mΩ
CHGIN
5V from
AC Adapter or USB Port
10μF
To SYSOUT
100k
ADPP
STAT
ENBAT
To
SYSOUT
To
SYSOUT
USE_USB
100k
SDA
100k
SCL
EN_TEST
μC
EN_HOLD
EN_KEY
ON_KEY
RESET
To OUT1 100k EN2
EN3
EN4
EN5
AVIN2
To SYSOUT
PRODUCT DATASHEET
AAT2601178
Total Power Solution for Portable Applications
SYSOUT
LDO
Charger
Control
Ref
I2C
and
Enable
Control
UVLO
100mΩ
BAT
10μF
+ 1 cell
- Li+
battery
VIN
Step-down
Ref BUCK
Enable
TS
CT
0.1μF
ISET
10kΩ
NTC
For BAT
Temp sense
1.24k
To SYSOUT
PVIN
Core : 1.8V
LX 3.3μH
300mA
10μF
OUTBUCK
PGND
4.7μF
VIN
REF
CNOISE
AVIN1
To SYSOUT
0.01μF
AGND
OUT5
RX
3.0V
150mA
OUT4
TX
3.0V
150mA
4.7μF
OUT3
TCXO
3.0V
150mA
4.7μF
OUT2
PowerAnalog
3.0V
150mA
4.7μF
OUT1
PowerDigital
3.0V
300mA
4.7μF
22μF
2
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PRODUCT DATASHEET
AAT2601178
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 oating.
Enable for the system. EN_HOLD must be held high by the processor to maintain core power. It is inter-
nally pulled to GND when oating.
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 lter noise.
Buffered logic output of the EN_KEY pin with a logic signal from ground to OUT1.
Enable for LDO2 (PowerAnalog or PLL). (Internally pulled low when oating)
Enable for LDO3 (TCXO). (Internally pulled low when oating)
Enable for LDO4 (TX) (Internally pulled low when oating)
Enable for LDO5 (RX) (Internally pulled low when oating)
Output for LDO5 (RX) (when shut down, pulled down with 10kΩ)
Output for LDO4 (TX) (when shut down, pulled down with 10kΩ)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO3 (TCXO)
Output for LDO2 (PowerAnalog)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO1 (PowerDigital)
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 VCHGIN > 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 (Core) switching node. Connect an inductor between this pin and the output.
Power Ground for step-down Buck converter (Core)
Input power for step-down Buck converter (Core). Must be tied to SYSOUT.
Feedback input for the step-down Buck converter (Core)
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 (Tie a 1k to GND for maximum 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 (PowerDigital). 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).
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Pin Configuration
PRODUCT DATASHEET
AAT2601178
Total Power Solution for Portable Applications
TQFN55-36
(Top View)
EN_TEST
EN_HOLD
EN_KEY
ON_KEY
EN2
EN3
EN4
EN5
OUT5
1
2
3
4
5
6
7
8
9
36 35 34 33 32 31 30 29 28
27 BAT
26 BAT
25 SYSOUT
24 SYSOUT
23 OUTBUCK
22 PVIN
21 PGND
20 LX
19 ADPP
10 11 12 13 14 15 16 17 18
4
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