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AAT2550 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT2550
Beschreibung Total Power Solution
Hersteller AAT
Logo AAT Logo 




Gesamt 30 Seiten
AAT2550 Datasheet, Funktion
AAT2550
Total Power Solution for Portable Applications
General Description
Features
SystemPower
The AAT2550 is a fully integrated total power solu-
• Two Step-Down Converters:
tion with two step-down converters plus a single-
— 600mA Output Current per Converter
cell lithium-ion / polymer battery charger. The step-
down converter input voltage range spans 2.7V to
— VIN Range: 2.7V to 5.5V
— 1.4MHz Switching Frequency
5.5V, making the AAT2550 ideal for systems pow-
ered by single-cell lithium-ion/polymer batteries.
— Low RDS(ON) 0.4Ω Integrated Power
Switches
The battery charger is a complete constant current/
constant voltage linear charger. It offers an inte-
grated pass device, reverse blocking protection,
high current accuracy and voltage regulation,
charge status, and charge termination. The charg-
ing current is programmable via external resistor
from 100mA to 1A. In addition to these standard
features, the device offers over-voltage, over-cur-
rent, and thermal protection.
— Internal Soft Start
— 27µA Quiescent Current per Converter
• Highly Integrated Battery Charger:
— Programmable Charging Current from
100mA to 1A
— Pass Device
— Reverse Blocking Diodes
— Current Sensing Resistor
— Digital Thermal Regulation
• Short-Circuit, Over-Temperature, and Current
The two step-down converters are highly integrated,
Limit Protection
operating at a switching frequency of 1.4MHz, mini-
• QFN44-24 Package
mizing the size of external components while keep-
• -40°C to +85°C Temperature Range
ing switching losses low. Each converter has inde-
pendent input, enable, and feedback pins. The out-
put voltage ranges from 0.6V to VIN.
is capable of delivering up to 600mA
Each converter
www.DataSheet4U.com
of load current.
Applications
The AAT2550 is available in a Pb-free, space-sav-
ing, thermally-enhanced QFN44-24 package and is
rated over the -40°C to +85°C temperature range.
• Cellular Telephones
• Digital Cameras
• Handheld Instruments
• MP3, Portable Music, and Portable Media
Players
• PDAs and Handheld Computers
Typical Application
Adapter
Serial Interface
RSET
Li-Ion Battery or
Adapter
ADP
BAT
AAT2550
STAT1
STAT2
DATA
ADPSET
TS
CT
ENBAT
INA
INB
ENA
ENB
GND
LXA
FBA
LXB
FBB
Battery Pack
Batt+
Batt-
Temp
V OUTA
COUTA
VOUTB
COUTB
2550.2006.07.1.0
1






AAT2550 Datasheet, Funktion
AAT2550
Total Power Solution for Portable Applications
Typical Characteristics—Step-Down Converter
Efficiency vs. Load
(VOUT = 1.8V; L = 4.7μH)
100
VIN = 2.7V
90
80 VIN = 3.6V VIN = 4.2V
70
60
1.0
0.5
0.0
-0.5
50
0.1
1 10 100
Output Current (mA)
1000
-1.0
0.1
DC Regulation
(VOUT = 1.8V)
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
1 10 100 1000
Output Current (mA)
Efficiency vs. Load
(VOUT = 2.5V; L = 6.8μH)
100
VIN = 2.7V
90
80 VIN = 5.0V
VIN = 4.2V
70 VIN = 3.6V
60
50
0.1
1 10 100
Output Current (mA)
1000
1.0
0.5
0.0
-0.5
-1.0
0.1
DC Regulation
(VOUT = 2.5V)
VIN = 4.2V
VIN = 5.0V
VIN = 3.6V
VIN = 3.0V
1 10 100
Output Current (mA)
1000
Efficiency vs. Load
(VOUT = 3.3V; L = 6.8μH)
100
VIN = 3.6V
90
VIN = 4.2V
80
VIN = 5.0V
70
60
50
0.1
1 10 100
Output Current (mA)
1000
1.0
0.5
0.0
-0.5
-1.0
0.1
DC Regulation
(VOUT = 3.3V; L = 6.8µH)
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
1 10 100
Output Current (mA)
1000
6 2550.2006.07.1.0

6 Page









AAT2550 pdf, datenblatt
AAT2550
Total Power Solution for Portable Applications
Typical Characteristics—Battery Charger
CT Pin Capacitance vs. Counter Timeout
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
Precondition Timeout
Precondition + Constant Current Timeout
or Constant Voltage Timeout
2 4 6 8 10
Time (hours)
Temperature Sense Output Current
vs. Temperature
88
86
84
82
80
78
76
74
72
-50
-25
0
25 50 75 100
Temperature (°C)
12 2550.2006.07.1.0

12 Page





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