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Teilenummer | AAT2550 |
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Beschreibung | Total Power Solution | |
Hersteller | AAT | |
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Gesamt 30 Seiten 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
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
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 | ||
Seiten | Gesamt 30 Seiten | |
PDF Download | [ AAT2550 Schematic.PDF ] |
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