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PDF AAT2550 Data sheet ( Hoja de datos )
| Número de pieza | AAT2550 | |
| Descripción | Total Power Solution | |
| Fabricantes | AAT | |
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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
1 page  
AAT2550
Total Power Solution for Portable Applications
Electrical Characteristics1
VADP = 5V; TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
Battery Charger
VADP
VUVLO
Adapter Voltage Range
Under-Voltage Lockout
UVLO Hysteresis
IQ
ISLEEP
ILEAKAGE
ISHDN
VBAT_EOC2
ΔVCH/VCH
VMIN
VRCH
ICH
ΔICH/ICH
VADPSET
KIA
RDS(ON)
TC
TP
TV
VSTAT
ISTAT
VOVP
ITK/ICH
ITERM/ICH
ITS
Quiescent Current
Sleep Mode Current
Reverse Leakage Current
Shutdown Current
End of Charge Voltage Accuracy
Output Charge Voltage Tolerance
Preconditioning Voltage Threshold
Battery Recharge Voltage Threshold
Charge Current
Charge Current Regulation Tolerance
ADPSET Pin Voltage
Current Set Factor: ICH/IADPSET
Charger Pass Device
Constant Current Mode Time-Out
Preconditioning Time-Out
Constant Voltage Mode Time-Out
Output Low Voltage
STAT Sink Current
Over-Voltage Protection
Pre-Charge Current
Charge Termination Threshold Current
Current Source from TS Pin
TS1 TS Hot Temperature Fault
TS2
IDATA
VDATA(H)
VDATA(L)
SQPULSE
TPeriod
FDATA
TREG
TLOOP_IN
TLOOP_OUT
TSD
TS Cold Temperature Fault
DATA Pin Sink Current
Input High Threshold
Input Low Threshold
Status Request Pulse Width
System Clock Period
Data Output Frequency
Thermal Loop Regulation
Thermal Loop Entering Threshold
Thermal Loop Exiting Threshold
Over-Temperature Shutdown Threshold
Conditions
Min
Rising Edge
4.0
ICHARGE = 100mA
VBAT = 4.25V
VBAT = 4V, ADP Pin Open
VEN = GND
4.158
2.80
100
Constant Current Mode
VIN = 5.5V
CT = 100nF, VADP = 5.5V
CT = 100nF, VADP = 5.5V
CT = 100nF, VADP = 5.5V
ISINK = 4mA
0.20
Threshold
Hysteresis
Threshold
Hysteresis
DATA Pin is Active Low
70
310
2.2
3.0
1.6
200
Typ
3.0
150
0.75
0.3
1.0
4.2
0.5
3.0
VBAT_EOC - 0.1
10
2.0
4000
0.25
3.0
25
3.0
8.0
4.4
10
7.5
80
330
15
2.3
10
50
20
90
110
85
145
Max Units
5.5
3.0
1.0
1.0
4.242
3.15
1000
V
V
mV
mA
µA
µA
µA
V
%
V
V
mA
%
V
0.35 Ω
Hour
Minute
Hour
0.4 V
mA
V
%
%
90 µA
350 mV
2.4 V
mV
mA
V
0.4 V
ns
µs
kHz
°C
°C
°C
°C
1. The AAT2550 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. End of Charge Voltage Accuracy is specified over the 0° to 70°C ambient temperature range.
2550.2006.07.1.0
5
5 Page 
AAT2550
Total Power Solution for Portable Applications
Typical Characteristics—Battery Charger
Charging Current vs. Battery Voltage
(ADPSET = 8.06kΩ; VIN = 5.0V)
1.2
1.0
0.8
0.6
0.4
0.2
0.0
2.5
2.9 3.3 3.7 4.1
Battery Voltage (V)
4.5
Fast Charge Current vs. Supply Voltage
(ADPSET = 8.06kΩ)
1200
1000
VBAT = 3.3V
800
VBAT = 3.9V
600
VBAT = 3.5V
400
200
0
4.5 4.75 5.0 5.25 5.5 5.75 6.0
Supply Voltage (V)
VIH vs. Supply Voltage
EN Pin (Rising)
1.4
1.3
1.2
1.1
1.0
-40°C
+25°C
0.9
0.8
0.7
0.6 +85°C
0.5
0.4
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
Supply Voltage (V)
VIL vs. Supply Voltage
EN Pin (Falling)
1.4
1.3
1.2
1.1
1.0
-40°C
+25°C
0.9
0.8
0.7
0.6 +85°C
0.5
0.4
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
Supply Voltage (V)
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
1
Adapter Mode Supply Current
vs. ADPSET Resistor
Constant Current
Pre-Conditioning
10 100
ADPSET Resistor (kΩ)
1000
Counter Timeout vs. Temperature
(CT = 0.1μF)
10
8
6
4
2
0
-2
-4
-6
-8
-10
-50
-25
0 25 50
Temperature (°C)
75
100
2550.2006.07.1.0
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AAT2550.PDF ] | |
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