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PDF AAT2556 Data sheet ( Hoja de datos )
| Número de pieza | AAT2556 | |
| Descripción | Battery Charger and Step-Down Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
General Description
Features
SystemPower™
The AAT2556 is a member of AnalogicTech's Total
• Battery Charger:
Power Management IC™ (TPMIC™) product fam-
— Input Voltage Range: 4V to 6.5V
ily. It is a fully integrated 500mA battery charger
— Programmable Charging Current up to
plus a 250mA step-down converter. The input volt-
500mA
age range is 4V to 6.5V for the battery charger and
— Highly Integrated Battery Charger
2.7V to 5.5V for the step-down converter, making it
— Charging Device
ideal for single-cell lithium-ion/polymer battery-
— Reverse Blocking Diode
powered applications.
• Step-Down Converter:
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 15mA to 500mA. In addition to standard fea-
tures, the device offers over-voltage, current limit,
and thermal protection.
— Input Voltage Range: 2.7V to 5.5V
— Output Voltage Range: 0.6V to VIN
— 250mA Output Current
— Up to 96% Efficiency
— 30µA Quiescent Current
— 1.5MHz Switching Frequency
— 100µs Start-Up Time
• Short-Circuit, Over-Temperature, and Current
Limit Protection
• TDFN33-12 Package
The step-down converter is a highly integrated
• -40°C to +85°C Temperature Range
converter operating at 1.5MHz of switching fre-
quency, minimizing the size of external compo-
nents while keeping switching losses low. It has
www.DataSheet4U.com
Applicationsindependent input and enable pins. The output
voltage ranges from 0.6V to the input voltage. The
feedback and control deliver excellent load regula-
• Bluetooth™ Headsets
tion and transient response with a small output
• Cellular Phones
inductor and capacitor.
• Handheld Instruments
The AAT2556 is available in a Pb-free, thermally-
enhanced TDFN33-12 package and is rated over
the -40°C to +85°C temperature range.
• MP3 and Portable Music Players
• PDAs and Handheld Computers
• Portable Media Players
Typical Application
Adapter / USB Input
ADP
VIN
Enable
VOUT
COUT
STAT
EN_BUCK
L= 3.3µH
RFB1
RFB2
EN_BAT
BAT
LX
ISET
FB
GND
RSET
BATT +
C
BATT -
2556.2006.05.1.0
1
1 page  
AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Electrical Characteristics1
VADP = 5V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Battery Charger
Operation
VADP
VUVLO
Adapter Voltage Range
Under-Voltage Lockout (UVLO)
UVLO Hysteresis
IOP Operating Current
ISHUTDOWN Shutdown Current
ILEAKAGE
Reverse Leakage Current from BAT Pin
Voltage Regulation
VBAT_EOC
End of Charge Accuracy
ΔVCH/VCH Output Charge Voltage Tolerance
VMIN
Preconditioning Voltage Threshold
VRCH
Battery Recharge Voltage Threshold
Current Regulation
ICH Charge Current Programmable Range
ΔICH/ICH Charge Current Regulation Tolerance
VSET
ISET Pin Voltage
KI_A Current Set Factor: ICH/ISET
Charging Devices
RDS(ON)
Charging Transistor On Resistance
Logic Control/Protection
VEN(H)
VEN(L)
VSTAT
ISTAT
VOVP
ITK/ICHG
ITERM/ICHG
Input High Threshold
Input Low Threshold
Output Low Voltage
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
Pre-Charge Current
Charge Termination Threshold Current
Conditions
Rising Edge
Charge Current = 200mA
VBAT = 4.25V, EN = GND
VBAT = 4V, ADP Pin Open
Measured from VBAT_EOC
VADP = 5.5V
STAT Pin Sinks 4mA
ICH = 100mA
Min Typ Max Units
4.0 6.5 V
3 4V
150 mV
0.5 1 mA
0.3 1 µA
0.4 2 µA
4.158 4.20 4.242
0.5
2.85 3.0 3.15
-0.1
V
%
V
V
15 500 mA
10 %
2V
800
0.9 1.1
Ω
1.6 V
0.4 V
0.4 V
8 mA
4.4 V
10 %
10 %
1. The AAT2556 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -25°C to +85°C
temperature range is guaranteed by design.
2556.2006.05.1.0
5
5 Page 
AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Typical Characteristics – Battery Charger
VEN(H) vs. Supply Voltage
(RSET = 8.06kΩ)
1.2
1.1
-40°C
1
VEN(L) vs. Supply Voltage
(RSET = 8.06kΩ)
1.1
1 -40°C
0.9
0.9 0.8
0.8
25°C
85°C
0.7
25°C
85°C
0.7
4
4.25 4.5 4.75
5 5.25 5.5
VADP (V)
5.75
6
6.25 6.5
0.6
4
4.25 4.5 4.75
5 5.25 5.5 5.75
VADP (V)
6
6.25 6.5
2556.2006.05.1.0
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet AAT2556.PDF ] | |
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