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Teilenummer | AAT2552 |
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Beschreibung | Total Power Solution | |
Hersteller | AAT | |
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Gesamt 30 Seiten www.DataSheet4U.com
AAT2552
Total Power Solution for Portable Applications
General Description
Features
SystemPower™
The AAT2552 is a fully integrated 500mA battery
charger, a 300mA step-down converter, and a
300mA low dropout (LDO) linear regulator. The
input voltage range is 4V to 6.5V for the battery
charger and 2.7V to 5.5V for the step-down con-
verter and linear regulator, making it ideal for appli-
cations operating with single-cell lithium-ion/poly-
mer batteries.
The battery charger is a complete constant cur-
rent/constant voltage linear charger. It offers an
integrated pass device, reverse blocking protec-
tion, high accuracy current and voltage regulation,
charge status, and charge termination. The charg-
ing current is programmable via external resistor
from 30mA to 500mA. In addition to these stan-
dard features, the device offers over-voltage, cur-
rent limit, and thermal protection.
The step-down converter is a highly integrated
converter operating at a 1.5MHz switching fre-
quency, minimizing the size of external compo-
nents while keeping switching losses low. The out-
put voltage ranges from 0.6V to the input voltage.
The AAT2552 linear regulator is designed for high
speed turn-on and turn-off performance, fast tran-
sient response, and good power supply ripple
rejection. Delivering up to 300mA of load current,
it includes short-circuit protection and thermal
shutdown.
The AAT2552 is available in a Pb-free, thermally-
enhanced TDFN34-16 package and is rated over
the -40°C to +85°C temperature range.
Typical Application
• Battery Charger:
— Input Voltage Range: 4V to 6.5V
— Programmable Charging Current up to
500mA
— Highly Integrated Battery Charger
• Charging Device
• Reverse Blocking Diode
• Current Sensing
• Step-Down Converter:
— Input Voltage Range: 2.7V to 5.5V
— Output Voltage Range: 0.6V to VIN
— 300mA Output Current
— Up to 96% Efficiency
— 45µA Quiescent Current
— 1.5MHz Switching Frequency
— 120µs Start-Up Time
• Linear Regulator:
— 300mA Output Current
— Low Dropout: 400mV at 300mA
— Fast Line and Load Transient Response
— High Accuracy: ±1.5%
— 85µA Quiescent Current
• Short-Circuit, Over-Temperature, and Current
Limit Protection
• TDFN34-16 Package
• -40°C to +85°C Temperature Range
Applications
• Bluetooth® Headsets
• Cellular Phones
• GPS
• Handheld Instruments
• MP3 and Portable Music Players
• PDAs and Handheld Computers
• Portable Media Players
Adapter/USB Input
Enable
VOUTB
COUTB
4.7μF
RFBB1
RFBB2
VOUTA
COUTA
ADP
INB
STAT
ENB
EN_BAT
INA
L1 ENA
LX AAT2552
RFBA1
RFBA2
FBB
OUTA
FBA
GND
MODE
BAT
ISET
COUT
R SET
BATT+
BATT-
Battery
Pack
2552.2007.04.1.0
1
AAT2552
Total Power Solution for Portable Applications
Electrical Characteristics1
VADP = 5V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Conditions
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
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
Enable Threshold High
Enable Threshold Low
Output Low Voltage
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
Pre-Charge Current
Charge Termination Threshold Current
Rising Edge
Charge Current = 200mA
VBAT = 4.25V, VEN_BAT = GND
VBAT = 4V, ADP Pin Open
Measured from VBAT_EOC
ICHARGE = 200mA
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
2.8 3.0 3.2
-0.1
V
V
V
30 500 mA
-10 10 %
2V
800
0.5 0.8 Ω
1.6 V
0.4 V
0.4 V
8 mA
4.4 V
10 %
10 %
1. The AAT2552 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.
6 2552.2007.04.1.0
6 Page AAT2552
Total Power Solution for Portable Applications
Typical Characteristics–Step-Down Converter
Load Transient Response
(10mA to 300mA; VIN = 3.6V; VOUT = 1.8V; COUT = 4.7µF; C = 100pF)
2.0
1.9 VOUT
1.8
1.7
1.6
IOUT 300mA
10mA
Line Transient Response
(VOUT = 1.8V @ 150mA, CFF = 100pF)
1.90
1.85
1.80
1.75
0.2
ILX
0.0
-0.2
Time (20µs/div)
Time (25µs/div)
4.6
4.1
3.6
3.1
Output Voltage Ripple
(VIN = 3.6V; VOUT = 1.8V; IOUT = 300mA)
1.81
1.80
1.79
0.4
0.3
0.2
0.1
Time (0.2µs/div)
Output Voltage Ripple
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1mA)
40
20
0
-20
Time (5µs/div)
0.05
0.00
-0.05
-0.10
12 2552.2007.04.1.0
12 Page | ||
Seiten | Gesamt 30 Seiten | |
PDF Download | [ AAT2552 Schematic.PDF ] |
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