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AAT2552 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT2552
Beschreibung Total Power Solution
Hersteller AAT
Logo AAT Logo 




Gesamt 30 Seiten
AAT2552 Datasheet, Funktion
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 Datasheet, Funktion
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 pdf, datenblatt
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





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