AAT2557ITO-CT-T1 AnalogicTech, AAT2557ITO-CT-T1 Datasheet
AAT2557ITO-CT-T1
Related parts for AAT2557ITO-CT-T1
AAT2557ITO-CT-T1 Summary of contents
Page 1
General Description The AAT2557 is a fully integrated 500mA battery charger and a 300mA low dropout (LDO) linear regulator. The input voltage range 6.5V for the battery charger and 2.7V to 5.5V for the linear regulator, making ...
Page 2
Pin Descriptions Pin # Symbol Function 1 ENLDO Enable pin for the linear regulator. When connected to logic low, the regulator is dis- abled and consumes less than 1µA of current. When connected to logic high, it resumes normal operation. ...
Page 3
Absolute Maximum Ratings Symbol Description V Input Voltage to GND INLDO V Adapter Voltage to GND ADP V ENLDO, EN_BAT Voltage to GND EN V BAT, ISET, STAT Voltage to GND X V BYP Voltage to GND BYP T Operating ...
Page 4
Electrical Characteristics for V INLDO OUT(NOM) OUT T = -40°C to +85°C, unless otherwise noted. Typical values are T A Symbol Description Linear Regulator V Output Voltage Tolerance OUT V Input Voltage ...
Page 5
Electrical Characteristics -40°C to +85°C, unless otherwise noted. Typical values are T ADP A Symbol Description Battery Charger Operation V Adapter Voltage Range ADP Under-Voltage Lockout (UVLO) V UVLO UVLO Hysteresis I Operating Current OP ...
Page 6
Typical Characteristics – Battery Charger Constant Charging Current vs. Set Resistor Values 1000 100 (kΩ Ω SET End of Charge Battery Voltage vs. Supply Voltage 4.206 4.204 R SET 4.202 4.200 R SET 4.198 ...
Page 7
Typical Characteristics – Battery Charger Operating Current vs. Temperature = 8.06kΩ Ω SET 550 500 450 400 350 300 -50 - Temperature (°C) Preconditioning Charge Current vs. Temperature = 8.06kΩ Ω SET 20.8 20.6 ...
Page 8
Typical Characteristics – Battery Charger V vs. Supply Voltage EN(H) = 8.06kΩ Ω SET 1.2 1.1 -40°C 1 0.9 25°C 0.8 0.7 4 4.25 4.5 4.75 5 5.25 5.5 V (V) ADP 8 500mA Battery Charger and 300mA ...
Page 9
Typical Characteristics – LDO Regulator Dropout Voltage vs. Temperature 540 I = 300mA 480 L 420 360 300 I = 100mA I = 150mA L 240 L 180 120 60 0 -40 -30 -20 - ...
Page 10
Typical Characteristics – LDO Regulator LDO Initial Power-Up Response Time Time (50µs/div) Turn-Off Response Time (I = 100mA) OUT 5 0 Time (5µs/div) Load Transient Response (V = 2.8V) OUT 2.90 2.85 V ...
Page 11
Typical Characteristics – LDO Regulator V and V EN(L) EN(H) 1.250 1.225 1.200 V 1.175 EN(H) 1.150 1.125 V 1.100 EN(L) 1.075 1.050 2.5 3.0 3.5 4.0 Input Voltage (V) 2557.2007.06.1.0 500mA Battery Charger and 300mA LDO Regulator for Portable ...
Page 12
Functional Block Diagram ADP Constant ISET Current STAT Temperature Protection INLDO OUTLDO Functional Description The AAT2557 is a high performance power man- agement IC comprised of a lithium-ion/polymer battery charger and a linear regulator. The linear regulator is designed for ...
Page 13
Linear Regulator The advanced circuit design of the linear regulator has been specifically optimized for very fast start- up. This proprietary CMOS LDO has also been tai- lored for superior transient response characteris- tics. These traits are particularly important for ...
Page 14
Battery Charging Operation Battery charging commences only after checking several conditions in order to maintain a safe charg- ing environment. The input supply (ADP) must be above the minimum operating voltage (UVLO) and the enable pin must be high (internally ...
Page 15
Battery Charging System Operation Flow Chart No Shut Down No Recharge Test V > V RCH BAT 2557.2007.06.1.0 500mA Battery Charger and 300mA LDO Regulator for Portable Systems Enable Yes Power Input Voltage V > V ADP UVLO Yes Fault ...
Page 16
Application Information Soft Start / Enable The EN_BAT pin is internally pulled down. When pulled to a logic high level, the battery charger is enabled. When left open or pulled to a logic low level, the battery charger is shut ...
Page 17
Event Description No battery charging activity Battery charging via adapter or USB port Charging completed Table 2: LED Status Indicator. The LED should be biased with as little current as necessary to create reasonable illumination; there- fore, a ballast resistor ...
Page 18
By substitution, we can derive the maximum charge current before reaching the thermal limit condition (thermal cycling). The maximum charge current is the key factor when designing battery charger applications D(MAX ...
Page 19
C be reduced. In applications where low noise performance and/or ripple rejection are less of a concern, the bypass capacitor may be omitted. The fastest device turn-on time will be realized when no ...
Page 20
Manufacturer Part Number Murata GRM21BR61A106KE19 Murata GRM188R60J475KE19 Murata GRM188R61A225KE34 Murata GRM188R60J225KE19 Murata GRM188R61A105KA61 Murata GRM185R60J105KE26 Murata GRM188F51H103ZA01 Murata GRM155F51H103ZA01 20 500mA Battery Charger and 300mA LDO Regulator for Portable Systems Value (µF) 10 4.7 2.2 2.2 1.0 1.0 0.01 0.01 ...
Page 21
... Code 1.2 E 1.5 G 1.8 I 1.9 Y 2.5 N 2.6 O 2.7 P 2.8 Q 2.85 R 2.9 S 3.0 T 3 XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 2557.2007.06.1.0 500mA Battery Charger and 300mA LDO Regulator for Portable Systems Marking 1 Part Number (Tape and Reel) VKXYY AAT2557 2 AAT2557ITO-CT-T1 21 ...
Page 22
... AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service with- out notice. Except as provided in AnalogicTech’ ...