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Teilenummer | AAT2556 |
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Beschreibung | Battery Charger and Step-Down Converter | |
Hersteller | AAT | |
Logo | ||
Gesamt 29 Seiten 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
AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Typical Characteristics – Step-Down Converter
Efficiency vs. Load
(VOUT = 1.8V; L = 3.3µH)
100
VIN = 2.7V
90
VIN = 3.6V
80
VIN = 5.0V
70 VIN = 5.5V
60 VIN = 4.2V
50
40
0.1
1
10 100
Output Current (mA)
1000
DC Load Regulation
(VOUT = 1.8V; L = 3.3µH)
1.0
0.5
VIN = 3.6V
0.0
VIN = 2.7V
-0.5
VIN = 4.2V
VIN = 5.5V
VIN = 5.0V
-1.0
0.1
1 10 100
Output Current (mA)
1000
Efficiency vs. Load
(VOUT = 1.2V; L = 1.5µH)
100
90 VIN = 2.7V
80 VIN = 3.6V
70
60
50
40
30
0.1
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
1 10
100
Output Current (mA)
1000
DC Load Regulation
(VOUT = 1.2V; L = 1.5µH)
1.0
0.5 VIN = 5.0V
VIN = 5.5V
0.0
VIN = 3.6V
-0.5 VIN = 4.2V
VIN = 2.7V
-1.0
0.1 1
10 100
Output Current (mA)
1000
Soft Start
(VIN = 3.6V; VOUT = 1.8V;
IOUT = 250mA; CFF = 100pF)
5.0
4.0 VEN
3.0
2.0
1.0
0.0
-1.0 VO
-2.0
-3.0
-4.0 IL
-5.0
Time (100µs/div)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
Line Regulation
(VOUT = 1.8V)
0.6
0.5
0.4 IOUT = 0mA
0.3 IOUT = 50mA
0.2
0.1 IOUT = 150mA
0.0
-0.1
-0.2
IOUT = 10mA
IOUT = 250mA
-0.3
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
6 2556.2006.05.1.0
6 Page Functional Block Diagram
ADP
AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Reverse Blocking
BAT
ISET
STAT
Constant
Current
Over-
Temperature
Protection
Charge
Control
UVLO
VREF
FB
EN_BUCK
-
+
VREF
Input
GND
DH
Logic
DL
EN_BAT
VIN
LX
Functional Description
The AAT2556 is a high performance power system
comprised of a 500mA lithium-ion/polymer battery
charger and a 250mA step-down converter.
The battery charger is designed for single-cell
lithium-ion/polymer batteries using a constant cur-
rent and constant voltage algorithm. The battery
charger operates from the adapter/USB input volt-
age range from 4V to 6.5V. The adapter/USB
charging current level can be programmed up to
500mA for rapid charging applications. A status
monitor output pin is provided to indicate the bat-
tery charge state by directly driving one external
LED. Internal device temperature and charging
state are fully monitored for fault conditions. In the
event of an over-voltage or over-temperature fail-
ure, the device will automatically shut down, pro-
tecting the charging device, control system, and
the battery under charge. Other features include
an integrated reverse blocking diode and sense
resistor.
The step-down converter operates with an input volt-
age of 2.7V to 5.5V. The switching frequency is
1.5MHz, minimizing the size of the inductor. Under
light load conditions, the device enters power-saving
mode; the switching frequency is reduced, and the
converter consumes 30µA of current, making it ideal
for battery-operated applications. The output volt-
age is programmable from VIN to as low as 0.6V.
12 2556.2006.05.1.0
12 Page | ||
Seiten | Gesamt 29 Seiten | |
PDF Download | [ AAT2556 Schematic.PDF ] |
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