Analogic AAT3783 1-a linear li-ion/polymer battery charger with 28v over-voltage protection Datasheet

PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
General Description
Features
The AAT3783 BatteryManager™ is a single-cell LithiumIon (Li-Ion)/Li-Polymer battery charger IC, designed to
operate from USB ports, AC adapter inputs, or from a
charger adapter up to an input voltage of 6.5V. For
increased safety, the AAT3783 also includes over-voltage
input protection (OVP) up to 28V.
• USB or AC Adapter System Power Charger
• Programmable from 100mA to 1A Max
• 4.0V ~ 7.5V Input Voltage Range
▪ Over-Voltage Input Protection up to 28V
• High Level of Integration with Internal:
▪ Charging Device
▪ Reverse Blocking Diode
▪ Current Sensing
• Digital Thermal Regulation
• Charge Current Programming (ISET)
• Charge Termination Current Programming (TERM)
• Charge Timer (CT)
• Battery Temperature Sensing (TS)
• TS Pin Open Detection
• Automatic Recharge Sequencing
• No Trickle Charge Option Available
• Full Battery Charge Auto Turn Off / Sleep State /
Charge Termination
• Automatic Trickle Charge for Battery Pre-conditioning
• Battery Over-Voltage and Over-Current Protection
• Emergency Thermal Protection
• Power On Reset
• 16-pin 3x4mm TDFN Package
The AAT3783 precisely regulates battery charge voltage
and current for 4.2V Li-Ion/Polymer battery cells through
an extremely low RDS(ON) switch. When charged from an
adapter or a USB port, the battery charging current can
be set by an external resistor up to 1A. In the case of an
over-voltage condition in excess of 6.5V, a series switch
opens preventing damage to the battery and charging
circuitry. With the addition of an external resistor the
OVP trip point can be programmed to a level other than
the factory set value of 6.5V. In the case of an OVP condition a fault flag is activated.
Battery charge state is continuously monitored for fault
conditions. In the event of an over-current, battery overvoltage, short-circuit or over-temperature failure, the
device will automatically shut down, thus protecting the
charging device, control system and the battery under
charge. A status monitor output pin is provided to indicate the battery charge status by directly driving an
external LED. An open-drain power-source detection
output (ADPP) is provided to report the power supply
status.
Applications
•
•
•
•
•
•
The AAT3783 comes in a thermally enhanced, spacesaving, Pb-free 16-pin 3x4 mm TDFN package and is
specified for operation over the -40°C to +85°C temperature range.
Bluetooth™ Headsets, Headphones, Accessories
Digital Still Cameras
Mobile Phones
MP3 Players
Personal Data Assistants (PDAs)
Other Li-Ion/Polymer Battery Powered Devices
Typical Application
VIN
IN
BATS
IN
BAT
FLT
BATT+
10μF
AAT3783
BATT-
OVP
INCHR
TEMP
TS
2.2μF
CT
Battery
Pack
STAT
TERM
ADPP
3783.2008.08.1.2
Enable Charging
ENCHR
Enable OVP
ENOVP
ISET
RSET
RTERM
CT
GND
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PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Pin Descriptions
Pin Number
Name
Type
1
INCHR
I/O
2
BATS
I
3
4
5
BAT
TS
ENOVP
O
I/O
I
6
OVP
I
7
8
9
10
11
FLT
STAT
ADPP
CT
ENCHR
O
O
O
I
I
12
TERM
I
13
14
15, 16
GND
ISET
IN
I/O
I
I
Function
Internal connection between the output of the OVP stage and the input of the battery
charger. Decouple with 2.2μF capacitor.
Battery sense pin. Connect directly to the battery's + terminal. If not used, BATS
must be connected to BAT.
Connect to Lithium-Ion battery.
Battery temperature sense pin.
Active low enable for OVP stage.
Over-voltage protection threshold pin. Leave open for the default 6.5V setting; connect to a resistor to adjust the OVP setting (see Application Information).
Over-voltage fault flag, open drain.
Charge status pin, open drain.
Input power-good (USB port/adapter present indicator) pin, open-drain.
Charge timer programming input pin (no timer if grounded).
Active high enable pin (with internal pull-down) for charging circuitry.
Charge termination current programming input pin (internal default 10% termination current if TERM is open).
Connect to power ground.
Charge current programming input pin.
Input from USB port/ adapter connector.
Pin Configuration
TDFN34-16
(Top View)
INCHR
BATS
BAT
TS
ENOVP
OVP
FLT
STAT
2
16
1
EP1
2
15
3
14
4
5
13
EP2
12
6
11
7
10
8
9
IN
IN
ISET
GND
TERM
ENCHR
CT
ADPP
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Absolute Maximum Ratings1
Symbol
VIN
VINCHR
VFLT
VN
TJ
TLEAD
Description
IN continuous
Charger IN continuous
Fault flag continuous
BAT, STAT, ADPP, EN, ISET, TS, ENOVP, OVP
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads)
Value
Units
30
-0.3 to 7.5
-0.3 to +30
-0.3 to VINCHR + 0.3
-40 to 150
300
V
V
V
V
°C
°C
Value
Units
50
2
°C/W
W
Thermal Information2
Symbol
θJA
PD
Description
Maximum Thermal Resistance (TDFN 3x4)
Maximum Power Dissipation
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on a FR4 board.
3783.2008.08.1.2
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PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Electrical Characteristics1
VIN = 5V, TA = -40°C to +85°C; unless otherwise noted, typical values are at TA = 25°C.
Symbol
Description
Conditions
Operation
VIN_MAX
Input Over-Voltage Protection Range
VIN
Normal Operating Input Voltage Range
Over-Voltage Protection
Under-Voltage Lockout Threshold
VUVLO
UVLO Hysteresis
IQ
ISD(OFF)
Rising Edge
Shutdown Supply Current
Rising Edge
Charge Termination Threshold Current
Battery Charging Device
RDS(ON)
Total ON Resistance (IN to BAT)
V
V
V
mV
30
50
μA
4
8
μA
V
3
VIN > VUVLO
Charge Current = 100mA,
ENOVP = 0V, ENCHG = VIN
VBAT = 4.25V, ENOVP = ENCHG = 0V2
VBAT = 4V, ENOVP = VIN
4.158
(Option available for no trickle charge)
4
V
mV
60
150
mV
0.5
1
mA
0.4
0.4
1
2
μA
μA
4.20
0.5
2.6
4.242
V
%
V
2.5
2.7
VBAT_EOC 0.1
Current Regulation
ICC_RANGE
Charge Current Programmable Range
ICH_CC
Constant-Current Mode Charge Current
VISET
ISET Pin Voltage
KISET
Charge Current Set Factor: ICH_CC/IISET
VTERM
TERM Pin Voltage
ICH_TERM
28
7.5
6.5
Battery Recharge Voltage Threshold
Trickle Charge Current
Units
150
Operating Current
ICH_TRK
Max
3
60
VIN = 5V, ENOVP = 0V, IOUT = 0,
ENCHG = 0V
ENOVP = VIN = 5.5V, VOUT = 0V,
ENCHG = 0V
Rising Edge, OVP = Not Connected
Operating Quiescent Current
ISHUTDOWN
Shutdown Mode Current
IBAT
Leakage Current from BAT Pin
Voltage Regulation
VBAT_EOC
Output Charge Voltage Regulation
ΔVCH/VCH
Output Charge Voltage Tolerance
VMIN
Preconditioning Voltage Threshold
VRCH
Typ
4.0
VOVPT
Over-Voltage Protection Trip Voltage
Battery Charger
Under-Voltage Lockout Threshold
VUVLO
UVLO Hysteresis
Adapter Present Indicator Threshold
VADPP_TH
Voltage, VIN - VBAT
IOP
Min
VBAT = 3.6V
100
-10
V
1000
10
2
800
0.2
Constant Current Mode, VBAT = 3.6V
RTERM = 13.3kΩ
5
10
15
TERM Pin Open
5
10
15
RTERM = 13.3 kΩ, ICH_CC ≥ 800mA
8
10
12
VIN = 5V, IOUT = 1A
550
mA
%
V
V
%
ICH_CC
%
ICH_CC
%
mΩ
1. The AAT3783 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.
2. Current into charge.
4
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Electrical Characteristics1
VIN = 5V, TA = -40°C to +85°C; unless otherwise noted, typical values are at TA = 25°C.
Symbol
Description
Conditions
Logic Control
Input High Threshold
VEN(H)
VEN(L)
Input Low Threshold
VSTAT
Output Low Voltage
ISTAT
STAT Pin Current Sink Capability
VADDP
Output Low Voltage
ADPP Pin Current Sink Capability
IADPP
VFLT
Output Low Voltage
IFLT
FLT Pin Current Sink Capability
TBLK_FLT
FLT Blanking Time
TD_FLT
FLT Assertion Delay Time from Over-Voltage
TRESP_OV
Over-Voltage Response Time
TOVPON
OVP Turn-On Delay Time
TOVPR
OVP Turn-On Rise Time
TOVPOFF
OVP Turn-Off Delay Time
Min
Typ
Max
1.6
STAT Pin Sinks 4mA
ADPP Pin Sinks 4mA
FLT Pin Sinks 1mA
From De-assertion of OV
From Assertion of OV
VIN Rise to 7V from 5V in 1ns
Charging current = 500mA,
CINCHR = 1μF
Charging current = 500mA,
CINCHR = 1μF
Charging current = 500mA,
CINCHR = 1μF
5
10
1
1
0.4
0.4
8
0.4
8
0.4
5
15
Units
V
V
V
mA
V
mA
V
mA
ms
μs
μs
10
ms
1
ms
6
μs
4.4
V
105
3
25
3
75
331
25
2.39
25
115
85
100
140
15
% ICH_CC
Hour
Minute
Hour
μA
Battery Protection
VBOVP
Battery Over-Voltage Protection Threshold
IBOCP
TC
TK
TV
ITS
Battery Over-Current Protection Threshold
Trickle Plus Constant Current Mode Timeout
Trickle Timeout
Constant Voltage Mode Time Out
Current Source from TS Pin
TS1
TS Hot Temperature Fault
TS2
TS Cold Temperature Fault
TLOOP_IN
TLOOP_OUT
TREG
TSHDN
CCT = 100nF, VIN = 5V
CCT = 100nF, VIN = 5V
CCT = 100nF, VIN = 5V
Threshold
Hysteresis
Threshold
Hysteresis
Thermal Loop Entering Threshold
Thermal Loop Exiting Threshold
Thermal Loop Regulation
Chip Thermal Shutdown Temperature
Threshold
Hysteresis
69
316
2.30
81
346
2.48
mV
V
mV
ºC
ºC
ºC
ºC
1. The AAT3783 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.
3783.2008.08.1.2
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PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Constant Charging Current
vs. Set Resistor Values
Battery Charging Current
vs. Battery Voltage
1200
10000
Charging Current (mA)
Constant Charging Current (mA)
Typical Characteristics
1000
100
10
10
100
RSET = 2kΩ
800
600
RSET = 3.24kΩ
400
RSET = 8.06kΩ
200
0
2.5
1
1
RSET = 1.62kΩ
1000
1000
2.7
2.9
3.1
RSET (mA)
3.3
3.5
3.7
3.9
4.1
4.3
4.5
Battery Voltage (V)
End of Charge Regulation Tolerance vs. Input Voltage
End of Charge Voltage vs. Temperature
0.15
4.23
0.1
4.22
0.05
4.21
VEOC (%)
ΔVBAT_EOC/VBAT_EOC (%)
(VBAT_EOC = 4.2V)
0
-0.05
-0.1
4.20
4.19
4.18
-0.15
4.5
4.17
5
5.5
6
6.5
7
-40
7.5
-15
10
Input Voltage (V)
85
Preconditioning Charge Current
vs. Input Voltage
4.16
140
4.14
120
ICH_TRK (mA)
Recharge Voltage (%)
60
Temperature (°C)
Battery Recharge Voltage Threshold
vs. Temperature
4.12
4.1
4.08
4.06
100
RSET = 1.62kΩ
80
60
40
RSET = 2kΩ
RSET = 3.24kΩ
20
RSET = 8.06kΩ
4.04
-40
0
-15
10
35
60
85
Temperature (°C)
6
35
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
Input Voltage (V)
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Typical Characteristics
Preconditioning Charge Current vs. Temperature
Preconditioning Voltage Threshold
vs. Temperature
23
2.66
22
2.64
21
2.62
VMIN (V)
Preconditioning Charge Current (mA)
(RSET = 8.06kΩ; ICH_CC = 200mA)
20
19
2.60
2.58
2.56
18
2.54
17
-40
-15
10
35
60
-40
85
-15
10
Temperature (°C)
85
Total Resistance vs. Input Voltage
(RSET = 1.62kΩ
Ω)
(IN to BAT)
1200
800
VBAT = 3.3V
750
1100
VBAT = 3.6V
700
RDS(ON) (mΩ
Ω)
Constant Charging Current (mA)
60
Temperature (°C)
Constant Charging Current vs. Input Voltage
1000
900
VBAT = 3.9V
85°C
650
600
25°C
550
500
800
-40°C
VBAT = 4.1V
450
700
4
4.5
5
5.5
6
6.5
7
7.5
400
3.6
3.8
4
Input Voltage (V)
335
333
331
329
327
10
35
60
85
Temperature Sense Threshold
Voltage (TS2) (mV)
337
-15
Temperature (°C)
3783.2008.08.1.2
4.4
4.6
4.8
5
Temperature Sense Too Cold Threshold
vs. Temperature
339
325
-40
4.2
Input Voltage (V)
Temperature Sense Too Hot Threshold
vs. Temperature
Temperature Sense Threshold
Voltage (TS1) (mV)
35
2.400
2.395
2.390
2.385
2.380
2.375
-40
-15
10
35
60
85
Temperature (°C)
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PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Typical Characteristics
Temperature Sense Output Current
vs. Temperature
CT Pin Capacitance vs. Counter Timeout
78
1.0
0.9
Capacitance (µF)
ITS (mV)
76
74
72
70
0.8
0.7
Preconditioning Timeout
0.6
0.5
0.4
0.3
Preconditioning + Constant Current
Timeout or Constant Voltage Timeout
0.2
0.1
68
0.0
-40
-15
10
35
60
0
85
0.5
1
1.5
2
Temperature (°C)
2.5
3
3.5
4
4.5
5
Time (h)
Operating Current vs. ISET Resistor
Termination Current to Constant Current Ratio
vs. Termination Resistance
1.6
50
1.4
ICH_TERM/ICH_CC (%)
Constant current mode
IOP (mA)
1.2
1.0
0.8
0.6
0.4
0.2
40
30
20
10
Preconditioning mode
0.0
0
1
10
100
0
1000
10
20
RSET (kΩ)
1.4
1.4
1.2
1.2
VEN(H) (V)
VEN(L) (V)
1.6
25°C
0.8
85°C
0.6
60
-40°C
1.0
0.8
25°C
85°C
0.6
0.4
0.4
4
4.5
5
5.5
6
6.5
7
7.5
Input Voltage (V)
8
50
Input High Threshold vs. Input Voltage
1.6
-40°C
40
ITERM Resistance (kΩ)
Input Low Threshold vs. Input Voltage
1.0
30
4
4.5
5
5.5
6
6.5
7
7.5
Input Voltage (V)
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Typical Characteristics
OVP Trip Point vs. Temperature
FLT Blanking Time
12
0.05
6
4
6
2
4
0
2
-2
0
-4
VOVPTRIP Error (%)
8
FLT Voltage (V)
Input Voltage (V)
10
0.00
-0.05
-0.10
-0.15
-0.20
-40
10
35
60
85
Temperature (°C)
Time (2ms/div)
3783.2008.08.1.2
-15
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PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Functional Block Diagram
INCHR
IN
Reverse Blocking
Over-Current
Protection
IN
BAT
OVP
BAT S
CV/ PreCharge
Current
Compare
ENOVP
OVP
Sense
and
Control
Constant
Current
FLT
ADPP
Charge
Control
UVLO
Over
Temp.
Protect
Power
Detection
Thermal
Loop
Charge
Status
ISET
STAT
TERM
CT
ENCHR
TS
GND
Functional Description
Battery Preconditioning
The AAT3783 is a high performance battery charger
designed to charge single cell Lithium-Ion or Polymer
batteries with up to 1000mA of current from an external
power source. It is a stand-alone charging solution, with
just one external component required (two more for
options) for complete functionality. Also included is input
voltage protection (OVP) to up to +28V. OVP consists of
a low resistance P-channel MOSFET in series with the
charge control MOSFET, and also consists of under-voltage lockout protection, over-voltage monitor, and fast
shut-down circuitry with a fault output flag.
Battery charging commences only after the AAT3783
checks several conditions in order to maintain a safe
charging environment. The input supply must be above
the minimum operating voltage (VUVLO) and the enable
pin must be high. When the battery is connected to the
BAT pin, the AAT3783 checks the condition of the battery
and determines which charging mode to apply. If the
battery voltage is below the preconditioning voltage
threshold, VMIN, then the AAT3783 begins preconditioning the battery cell (trickle charging) by charging at 10%
of the programmed constant current. For example, if the
programmed current is 500mA, then the preconditioning
mode (trickle charge) current is 50mA. Battery cell preconditioning (trickle charging) is a safety precaution for
deeply discharged cells and will also reduce the power
dissipation in the internal series pass MOSFET when the
input-output voltage differential is at the greatest potential.
Battery Charging Operation
Figure 1 illustrates the entire battery charging profile or
operation, which consists of three phases:
1. Preconditioning (Trickle) Charge
2. Constant Current Charge
3. Constant Voltage Charge
10
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Preconditioning
Trickle Charge
Phase
Constant Current
Charge Phase
Constant Voltage
Charge Phase
Charge Complete Voltage
I = Max CC
Regulated Current
Constant Current Mode
Voltage Threshold
Trickle Charge and
Termination Threshold
I = CC / 10
Figure 1: Current vs. Voltage Profile during Charging Phases.
Constant Current Charging
Thermal Considerations
Battery cell preconditioning continues until the battery
voltage reaches the preconditioning voltage threshold,
VMIN. At this point, the AAT3783 begins constant current
charging. The current level for this mode is programmed
using a single resistor from the ISET pin to ground. The
programmed current can be set at a minimum 100mA
up to a maximum of 1A.
The actual maximum charging current is a function of
the charge adapter input voltage, the battery charge
state at the moment of charge, the ambient temperature, and the thermal impedance of the package. The
maximum programmable current may not be achievable
under all operating parameters.
Over-Voltage Protection
Constant Voltage Charging
Constant current charging will continue until such time
that the battery voltage reaches the voltage regulation
point, VBAT_EOC. When the battery voltage reaches VBAT_EOC,
the AAT3783 will transition to constant voltage mode.
The regulation voltage is factory programmed to a nominal 4.2V and will continue charging until the charge
termination current is reached.
Charge Status Output
The AAT3783 provides battery charge status via a status
pin. This pin is internally connected to an N-channel
open-drain MOSFET, which can be used drive an external
LED. The status pin can indicate the following conditions:
Event Description
STATUS
No battery charging activity
Battery charging via adapter or USB port
Charging completed
Table 1: LED Status Indicator.
3783.2008.08.1.2
OFF
ON
OFF
In normal operation, a P-channel MOSFET acts as a
slew-rate controlled load switch, connecting and disconnecting the power supply from IN to INCHR. A low resistance MOSFET is used to minimize the voltage drop
between the voltage source and the charger and to
reduce the power dissipation. When the voltage on the
input exceeds the over-voltage trip point (internally set
by the factory or externally programmed by a resistor
connected to the OVP pin), the device immediately turns
off the internal P-channel FET which disconnects the
charger from the abnormal input voltage, therefore preventing any damage to the charger. Simultaneously, the
fault flag is raise, alerting the system.
If an over-voltage condition is applied at the time of the
device enable, then the switch will remain OFF.
OVP Under-Voltage Lockout (UVLO)
The AAT3783 OVP circuitry has a fixed 3V under-voltage
lockout level (UVLO). When the input voltage is less than
the UVLO level, the MOSFET is turned off. 100mV of
hysteresis is included to ensure circuit stability.
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PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Over-Current Protection
Enable / Disable
The AAT3783 over-current protection provides faultcondition protection that limits the charge current to
approximately 1.6A under all conditions, even if the ISET
pin gets shorted to ground.
The AAT3783 provides an enable function to control the
OVP stage and charger on and off independently.
FLT Blanking Time
The FLT output is an active-low open-drain fault (OV)
reporting output. A pull-up resistor should be connected
from FLT to the logic I/O voltage of the host system. FLT
will be asserted immediately an over-voltage fault occurs
(only about a 1μs inherited internal circuit delay). A
10ms blanking is applied to the FLT signal prior to deassertion.
12
ENOVP is an active-low enable input. ENOVP is driven
low, connected to ground, or left floating for normal
device operation. Taking ENOVP high turns off the
MOSFET of the OVP stage. In the case of an over-voltage
or UVLO condition, toggling ENOVP will not override the
fault condition and the switch will remain off.
OVP Turn-On Delay Time
On initial power-up, if VIN < UVLO or if VOVP > 6.5V the
PMOS is held off. If UVLO < VIN, VOVP < 6.5V, and ENOVP
is low, the device enters startup after a 10ms internal
delay.
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
System Operation Flow Chart
ADP
Voltage
Power
Input
S
Voltage
ADP > VADPP
VIN>VUVLO
Power
On
Sleep
Sleep
Reset
Mode
Mode
No
Yes
Enable
Power
Select
OVP?
No
ENOVP = Yes
OVP Condition
Monitoring
VIN > 6.5V?
No
Shut
Disconnect
Input
ShutDown
Down
fromMode
charger
Mode
ENCHR = Yes
Fault
Fault
Condition Monitoring
Power
Select
OV, OT,
VTS1<TS<VTS2
Yes
Shutdown
Shut
ShutDown
Down
Mode
Mode
Mode
Expire
No
Charger
Shut
Down
ShutTimer
Down
Control
Mode
Mode
Preconditioning
Test
V
BAT
VMIN>V
>V
MIN
Yes
Preconditioning
Shut
ShutDown
Down
Enable
(Trickle
Charge)
Mode
Mode
BAT
No
No
Recharge
Test
VV
RCH
BAT
RCH> V
BAT
Yes
Current Phase Test
VIN>VBAT_EOC
Yes
Constant
Shut
Down
ShutCurrent
Down
Charge
Mode
Mode
Mode
VCH >VBAT
No
Device
DeviceTemp.
Temp. No
Monitor
Monitor
>110 C
TJ >115
Yes
Thermal Loop
Shut
Down
Shut
Down
Current
Reduction
Mode
In C.C.
Mode
Mode
Voltage Phase Test
IBAT>ITERM
IBAT> MIN
I
Yes
Constant
Shut
Down
ShutVoltage
Down
Charge
Mode
Mode
Mode
No
Charge
Charge
Completed
Completed
3783.2008.08.1.2
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13
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Application Information
Programming the Over-Voltage
Protection Trip Point
The default over-voltage protection trip point of the
AAT3783 is set to 6.5V by the factory. However, the
over-voltage protection trip point can be programmed
from 3.8V to 7.5V by the user with one external resistor,
either R5 or R6. The placement of R5 is between IN and
OVP. The placement of R6 is between OVP and GND.
Table 2 summarizes resistor values for various overvoltage protection trip points. Use 1% tolerance metal
film resistors for programming the desired OVP trip
point.
R6 (KΩ)
R5 (KΩ)
VOVP_TRIP POINT (V)
short
0.499
1.3
3.01
open
open
open
open
open
open
open
open
open
open
4.99
2.49
1.0
short
7.5
7.25
7.0
6.75
6.5
5.5
5.0
4.5
3.87
BATS pin may be terminated to the BAT pin using a 10kΩ
resistor. Under normal operation, the connection to the
battery terminal will be close to 0Ω; if the BATS connection becomes an open circuit, the 10kΩ resistor will provide feedback to the BATS pin from the BAT connection
with a voltage sensing accuracy loss of 1mV or less.
Constant Charge Current
The constant current mode charge level is user programmed with a set resistor placed between the ISET pin
and ground. The accuracy of the constant charge current, as well as the preconditioning trickle charge current, is dominated by the tolerance of the set resistor
used. For this reason, a 1% tolerance metal film resistor
is recommended for the set resistor function. The constant charge current levels from 100mA to 1A may be set
by selecting the appropriate resistor value from Table 3.
Constant Charging
Current (mA)
Set Resistor Value (kΩ)
10
20
50
100
200
300
400
500
600
700
800
900
1000
162
80.6
32.4
16
8.06
5.36
4.02
3.24
2.67
2.26
2
1.78
1.62
Table 2: Programming OVP Trip Point for
AAT3783 with One Resistor.
Battery Connection
and Battery Voltage Sensing
Battery Connection (BAT)
Battery Voltage Sensing (BATS)
The BATS pin is provided to employ an accurate voltage
sensing capability to measure the positive terminal voltage at the battery cell being charged. This function
reduces measured battery cell voltage error between the
battery terminal and the charge control IC. The AAT3783
charge control circuit will base charging mode states
upon the voltage sensed at the BATS pin. The BATS pin
must be connected to the battery terminal for correct
operation. If the battery voltage sense function is not
needed, the BATS pin should be terminated directly to
the BAT pin. If there is concern of the battery sense
function inadvertently becoming an open circuit, the
14
Table 3: RSET Values.
Constant Charging Current (mA)
A single cell Li-Ion/Polymer battery should be connected
between the BAT pin and ground.
10000
1000
100
10
1
1
10
100
1000
RSET (kΩ
Ω)
Figure 2: Constant Charging Current
vs. Set Resistor Values.
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Charge Termination Current
The charge termination current ICH_TERM can be programmed by connecting a resistor from TERM to GND:
ICH_TERM =
15µA · RTERM
· ICH_CC
2V
Time
25 minutes
3 hours
3 hours
Table 4: Summary for a 0.1μF Ceramic Capacitor
Used for the Timing Capacitor.
Where:
ICH_TERM = Charge termination current level
ICH_CC = Programmed fast charge constant current level
RTERM = TERM resistor value
If the TERM pin is left open, the termination current will
set to 10% of the constant charging current as the
default value.
When the charge current drops to the defaulted 10% of
the programmed charge current level or programmed
terminated current in the constant voltage mode, the
device terminates charging and goes into a sleep state.
The charger will remain in this sleep state until the battery voltage decreases to a level below the battery
recharge voltage threshold (VRCH).
Consuming very low current in sleep state, the AAT3783
minimizes battery drain when it is not charging. This
feature is particularly useful in applications where the
input supply level may fall below the battery charge or
under-voltage lockout level. In such cases where the
AAT3783 input voltage drops, the device will enter sleep
state and automatically resume charging once the input
supply has recovered from the fault condition.
Protection Circuitry
Programmable Watchdog Timer
The AAT3783 contains a watchdog timing circuit to shut
down charging functions in the event of a defective battery cell not accepting a charge over a preset period of
time. Typically, a 0.1μF ceramic capacitor is connected
between the CT pin and ground. When a 0.1μF ceramic
capacitor is used, the device will time out a shutdown
condition if the trickle charge mode exceeds 25 minutes
and a combined trickle charge plus constant current
mode of 3 hours. When the device transitions to the
constant voltage mode, the timing counter is reset and
will time out after an additional 3 hours if the charge
current does not drop to the charge termination level.
3783.2008.08.1.2
Mode
Trickle Charge (TC) Time Out
Trickle Charge (TC) + Constant Current (CC)
Mode Time Out
Constant Voltage (CV) Mode Time Out
The CT pin is driven by a constant current source and will
provide a linear response to increase in the timing
capacitor value. Thus, if the timing capacitor were to be
doubled from the nominal 0.1μF value, the time-out
periods would be doubled. If the programmable watchdog timer function is not needed, it can be disabled by
terminating the CT pin to ground. The CT pin should not
be left floating or un-terminated, as this will cause errors
in the internal timing control circuit.
The constant current provided to charge the timing
capacitor is very small, and this pin is susceptible to
noise and changes in capacitance value. Therefore, the
timing capacitor should be physically located on the
printed circuit board layout as close as possible to the CT
pin. Since the accuracy of the internal timer is dominated by the capacitance value, a 10% tolerance or better ceramic capacitor is recommended. Ceramic capacitor materials, such as X7R and X5R types, are a good
choice for this application.
Battery Over-Voltage Protection
An over-voltage event is defined as a condition where
the voltage on the BAT pin exceeds the maximum battery charge voltage and is set by the over-voltage protection threshold (VBOVP). If an over-voltage condition
occurs, the AAT3783 charge control will shut down the
device until the voltage on the BAT pin drops below VOVP.
The AAT3783 will resume normal charging operation
after the over-voltage condition is removed.
Battery Temperature Monitoring
In the event of a battery over-temperature condition, the
charge control will turn off the internal pass device. After
the system recovers from a temperature fault, the device
will resume charging operation. The AAT3783 checks
battery temperature before starting the charge cycle, as
well as during all stages of charging. This is accomplished
by monitoring the voltage at the TS pin. This system is
intended for use with negative temperature coefficient
thermistors (NTC) which are typically integrated into the
battery package. Most of the commonly used NTC therm-
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15
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Over-Temperature Shutdown
The AAT3783 has a thermal protection control circuit
which will shut down charging functions should the internal die temperature exceed the preset thermal limit
threshold. Once the internal die temperature falls below
the thermal limit, normal operation will resume the previous charging state.
Digital Thermal Loop Control
Due to the integrated nature of the linear charging control pass device for the adapter mode, a special thermal
loop control system has been employed to maximize
charging current under all operation conditions. The
thermal management system measures the internal circuit die temperature and reduces the fast charge current
when the device exceeds a preset internal temperature
control threshold. Once the thermal loop control becomes
active, the fast charge current is initially reduced by a
factor of 0.44.
The initial thermal loop current can be estimated by the
following equation:
The AAT3783 is designed to deliver a continuous charging current. The limiting characteristic for maximum safe
operating charging current is its package power dissipation. Many considerations should be taken into account
when designing the printed circuit board layout, as well
as the placement of the IC package in proximity to other
heat generating devices in a given application design.
The ambient temperature around the IC will also have
an effect on the thermal limits of a battery charging
application.
The maximum limits that can be expected for a given
ambient condition can be estimated by the following
discussion. First, the maximum power dissipation for a
given situation should be calculated:
PD(MAX) =
(TJ(MAX) - TA)
θJA
Where:
PD(MAX) =
θJA
=
TJ
=
TA
=
Maximum Power Dissipation (W)
Package Thermal Resistance (°C/W)
Thermal Loop Entering Threshold (°C) [115ºC]
Ambient Temperature (°C)
Figure 3 shows the relationship of maximum power dissipation and ambient temperature of AAT3783.
2.5
2
1.5
1
0.5
0
ITLOOP = ICH_CC · 0.44
0
The thermal loop control re-evaluates the circuit die temperature every three seconds and adjusts the fast charge
current back up in small steps to the full fast charge current level or until an equilibrium current is discovered
and maximized for the given ambient temperature condition. The thermal loop controls the system charge level;
therefore, the AAT3783 will always provide the highest
level of constant current in the fast charge mode possible
for any given ambient temperature condition.
16
Thermal Considerations
and High Output Current Applications
PD(MAX) (W)
istors in battery packs are approximately 10kΩ at room
temperature (25°C). The TS pin has been specifically
designed to source 75μA of current to the thermistor.
The voltage on the TS pin resulting from the resistive
load should stay within a window of 331mV to 2.39V. If
the battery becomes too hot during charging due to an
internal fault or excessive constant charge current, the
thermistor will heat up and reduce in value, pulling the
TS pin voltage lower than the TS1 threshold, and the
AAT3783 will stop charging until the condition is removed,
when charging will be resumed. If the use of the TS pin
function is not required by the system, it should be terminated to ground using a 10kΩ resistor. Alternatively,
on the AAT3783, the TS pin may be left open.
25
50
75
100
TA (°C)
Figure 3: Maximum Power Dissipation Before
Entering Digital Thermal Loop.
Next, the power dissipation can be calculated by the following equation:
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PD = [(VIN - VBAT) · ICH + (VIN · IOP)]
3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Where:
PD
VIN
VBAT
ICH
IOP
=
=
=
=
Total Power Dissipation by the Device
Input Voltage
Battery Voltage as Seen at the BAT Pin
Constant Charge Current Programmed for the
Application
= Quiescent Current Consumed by the Charger IC
for Normal Operation [0.4mA]
By substitution, we can derive the maximum charge current before reaching the thermal limit condition (thermal
loop). The maximum charge current is the key factor
when designing battery charger applications.
no specific capacitor equivalent series resistance (ESR)
requirement for CIN. However, for higher current operation, ceramic capacitors are recommended for CIN due to
their inherent capability over tantalum capacitors to
withstand input current surges from low impedance
sources such as batteries in portable devices.
Typically, 50V rated capacitors are required for most of
the application to prevent any surge voltage. Ceramic
capacitors selected as small as 1210 are available which
can meet these requirements. Other voltage rating
capacitor can also be used for the known input voltage
application.
Charger Input Capacitor
(PD(MAX) - VIN · IOP)
ICH(MAX) =
VIN - VBAT
A 2.2μF decoupling capacitor is recommended to be
placed between INCHR and GND.
(TJ(MAX) - TA) - V · I
IN
OP
θJA
ICH(MAX) =
VIN - VBAT
Charger Output Capacitor
In general, the worst condition is the greatest voltage
drop across the charger IC, when battery voltage is
charged up to the preconditioning voltage threshold and
before entering thermal loop regulation. Figure 4 shows
the maximum charge current in different ambient temperatures.
The AAT3783 only requires a 1μF ceramic capacitor on
the BAT pin to maintain circuit stability. This value should
be increased to 10μF or more if the battery connection is
made any distance from the charger output. If the
AAT3783 is used in applications where the battery can be
removed from the charger, such as with desktop charging cradles, an output capacitor greater than 10μF may
be required to prevent the device from cycling on and off
when no battery is present.
1000
TA = 45°C
ICC_MAX (mA)
Printed Circuit Board
Layout Recommendations
TA = 25°C
800
600
400
200
TA = 85°C
TA = 60°C
0
4
4.5
5
5.5
6
6.5
7
7.5
VIN (V)
Figure 4: Maximum Charging Current Before the
Digital Thermal Loop Becomes Active.
Input Capacitor
A 1μF or larger capacitor is typically recommended for
CIN. CIN should be located as close to the device VIN pin
as practically possible. Ceramic, tantalum, or aluminum
electrolytic capacitors may be selected for CIN. There is
3783.2008.08.1.2
For proper thermal management and to take advantage
of the low RDS(ON) of the AAT3783, a few circuit board
layout rules should be followed: VIN and VOUT should be
routed using wider than normal traces, and GND should
be connected to a ground plane. To maximize package
thermal dissipation and power handling capacity of the
AAT3783 DFN34 package, solder the exposed paddle of
the IC onto the thermal landing of the PCB, where the
thermal landing is connected to the ground plane. This
AAT3783 has two exposed paddles (EP1 and EP2). EP1 is
connected to INCHR (pin 1) and EP2 is connected to GND
(pin 13). DO NOT make one whole thermal landing! If
heat is still an issue, multi-layer boards with dedicated
ground planes are recommended. Also, adding more
thermal vias on the thermal landing would help the heat
being transferred to the PCB effectively.
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17
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
JP3
INCHR
INCHR
+5V
Red LED
D1
JP1
Enable
R3
(open)
U1
R7 6k
4V - 7.5V
VIN
GND
2
1
R5
(open)
C1
1μF
INCHR
R6
(open)
C2
2.2μF
R8 1.5k
7
5
15
16
6
FLT
ENOVP
IN
IN
OVP
ADPP
STAT
BATS
BAT
TS
9
8
2
3
4
11
ENCHR
TERM
12
1
INCHR
ISET
14
CT
10
INCHR
13
JP2
GND
AAT3783
Red LED Green LED
D2
D3
R9 1.5k
1
2
3
C4
0.1μF
GND
BAT
TS
C3
10μF
R1
1.62k
R2
13.3k
R4
10k
EN_CHR
C1 1206 X7R 1μF 50V GRM31MR71H105KA88
(C1 1206 X7R 2.2μF 50V GRM31CR71H225KA88L)
(C1 1210 X7R 4.7μF 50V GRM32ER71H475KA88L)
C2 0805 X5R 2.2μF 10V GRM188R61A225KE34
C3 0805 X7R 10μF 10V GRM21BR71A106KE51L
Figure 5: AAT3783 Evaluation Board Schematic.
Component
Part#
Description
U1
AAT3783IRN
R1
R2
R4
R7
R8, R9
C1
C2
C3
C4
JP1, JP2, JP3
D1, D2
D3
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM31MR71H105KA88
GRM188R61A225KE34
GRM21BR71A106KE51L
GRM188R71E104KA01
PRPN401PAEN
CMD15-21SRC/TR8
CMD15-21VGC/TR8
1A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage
Protection; TDFN Package
1.62KΩ, 1%, 1/4W; 0603
13.3KΩ, 1%, 1/4W; 0603
10KΩ, 5%, 1/4W; 0603
6KΩ, 5%, 1/4W; 0603
1.5KΩ, 5%, 1/4W; 0603
CER 1μF 50V 10% X7R 1206
CER 2.2μF 10V 10% X5R 0805
CER 10μF 10V 10% X7R 0805
CER 0.1μF 25V 10% X7R 0603
Conn. Header, 2mm zip
Red LED; 1206
Green LED; 1206
Manufacturer
AnalogicTech
Vishay
Vishay
Vishay
Vishay
Vishay
Murata
Murata
Murata
Murata
Sullins Electronics
Chicago Miniature Lamp
Chicago Miniature Lamp
Table 5: AAT3783 Evaluation Board Bill of Materials.
18
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3783.2008.08.1.2
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Figure 5: AAT3783 Evaluation Board
Top Layer.
Figure 6: AAT3783 Evaluation Board
Middle Layer.
Figure 7: AAT3783 Evaluation Board
Bottom Layer.
Figure 8: Magnified View of Exposed Paddles
on AAT3783 Evaluation Board Top Layer.
3783.2008.08.1.2
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19
PRODUCT DATASHEET
AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TDFN34-16
XQXYY
AAT3783IRN-4.2-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor
products that are in compliance with current RoHS standards, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. For more information, please visit our website at
http://www.analogictech.com/about/quality.aspx.
Package Information
TDFN34-16
1.600 ± 0.050
0.35 REF
R0.15 (REF)
Pin 1 ID
0.450 ± 0.050
0.230 ± 0.050
4.000 ± 0.050
Index Area
2.350 ± 0.050
0.700 ± 0.050
3.000 ± 0.050
0.25 REF
0.430 ± 0.050
1.600 ± 0.050
0.750 ± 0.050
Top View
0
+ 0.100
-0.000
Bottom View
0.230 ± 0.050
Side View
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Advanced Analogic Technologies, Inc.
3230 Scott Boulevard, Santa Clara, CA 95054
Phone (408) 737-4600
Fax (408) 737-4611
© Advanced Analogic Technologies, Inc.
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 without notice. Except as provided in AnalogicTech’s terms and
conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate
design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to
support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other
brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
20
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3783.2008.08.1.2