ACTIVE-SEMI ACT2803QJ-T0435 5v/2.4a dual cell battery power manager Datasheet

ACT2803
Rev 1, May-12-2016
5V/2.4A Dual Cell Battery Power Manager
 Battery Over-charge and Over-discharge
FEATURES
Protections
 Charge/Discharge Thermal Regulation
 TQFN5x5-40 Package
 Dedicated Single-chip Integrated Dual Cell

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
Battery Management
Dual Cell Battery Charger with Cell Balancing
Management
Auto Detection support USB BC1.2, Chinese
YD/T 1591-2009, Apple, and Samsung Devices
Meet EN55022 Class B Radiated EMI Standard
Pass MFi Test
4.5V-5.5V Input Voltage and 2.75A Input Current
Limit
2.4A Output Current with CC Regulation
5.07V+/-1% Output with Prioritized Power Path
from Input to Output
4.20V/4.35V +/- 0.5% Battery Charge Voltage
Accuracy of Each Cell
Output Plug-in Detection Wakeup and No Load
Detection Sleep Mode
Optimized Power Path and Battery Charge
Control
<10uA Low Battery Drainage Current
I2C Port for Optimal System Performance and
Status Reporting
Configurable Charge, Discharge and HZ modes
>92% Charge and Discharge Efficiency at 2.4A
Output for Full Battery Range
4 Modes of LED Operation
Capability to Charge Wearable Devices
Weak Input Sources Accommodation
Safety:
 Input Over-voltage Protection
 Nearly Zero Power Short Circuit Protection
 Output Over-voltage Protection
APPLICATIONS





Backup Battery Pack
Power Bank
Dual Cell Boost Battery Charger
Bluetooth Speaker
Standalone Battery Charger with USB Output
GENERAL DESCRIPTION
ACT2803 is a space-saving and dedicated singlechip solution for dual-cell battery charge and
discharge. It takes 5V USB input source to charge a
dual cell battery with boost configuration in three
phases: preconditioning, constant current, and
constant voltage. Charge is terminated when the
current reaches 10% of the fast charge rate. The
battery charger is thermally regulated at 110˚C with
charge current foldback.
If input 5V is not present, ACT2803 discharge a
dual cell battery with buck configuration to provide
5.07V+/-1% to output ports. There is a power path
from input to output. The cycle-by-cycle peak
current mode control, constant current regulation,
short circuit protection and over voltage protection
maximize safe operation.
ACT2803 provides 4 LED drive pins for battery
capacity level and charge status indication to
indicate 25%, 50%, 75%, and 75% above battery
level with battery impedance compensation. The
LED indication patterns are programmable .
ACT2803 is available in a thermally enhanced
5mmx5mm QFN55-40 package with exposed pad.
Buck Output CC/CV
Buck Output Voltage (V)
6.0
5.0
VBAT = 6.0V
4.0
3.0
VBAT = 8.2V
2.0
1.0
0
0
500
1000
1500
2000
2500
3000
Output Current (mA)
Innovative PowerTM
-1-
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
ORDERING INFORMATION
PART NUMBER
BATTERY CELL VOLTAGE
JUNCTION TEMPERATURE
PACKAGE
PINS
ACT2803QJ-T
4.20V
-40˚C to 150˚C
QFN55-40
40
ACT2803QJ-T0435
4.35V
-40˚C to 150˚C
QFN55-40
40
PIN CONFIGURATION
TOP VIEW
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-2-
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
PIN DESCRIPTIONS
PIN
NAME
1
CSN
Output current sense negative input.
2,3
CSP
Output current sense positive input.
4, 5
VOUT
6, 7
VIN
8
OVGATE
Output to drive optional external NMOS protect IC from over voltage.
9
OVSENS
USB or AC Adapter input sense.
10
SCL
I2C clock input.
11
SDA
I2C data input.
12
PGND
13
HSB
High side bias pin. Connect a 47nF ceramic capacitor from HSB to SW.
14,15
SW
Internal switch connected to a terminal of the output inductor.
16,17
BAT
BAT connection. Connect it to battery current sense positive terminal. Bypass to PGND with high
quality ceramic capacitors placed as close to the IC as possible.
18
BATS
Battery charge current sense input. Connect to charge sense resistor positive terminal with
Kevin sense.
19
BATP
Connect to charge sense resistor negative terminal and battery positive terminal.
20
BATC
Battery central point connection. Connect to dual battery cell common terminal.
21
CBD
Cell balancing discharge. Connect to a discharge resistor from this pin to battery common
terminal.
22
BATN
Battery negative terminal.
23
ICST
Fast charge current setting pin. Connect a resistor from this pin to AGND to set the charging
current. The current setting ranges from 0.5A-1.8A. The voltage at this pin reflects the charge
current and discharge current in charge mode and discharge mode, respectively.
24
TH
25
VREG
+5V Bias output. Connect a 1.0uF to this pin. This pin supplies up to 50mA output current. The
bias turns on in charge mode and discharge mode. Internal register bit can shut down the bias.
Bias turns off in HZ mode.
26
AGND
Logic ground output. Connect this pin to the exposed PGND pad on same layer with IC.
27
PB
28
LED1
Innovative PowerTM
DESCRIPTION
Power Output Pin.
USB or AC Adapter input.
Power ground. Directly connect this pin to IC thermal PAD and connect 22uF high quality
capacitors from BAT to PGND on the same layer with IC.
Temperature sensing input. Connect to a battery thermistor terminal.
Push button input. When this pin is pushed for more than 40ms, LED1-4 indicators are enabled
for 5 seconds.
Battery level indicator.
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
PIN DESCRIPTIONS
PIN
NAME
29
LED2
Battery level indicator.
30
LED3
Battery level indicator.
31
LED4
Battery level indicator.
32
LEDLS1
LED1 threshold level shift. Connect a resistor from the pin to AGND to shift LED1 threshold.
33
LEDLS2
LED2 threshold level shift. Connect a resistor from the pin to AGND to shift LED2 threshold.
34
LEDLS3
LED3 threshold level shift. Connect a resistor from the pin to AGND to shift LED3 threshold.
35
LEDLS4
LED4 threshold level shift. Connect a resistor from the pin to AGND to shift LED4 threshold.
36
PT
LED indication mode input. The 5 modes of LED indication patterns are set by a voltage at this
pin. Connect a resistor at the pin to set the voltage and an LED indication pattern .
37
RIMC
RIMC Battery impedance compensation input. Connect a resistor to this pin to offset the LED
thresholds in charge mode and discharge mode.
38
HYST
The hysteresis window setting input. Connect a resistor at the pin to set the hysteresis windows
for LED1, 2, 3, 4. In charge mode, LED thresholds moves up and in discharge mode, LED
thresholds moves down.
39
DM
Output port auto detection input. Connected to portable device D-.
40
DP
Output port auto detection input. Connected to portable device D+.
41
PGND
Innovative PowerTM
DESCRIPTION
Exposed pad. Must be soldered to ground plane layer(s) on the PCB for best electrical and
thermal conductivity.
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE
UNIT
LEDLS1, LEDLS2, LEDLS3, LEDLS4, RIMC, HYST and PT to GND
-0.3 to +6
V
LED1, LED2, LED3 and LED4 to GND
-0.3 to +6
V
PB, DM, DP, TH, SCL, SDA and ICST to GND
-0.3 to +6
V
OVSENS to GND
-0.3 to +16
V
OVGATE to GND
-0.3 to +12
V
VIN, VOUT and VREG to GND
-0.3 to +6
V
CSP to CSN, CSP to VOUT
-0.3 to +0.3
V
BAT to BATS, BATS to BATP
-0.3 to +0.3
V
BATC to BATN
-0.3 to +6
V
BAT to BATC
-0.3 to +6
V
BATN to GND
-0.3 to +0.3
V
CBD to BAT
-6 to +0.3
V
BATN to CBD
-6 to +0.3
V
SW to PGND
-0.3 to +12
V
HSB to SW
-0.3 to +6
V
40
℃/W
Operating Junction Temperature (TJ)
-40 to 150
℃
Operating Temperature Range (TA)
-40 to 85
℃
Store Temperature
-55 to 150
℃
300
℃
Junction to Ambient Thermal Resistance (θJA)
Lead Temperature (Soldering, 10 sec)
Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long
periods may affect device reliability.
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Input Current Limit, Over Voltage Protection, Output Under Voltage Protection
Input Voltage Range
4.5
6.0
V
VIN rising, VIN_OVP
Input Over Voltage Hysteresis
VIN falling, VIN_OVP_HYST
290
mV
Input Under Voltage Lock-Out
VIN rising, VIN_UVLO
4.2
V
Input Under Voltage Lock-Out Hysteresis
VIN falling, VIN_UVLO_HYST
200
mV
-10%
5.7
V
Input Over Voltage Protection
Input Current Limit Setting Range
5.5
5.5
2.75
+10%
A
Output Under Voltage Protection (UVP)
VOUT falling, VOUT_UVP
3.65
V
Output Under Voltage Protection Hysteresis
VOUT rising, VOUT_UVP_HYST
200
mV
3
s
Q1 Wait Time in Hiccup Mode
Boost Mode/Charge Mode
Switching Frequency
-15%
400
+15%
KHz
Precondition Voltage Threshold of Each Cell
VBAT1,2 rising
2.8
V
Preconditioning Current
Percentage of fast charge current
15
%
Boost Charger UVLO
VOUT rising, BST_UVLO
4.2
V
VBAT_EOC (ACT2803QJ-T)
-0.5%
4.2
+0.5%
V
VBAT_EOC (ACT2803QJ-T0435)
-0.5%
4.35
+0.5%
V
Fast Charge Current Setting
Ricst=8kΩ
-10%
1.0
+10%
A
End of Charge Detection Current
Percentage of fast charge current
10
%
Shielding cable Detection Threshold at PB
PB falling In charge mode
3.5
V
Start point
4.7
V
End point
4.6
V
Start point
4.92
V
End point
4.82
V
45
min
Battery End-Of-Charge Voltage
Charge Current Foldback Threshold with VIN,
Without Shielding Cable Connected
Charge Current Foldback Threshold with VIN,
With Shielding Cable Connected
Continuous Charging Time after EOC
TEOC
Charger Thermal Regulation Temperature
Innovative PowerTM
100
-6-
110
120
℃
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Buck mode/Discharge
Buck Under Voltage Lock-Out
VABT falling, VBAT1,2
2.9
V
REG3[1:0]=00,Default
5.07
V
REG3[1:0]=01
5.12
V
REG3[1:0]=10
5.17
V
REG3[1:0]=11
5.22
V
VOUT Output Regulation Voltage
VOUT Current Limit
RCS=25mΩ, ICC
2.45
Buck Converter Under Voltage Protection
Threshold
VOUT falling goes into hiccup
3.65
V
Buck Converter Over Voltage Protection
Threshold
VOUT rising, BCK_OVP
5.7
V
3.4
s
Buck Convert Hiccup Time
Buck Converter Light-Load Cut-off Current
5
Buck Converter Light-Load Cut-off Deglitch
Time
2.65
10
2.85
15
12.5
A
mA
s
High Side Switch Peak Current Limit
All condition
4.5
A
Over Temperature Protection
OTP
160
℃
Over Temperature Protection Hysteresis
OTP_HYST
20
℃
2.6
3
A
101.5
102.5
Battery Protection
Battery Over Charge Current
Battery Over Voltage
Percentage of EOC Voltage
Battery Under Voltage and Short Circuit
Protection
Preconditioning timer
103.5
%
1.6
V
1
hr
Charge mode
140
uA
Discharge mode
100
uA
Charge mode
2.5
V
Discharge mode
2.5
V
If timer expires, goes to latch-off
TH Pull-up Current
TH High Threshold
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
Charge mode
TYP
MAX UNIT
1
V
0.57
V
50
mA
TH Low Threshold
Discharge mode
System Management
VREG Output Current
PB Rising Threshold
PB Rising, discharge mode
0.95
V
PB Falling Threshold
PB Falling, discharge mode
0.75
V
PB internal pull up resistance
Pull up to internal supply
1.2
MΩ
Fault Condition Alarm Frequency
0.5s on and 0.5s off
1.0
Hz
10
s
Fault Condition Alarm Timer
LED Indication
LED1-4 Indication Level Setting
5.5
LED Sink Current
LED1-4 Scan Interval
Innovative PowerTM
For each LED pattern before lighting LEDs
-8-
8.8
V
3
mA
0.5
s
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0.4
V
SCL, SDA Input Low
VCC= 5V
SCL, SDA Input High
VCC= 5V
SDA Leakage Current
SDA=5V
1
µA
SDA Output Low
IOL = 5mA
0.35
V
1000
kHz
1.25
0
SCL Clock Frequency, fSCL
V
SCL Low Period, tLOW
0.5
µs
SCL High Period, tHIGH
0.26
µs
50
ns
0
ns
SDA Data Setup Time, tSU
SDA Data Hold Time, tHD
See Note: 1
Start Setup Time, tST
For Start Condition
260
ns
Stop Setup Time, tSP
For Stop Condition
260
ns
Capacitance on SCL or SDA Pin
10
pF
SDA Fall Time SDA, Tof
Device requirement
120
ns
Rise Time of both SDA and SCL, tr
See Note: 3
120
ns
Fall Time of both SDA and SCL, tf
See Note: 3
120
ns
50
ns
Pulse Width of spikes must be suppressed on SCL and SDA
Notes:
1.
2.
3.
4.
0
Comply to I2C timings for 1MHIZ operation - “Fast Mode Plus”
No internal timeout for I2C operations
This is a I2C system specification only. Rise and Fall time of SCL & SDA not controlled by the device.
Device Address is 7’h5A - Read Address is 8’hB4 and write is 8’hB5
tSCL
SCL
tST
tHD
tSU
tSP
SDA
Start
condition
Innovative PowerTM
Stop
condition
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
I2C DESCRIPTION
PROGRAMMABLE PARAMETER LIST
ITEMS
STEP/STATUS
DEFAULT
COMMENT
0.6A,1.25A, 2.75A, 3.4A
2.75A
+/-10%
4.2V, 4.5V
4.2V
+/-3.0%
2.7V, 2.8V, 2.9V, 3.0V
2.9V
+/-2%
1.25A/2.65A
2.65A
5.07V, 5.12V, 5.17V, 5.22V
5.07V
Input Current Limit and Q1
Input Current Limit
VIN UVLO
Buck Converter/Discharge Mode
Discharge Cut-Off Voltage
VOUT Current Limit
VOUT Voltage
Boost Converter/Charge Mode
4.20V
Battery EOC Voltage
4.35V, 4.20V, 4.15V, 4.1V
(ACT2803QJ-T)
4.35V
(ACT2803QJ-T0435)
Pre-charge voltage threshold
2.8V, 3.0V
2.8V
Pre-charge Current
10%, 15%, 20%, 25%
15%
EOC Current
6%, 10%, 14%, 18%
10%
Fast charge current
60%, 80%, 100%, 120%
100%
System
VCC ON/OFF in HZ Mode
Innovative PowerTM
ON, OFF
- 10 -
OFF
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
CUSTOMER REGISTER MAP
Address
1
2
3
4
5
6
7
8
Name
Master
Config
System
Config
Discharge
Config
Charge
Config
Charge &
System
System
Status
System
Fault
Battery
Fault
Type
R/W
R/W
R/W
R/W
R/W
R
R
R
Reset
Value
8'h00
8'h00
8'h88
8'h99
8'h92
8'h00
8'h00
8'h00
7
Spare
Spare
Spare
Charge
Time after
EOC
0: 0s
1: 45mins
6
Spare
Spare
Spare
Battery PreCondition
Voltage Level
0: 2.8V
1: 3.0V
01: 80%
11: 120%
Battery Fast Charge Current
Level
00: 60%
10: 100%
DC-DC Operation Mode
5
4
3
2
1
Soft Reset
0
LED Always
Display During Discharge
0: Disable
1: Enable
Spare
LED
Breathing
PWM Period
0: 2s
1: 3s
Spare
Spare
01: 10%
11: 18%
Battery EOC Current Level
Spare
0: No Reset
1: Reset
Clear Faults
LED Scan
Disable
01: 2.8V
11: 3.0V
0: No Clear
1: Clear
Faults
Mask
Faults
LED Current
0: Enable
1: Disable
00: 2.7V
10: 2.9V
00: 6%
10: 14%
Thermistor
Thresholds
Spare
Spare
0: Single
1: Dual
Spare
Spare
0: No
Fault
1: Fault
Battery
Low
Spare
0: No Fault
1: Fault
Battery
Trickle/PreCondition
Timer Expire
0: No Fault
1: Fault
Battery
Over Current
0: 120mV
1: 60mV
Cell Balance Hysteresis
Spare
0: No Fault
1: Fault
Battery Short
& Pin Fault
0: No Fault
1: Fault
0: Not Connected
1: Connected
Flash Light
Over-Current
USB Device
Status
Spare
Spare
Battery Discharge Cut-Off
Voltage
0: 3mA
1: 5mA
0: No
Mask
1: Mask
Disable
Battery Cell
Balance
OverTemperature
Discharging
Thermal Foldback
0: No Fault
1: Fault
Battery Cut-Off
0: No Fault
1: Fault
0: Enable
1: Disable
Disable Light
Load
Spare
0: 0s
1: 30s
LED Indication
Lock-out
0: Enable
1: Disable
Force Standby
0: No Force
1: Force
Spare
VIN UVLO
Level
0: 4.2V
1: 4.5V
0: No Latch-Off
1: Latch-Off
HZ Latch-Off
01: 15%
11: 25%
Battery Pre-Condition Current Level
00: 10%
10: 20%
VREG ON/
OFF in HZ
Mode
0: OFF
1: ON
Battery Charging Status
VOUT UV/
OV
0: No Fault
1: Fault
00: Trickle
01: Pre-Condition
10: Fast Charge
11: Top Off
0: No Fault
1: Fault
0: No Fault
1: Fault
Battery OverVoltage
0: No Fault
1: Fault
Battery UnderTemperature
00: Disabled
01: Charge
10: Discharge 11: Not
Used
VIN UV/OV
0: No Fault
1: Fault
Battery Over
Temperature
0: No Fault
1: Fault
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Innovative PowerTM
Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
FUNCTIONAL DESCRIPTION
ACT2803 is a complete battery charging and
discharging power management solution for
applications of dull-cell lithium-based backup
battery pack or power bank.
With the advanced bidirectional architecture, a
synchronous boost/buck converter is connected
from VOUT to switching node (SW). The converter
could be configured as either boost to charge
battery or buck to discharge battery.
Modes of Operation
ACT2803 has 3 operation modes: charge mode,
discharge mode, and high-impedance (HZ) mode.
High Impedance (HZ) Mode
HZ mode is the default mode. In HZ mode, all the
switches are turned off , only PB circuit alive and
the IC draws less than 10uA current from VBAT.
threshold, boost converter charges battery with
constant current. In fast charge state, the ACT2803
charges at the current set by the external resistor
connected at the ICST pin. During a normal charge
cycle fast charge continues in CC mode until VBAT
reaches the charge termination voltage, at which
point the ACT2803 charges in top off state.
Top Off
Device transitions from Fast Charge (CC) to Top
Off (CV), and moves to EOC (End of Charge) state
when charging current is less than IEOC.
End of Charge
In Top Off mode, when charges current decreases
to 10% of set fast charge current, the boost
converter goes into end of charge mode and keep
monitoring the battery voltage.
Recharge
Discharge Mode
In discharge mode, Buck converter operates in CV/
CC regulation. VOUT current limit is set at 2.65A.
Charge Mode
ACT2803 is configured in charge mode (boost
mode) when VIN is valid. In this mode, a battery is
charged with trickle, preconditioning, fast charge,
top-off and end of charge (EOC). The typical
charge management is shown in Figure 1.
Precondition Charge
When operating in precondition state, the cell is
charged at a reduced current at 15% of the
programmed maximum fast charge constant
current. Once VBAT reaches the precondition
threshold voltage the state machine jumps to the
fast charge state.
In EOC, device would re-charge batteries when
both battery voltage levels drops 5% below VEOC.
Battery Removal
If the battery is removed, boost converter regulates
at the programmed regulation voltage.
Cell Balance
Cell Balance is activated in both Fast Charge and
Top Off modes. Each battery is connected with a
parallel bleeding switch.
Push Button
PB is always watched in HZ mode and discharge
mode. If the push but on PB is pressed for >40mS
in HZ mode, the LED (s) will turn on for 5 seconds.
In the mean time, discharge mode is enabled.
Fast Charge
If
battery
voltage
is
above
preconditioning
A: PRECONDITION STATE
B: FAST-CHARGE STATE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
Figure 1. Typical Li+ Charge Profile and ACT2803 Charge States
Innovative PowerTM
- 12 -
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
APPLICATIONS INFORMATION
RLS3
LEDLS1
RLS4
LEDLS2
RLS2
RLS1
LEDLS3
RIMC
HYST
RHYST
LEDLS4
The block diagram in Figure 2 shows how battery
current is sensed for charge current control.
LEDLS3, LEDLS4 to APNG respectively, as shows
in Figure3.
RIMC
Fast Charge Current Control
ACT2803
Figure 2: Battery current monitoring
A small percentage of charge current is sensed and
sinked into a resistor connected at pin ICST. In
charge mode, this would allow user to set fast
charge current based on the following equation.
Ic ( A) 
1000
5 * RCS ( m ) * RICST ( k )
For example,
RICST=8kΩ.
IC=1A
(1)
with
RCS=25mΩ
and
Recommended RICST is shown in following table:
IC (A)
RICST
RCS=50mΩ
0.8
10
5
kΩ
0.9
8.89
4.44
kΩ
1.0
8
4
kΩ
1.1
7.27
3.64
The following equation shows how the external
resistor shifts the LED thresholds. The range of
LED1‐LED4 indicator threshold shift from 5.5V‐
8.8V.
VLEDX (V )  5.5V 
108 k
RLSx ( k )
(3)
VLED Example is given by the below table:
Units
RCS=25mΩ
Figure 3: LED threshold setting
RLSx
(kΩ)
VLEDx
(V)
RLSx
(kΩ)
VLEDx
(V)
40
8.2
72
7
43.2
8
90
6.7
6.5
kΩ
47
7.798
108
7.7
120
6.4
1.2
6.67
3.33
kΩ
49.1
1.3
6.15
3.08
kΩ
57
7.395
135
6.3
1.4
5.71
2.86
kΩ
60
7.3
180
6.1
1.5
5.33
2.67
kΩ
67.5
7.1
270
5.9
During discharge mode, inputs of battery current
sense amp are flipped to sense discharge current,
and voltage level at pin ICST can be used (by the
system) to monitor the magnitude of discharge
current based on the following equation.
V ICST 
I DISCHARGE  R ICST
20 k 
(2)
For example: VICST=0.4V with I_DISCHARGE=1A,
and RICST=8kΩ.
LED Threshold Setting
LED1, LED2, LED3 and LED4 thresholds are
adjustable with external resistors RLS1, RLS2, RLS3,
and RLS4 connected from LEDLS1, LEDLS2,
Innovative PowerTM
- 13 -
LED Hysteresis Window Setting
The adjustable LED voltage thresholds are set for
HZ mode. In charge mode, the measured battery
voltage is higher than in HZ mode, while in
discharge mode, the measured battery voltage is
lower. To have relatively better “fuel gauge” for
battery, a programmable hysteresis window will
help. When the battery voltage goes up (in charge
mode), the thresholds become higher, when the
battery voltage goes down, lower thresholds are
applied.
ACT2803 provide HYST pin to set hysteresis
window for each indication level as shows in Figure
3.
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
APPLICATIONS INFORMATION
current source provides a bias current to generate
TH voltage. The ACT2803 compares the voltage at
the TH pin with the internal VTHH and VTHL
thresholds to determine if charging or discharging is
allowed. When VTH<VTHL or VTH >VTHH, it will be
triggered latch off fault, there is 3 ways to wake up
ACT2803 when VTH returns to the normal range.
HYST pin is regulated at 1V. Its input current will
determine hysteresis adjustment equally to all level.
Connect HYST to APGN via a resistor to set
hysteresis window.
Beside the hysteresis window, to avoid comparison
oscillation, fixed 100mV of hysteresis is added to
each LEVEL comparator.
1. Push PB when latch off bit is not set
2. I2C to clear faults in standby
3. Plug Vin to power up
Hysteresis window is given by below equation:
HYST (V ) 
4 
54K
R HYST K  
ACT2803
5
VHYST 4 : 3  0.5* HYST VHYST 2 :1  0.6* HYST
CHG_HOT
+
ICHG=140uA
VTC L= 1V
–
RHYST Example is given by the below table:
CHG_COLD
RHYST (kΩ)
LED1
VHYST
LED2
VHYST
LED3
VHYST
LED4
VHYST
Floating
0mV
0mV
0mV
0mV
270
120mV
120mV
100mV
100mV
135
240mV
240mV
200mV
200mV
VTC H=2.5V
–
DIS_HOT
90
360mV
360mV
300mV
300mV
480mV
480mV
400mV
400mV
54
600mV
600mV
500mV
500mV
45
720mV
720mV
600mV
600mV
400
600
700
RCS = 25 mΩ
540k 270k 180k 135k 108k 90k
77k
RCS = 50 mΩ
1080k 540k 360k 270k 216k 180k 154k
(7 )
V TCH  I CHG  Rcold
(8)
Battery Temperature Monitering
The ACT2803 monitors the battery pack
temperature by measuring TH voltage at the TH pin
as shows in Figure 4. The TH pin is connected to
the thermistor resistor net which includes a negative
temperature coefficient thermistor. An internal
Innovative PowerTM
NTC
+
VTCL  I CHG  Rchot
( 6)
500
VTD L=0.57V
Figure 4: Thermistor setting
RIMC example is given by the below table:
300
Li+ Battery
Pack
VTD H=2.5V
In case not using compensation, float RIMC then
there is no compensation affects to trig-points.
200
Rb
–
To avoid the number of LEDs changes between
charge and discharge modes. Internal impedance
compensation circuit is built in. An external resistor
is used to set the impedance from 100mΩ to
800mΩ. RIMC is corresponding to battery
impedance. The LED1-4 thresholds shifted up and
down based on the product of charge/discharge
current and set impedance. RIMC value is given by
below equation.
100
TH
Ra
DIS_COLD
Battery Impedance Compensation
RBAT (mΩ)
+
IDIS=100uA
–
67.5
R (m )
RIMC ( k )  2160 k  CS
RBAT ( m  )
+
- 14 -
Rchot  Rb 
Ra RNTCh
Ra  RNTCh
(9)
Rcold  Rb 
Ra  RNTCc
Ra  RNTCc
(10)
RNTCc : NTC Resistor at cold temperature (Tcold)
RNTCh : NTC Resistor at hot temperature (Thot)
From (7) (8) (9) and (10) calculate Ra and Rb in
charge mode, as the same method, the resistors in
discharge mode can be calculated.
For example, use NXRT15XH103 NTC resistor, the
temperature in charge mode is 0℃ to 45℃,we
know RNTCC=27.219k and 4.917k at 0℃ to 45℃,
respectively. We can calculate Ra=33kΩ and
Rb=2.87kΩ based on the above formulas. As the
same method we can calculate the value when the
temperature is -20℃ to 60℃.
Cell Balance Setting
ACT2803 has integrated a cell balance feature to
reduce the un-balance charge between dual
batteries. Normally cell balance is activated during
Fast Charge and Top Off modes.
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
APPLICATIONS INFORMATION
In charge mode, the battery charger provides bias
current to balance battery charge. The balance
resistor is either connected to upper battery or
lower battery depending on which battery voltage is
higher. The balance resistor is connected in parallel
with one battery that is higher than the other
battery. For extremely unbalanced 2S batteries, the
charger takes a few cycles to make two battery
voltage balanced. For some applications, like
removable dual cell batteries, a charger is required
to balance dual cells in one charge cycle. In this
case, the circuit shown in Figure 5 is recommended.
The balance current through the 22 Ohm
resistor needs to be higher than EOC current
threshold.
the LEDs are 0.5Hz with 1s on and 1s off.
In HZ mode, when PB is pressed for 40ms, Buck
turns on. If VBAT<LED1, LED1 starts flashing until
Buck turns off.
Conventional indication patterns could behave to
have two application. Setting RPT=4kΩ to have
“Always On”, setting RPT=12kΩ to have “5s
Indication”. The behaviors for both setting are same
in charge mode.
See below table for more information.
#
INDICATION PATTERN
RPT
1a
Conventional
Always On In Discharge
4kΩ
1b
Conventional
5s Indication in Discharge
12kΩ
2
Breathing
5s Indication in Discharge
24kΩ
3
Bottom Charging
5s Indication in Discharge
40kΩ
4
Circulating
5s Indication in Discharge
56kΩ
Below shows 4 LED indication patterns.
Figure 5: Cell balance
LED Indication
ACT2803 is designed 5 levels of PT pin voltage into
5 application patterns. A resistor is connected from
PT pin to ground and the voltage at PT pin
programs the LED indication patterns shown in
Figure 6 .
LED1-4 Refreshing Cycle
Every time when VIN is plugged in or a PB is
pushed, LED1, 2, 3, 4 turns on sequentially at 0.5s
interval, like a LED scanning, and then goes into
corresponding mode defined by PT pin.
LED1-4 Fault Alarm Signal
At fault conditions, actions are taken. In the
meantime, all the 4 LEDs turn on/off with 0.5s on
and 0.5s off for 10 seconds to send alarm signal
out. The fault conditions include battery OVP, UVP,
OTP.
PCB Board Layout Guidance
Figure 6: LED Indication
In discharge mode, when battery voltage goes
below LED1 threshold, LED1 starts flashing until
Buck (discharge mode) turns off due to either light
load or Buck UVLO. The flash frequencies for all
Innovative PowerTM
- 15 -
When laying out the printed circuit board, the
following checklist should be used to ensure proper
operation of the IC.
1. Arrange the power components to reduce the
AC loop area.
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
APPLICATIONS INFORMATION
2. Place the decoupling ceramic capacitor as
close to BAT pin as possible. Use different
capacitance combination to get better EMI
performance.
3. Place the decoupling ceramic capacitors close
to VIN pin, VOUT pin, and BAT pin.
4. Use copper plane for power GND for best heat
dissipation and noise immunity.
5. Connect battery with the sequence of BATN>BATP->BATC.
6. Use Kevin sense from sense resistors to CSP
and CSN pins, and the sense resistor from
BATS and BATP pins.
7. SW pad is a noisy node switching. It should be
isolated away from the rest of circuit for good
EMI and low noise operation.
8. Thermal pad is connected to GND layer through
vias. PGND and AGND should be single-point
connected.
9. RC snubber and external Schottky diode across
SW to PGND can be added as needed for
reducing SW spike and better EMI
performance.
Innovative PowerTM
- 16 -
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
Figure 7. ACT2803 typical application circuit
(Input current limit 2.75A, fast charge current limit 1.0A, discharge output constant current 2.4A)
Charge: Cold: 0°C, Hot: 45°C. Discharge: Cold: -20°C, Hot: 60°C.
Innovative PowerTM
- 17 -
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
Table 5: BOM List
Item
Reference
Description
QTY
Manufacturer
1
2
L1
D1
SWPA8040S4R7NT 4.7uH 5.9A(8*8*4mm)
MBR1020VL, 20V/1A Schottky, SMA, Optional
1
1
Sunlord
Panjit
3
C1
Ceramic capacitor, 10uF/16V, X7R, 1206
1
Murata/TDK
4
C2
Ceramic capacitor, 4.7uF/10V, X7R, 0805
1
Murata/TDK
C3,C10,C11,C12 Ceramic capacitor, 22uF/10V, X7R, 1206
4
Murata/TDK
Ceramic capacitor, 22uF/16V, X7R, 1206
Ceramic capacitor, 47nF/16V, X7R, 0603
Ceramic capacitor, 0.1uF/16V, X7R, 0603
Ceramic capacitor, 2.2nF/10V, X7R, 0603
Ceramic capacitor, 1uF/10V, X7R, 0603
Ceramic capacitor, 2.2uF/10V, X7R, 0603
Ceramic capacitor, 3.3uF/10V, X7R, 0603
Ceramic capacitor, 100nF/10V, X7R, 0603
Chip Resistor, 2.7Ω, 1/8W, 5%, 0805
Chip Resistor, 25mΩ, 1/2W, 1%, 1206
Chip Resistor, 8kΩ, 1/10W, 1%, 0603
Chip Resistor, 83kΩ, 1/10W, 1%, 0603
3
1
2
1
1
1
1
1
1
2
1
1
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
SART
Murata/TDK
Murata/TDK
5
6
7
8
9
10
11
12
13
14
15
16
17
C5,C7,C8
C4
C6,C13
C14
C15
C16
C19
C20
R1
R2,R3
R5
R6
18
R7
Chip Resistor, 63.5kΩ, 1/10W, 1%, 0603
1
Murata/TDK
19
R8
Chip Resistor, 51.4kΩ, 1/10W, 1%, 0603
1
Murata/TDK
20
21
R9
R10,R11
Chip Resistor, 41.5kΩ, 1/10W, 1%, 0603
Chip Resistor, 540kΩ, 1/10W, 1%, 0603
1
2
Murata/TDK
Murata/TDK
22
R12
Chip Resistor, 0.47Ω, 1/8W, 1%, 0805
1
Murata/TDK
23
R14,R26
Chip Resistor, 715kΩ, 1/10W, 5%, 0603
2
Murata/TDK
24
R15
Chip Resistor, 12kΩ, 1/10W, 1%, 0603
1
Murata/TDK
25
R17
Chip Resistor, 10Ω, 1/10W, 5%, 0603
1
Murata/TDK
26
R24
Chip Resistor, 47Ω, 1/2W, 1%, 1206
1
Murata/TDK
27
R27
Chip Resistor, 100Ω, 1/10W, 1%, 0603
1
Murata/TDK
28
R30,R31
Chip Resistor, 510Ω, 1/10W, 5%, 0603
2
Murata/TDK
29
R32
Chip Resistor, 3kΩ, 1/10W, 1%, 0603
1
Murata/TDK
30
R33
Chip Resistor, 32kΩ, 1/10W, 1%, 0603
1
Murata/TDK
31
RNTC
103AT NTC Thermistor, NXRT15XH103V
1
Murata
LED, 0603, Blue
4
LED Manu
Push Button Switch
1
33
LED1,LED2,
LED3,LED4
PB
34
Output USB
10.2*14.6*7mm,4P
1
35
Micro-USB
MICRO USB 5P/F SMT B
1
36
U1
IC, ACT2803 QFN 5X5-40
1
32
Innovative PowerTM
- 18 -
ACT
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified)
Battery Charge V/I Profile
Charge Current vs. Output Current
Input Current (mA)
2500
2000
Charge Current (mA)
VIN = 5.0V
ICHRG=1.0A
Input Current
1500
Output Current
1000
Charge Current
500
VIN = 5.0V
ICHRG = 1.0A
1000
800
600
400
200
0
0
ACT2803-002
1200
ACT2803-001
3000
0
4
8
12
16
20
24
28
0
0.5
1.0
1.5
Test Point
3.0
3.5
4.0
4.5
Discharge Efficiency
ACT2803-004
100.0
ACT2803-003
VIN = 5.0V
ICHRG = 1.0A
90.0
Efficiency(%)
95.0
Efficiency(%)
2.5
Vbat (V)
Charge Efficiency
96.0
2.0
94.0
93.0
92.0
80.0
VBAT = 6.0V
VBAT = 7.0V
400
1200
VBAT = 8.4V
70.0
60.0
91.0
50.0
90.0
5.5
6.0
6.5
7.0
7.5
8.0
0
8.5
2400
2800
1000
Battery Leakage (µA)
VIN = 5.0V
VBAT = 7.0V
800
600
400
200
0
ACT2803-006
25.0
ACT2803-005
1400
Battery Charge Current (mA)
2000
Battery Leakage vs. Junction Temperature
(HZ Mode)
Battery Charge Current vs. Junction
Temperature
-20
1600
Output Current (mA)
Vbat (V)
1200
800
20.0
15.0
VBAT = 7.0V
VBAT = 8.2V
10.0
5.0
0
0
20
40
60
80
100
120
140
-20
Temperature (°C)
Innovative PowerTM
0
20
40
60
80
100
120
Temperature (°C)
- 19 -
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified)
Buck Output Voltage vs. Output Current
buck Output Voltage (V)
VBAT = 8.4V
CV= 4.0V
Rcs=25mΩ(1%)
2700
5.25
2650
2600
2550
2500
2450
ACT2803-008
2750
ACT2803-007
Buck Output Constant Current (mA)
Buck Output Constant Current Limit
vs. Temperature
5.20
5.15
VBAT =8.4V
5.10
5.05
5.00
VBAT=6.0V
4.95
-30
0
30
60
90
120
150
0
500
Temperature (°C)
2000
2500
3000
Buck Output CC/CV
6.0
Buck Output Voltage (V)
2700
2680
2660
2640
2620
2600
5.0
ACT2803-010
2720
ACT2803-009
VBAT = 6.0V
4.0
3.0
VBAT = 8.2V
2.0
1.0
0
5.8
6.2
6.6
7.0
7.4
7.8
8.2
8.6
0
500
1000
1500
2000
2500
Vbat (V)
Output1 Current (mA)
Buck Standby Current vs. Battery Voltage
Battery Leakage vs. Battery Voltage
(HZ Mode)
1.1
6.0
1.0
0.9
0.8
0.7
3000
ACT2803-012
7.0
ACT2803-011
1.2
Battery Leakage (µA)
Buck Output Constant Current (mA)
1500
Buck Output Current (mA)
Buck Output Constant Current Limit vs. VBAT
Standby Current (mA)
1000
5.0
4.0
3.0
2.0
1.0
0.6
0
5.8
6.2
6.6
7.0
7.4
7.8
8.2
8.6
0
Battery Voltage (V)
Innovative PowerTM
2.0
4.0
6.0
8.0
10.0
12.0
14.0
Battery Voltage(V)
- 20 -
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified)
Buck Load Transient
(Iout:1A-2.4A-1A)
Buck Load Transient
(Iout: 80mA-1A-80mA, )
VBAT = 8.2V
VOUT = 5.0V
ACT2803-014
ACT2803-013
VBAT = 8.2V
VOUT = 5.0V
CH1
CH1
CH2
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 1ms/div
CH1: VOUT, 200mV/div
CH2: IOUT, 500mA/div
TIME: 1ms/div
Innovative PowerTM
- 21 -
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Copyright © 2016 Active-Semi, Inc.
ACT2803
Rev 1, May-12-2016
PACKAGE OUTLINE
QFN55-40 PACKAGE OUTLINE AND DIMENSIONS
SYMBOL
DIMENSION IN
MILLIMETERS
DIMENSION IN
INCHES
MIN
MAX
MIN
MAX
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A3
0.203 REF
0.008 REF
b
0.150
0.250
0.006
0.010
D
4.924
5.076
0.194
0.200
E
4.924
5.076
0.194
0.200
D1
3.300
3.500
0.130
0.138
E1
3.300
3.500
0.130
0.138
e
L
k
0.400 TYP
0.324
0.476
0.200 MIN
0.016 TYP
0.013
0.019
0.008 MIN
Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each
product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use
as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of
the use of any product or circuit described in this datasheet, nor does it convey any patent license.
Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact
[email protected] or visit http://www.active-semi.com.
is a registered trademark of Active-Semi.
Innovative PowerTM
- 22 -
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Copyright © 2016 Active-Semi, Inc.
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