ACT2804 Datasheet

ACT2804
Rev 2, Feb-04-2016
5V/3.4A Dual Cell Backup Battery Power Manager
 Battery Over-charge and Over-discharge
FEATURES
 Dedicated Single-chip Integrated Battery Power
Manager

 Dual Cell Battery Charger with Cell Balancing

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
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Protections
 Charge/Discharge Thermal Regulation
TQFN5x5-40 Package
APPLICATIONS
Management
Auto Detection support USB BC1.2, Chinese
YD/T 1591-2009, Apple 2.4A, and Samsung
Devices
Passed Apple MFi Test
4.5V-5.5V Input Voltage with 3.4A Input Current
Limit
2.4A+1.0A Dual Outputs with CC Regulation
5.07V+/-1% Output with Prioritized Power Path
from Input to Output
4.2V/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 3.4A
Output for Full Battery Range
4 Modes of LED Operation
Preconditioning for Deeply Depleted Battery
Weak Input Sources Accommodation
Safety:
 Input Over-voltage Protection
 Nearly Zero Power Short Circuit Protection
 Output Over-voltage Protection




Backup Battery Pack
Power Bank
Mobile Power
Standalone Battery Charger with USB Output
GENERAL DESCRIPTION
ACT2804 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, ACT2804 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.
ACT2804 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 .
ACT2804 is available in a thermally enhanced
5mmx5mm QFN55-40 package with exposed pad.
Buck Output CC/CV
1uF
6.0
22uF
VOUT2
5.07V/2.4A
VOUT1
5.07V/1A
LED4 LED3 LED2 LED1 VREG
BAT
VIN
22uF
25mΩ
CSN2
BATS
CSP
BATP
CSN1
25mΩ
4.7uH
ACT2804
22uF
22uF
PGND
HSB
510Ω
CBD
47Ω
BATN
RIMC ICS T
540k
25mΩ
BATC
VOUT
SW
47nF
22uF
Buck Output Voltage (V)
VIN
4.5V-5.5V
8k
TH
PB AGND
510Ω
10k
5.0
VBAT = 6.0V
4.0
3.0
1A Output
2.4A Output
VBAT = 8.2V
2.0
1.0
0
0
500
1000
1500
2000
2500
3000
Output Current (mA)
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-1-
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Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
ORDERING INFORMATION
PART NUMBER
BATTERY CELL VOLTAGE
JUNCTION TEMPERATURE
PACKAGE
PINS
ACT2804QJ-T
4.20V
-40˚C to 150˚C
QFN55-40
40
ACT2804QJ-T0435
4.35V
-40˚C to 150˚C
QFN55-40
40
LED4
LEDLS1
LEDLS2
LEDLS3
LEDLS4
PT
RIMC
HYST
DM
DP
PIN CONFIGURATION
CSN2
LED3
CSN1
LED2
CSP
LED1
VOUT
PB
VOUT
AGND
ACT2804
VIN
VREG
TH
VIN
OVGATE
ICST
PGND
OVSENS
BATN
BATC
BATP
BATS
BAT
BAT
SW
SW
HSB
PGND
CBD
SDA
SCL
TOP VIEW
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Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
PIN DESCRIPTIONS
PIN
NAME
1
CSN2
Output current sense negative input for channel 2.
2
CSN1
Output current sense negative input for channel 1.
3
CSP
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 BAT pin to
PGND pin with high quality ceramic capacitors on the same layer with IC.
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
Innovative PowerTM
DESCRIPTION
Output current sense positive input.
Power Output Pin.
USB or AC Adapter input.
Power ground. Directly connect this pin to IC thermal PAD and connect 10uF or 22uF high
quality capacitors from BAT to PGND on the same layer with IC.
Temperature sensing input. Connect to a battery thermistor terminal.
+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.
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Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
PIN DESCRIPTIONS
PIN
NAME
26
AGND
27
PB
28
LED1
Battery level indicator.
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
37
RIMC
RIMC Battery impedance compensation input.
38
HYST
The hysteresis window setting input. Connect a resistor at the pin to set the hysteresis windows for LED1, 2, 3, 4.
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
Logic ground output. Connect this pin to the exposed PGND pad on same layer with IC.
Push button input. When this pin is pushed for more than 40ms, LED1-4 indicators are enabled for 5 seconds.
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.
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.
ACT2804
Rev 2, Feb-04-2016
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 CSN2, CSP to CSN1, 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.
ACT2804
Rev 2, Feb-04-2016
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
5.9
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
3.4
+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 (ACT2804QJ-T)
-0.5%
4.2
+0.5%
V
VBAT_EOC (ACT2804QJ-T0435)
-0.5%
4.35
+0.5%
V
Battery End-Of-Charge Voltage
End of Charge Detection Current
Percentage of fast charge current
10
%
VABT falling, VBAT1, 2
2.9
V
REG3[1:0]=00
5.07
V
REG3[1:0]=01
5.12
V
REG3[1:0]=10
5.17
V
REG3[1:0]=11
5.22
V
Buck mode/Discharge
Buck Under Voltage Lock-Out
VOUT Output Regulation Voltage
RCS1=25mΩ, ICC1
1.05
1.25
1.40
A
RCS2=25mΩ, ICC2
2.45
2.65
2.85
A
VOUT1 and VOUT2 Current Limit
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Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
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
10
15
12.5
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
1
V
0.57
V
50
mA
If timer expires, goes to latch-off
TH Pull-up Current
TH High Threshold
Charge mode
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
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Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
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.
ACT2804
Rev 2, Feb-04-2016
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
SCL Clock Frequency, fSCL
0
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.
ACT2804
Rev 2, Feb-04-2016
FUNCTIONAL DESCRIPTION
ACT2804 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.
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 ACT2804 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
In EOC, device would re-charge batteries when
both battery voltage levels drops 5% below VEOC.
Modes of Operation
ACT2804 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.
Discharge Mode
In discharge mode, Buck converter operates in CV/
CC regulation. VOUT1 current limit is set at 1.25A
and VOUT2 current limit is set at 2.65A.
Charge Mode
ACT2804 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.
Fast Charge
If battery voltage is above preconditioning
threshold, boost converter charges battery with
constant current. In fast charge state, the ACT2804
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.
VEOC
RECHARGE
FAST CHARGEB CURRENT
Current
A: PRECONDITION STATE
B: FAST-CHARGE STATE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
Voltage
VPRECHARGE
END-OF-CHARGE CURRENT
PRECONDITION CHARGE CURRENT
STATE
A
B
C
D
B
Figure 1. Typical Li+ Charge Profile and ACT2804 Charge States
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- 10 -
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ACT2804
Rev 2, Feb-04-2016
APPLICATIONS INFORMATION
LEDLS3, LEDLS4 to APNG respectively, as shows
in Figure3.
Fast Charge Current Control
The block diagram in Figure 2 shows how battery
current is sensed for charge current control.
Io
Iin
VIN
Output
VOUT
Cin
RHY ST
RIMC
RLS2
RLS1
RLS3
RLS4
Cout1
L
ACT2804
SW
Battery2
LEDLS1
LEDLS2
Battery1
RCBD
47
LEDLS3
CBD
LEDLS4
BAT
RIM C
RCS
25m
ICST
RICST
HYS T
Input
ACT2804
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)
(1)
For example, IC=1A with RCS=25mΩ and
RICST=8kΩ.
Recommended RICST is shown in following table:
IC (A)
RICST
Units
RCS=25mΩ
RCS=50mΩ
0.8
10
5
kΩ
0.9
8.89
4.44
kΩ
Figure 3: LED threshold setting
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 
108k
R LSx ( k)
(3)
RLSx
(kΩ)
VLEDx
(V)
RLSx
(kΩ)
VLEDx
(V)
40
8.2
72
7
43.2
8
90
6.7
1.0
8
4
kΩ
47
7.798
108
6.5
1.1
7.27
3.64
kΩ
49.1
7.7
120
6.4
1.2
6.67
3.33
kΩ
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.
VICST 
I DISCHARGE  RICST
20k
VLED Example is given by the below table:
LED Hysteresis Window Setting
(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
- 11 -
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.
ACT2804 provide HYST pin to set hysteresis
window for each indication level as shows in Figure
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ACT2804
Rev 2, Feb-04-2016
APPLICATIONS INFORMATION
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.
Hysteresis window is given by below equation:
HYST (V ) 
54K
RHYST K 
VHYST 4 : 3  0.5 * HYST
TH voltage. The ACT2804 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
ACT2804 when VTH returns to the normal range.
1. Push PB when latch off bit is not set
2. I2C to clear faults in standby
3. Plug Vin to power up
4
ACT2804
CHG_HOT
5
VHYST 2 : 1  0.6 * HYST
LED2
VHYST
LED3
VHYST
LED4
VHYST
Floating
0mV
0mV
0mV
0mV
270
120mV
120mV
100mV
100mV
135
240mV
240mV
200mV
200mV
DIS_HOT
90
360mV
360mV
300mV
300mV
480mV
480mV
400mV
400mV
54
600mV
600mV
500mV
500mV
45
720mV
720mV
600mV
600mV
100
200
300
400
600
V TCH  I CHG  Rcold
(8)
700
540k 270k 180k 135k 108k 90k 77k
1280k 540k 360k 270k 216k 180k 154k
BATTERY TEMPERATURE MONITERING
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℃.
LED Indication
The ACT2804 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
current source provides a bias current to generate
Innovative PowerTM
NTC
VTDH=2.5V
(7 )
(6)
500
Li+ Battery
Pack
VTCL  I CHG  Rchot
RIMC example is given by the below table:
RBAT (mΩ)
Rb
Figure 4: Thermistor setting
In case not using compensation, float RIMC then
there is no compensation affects to trig-points.
RCS = 25 mΩ
RCS = 50 mΩ
TH
+
–
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.
RCS (m)
RBAT (m)
IDIS=100uA
VTDL=0.57V
Ra
Battery Impedance Compensation
RIMC (k)  2160k 
+
VTCH=2.5V
–
DIS_COLD
67.5
+
–
Then RHYST Example is given by the below table:
LED1
VHYST
ICHG=140uA
VTCL=1V
–
CHG_COLD
RHYST (kΩ)
+
ACT2804 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.
- 12 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
APPLICATIONS INFORMATION
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.
LED4 LED3 LED2 LED1 VREG
BAT
BATS
BATP
BATC
CBD
LED1-4 Fault Alarm Signal
ACT2804
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.
PB
GND
BATN
LEDS4 LEDS3 LEDS2 LEDS1 PT
RS4
RS3
RS2
RS1
PCB Board Layout Guidance
RPT
Figure 5: 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
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
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.
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. Use Kevin sense from sense resistors to CSP
and CSN1, CSN2 pins, and the sense resistor
from BATS and BATP pins.
6. SW pad is a noisy node switching. It should be
isolated away from the rest of circuit for good
EMI and low noise operation.
7. Thermal pad is connected to GND layer through
vias. PGND and AGND should be single-point
connected.
8. RC snubber and external Schottky diode across
SW to PGND can be added as needed for
reducing
SW
spike and
better
EMI
performance.
Below shows 4 LED indication patterns.
Conventional
Bottom
Charging
Circulating
Breathing
<25%
25% SOC<50%
50% SOC<75%
75% SOC<100%
EOC
Flash
Circulating on
Breathing on/off
Off
Innovative PowerTM
Always on
- 13 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
APPLICATIONS SCHEMATIC
R23
R22
R12 R11 R10 R9 R8 R7 R6
C15
R2A
Output
USB 1
+
DD+
-
R2
R21
C17
Q1
LED4
LEDLS1
LED2
CSP
LED1
VOUT
PB
VOUT
GND
ACT2804
C13
R17
R5
BATN
R18
BATC
BATP
BATS
BAT
BAT
SW
SW
HSB
PGND
MCU
S1
R NTC
CBD
SDA
R20
Optiona l
LED1
ICS T
PGND
SCL
R1
LED2
TH
OVS ENS
+
DD+
-
LED3
VREG
VIN
OVG ATE
Input
USB
LED4
LED3
CSN1
VIN
C2
LEDLS2
PT
CSN2
LEDLS3
R3A
LEDLS4
C16
RIMC
DP
+
DD+
-
HYST
Output
USB 2
DM
R3
R15
C14
C1
C7
R16
R14
R4
C8
R19
BAT1
R4A
L1
BAT2
D1
C3 C4 C5 C6
R13
C9 C10
C11
Optiona l
C12
Figure 6. ACT2804 typical application circuit
(Input current limit 3.4A, fast charge current limit 1.0A, discharge output constant current 2.4A+1A)
Charge: Cold: 0°C, Hot: 45°C. Discharge: Cold: -20°C, Hot: 60°C.
Innovative PowerTM
- 14 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
Table 5: BOM List
ITEM
REFERENCE
1
C1
2
DESCRIPTION
QTY
MANUFACTURER
Ceramic capacitor, 4.7uF/10V, X7R, 0805
1
Murata/TDK
C2,C3,C4,C5,C8, C9,C11 Ceramic capacitor, 22uF/16V, X7R, 1206
7
Murata/TDK
3
C6,C10
Ceramic capacitor, 0.1uF/16V, X7R, 0603
2
Murata/TDK
4
C7
Ceramic capacitor, 47nF/10V, X7R, 0603
1
Murata/TDK
5
C12
Ceramic capacitor, 2.2nF/16V, X7R, 0603
1
Murata/TDK
6
C13
Ceramic capacitor, 1uF/10V, X7R, 0603
1
Murata/TDK
7
C14
Ceramic capacitor, 100nF/16V, X7R, 0603
1
Murata/TDK
C15
Ceramic capacitor, 2.2uF/10V, X7R, 0603
1
Murata/TDK
9
C16,C17
Ceramic capacitor, 3.3uF/10V, X7R, 0603
2
Murata/TDK
10
D1
MBR1020VL, 20V, 1A Schottky, optional
1
Panjit
11
L1
Core SWPA8040S4R7NT 4.7uH 5.9A
1
Sunlord
4
LED Manu
12
LED1,LED2, LED3,LED4 LED, 0603, Blue
13
R1
Chip Resistor, 2.7Ω, 1/8W, 1%, 0805
1
Murata/TDK
14
R2,R2A,R3,R3A,R4,R4A
Chip Resistor, 50mΩ, 1/2W, 1%, 1206
6
SART
15
R5
Chip Resistor, 8kΩ, 1/10W, 1%, 0603
1
Murata/TDK
16
R6
Chip Resistor, 83kΩ, 1/10W, 1%, 0603
1
Murata/TDK
17
R7
Chip Resistor, 63.5kΩ, 1/10W, 1%, 0603
1
Murata/TDK
18
R8
Chip Resistor, 51.4kΩ, 1/10W, 1%, 0603
1
Murata/TDK
19
R9
Chip Resistor, 41.5kΩ, 1/10W, 1%, 0603
1
Murata/TDK
20
R10
Chip Resistor, 12kΩ, 1/10W, 5%, 0603
1
Murata/TDK
21
R11,R12
Chip Resistor, 540kΩ, 1/10W, 1%, 0603
2
Murata/TDK
22
R13
Chip Resistor, 0.47Ω, 1/8W, 5%, 0805
1
Murata/TDK
23
R14,R16
Chip Resistor, 510Ω, 1/10W, 1%, 0603
2
Murata/TDK
24
R15
Chip Resistor, 47Ω, 1/4W, 5%, 1206
1
Murata/TDK
25
R17
Chip Resistor, 3k, 1/10W, 1%, 0603
1
Murata/TDK
26
R18
Chip Resistor, 32k, 1/10W, 1%, 0603
1
Murata/TDK
27
R19
Chip Resistor, 10Ω, 1/10W, 1%, 0603
1
Murata/TDK
28
R20
Chip Resistor, 200Ω, 1/10W, 5%, 0603, optional
1
Murata/TDK
29
R21
Chip Resistor, 100Ω, 1/10W, 5%, 0603
1
Murata/TDK
30
R22, R23
Chip Resistor, 715kΩ, 1/10W, 5%, 0603
2
Murata/TDK
31
RNTC
103AT NTC Thermistor, NXRT15XH103V
1
Murata
32
Q1
8205A, Rdson < 25mΩ at VGS = 4.5 V, optional
1
TY
33
PB
Push Button Switch
1
Nikkai Omron
34
USB
10.2*14.6*7mm, 4P
2
35
Micro-USB
MICRO USB 5P/F SMTB
1
36
U1
IC, ACT2804, QFN 55-40
1
Innovative PowerTM
- 15 -
Active-Semi
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified)
Battery Charge V/I Profile
Charge Current vs. Output Current
Input Current (mA)
2500
Charge Current (mA)
VIN = 5.0V
3000
Input Current
2000
Output Current
1500
Charge Current
1000
ACT2804-002
1200
ACT2804-001
3500
VIN = 5.0V
ICHRG = 1.0A
1000
800
600
400
200
500
0
0
0
5
10
15
20
25
30
0
0.5
1.0
1.5
2.0
Test Point
4.5
VIN = 5.0V
ICHRG = 1A
3500
4000
ACT2804-004
ACT2804-003
VBAT = 6.0V
95.0
Efficiency(%)
Efficiency(%)
4.0
100.0
94.0
93.0
92.0
VBAT = 7.5V
90.0
VBAT = 8.4V
85.0
80.0
91.0
90.0
75.0
5.5
6.0
6.5
7.0
7.5
8.0
0
8.5
500
1000
1500
2000
2500
3000
Output Current (mA)
Vbat (V)
Battery Leakage vs. Junction Temperature
(HZ Mode)
Battery Charge Current vs. Junction
Temperature
1200
1000
Battery Leakage (µA)
VIN = 5.0V
VBAT = 7.5V
800
600
400
ACT2804-006
25.0
ACT2804-005
Battery Charge Current (mA)
3.5
Discharge Efficiency
95.0
1400
3.0
Vbat (V)
Charge Efficiency
96.0
2.5
20.0
15.0
VBAT = 7.0V
VBAT = 8.2V
10.0
5.0
200
0
0
-20
0
20
40
60
80
100
120
140
-20
Temperature (°C)
Innovative PowerTM
0
20
40
60
80
100
120
Temperature (°C)
- 16 -
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Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
Buck Output1 Constant Current Limit
vs. Temperature
1250
Buck Output2 Constant Current (mA)
VBAT = 8.4V
CV= 4.0V
Rcs=25mΩ(1%)
1200
1150
1100
1050
1000
-30
0
30
60
90
120
2750
VBAT = 8.4V
CV= 4.0V
Rcs=25mΩ(1%)
2700
2650
2600
2550
2500
2450
150
-30
0
30
Temperature (°C)
Buck Output1 Voltage vs. Output Current
150
buck Output2 Voltage (V)
5.15
VBAT =8.4V
5.05
VBAT=6.0V
ACT2804-0010
Buck Output1 Voltage (V)
120
Buck Output2 Voltage vs. Output Current
4.95
5.20
5.15
VBAT =8.4V
5.10
5.05
5.00
VBAT=6.0V
4.95
0
200
400
600
800
1000
1200
1400
0
500
Buck Output1 Current (mA)
Buck Output2 Constant Current (mA)
1210
1200
1190
1180
6.6
7.0
7.4
7.8
8.2
8.6
2500
3000
2720
2700
2680
2660
2640
2620
2600
5.8
Vbat (V)
Innovative PowerTM
2000
ACT2804-012
1230
6.2
1500
Buck Output2 Constant Current Limit vs. VBAT
ACT2804-011
1240
5.8
1000
Buck Output2 Current (mA)
Buck Output1 Constant Current Limit vs. VBAT
Buck Output1 Constant Current (mA)
90
5.25
ACT2804-009
5.20
5.00
60
Temperature (°C)
5.25
5.10
ACT2804-008
1300
Buck Output2 Constant Current Limit
vs. Temperature
ACT2804-007
Buck Output1 Constant Current (mA)
(Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified)
6.2
6.6
7.0
7.4
7.8
8.2
8.6
Vbat (V)
- 17 -
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Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified)
Battery Leakage vs. Battery Voltage
(HZ Mode)
Buck Standby Current vs. Battery Voltage
6.0
Battery Leakage (µA)
Standby Current (mA)
1.1
ACT2804-014
7.0
ACT2804-013
1.2
1.0
0.9
0.8
0.7
5.0
4.0
3.0
2.0
1.0
0
0.6
5.8
6.2
6.6
7.0
7.4
7.8
8.2
8.6
2.0
0
Battery Voltage (V)
Buck Output1 CC/CV
8.0
10.0
12.0
14.0
Buck Output2 CC/CV
Buck Output2 Voltage (V)
VBAT = 6.0V
4.0
VBAT = 8.2V
2.0
1.0
5.0
ACT2804-016
5.0
6.0
ACT2804-015
Buck Output1 Voltage (V)
6.0
Battery Voltage(V)
6.0
3.0
4.0
VBAT = 6.0V
4.0
3.0
VBAT = 8.2V
2.0
1.0
0
0
0
200
400
600
800
1000
1200
0
500
Output1 Current (mA)
1500
2000
2500
3000
Output2 Current (mA)
Buck Load Transient
(Iout2:1A-2.4A-1A, Iout1: 0A)
Buck Load Transient
(Iout2: 80mA-1A-80mA, Iout1: 0A)
ACT2804-018
ACT2804-017
VBAT = 8.2V
VOUT = 5.0V
1000
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
- 18 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified)
Buck Load Transient
(Iout2:1A-2.4A-1A, Iout1: 1A)
Buck Load Transient
(Iout2: 80mA-1A-80mA, Iout1: 1A)
VBAT = 8.2V
VOUT = 5.0V
ACT2804-020
ACT2804-019
VBAT = 8.2V
VOUT = 5.0V
CH1
CH1
CH2
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 500mA/div
TIME: 1ms/div
Innovative PowerTM
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 1ms/div
- 19 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
ACT2804
Rev 2, Feb-04-2016
PACKAGE OUTLINE
QFN55-40 PACKAGE OUTLINE AND DIMENSIONS
PIN #1 DOT BY
MARKING
Top View
D
SYMBOL
D/2
E/2
MAX
MIN
MAX
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
L
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
Bottom View
DIMENSION IN
INCHES
MIN
A3
E
DIMENSION IN
MILLIMETERS
L
k
0.400 TYP
0.324
0.476
0.200 MIN
0.016 TYP
0.013
0.019
0.008 MIN
b
D1
e
E1
k
A3
A
A1
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
sales@active-semi.com or visit http://www.active-semi.com.
is a registered trademark of Active-Semi.
Innovative PowerTM
- 20 -
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Copyright © 2016 Active-Semi, Inc.