ACT2804_17 [ACTIVE-SEMI]
5V/3.4A Dual Cell Battery Power Manager;
| 型号： | ACT2804_17 |
| 厂家： | 
ACTIVE-SEMI, INC |
| 描述： | 5V/3.4A Dual Cell Battery Power Manager 电池 |
| 文件： | 总23页 (文件大小：558K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACT2804
Rev 3, Apr-17-2017
5V/3.4A Dual Cell Battery Power Manager
Battery Over-charge and Over-discharge
FEATURES
Protections
Dedicated Single-chip Integrated Battery Power
Charge/Discharge Thermal Regulation
TQFN5x5-40 Package
Manager
Dual Cell Battery Charger with Cell Balancing
Management
APPLICATIONS
Auto Detection support USB BC1.2, Chinese
YD/T 1591-2009, Apple 2.4A, and Samsung
Devices
Backup Battery Pack
Power Bank
Dual Cell Boost Battery Charger
Bluetooth Speaker
Standalone Battery Charger with USB Output
Passed Apple MFi Test
4.5V-5.5V Input Voltage with 3.8A Input Current
Limit
2.4A+1.0A Dual Outputs with CC Regulation
GENERAL DESCRIPTION
5.07V+/-1% Output with Prioritized Power Path
ACT2804 is a space-saving and dedicated single-
chip 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.
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
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.
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
Capability to Charge Wearable Devices
Weak Input Sources Accommodation
Safety:
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 .
Input Over-voltage Protection
Nearly Zero Power Short Circuit Protection
Output Over-voltage Protection
ACT2804 is available in a thermally enhanced
5mmx5mm QFN55-40 package with exposed pad.
Buck Output CC/CV
6.0
5.0
VBAT = 6.0V
4.0
3.0
VBAT = 8.2V
1A Output
2.4A Output
2.0
1.0
0
0
500
1000
1500
2000
2500
3000
Output Current (mA)
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Copyright © 2017 Active-Semi, Inc.
ACT2804
Rev 3, Apr-17-2017
ORDERING INFORMATION
PART NUMBER
BATTERY CELL VOLTAGE JUNCTION TEMPERATURE
PACKAGE
QFN55-40
QFN55-40
PINS
40
ACT2804QJ-T
4.20V
4.35V
-40˚C to 150˚C
-40˚C to 150˚C
ACT2804QJ-T0435
40
PIN CONFIGURATION
CSN2
CSN1
CSP
LED3
LED2
LED1
VOUT
VOUT
VIN
PB
AGND
VREG
TH
ACT2804
VIN
OVGATE
OVSENS
SCL
ICST
BATN
CBD
PGND
TOP VIEW
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ACT2804
Rev 3, Apr-17-2017
PIN DESCRIPTIONS
PIN
NAME
CSN2
CSN1
CSP
DESCRIPTION
1
Output current sense negative input for channel 2.
2
Output current sense negative input for channel 1.
Output current sense positive input.
Power Output Pin.
3
4, 5
VOUT
6, 7
VIN
USB or AC Adapter input.
8
9
OVGATE Output to drive optional external NMOS protect IC from over voltage.
OVSENS USB or AC Adapter input sense.
10
11
SCL
SDA
I2C clock input.
I2C data 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.
12
PGND
13
HSB
SW
High side bias pin. Connect a 47nF ceramic capacitor from HSB to SW.
Internal switch connected to a terminal of the output inductor.
14,15
16,17
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.
BAT
Battery charge current sense input. Connect to charge sense resistor positive terminal with
Kevin sense.
18
BATS
19
20
BATP
BATC
Connect to charge sense resistor negative terminal and battery positive terminal.
Battery central point connection. Connect to dual battery cell common terminal.
Cell balancing discharge. Connect to a discharge resistor from this pin to battery common
terminal.
21
22
CBD
BATN
Battery negative terminal.
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.
23
ICST
24
25
TH
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.
VREG
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ACT2804
Rev 3, Apr-17-2017
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
26
AGND
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.
27
PB
28
29
30
31
LED1
LED2
LED3
LED4
Battery level indicator.
Battery level indicator.
Battery level indicator.
Battery level indicator.
32
33
34
35
LEDLS1 LED1 threshold level shift. Connect a resistor from the pin to AGND to shift LED1 threshold.
LEDLS2 LED2 threshold level shift. Connect a resistor from the pin to AGND to shift LED2 threshold.
LEDLS3 LED3 threshold level shift. Connect a resistor from the pin to AGND to shift LED3 threshold.
LEDLS4 LED4 threshold level shift. Connect a resistor from the pin to AGND to shift LED4 threshold.
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.
36
37
38
PT
RIMC
HYST
RIMC Battery impedance compensation input.
The hysteresis window setting input. Connect a resistor at the pin to set the hysteresis windows
for LED1, 2, 3, 4.
39
40
DM
DP
Output port auto detection input. Connected to portable device D-.
Output port auto detection input. Connected to portable device D+.
Exposed pad. Must be soldered to ground plane layer(s) on the PCB for best electrical and
thermal conductivity.
41
PGND
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ACT2804
Rev 3, Apr-17-2017
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE
UNIT
LEDLS1, LEDLS2, LEDLS3, LEDLS4, RIMC, HYST and PT to GND
-0.3 to +6
-0.3 to +6
-0.3 to +6
-0.3 to +16
-0.3 to +12
-0.3 to +6
-0.3 to +0.3
-0.3 to +0.3
-0.3 to +6
-0.3 to +6
-0.3 to +0.3
-6 to +0.3
-6 to +0.3
-0.3 to +12
-0.3 to +6
40
V
LED1, LED2, LED3 and LED4 to GND
PB, DM, DP, TH, SCL, SDA and ICST to GND
OVSENS to GND
V
V
V
V
V
V
V
V
V
V
V
V
V
V
OVGATE to GND
VIN, VOUT and VREG to GND
CSP to CSN2, CSP to CSN1, CSP to VOUT
BAT to BATS, BATS to BATP
BATC to BATN
BAT to BATC
BATN to GND
CBD to BAT
BATN to CBD
SW to PGND
HSB to SW
Junction to Ambient Thermal Resistance (θJA)
℃/W
℃
Operating Junction Temperature (TJ)
Operating Temperature Range (TA)
Store Temperature
-40 to 150
-40 to 85
-55 to 150
300
℃
℃
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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ACT2804
Rev 3, Apr-17-2017
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
5.5
5.5
6.0
V
Input Over Voltage Protection
VIN rising, VIN_OVP
5.7
290
4.2
200
3.8
3.65
200
3
V
mV
V
Input Over Voltage Hysteresis
VIN falling, VIN_OVP_HYST
VIN rising, VIN_UVLO
Input Under Voltage Lock-Out
Input Under Voltage Lock-Out Hysteresis
Input Current Limit Setting Range
Output Under voltage protection (UVP)
VIN falling, VIN_UVLO_HYST
mV
A
-10%
+10%
VOUT falling, VOUT_UVP
V
Output Under Voltage Protection Hysteresis VOUT rising, VOUT_UVP_HYST
Q1 wait time in hiccup mode
mV
s
Boost Mode/Charge Mode
Switching Frequency
-15%
400
2.8
15
+15% KHz
Precondition Voltage Threshold of Each Cell VBAT1,2 rising
V
%
V
Preconditioning current
Boost Charger UVLO
Percentage of fast charge current
VOUT rising, BST_UVLO
4.2
VBAT_EOC (ACT2804QJ-T)
-0.5%
-0.5%
4.2
+0.5%
+0.5%
V
Battery End-Of-Charge Voltage
VBAT_EOC (ACT2804QJ-T0435)
Percentage of fast charge current
4.35
10
V
End of Charge Detection Current
Buck mode/Discharge
%
Buck Under Voltage Lock-Out
VABT falling, VBAT1, 2
REG3[1:0]=00, Default
REG3[1:0]=01
2.9
V
V
V
V
V
A
A
5.07
5.12
5.17
5.22
1.25
2.65
VOUT Output Regulation Voltage
REG3[1:0]=10
REG3[1:0]=11
RCS1=25mΩ, ICC1
RCS2=25mΩ, ICC2
1.05
2.45
1.40
2.85
VOUT1 and VOUT2 Current Limit
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ACT2804
Rev 3, Apr-17-2017
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
VOUT rising, BCK_OVP
3.65
5.7
V
V
Buck Converter Over Voltage Protection
Threshold
Buck Convert Hiccup Time
3.4
10
s
Buck Converter Light-Load Cut-off Current
5
15
mA
Buck Converter Light-Load Cut-off Deglitch
Time
12.5
s
High Side Switch Peak Current Limit
Over Temperature Protection
All condition
OTP
4.5
A
160
20
℃
℃
Over Temperature Protection Hysteresis
OTP_HYST
Battery Protection
Battery Over Charge Current
Battery Over Voltage
2.6
3
A
Percentage of EOC Voltage
101.5 102.5 103.5
1.6
%
Battery Under Voltage and Short Circuit
Protection
V
Preconditioning timer
If timer expires, goes to latch-off
Charge mode
1
hr
uA
uA
V
140
100
2.5
2.5
1
TH Pull-up Current
Discharge mode
Charge mode
TH High Threshold
TH Low Threshold
Discharge mode
Charge mode
V
V
Discharge mode
0.57
V
System Management
VREG Output Current
50
mA
PB Rising Threshold
PB rising, discharge mode
PB falling, discharge mode
Pull up to internal supply
0.5s on and 0.5s off
0.95
0.75
1.2
V
V
PB Falling Threshold
PB internal pull up resistance
Fault Condition Alarm Frequency
Fault Condition Alarm Timer
MΩ
Hz
s
1.0
10
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ACT2804
Rev 3, Apr-17-2017
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
LED Indication
TEST CONDITIONS
MIN TYP MAX UNIT
LED1-4 Indication Level Setting
LED Sink Current
5.5
8.8
V
mA
s
3
LED1-4 Scan Interval
For each LED pattern before lighting LEDs
0.5
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ACT2804
Rev 3, Apr-17-2017
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
SCL, SDA Input Low
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
VCC= 5V
VCC= 5V
SDA=5V
IOL = 5mA
0.4
SCL, SDA Input High
1.25
V
SDA Leakage Current
SDA Output Low
1
µA
V
0.35
1000
SCL Clock Frequency, fSCL
SCL Low Period, tLOW
0
0.5
0.26
50
kHz
µs
µs
ns
ns
ns
ns
pF
ns
ns
SCL High Period, tHIGH
SDA Data Setup Time, tSU
SDA Data Hold Time, tHD
Start Setup Time, tST
See Note: 1
0
For Start Condition
For Stop Condition
260
260
Stop Setup Time, tSP
Capacitance on SCL or SDA Pin
SDA Fall Time SDA, Tof
Rise Time of both SDA and SCL, tr
10
Device requirement
See Note: 3
120
120
Fall Time of both SDA and SCL, tf
See Note: 3
120
50
ns
ns
Pulse Width of spikes must be sup-
pressed on SCL and SDA
0
Notes: 1. Comply to I2C timings for 1MHIZ operation - “Fast Mode Plus”
2. No internal timeout for I2C operations
3. This is a I2C system specification only. Rise and Fall time of SCL & SDA not controlled by the device.
4. Device Address is 7’h5A - Read Address is 8’hB4 and write is 8’hB5
tSCL
SCL
tST
tHD
tSU
tSP
SDA
Start
Stop
condition
condition
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ACT2804
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I2C DESCRIPTION
PROGRAMMABLE PARAMETER LIST
ITEMS
STEP/STATUS
DEFAULT
COMMENT
Input Current Limit and Q1
Input Current Limit
VIN UVLO
0.6A,1.25A, 2.75A, 3.8A
4.2V, 4.5V
3.8A
4.2V
+/-10%
Buck Converter/Discharge Mode
Discharge Cut-Off Voltage
2.7V, 2.8V, 2.9V, 3.0V
1.25A/2.6A or 2.6A/1.25A
5.07V, 5.12V, 5.17V, 5.22V
2.9V
1.25A/2.65A
5.07V
VOUT1 and VOUT2 Current Limit
VOUT Voltage
Switch by I2C
Boost Converter/Charge Mode
4.20V
(ACT2804QJ-T)
4.35V
Battery EOC Voltage
4.35V, 4.20V, 4.15V, 4.1V
(ACT2804QJ-T0435)
Pre-charge voltage threshold
Pre-charge Current
EOC Current
2.8V, 3.0V
10%, 15%, 20%, 25%
6%, 10%, 14%, 18%
60%, 80%, 100%, 120%
2.8V
15%
10%
Fast charge current
100%
System
VCC ON/OFF in HZ Mode
ON, OFF
OFF
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ACT2804
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CUSTOMER REGISTER MAP
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ACT2804
Rev 3, Apr-17-2017
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.
threshold, boost converter charges battery with
constant current. In fast charge state, the ACT2804
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.
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.
Top Off
Device transitions from Fast Charge (CC) to Top
Off (CV), and moves to EOC (End of Charge) state
Modes of Operation
when charging current is less than IEOC
.
ACT2804 has 3 operation modes: charge mode,
discharge mode, and high-impedance (HZ) mode.
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.
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.
Recharge
Discharge Mode
In EOC, device would re-charge batteries when
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.
both battery voltage levels drops 5% below VEOC
.
Battery Removal
If the battery is removed, boost converter regulates
at the programmed regulation voltage.
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.
Cell Balance
Cell Balance is activated in both Fast Charge and
Top Off modes. Each battery is connected with a
parallel bleeding switch.
Precondition Charge
Push Button
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.
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 ACT2804 Charge States
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APPLICATIONS INFORMATION
and RLS4 connected from LEDLS1, LEDLS2,
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.
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.
Figure 3: LED treshod setng
The following equaon hows hw the external
resistor shifts the LED thresoldsThe range of
LED1‐LED4 indicator threshold shift from 5.5V‐
8.8V.
1000
Ic(A)
(1)
5* RCS (m)* RICST (k)
108 k
For example, IC=1A with RCS=25mΩ and
ICST=8kΩ.
VLEDX
5.5V
(3)
(V )
R LSx (k)
VLED Example is given by the below table:
R
Recommended RICST is shown in following table:
RLSx
(kΩ)
VLEDx
(V)
RLSx
(kΩ)
VLEDx
(V)
RICST
IC (A)
Units
RCS=25mꢀ
10
RCS=50mꢀ
5
72
7
40
43.2
47
8.2
8
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
90
6.7
6.5
6.4
6.3
6.1
5.9
8.89
8
4.44
4
108
120
135
180
270
7.798
7.7
7.27
6.67
6.15
5.71
5.33
3.64
3.33
3.08
2.86
2.67
49.1
57
7.395
7.3
60
67.5
7.1
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.
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.
IDISCHARGE RICST
VICST
(2)
20k
For example: VICST=0.4V with I_DISCHARGE=1A,
and RICST=8kΩ.
LED Threshold Setting
ACT2804 provide HYST pin to set hysteresis
window for each indication level as shows in Figure
3 .
LED1, LED2, LED3 and LED4 thresholds are
adjustable with external resistors RLS1, RLS2, RLS3
,
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ACT2804
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APPLICATIONS INFORMATION
HYST pin is regulated at 1V. Its input current will
determine hysteresis adjustment equally to all level.
Connect HYST to AGND via a resistor to set
hysteresis window.
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.
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:
54K
HYST (V )
4
RHYST
K
VHYST 4:3 0.5*HYST VHYST 2:1 0.6*HYST
5
Then RHYST Example is given by the below table:
LED1
VHYST
LED2
VHYST
LED3
VHYST
LED4
VHYST
RHYST (kꢀ)
Floating
270
135
90
0mV
0mV
0mV
0mV
120mV
240mV
360mV
480mV
600mV
720mV
120mV
240mV
360mV
480mV
600mV
720mV
100mV
200mV
300mV
400mV
500mV
600mV
100mV
200mV
300mV
400mV
500mV
600mV
Figure 4: Thermistor setting
67.5
54
VTCL ICHG Rchot
V TCH ICHG Rcold
(7)
(8)
45
Battery Impedance Compensation
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.
RaRNTCh
Ra RNTCh
Rchot Rb
Rcold Rb
(9)
RaRNTCc
Ra RNTCc
(10)
RNTCc : NTC Resistor at cold temperature (Tcold)
NTCh : NTC Resistor at hot temperature (Thot)
R
RCS (m)
RBAT (m)
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.
RIMC (k) 2160k
(6)
In case not using compensation, float RIMC then
there is no compensation affects to trig-points.
For example, use NXRT15XH103 NTC resistor, the
temperature in charge mode is 0℃ to 45℃,we
RIMC example is given by the below table:
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
RBAT (mꢀ)
RCS = 25 mꢀ
RCS = 50 mꢀ
100
200 300 400 500 600 700
540k 270k 180k 135k 108k 90k 77k
1080k 540k 360k 270k 216k 180k 154k
temperature is -20℃to 60℃.
Battery Temperature Monitering
Cell Balance Setting
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
ACT2804 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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ACT2804
Rev 3, Apr-17-2017
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.
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
#
Conventional
1a
4kꢀ
Always On In Discharge
Conventional
1b
2
12kꢀ
24kꢀ
40kꢀ
56kꢀ
5s Indication in Discharge
Breathing
5s Indication in Discharge
Bottom Charging
3
5s Indication in Discharge
Circulating
4
5s Indication in Discharge
Below shows 4 LED indication patterns.
Figure 5: Cell balance
LED Indication
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 shown in
Figure 6 .
Figure 6: LED Indication
LED1-4 Refreshing ycle
I n
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
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.
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
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ACT2804
Rev 3, Apr-17-2017
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 CSN1, CSN2 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.
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Copyright © 2017 Active-Semi, Inc.
ACT2804
Rev 3, Apr-17-2017
APPLICATIONS SCHEMATIC
Figure 7. ACT2804 typical application circuit
(Input current limit 3.8A, 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.
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ACT2804
Rev 3, Apr-17-2017
Table 5: BOM List
ITEM
REFERENCE
DESCRIPTION
QTY MANUFACTURER
1
2
C1
Ceramic capacitor, 4.7uF/10V, X7R, 0805
Ceramic capacitor, 22uF/10V, X7R, 1206
1
4
Murata/TDK
Murata/TDK
C2,C3,C4,C5
3
C8,C10,C11
Ceramic capacitor, 22uF/16V, X7R, 1206
3
Murata/TDK
4
C6,C9
C7
Ceramic capacitor, 0.1uF/16V, X7R, 0603
Ceramic capacitor, 47nF/10V, X7R, 0603
Ceramic capacitor, 2.2nF/16V, X7R, 0603
Ceramic capacitor, 1uF/10V, X7R, 0603
Ceramic capacitor, 100nF/16V, X7R, 0603
Ceramic capacitor, 2.2uF/10V, X7R, 0603
Ceramic capacitor, 3.3uF/10V, X7R, 0603
MBR1020VL, 20V, 1A Schottky, optional
Core SWPA8040S4R7NT 4.7uH 5.9A
2
1
1
1
1
1
2
1
1
4
1
3
1
1
1
1
1
1
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Panjit
5
6
C12
7
C13
8
C14
9
C15
10
11
12
13
14
15
16
17
18
19
20
21
C16,C17
D1
L1
Sunlord
LED1,LED2, LED3,LED4 LED, 0603, Blue
LED Manu
Murata/TDK
SART
R1
R2,R3,R4
R5
Chip Resistor, 2.7Ω, 1/8W, 1%, 0805
Chip Resistor, 25mΩ, 1/2W, 1%, 1206
Chip Resistor, 8kΩ, 1/10W, 1%, 0603
Chip Resistor, 83kΩ, 1/10W, 1%, 0603
Chip Resistor, 63.5kΩ, 1/10W, 1%, 0603
Chip Resistor, 51.4kΩ, 1/10W, 1%, 0603
Chip Resistor, 41.5kΩ, 1/10W, 1%, 0603
Chip Resistor, 12kΩ, 1/10W, 5%, 0603
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
R6
R7
R8
R9
R10
22
23
24
25
R11,R12
R13
Chip Resistor, 540kΩ, 1/10W, 1%, 0603
Chip Resistor, 0.47Ω, 1/8W, 5%, 0805
Chip Resistor, 510Ω, 1/10W, 1%, 0603
Chip Resistor, 47Ω, 1/2W, 5%, 1206
2
1
2
1
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
R14,R16
R15
26
27
28
29
30
31
32
33
34
35
36
R17
R18
Chip Resistor, 3kΩ, 1/10W, 1%, 0603
Chip Resistor, 32kΩ, 1/10W, 1%, 0603
Chip Resistor, 10Ω, 1/10W, 1%, 0603
Chip Resistor, 200Ω, 1/10W, 5%, 0603, optional
Chip Resistor, 100Ω, 1/10W, 5%, 0603
Chip Resistor, 715kΩ, 1/10W, 5%, 0603
103AT NTC Thermistor, NXRT15XH103V
Push Button Switch
1
1
1
1
1
2
1
1
2
1
1
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Nikkai Omron
R19
R20
R21
R22, R23
RNTC
PB
USB
10.2*14.6*7mm, 4P
Micro-USB
U1
MICRO USB 5P/F SMTB
IC, ACT2804, QFN 55-40
Active-Semi
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Copyright © 2017 Active-Semi, Inc.
ACT2804
Rev 3, Apr-17-2017
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified)
Charge Current vs. Output Current
Battery Charge V/I Profile
4000
1200
1000
800
VIN = 5.0V
VIN = 5.0V
CHRG = 1.0A
I
3500
3000
Input Current
2500
2000
600
Output Current
1500
400
Charge Current
1000
200
0
500
0
0
4
8
12
16
20
24
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
Test Point
Vbat (V)
Charge Efficiency
Discharge Efficiency
96.0
95.0
94.0
93.0
92.0
100.0
95.0
90.0
85.0
80.0
75.0
VIN = 5.0V
ICHRG = 1A
VBAT = 6.0V
VBAT = 7.5V
VBAT = 8.4V
91.0
90.0
0
500 1000 1500 2000 2500 3000 3500 4000
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Output Current (mA)
Vbat (V)
Battery Leakage vs. Junction Temperature
(HZ Mode)
Battery Charge Current vs. Junction
Temperature
25.0
20.0
15.0
10.0
1400
VIN = 5.0V
VBAT = 7.5V
1200
1000
800
VBAT = 7.0V
600
VBAT = 8.2V
400
5.0
0
200
0
-20
0
20
40
60
80
100
120
140
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
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ACT2804
Rev 3, Apr-17-2017
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified)
Buck Output1 Constant Current Limit
vs. Temperature
Buck Output2 Constant Current Limit
vs. Temperature
2750
2700
2650
2600
2550
1300
VBAT = 8.4V
CV= 4.0V
Rcs=25mΩ(1%)
VBAT = 8.4V
CV= 4.0V
Rcs=25mΩ(1%)
1250
1200
1150
1100
2500
2450
1050
1000
-30
0
30
60
90
120
150
-30
0
30
60
90
120
150
Temperature (°C)
Temperature (°C)
Buck Output1 Voltage vs. Output Current
Buck Output2 Voltage vs. Output Current
5.25
5.20
5.15
5.10
5.05
5.00
4.95
5.25
5.20
5.15
5.10
5.05
5.00
4.95
VBAT =8.4V
VBAT =8.4V
VBAT=6.0V
VBAT=6.0V
0
200
400
600
800
1000
1200
1400
0
500
1000
1500
2000
2500
3000
Buck Output1 Current (mA)
Buck Output2 Current (mA)
Buck Output1 Constant Current Limit vs. VBAT
Buck Output2 Constant Current Limit vs. VBAT
1240
1230
1210
1200
2720
2700
2680
2660
2640
1190
1180
2620
2600
5.8
6.2
6.6
7.0
7.4
7.8
8.2
8.6
5.8
6.2
6.6
7.0
7.4
7.8
8.2
8.6
Vbat (V)
Vbat (V)
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ACT2804
Rev 3, Apr-17-2017
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified)
Battery Leakage vs. Battery Voltage
(HZ Mode)
Buck Standby Current vs. Battery Voltage
7.0
6.0
5.0
4.0
3.0
2.0
1.2
1.1
1.0
0.9
0.8
0.7
0.6
1.0
0
5.8
6.2
6.6
7.0
7.4
7.8
8.2
8.6
0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
Battery Voltage (V)
Battery Voltage(V)
Buck Output1 CC/CV
Buck Output2 CC/CV
6.0
6.0
5.0
4.0
3.0
2.0
5.0
4.0
3.0
2.0
VBAT = 6.0V
VBAT = 6.0V
VBAT = 8.2V
VBAT = 8.2V
1.0
0
1.0
0
0
200
400
600
800
1000
1200
0
500
1000
1500
2000
2500
3000
Output1 Current (mA)
Output2 Current (mA)
Buck Load Transient
(Iout2:1A-2.4A-1A, Iout1: 0A)
Buck Load Transient
(Iout2: 80mA-1A-80mA, Iout1: 0A)
VBAT = 8.2V
OUT = 5.0V
VBAT = 8.2V
VOUT = 5.0V
V
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
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Copyright © 2017 Active-Semi, Inc.
ACT2804
Rev 3, Apr-17-2017
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 7, 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
VBAT = 8.2V
VOUT = 5.0V
CH1
CH2
CH1
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 500mA/div
TIME: 1ms/div
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 1ms/div
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Copyright © 2017 Active-Semi, Inc.
ACT2804
Rev 3, Apr-17-2017
PACKAGE OUTLINE
QFN55-40 PACKAGE OUTLINE AND DIMENSIONS
DIMENSION IN
MILLIMETERS
DIMENSION IN
INCHES
SYMBOL
MIN
0.700
0.000
MAX
0.800
0.050
MIN
0.028
0.000
MAX
0.031
0.002
A
A1
A3
b
0.203 REF
0.008 REF
0.150
4.924
4.924
3.300
3.300
0.250
5.076
5.076
3.500
3.500
0.006
0.194
0.194
0.130
0.130
0.010
0.200
0.200
0.138
0.138
D
E
D1
E1
e
0.400 TYP
0.016 TYP
L
0.324
0.476
0.013
0.019
k
0.200 MIN
0.008 MIN
Active-Semi, Inc. reserves the right to modify the ircuitry 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.
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