ACT2802QL-T [ACTIVE-SEMI]
5V/2.5A Backup Battery Pack Manager;
| 型号： | ACT2802QL-T |
| 厂家： | 
ACTIVE-SEMI, INC |
| 描述： | 5V/2.5A Backup Battery Pack Manager 电池 |
| 文件： | 总21页 (文件大小：586K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACT2802
Rev 0, 21-Jan-14
5V/2.5A Backup Battery Pack Manager
FEATURES
Dedicated Single Chip Solution for Mobile
APPLICATIONS
Backup Battery Pack
Power Bank
Power With Minimal Component Count
5V/2.5A Constant Output Current Limit in
Boost Mode
2.5A Switching Charger Current Limit
Programmable 4.1V to 4.35V Battery Voltage
95% Boost Efficiency (Vbat=4.1V)
Adaptive to 10mA-2400mA Input Sources
Battery Disconnection at Output Short
Mobile Power
Standalone Battery Charger with USB Output
GENERAL DESCRIPTION
ACT2802 is a space-saving and high-performance
low-profile single-chip solution for backup battery
pack and standalone battery charger. ACT2802
integrates all the functions that a backup battery
pack needs, including switching charger, boost
converter and LED indication.
<10µA Low Battery Leakage Current at HZ
Mode During Storage
Boost Auto Turn-off at No Load and Push
Button Turn-on
Battery Over Current, Over Voltage, Over
ACT2802 operates at 1.1MHz for switching charger
and 0.55MHz for boost converter allowing tiny
external inductor and capacitors. ACT2802 provides
a direct power path from input to output with
programmable current limit while providing power
to switching charger. Output has higher priority than
battery charger if the programmed input current limit
is reached.
Temperature and Short Circuit Protections
Boost Auto Startup with Load Detection
Up to 3.0A Input Current Limit with Prioritized
Power Path to Output
5V+/-100mV Output Voltage in Boost Mode
1.1MHz/0.55MHz Switching Frequencies
2.2uH Inductor and Low Profile Ceramic
ACT2802 charges battery with full cycle of
preconditioning, fast charge with constant current
and constant voltage until end of charge. The
battery charger is thermally regulated at 110°C with
charge current foldback.
Capacitors
4 LEDs Battery Level and Status Indication
Battery Impedance Compensation
Full Cycle of Battery Charge Management
Preconditioning, Fast Charge, Top off and End
of Charge
ACT2802 boost converter steps battery voltage up
to 5V. Boost converter features high efficiency,
constant current regulation, short circuit protection
and over voltage protection.
Charge Current Foldback at 110°C Die
Temperature
IC Over Temperature Protection at 160°C
QFN4x4-24 Package
ACT2802 provides 3.5mA constant currents to drive
4 LEDs to indicate battery level and charge status.
Boost CC/CV Profile
5.5
VBAT =3.2V
5.0
VBAT =3.7V
4.5
4.0
VBAT =4.1V
3.5
3.0
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
Output Current (A)
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ACT2802
Rev 0, 21-Jan-14
ORDERING INFORMATION
BOOST SWITCH
PART NUMBER
CHARGE
CURRENT
OUTPUT
PACKAGE
PACKING
FREQUENCY
TAPE & REEL,
3KU/REEL
ACT2802QL-T
0.55MHz
5V/2.5A
2.5A
QFN44-24
PIN CONFIGURATION
TOP VIEW
2
2
21 20 19
1
2
3
4
5
6
18
17
16
15
14
13
HZ
PB
LED1
BTV
ICST
IOST
CSN
CSP
AGND
nPG
ILIM
VIN
EP
7
8
9
10 11 12
QFN44-24
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ACT2802
Rev 0, 21-Jan-14
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
Boost/high-Z mode enable pin, internally pulled up by a 3MΩ resistor to battery. When
HZ pin is pulled ground, boost is enabled if VIN is not present.
1
HZ
Push button input, connect a push button from this pin to AGND, internally pulled up
by a 3MΩ resistor to battery. When this pin is pushed for 100ms, LED1-4 indicators
are enable for 5 seconds. PB starts up boost converter if HZ pin is grounded and VIN
is not present.
2
PB
3
4
AGND
nPG
Logic Ground.
Drive external P-FET to protect output short circuit and leakage during shutdown. nPG
pin is pulled up to VOUT internally. nPG pin is pulled low if VOUT is in the range.
Input current limit setting pin. Connect a resistor from this pin to AGND to set the input
current limit. The current setting ranges from 1.0A-3.0A.
5
6
ILIM
VIN
USB or AC adaptor input. When VIN is valid, charge and power path is enabled.
Output pin. Bypass to PGND with a high quality low ESR and ESL ceramic capacitor
placed as close to the IC as possible.
7, 8
9, 10
11
VOUT
SW
Internal switch to output inductor terminal.
Power ground. PGND is connected to the source of low-side N-channel MOSFET and
the MOSFET’s gate driver.
PGND
Battery input. Connected to the battery pack positive terminal to provide power in High
-Z mode. Bypass to PGND with a high quality ceramic capacitor placed as close to the
IC as possible.
12
BAT
Positive terminal of charge current sense input. Kevin sense is required with 10nF
ceramic capacitor right across CSP and CSN pins.
13
14
15
CSP
CSN
IOST
Negative terminal of charge current sense input.
Output current setting. Connect a resistor from this pin to AGND to set output constant
current. The current setting ranges from 1.0A-2.5A.
Fast charge current setting pin. Connect a resistor from this pin to AGND to set the
charge current. The current setting ranges from 1.0A-2.5A.
16
17
ICST
BTV
Battery termination voltage setting. Connect a resistor from this pin to AGND to
program battery charge termination voltage.
18
19
20
LED1
LED2
LED3
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
21
22
LED4
RIMC
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery impendence compensation input. Connect to a resistor from this pin to APNG
to program the battery impedance.
Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery
LED indication thresholds.
23
BLVS
Temperature sensing input. Connect to battery thermistor terminal. If no use, put 10K
pulled down resistor.
24
25
TH
EP
Exposed pad. Must be soldered to ground on the PCB.
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ACT2802
Rev 0, 21-Jan-14
ABSOLUTE MAXIMUM RATINGS
PARAMETER
All the Pin to PGND and AGND
VALUE
-0.3 to 6.5
40
UNIT
V
Junction to Ambient Thermal Resistance
Maximum Power Dissipation
°C/W
W
2.5
Operating Ambient Temperature
Operating Junction Temperature
Storage Junction Temperature
-40 to 85
-40 to 150
-40 to 150
300
°C
°C
°C
Lead Temperature (Soldering 10 sec.)
°C
: 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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ACT2802
Rev 0, 21-Jan-14
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
Input Current Limit
TEST CONDITIONS
MIN
TYP
MAX UNIT
Input Voltage Range
4.5
5.5
5.5
6.5
V
V
VIN Over Voltage Protection
Input Voltage Validation Time
VIN rising, VIN_OVP
6.0
32
VIN_UVLO<VIN<VIN_OVP
ms
A
Input Current Limit Setting Range
Input Current Limit
RILIM=0.806kΩ—2.4kΩ
1.0
3.0
RILIM=0.806kΩ
3.0
A
Input Current Limit Gain
2000
Leakage Current from VOUT to VIN in Boost
Mode
0
10
15
µA
µA
3.0V<VBAT<4.35V, Ta=25℃
3.0V<VBAT<4.35V, Ta=25℃
Battery Discharge Current in High-Z Mode
7.5
Power Switches
VIN-to-VOUT FET on Resistance
VOUT-to-SW FET on Resistance
SW-to-PGND FET on Resistance
Buck Converter
80
60
65
mΩ
mΩ
mΩ
ACT2802QL-T
-15%
4.5
1.1
6
+15% MHz
Switching Frequency
High Side Switch Peak Current Limit
Minimum On-time
A
100
160
ns
Over Temperature Protection (OTP)
OTP rising
OTP falling
℃
℃
OTP Hysteresis
35
Charge Mode
Charge Current Setting Range
Rcs=25mΩ, RICST=20kΩ—50kΩ
Rcs=25mΩ, RICST=43.2kΩ
1.0
2.5
A
A
Charge Current Setting (ICHRG
)
2.1
110
0.1
Thermal Regulation Temperature
℃
V
Rbtv=25kΩ
Battery Adjust Voltage(VBAJ
)
End of Charge (EOC) Voltage
EOC Voltage Accuracy
-0.5% 4.1+VBAJ 0.5%
4.1
V
Rbtv=0
V
Battery Over Voltage Threshold
Battery Over Voltage Threshold Hysteresis
Fast Charge Current
VBAT rising
VBAT falling
VBAT=3.5V
4.6
200
V
mV
A
ICHRG
Precondition Charge Current
2.4V≤VBAT≤2.8V, Percent of ICHRG
10
%
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ACT2802
Rev 0, 21-Jan-14
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
Precondition Voltage Threshold
Precondition Voltage Threshold Hysteresis
Low VBAT Charge Current
VBAT rising, Rbtv=0
2.8
130
200
V
mV
mA
VBAT=1V, RICST=43.2kΩ
VBAT=4.2V, percent of the fast
charge current
EOC Current Threshold
13
%
Charge Restart Voltage Threshold
TH Upper Temperature Voltage Threshold
TH Lower Temperature Voltage Threshold
TH Hysteresis
200
1.5
0.3
50
mV
V
Cold detect NTC thermistor
Hot detect NTC thermistor
1.45
0.28
1.55
0.32
V
mV
µA
TH Internal Pull-up Current
60
Charge Current Foldback
Charge Current Reduction Threshold1 of Vout1 Starting foldback point
4.63
4.7
4.77
4.5
V
V
Stop foldback point, RCS=25mΩ,
ICST=43.2kΩ
Charge Current Reduction Threshold2 of Vout1
4.57
R
Boost Mode
Input Voltage Operation Range
Switching Frequency
3.0
V
ACT2802QL-T
VBAT rising
VBAT falling
Ta=25℃
-15%
0.55
3.3
+15% MHz
Input Voltage UVLO
V
Input Voltage UVLO Hysteresis
Output Voltage
400
mV
4.97
-3
5.05
VOUT
5.10
2
V
%
V
Output Voltage Accuracy
All conditions
80mA-1A-80mA, 0.1A/us
1A-2.0A-1A, 0.1A/us
VOUT rising
4.75
4.7
5.25
5.25
Output Voltage Transient Response
V
V
Output Over Voltage Protection
Output Over Voltage Protection Hysteresis
Output Current Regulation Range
Output Current Limit
5.7
VOUT falling
300
mV
A
1.0
4.9
2.5
Rcs=25mΩ, RIOST=37.4kΩ—93.7kΩ
Rcs=25mΩ, RIOST=91kΩ
2.4
100
6.9
A
Minimum On-Time
ns
A
Low Side Switch Peak Current Limit
Soft-Startup Time
VBAT=3.6V, VOUT=5V
400
µs
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ACT2802
Rev 0, 21-Jan-14
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
Under Voltage Protection (UVP Threshold)
Under Voltage Protection (UVP Threshold)
UVP Blanking Time During Startup
UVP Sense Detection Time
VOUT falling
VOUT rising
4.25
4.6
3
V
V
ms
µs
VOUT falling
Hiccup mode
20
Restart After UVP
2
s
Light Load Current Shut off Threshold
Light Load Current Detect Time
HZ Pin High Voltage
40
90
mA
s
HZ voltage rising
HZ voltage falling
0.9
0.75
3
1.4
V
HZ Pin Low Voltage
0.4
V
HZ Internal Pull-up Resistor
PB Turn off Boost Time
PB Turn on Boost Time
Mode Transition
MΩ
s
3
100
ms
Transition Waiting Time between Charge
Mode and Boost Mode
TRANTIME
2
s
Battery Level Indication
Battery Impedance Compensation Range
Battery Impedance Compensation
40
500
1.4
mΩ
mΩ
ms
V
200
100
0.9
0.75
3
Rcs=25mΩ, RIMC=200kΩ
PB Deglitch Time
PB High Input Voltage
PB Low Input Voltage
PB Internal Pull-up Resistor
PB voltage rising
PB voltage falling
0.4
V
MΩ
LED Indication Time
LED Flash Frequency
PB is pushed and released
5
s
Charging, LED flash 1s on and 1s off
0.5
Hz
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ACT2802
Rev 0, 21-Jan-14
FUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL DESCRIPTION
ACT2802 is a complete battery charging and
discharging power management solution for
applications of single-cell lithium-based backup
battery pack or power bank. There is a power path
from input to output with programmable input
current limit. When output is over loaded, the input
switch Q1 starts going into linear mode and thus
output voltage starts to drop. If output voltage drops
below 4.25V, the input switch Q1 turns off and
restart in 2 seconds.
at VOUT, and the current limit switch Q1 is turned
off, and the reverse current from VOUT to VIN is
blocked. In HZ mode, all the switches are turned off
and the drainage current from battery is very low.
The system operation flow chart as shown in Figure
1.
Any transitions between boost mode and charge
mode go through HZ mode by turning off all the
switches Q1-Q3 into HZ mode for 2 seconds before
enabling the other mode.
With the advanced ACT2802 architecture,
a
The modes are determined by HZ pin and VIN pin
as shown in the table 1. A valid VIN voltage forces
ACT2802 into charge mode. Boost mode is enabled
if HZ pin is pulled low and VIN is invalid or not
present. When HZ=0, if PB is pulled low for more
than 100ms, boost converter is enabled. A running
boost is disabled if one of the following conditions is
met:
synchronous buck/boost converter is connected
from VOUT to switching node (SW). With the
bidirectional architecture, the converter could be
configured as either buck to charge battery or boost
to discharge battery. With switching charger and
discharger, the higher charge current and higher
conversion efficiency are achieved.
Modes of Operation
1. After PB is released, if PB is pulled low for more
than 3 seconds.
ACT2802 has 3 operation modes: charge mode,
boost mode and high-impedance (HZ) mode. In
charge mode, the input current limit is enabled and
the Q2 and Q3 operate as a buck converter to
charge battery. In boost mode, Q2 and Q3 operate
as boost converter to step battery voltage up to +5V
2. Boost converter output current is below light
load threshold for 1.5 minutes.
3. Battery voltage falls below the boost cut-off
threshold.
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ACT2802
Rev 0, 21-Jan-14
FUNCTIONAL DESCRIPTION
Figure 1:
ACT2802 System Operation Flow Chart
to decrease as necessary to maintain charging at
Table 1: Mode Selection
the termination voltage.
HZ PIN
VIN Valid
Mode
0
0
0
1
1
0
1
1
Precondition Charge
Boost
Charge
HZ
Charge
A new charging cycle begins with the precondition
state, and operation continues in this state until VBAT
exceeds the precondition threshold voltage. When
operating in precondition state, the cell is charged
at a reduced current, 10% of the programmed
maximum fast charge constant current. Once VBAT
reaches the precondition threshold voltage the state
machine jumps to the fast charge state.
Input Current Limit
When the input current reaches the programmed
value, switch Q1 goes into linear mode and output
voltage starts to drop. When output voltage drops to
4.25V, hiccup mode is triggered and switch Q1
turns off and restart in 2 seconds.
Fast Charge
Switching Battery Charger
If battery voltage is above preconditioning
threshold, buck converter charges battery with
constant current. In fast charge state, the ACT2802
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 ACT2802 charges in top off state.
ACT2802 is configured in charge mode (buck
mode) when VIN is valid. In this mode, a battery is
charged with preconditioning, fast charge, top-off
and end of charge (EOC). The typical charge
management is shown in Figure 2 and Figure 3.
CC/CV Regulation Loop
There are CC/CV regulation loops built in ACT2802,
which regulates either current or voltage as
necessary to ensure fast and safe charging of the
battery. In a normal charge cycle, this loop
regulates the current to the value set by the
external resistor at the ICST pin. Charging
continues at this current until the battery cell voltage
reaches the termination voltage. At this point the
CV loop takes over, and charge current is allowed
Top Off
With the battery voltage approaches the EOC
voltage set by the BTV pin. Charge current
decreases as charging continues. In the top off
state, the cell is charged in constant voltage (CV)
mode. During a normal charging cycle charging
proceeds until the charge current decreases below
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ACT2802
Rev 0, 21-Jan-14
FUNCTIONAL DESCRIPTION
the end of charge (EOC) threshold, defined as 13%
of fast charge current. When this happens, the state
machine terminates the charge cycle and jumps to
the EOC state.
charge mode and keep monitoring the battery
voltage.
Recharge
When battery voltage drops by 200mV below the
end of charge voltage, the charger is reinitiated
with constant current charge.
End of Charge
When charges current decreases to 13% of set fast
charge current, the buck converter goes into end of
Figure 2.
Typical Li+ Charge Profile and ACT2802 Charge States
A: PRECONDITION STATE
B: FAST-CHARGE STATE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
Figure 3.
Charger State Diagram
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ACT2802
Rev 0, 21-Jan-14
programmed by a resistor connected from BLVS
pin to AGND as shown in Figure 5. The following
equation shows the LED4 voltage threshold:
APPLICATIONS INFORMATION
Battery Charge Termination Voltage
VBATLED4 (V) 3.5(V) 0.01(mA) RBLVS (k)
(2)
Battery charge termination voltage is set by a
resistor Rbtv connected from BTV pin to AGND as
shown in Figure 4. The battery charge termination
voltage is estimated as the following equation:
VBAT (V ) 4.1(V ) Rbtv 4106 (V )
(1)
Rbtv is selected based on the battery voltage rating.
1% accuracy resistor is recommended for Rbtv.
Figure 5. Battery level voltage shift setting circuit
As long as LED4 is set, all the other 3 LED
thresholds is fixed as shown in the table 3:
Table 3: 4 LED Voltage Thresholds
RBLVS (ohm)
LED1
50K
60K
70K
80K
3.35V
3.60V
3.75V
4.00V
3.45V
3.70V
3.85V
4.10V
3.55V
3.80V
3.95V
4.20V
3.65V
3.90V
4.05V
4.30V
Figure 4. Battery terminal voltage setting circuit
LED2
LED Status Indication
LED3
LED4
4 LEDs ON/OFF and flash show the charge status
and the remained capacity level as shown in the
table 2. The LED status is based on battery voltage
and operation modes. In charge mode, when a
battery is fully charged, flashing stops and all the 4
LEDs are solid on.
Input Current Limit
An external resistor is used to set the input current
limit connected from ILIM pin to AGND as shown in
Figure 6. Input current limit has built-in soft startup
and current foldback control loop. The input current
limit is estimated as the following equation:
Battery level voltage shift (BLVS pin)
LED1-4 voltage thresholds are adjusted from HZ
mode during charging and discharging based on
the compensated impedance. Those thresholds are
2.4 (V)
IILIM (A)
(3)
RILIM (k )
Table2: LED Indication
Charge Mode
PB time>100ms (Boost or HZ Mode)
LED1
LED2
LED3
LED4
LED1
LED2
LED3
LED4
VBAT<LED1
LED1≤VBAT<LED2
LED2≤VBAT<LED3
LED3≤VBAT<LED4
VBAT≥LED4
Flash
On
Off
Flash
On
Off
Off
Off
Off
Off
On
On
On
On
Off
Off
On
On
On
Off
Off
Off
On
On
Off
Off
Off
Off
On
On
Flash
On
Off
On
On
Flash
Flash
On
On
On
VBAT≥LED4
(End of Charge)
On
On
On
On
On
On
On
On
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ACT2802
Rev 0, 21-Jan-14
from IOST pin to AGND as shown in Figure 10. The
boost output current is estimated as the following
equation:
2
RIOST (k )
Rcs (m )
IIOST (A) ( A)
(5)
3
Figure 6. Input current limit setting circuit
Input current limit at various resistor curve is shown
in Figure 7.
3.5
3.0
2.5
2.0
Figure 10. Boost output current setting circuit
Figure 11 gives out boost output current with
various RIOST
.
1.5
1.0
0.5
3.0
2.5
0.6
1.0
1.4
1.8
2.2
2.6
3.0
2.0
1.5
1.0
0.5
RILIM (kΩ)
Figure 7. Input current limit setting
Battery Fast Charge Current
Battery fast charge current is set by a resistor
connected from ICST pin to AGND as shown in
Figure 8. Figure 9 gives out different fast charge
current with various RICST. The battery fast charge
current is estimated as the following equation:
0
0
20
40
60
80
100
RIOST (kΩ)
Figure 11. Boost output current setting
Battery Impedance Compensation
RICST (k)
Rcs (m)
Ic(A) 1.25(A)
(4)
An external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 12. RIMC
is corresponding to battery impedance. Higher RIMC
gives higher compensation voltage which is
positively proportional to battery charge/discharge
current.
Select RIMC based on battery impedance:
25 R (m )
Rcs (m )
(6)
(7)
R
IMC (k )
Figure 8. Battery fast charge current setting circuit
VBAT (V) BAT(V) IBAT (A)R(m)10-3
3.0
2.5
2.0
1.5
1.0
0.5
0
0
10
20
30
40
50
60
RICST (kΩ)
Figure 12. Battery impedance compensation setting circuit
Figure 9. Battery fast charge current setting
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
Boost Output Constant Current
Boost output current is set by a resistor connected
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ACT2802
Rev 0, 21-Jan-14
Table 4: Battery Impedance
Flashlight Circuit
RIMC(KΩ)
50
50
100
100
200
200
200
400
Figure 16 shows a circuit with flashlight driver and
control.
Battery
Impedance
R(mΩ)
Rcs=25mΩ
Rcs=50mΩ
100
Boost Output Plug-in Auto Detection
Figure 13 provides a solution for auto plug-in
detection.
Figure 16. Flashlight circuit
LEDs on in Boost Mode
LEDs can be always on during boost mode, the
schematic is shown in Figure17.
Figure 13. Boost output auto detection circuit
Input Over Voltage Surge
In the case of pure ceramic input capacitor is
chosen, if the input cable is long, stray inductance
may cause over voltage spikes as twice as the
steady-state voltage when input source is plugged
in. Below input circuit is recommended to avoid
input voltage surge. R1 resistor is added in series
with capacitor C1 to damp the potential LC
resonance as shown in Figure 14.
Figure 17. LEDs on in boost mode circu
Inductor and Capacitor Selection
ACT2802 supports SMD components. 2.2uH
inductor is recommended. Input side, 4.7uF ceramic
capacitor in series with 2.7Ω resistor are
recommended, on battery side, 22uF ceramic
capacitors is recommended while on output side,
22uFx2 ceramic capacitors are recommended.
Battery Temperature Monitoring
Figure 14. Input over voltage surge protection circuit
The ACT2802 continuously monitors the
temperature of the battery pack by sensing the
resistance of its thermistor, and suspends charging
if the temperature of the battery pack exceeds the
safety limits.
External Input Over Voltage Protection
Considering the maximum voltage rating at VIN pin,
the external OVP circuit as shown in Figure 15 is
recommended if input voltage may go higher than
7V. With the enhanced OVP circuit, input voltage
can be up to 18V.
In a typical application, the TH pin is connected to
the battery pack's thermistor input as shown in
Figure 18. The ACT2802 injects a 60µA current out of
the TH pin into the thermistor, so that the thermistor
resistance is monitored by comparing the voltage at
TH to the internal VTHL and VTHH thresholds of 0.3V
and 1.5V, respectively. When VTH > VTHH or VTH < VTHL
charging and the charge timers are suspended. When
VTH returns to the normal range, charging and the
charge timers resume.
The net resistance from TH to GND required to cross
Figure 15. Input over voltage protection
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ACT2802
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the threshold is given by:
60µA×RNOM×kHOT=0.3V→ RNOM×kHOT=5kꢀ
60µA×RNOM×kCOLD=1.5V → RNOM×kCOLD= 25kꢀ
where RNOM is the nominal thermistor resistance at
room temperature, and kHOT and kCOLD are the ratios
of the thermistor's resistance at the desired hot and
cold thresholds, respectively.
Figure 18. Battery thermal circuit
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ACT2802
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PC 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 size, VIN pin, Vout pin, SW pin and the
schottky diode.
close to VOUT and PGND as possible, SW
goes under the C2 (recommend C2 to use 1206
size). SW pad is a noisy node switching. It
should be isolated away from the rest of circuit
for good EMI and low noise operation.
6. Thermal pad is connected to GND layer through
vias (recommend 4X4 pins and the aperture is
10mil). Ground plane, PGND and AGND is
single point connected under the ACT2802
thermal pad through vias to limited SW area.
2. Place input decoupling ceramic capacitor C3
and R10 as close to VIN pin as possible.
Resistor R10 is added in series with capacitor
C3 to damp the potential LC resonance .
7. From BAT pin to the Battery positive terminal,
need to lay the divided line to ensure the
battery voltage accuracy of sampling.
3. Use copper plane for power GND for best heat
dissipation and noise immunity.
4. Place CSP and CSN capacitor C6 (10nF) close
to CSP and CSN pin as possible, use Kevin
Sense from sense resistor R2 and R2A to CSP
and CSN pins. 22uF decoupling capacitor is
added close to BAT pin.
8. RC snubber is recommended to add across SW
to PGND to reduce EMI noise. 1A /20V schottky
is added to across VOUT and SW pins.
A demo board PCB layout example is shown in the
figure 19.
5. Place the ceramic capacitor C2 and D1 as
Figure 19.
PCB Layout
Bottom Layer
Top Layer
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ACT2802
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Figure 20 Typical application circuit
(Input current limit 3.0A, fast charge current limit 2.1A, boost output constant current limit 2.4A)
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ACT2802
Rev 0, 21-Jan-14
BOM List
ITEM REFERENCE
DESCRIPTION
Core 6.5*3*3 Dip 2.2uH 6A
AO4503, Rdson=19mꢀ at VGS = - 4.5 V
MMBT3906
QTY
MANUFACTURER
Sunlord
1
2
3
4
5
L1
Q1
Q3
D1
D2
1
1
1
1
1
Vishay
Vishay
SS12, Vf=0.5V, 20V Schottky
1N4148, Vf=0.7V, 75V Schottky
Panjit
Vishay
6
C2,C5,C9
Ceramic capacitor, 22uF/10V, X7R, 1206
3
Murata/TDK
7
C3
Ceramic capacitor, 4.7uF/10V, X7R, 1206
Ceramic capacitor, 0.1uF/10V, X7R, 0603
Ceramic capacitor, 10nF/10V, X7R, 0603
Ceramic capacitor, 2.2nF/10V, X7R, 0603
Ceramic capacitor, 2.2uF/10V, X7R, 0603
Chip Resistor, 806ꢀ, 1/10W, 1%, 0603
Chip Resistor, 50mꢀ, 1/4W, 1%, 1206
Chip Resistor, 93.1kꢀ, 1/10W, 1%, 0603
Chip Resistor, 43.2kꢀ, 1/10W, 1%, 0603
Chip Resistor, 25kꢀ, 1/10W, 1%, 0603
Chip Resistor, 10kꢀ, 1/10W, 5%, 0603
Chip Resistor, 60kꢀ, 1/10W, 1%, 0603
Chip Resistor, 100kꢀ, 1/10W, 1%, 0603
Chip Resistor, 1ꢀ, 1/8W, 5%, 0805
1
1
1
1
4
1
2
1
2
1
1
1
1
1
1
1
2
2
1
2
1
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
8
C4
9
C6
C7
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
C8,C11,C12,C13
R1
R2,R2A
R3
R4,R17
R5
R6
R7
R8
R9
R10
Chip Resistor, 2.7ꢀ, 1/4W, 5%, 1206
Chip Resistor, 200kꢀ, 1/10W, 5%, 0603
Chip Resistor, 715kꢀ, 1/10W, 5%, 0603
Chip Resistor, 49.9kꢀ, 1/10W, 5%, 0603
Chip Resistor, 75kꢀ, 1/10W, 1%, 0603
Chip Resistor, 100kꢀ, 1/10W, 5%, 0603
Chip Resistor, 2.2ꢀ, 1/10W, 5%, 0603
R11
R12,R13
R14,R16
R15
R18,R19
R20
LED1,LED2,
LED3,LED4
28
LED, 0603, Blue
4
LED Manu
29
30
31
32
PB
USB
Push Button Switch
10.2*14.6*7mm, 4P
Nikkai Omron
1
1
1
1
Micro-USB
U1
MICRO USB 5P/F SMTB
IC, ACT2802, T-QFN 44-24
ACT
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ACT2802
Rev 0, 21-Jan-14
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 20, Ta = 25°C, unless otherwise specified)
Charge Current VS. Output Current
Battery Charge V/I Profile
2500
2000
1500
1000
3000
2500
2000
1500
1000
VIN = 5.0V
VBAT = 3.5V
VIN = 5.0V
CHRG = 2.1A
I
Input Current
Charge Current
500
0
500
0
0
500
1000
1500
2000
2500
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Output Current (mA)
Vbat (V)
Charge Efficiency
Boost Efficiency
100.0
90.0
80.0
70.0
60.0
50.0
40.0
92.0
91.5
91.0
90.5
90.0
VIN = 5.0V
ICHRG = 2.1A
Vbat=3.2V
Vbat=3.7V
Vbat=4.1V
89.5
89.0
0
300
600
900 1200 1500 1800 2100 2400
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Output Current (mA)
Vbat (V)
Boost Leakage VS. Temperature
(HZ Mode)
Battery Charge Current VS. Temperature
25.0
20.0
15.0
10.0
3000
VIN = 5.0V
VBAT = 3.5V
2500
2000
1500
1000
Vbat=3.5V
Vbat=4.1V
5.0
0
500
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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ACT2802
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TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 20, Ta = 25°C, unless otherwise specified)
Boost Output Constant Current Limit
Boost Output Voltage VS. Temperature
VS. Temperature
3000
2800
2600
2400
2200
5.4
5.3
5.2
5.1
5.0
VBAT = 3.5V
CV= 4.5V
Rcs=25mꢀ(1%)
VBAT = 3.5V
OUT = 5.05V
V
2000
1800
4.9
4.8
-20
0
20
40
60
80
100
120
140
-30
0
30
60
90
120
150
Temperature (°C)
Temperature (°C)
Boost Output Constant Current Limit
VS. Vbat
Boost Output Voltage VS. Output Current
5.05
5.01
4.97
4.93
4.89
4.85
2550
2500
2450
2400
2350
Vbat=3.2V
Vbat=4.15V
2300
2250
0
500
1000
1500
2000
2500
3000
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Boost Output Current (mA)
Vbat (V)
Boost Leakage VS. Battery Voltage
(HZ Mode)
Boost Standby Current VS. Battery Voltage
8.0
7.0
6.0
5.0
4.0
3.0
2.0
057
0.55
0.53
0.51
0.49
0.47
0.45
1.0
0
0
1.0
2.0
3.0
4.0
5.0
3.0
3.3
3.6
3.9
4.2
45
4.8
Battery Voltage(V)
Battery Voltage(V)
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ACT2802
Rev 0, 21-Jan-14
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 20, Ta = 25°C, unless otherwise specified)
Boost Load Transient (80mA-1A-80mA)
Boost Load Transient (1A-2.1A-1A)
VBAT = 3.4V
VOUT = 5.0V
IIOST = 2.4A
V
= 3.4V
= 5.0V
= 2.4A
BAT
V
OUT
I
IOST
CH1
CH1
CH2
CH2
CH1: VOUT, 100mV/div
CH2: IOUT, 1A/div
TIME: 1ms/div
CH1: VOUT, 100mV/div
CH2: IOUT, 1A/div
TIME: 1ms/div
SW and Output Waveforms in Boost Mode
SW and Output Waveforms in Boost Mode
VBAT = 4.1V
VOUT = 5.0V
IOUT = 2.4A
VBAT = 3.4V
VOUT = 5.0V
IOUT = 2.4A
CH1
CH1
CH2
CH2
CH1: VOUT, 20mV/div
CH2: VSW, 2V/div
TIME: 1us/div
CH1: VOUT, 20mV/div
CH2: VSW, 2V/div
TIME: 1us/div
Transition Between Buck Mode
and Boost Mode
VIN = 5.0V
VBAT = 4.1V
VIN
CH1
VnPG
CH2
CH3
Vout
CH1: VIN, 5V/div
CH2: VnPG, 5V/div
CH3: vout, 2V/div
TIME: 1s/div
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ACT2802
Rev 0, 21-Jan-14
PACKAGE OUTLINE
QFN44-24 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
0.200 REF
0.008 REF
0.180
3.850
3.850
2.500
2.500
0.300
4.150
4.150
2.800
2.800
0.007
0.152
0.152
0.098
0.098
0.012
0.163
0.163
0.110
0.110
D
E
D2
E2
e
0.500 BSC
0.020 BSC
L
0.350
0.450
---
0.014
0.018
---
R
0.200 TYP
0.008 TYP
K
0.200
0.008
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.
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