ACT2813 [ACTIVE-SEMI]
5V/2.4A Power Bank Solution;
| 型号： | ACT2813 |
| 厂家： | 
ACTIVE-SEMI, INC |
| 描述： | 5V/2.4A Power Bank Solution |
| 文件： | 总23页 (文件大小：646K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACT2813/ACT2813C
Rev 2, 19-May-15
5V/2.4A Power Bank Solution
FEATURES
APPLICATIONS
• Power Bank
• Mobile Power
• Backup Battery Pack
• Standalone Battery Charger with USB Output
• Dedicated Single Chip Solution for Mobile Power
With Minimal Component Count
• 2.4A Continuous Output Current in Boost Mode
• 2.4A Switching Charger Current
• 96% Boost Efficiency (Vbat=4.1V)
• Adaptive to 10mA-2400mA Input Sources
• Battery Disconnection at Output Short
GENERAL DESCRIPTION
ACT2813/ACT2813C is a space-saving and high-
performance low-profile single-chip solution for
backup battery pack and standalone battery
charger. ACT2813/ACT2813C 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
Temperature and Short Circuit Protections
ACT2813/ACT2813C operates at 1.1MHz for
switching charger and 0.55MHz for boost converter
allowing tiny external inductor and capacitors.
ACT2813/ACT2813C provides a direct power path
from input to output while providing power to
switching charger. Output has higher priority than
battery charger if the input current limit is reached.
• Boost Auto Startup with Load Detection
• Prioritized Power Path from Input to Output
• 5V+/-100mV Output Voltage in Boost Mode
• 1.1MHz/0.55MHz Switching Frequencies
• 2.2uH Inductor and Low Profile Ceramic
Capacitor
ACT2813/ACT2813C 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.
• 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
ACT2813/ACT2813C 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
• FCQFN 4x4-20 Package
ACT2813/ACT2813C provides 3.5mA constant
currents to drive 4 LEDs to indicate battery level
and charge status. Battery impedance is
compensated for battery level indication.
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
0.4
0.8
1.2
1.6
2.0
2.4
2.8
Output Current (A)
Innovative PowerTM
- 1 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
ORDERING INFORMATION
CHARGE
CURRENT
BATTERY
VOLTAGE
PART NUMBER
OUTPUT
FLASHLIGHT
TH PIN
PACKAGE
ACT2813QY-T
5V/2.4A
2.4A
4.2V
No
Yes
FCQFN 4x4-20
ACT2813QY-T0435
ACT2813CQY-T
5V/2.4A
5V/2.4A
2.4A
2.4A
2.4A
4.35V
4.2V
No
Yes
Yes
Yes
No
FCQFN 4x4-20
FCQFN 4x4-20
FCQFN 4x4-20
ACT2813CQY-T0435 5V/2.4A
4.35V
No
PIN CONFIGURATION
Innovative PowerTM
- 2 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
1
LED1
Battery level indicator. An internal 3.5mA sink current limit is built in.
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-3.0A.
2
3
4
ICST
IOST
CSP
Output current setting. Connect a resistor from this pin to AGND to set output constant
current. The current setting ranges from 1.0A-3.0A.
Positive terminal of charge current sense input. Kevin sense is required with 10nF
ceramic capacitor right across CSP and CSN pins.
Battery input and negative terminal of charge current sense 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.
5
6
VBAT/CSN
PGND
Power ground. PGND is connected to the source of low-side N-channel MOSFET and
the MOSFET’s gate driver. PGND must be connected to AGND externally through
ground plane.
7, 8
9
SW
VOUT
VIN
Internal switch to output inductor terminal.
Output pin. Bypass to PGND with a high quality low ESR and ESL ceramic capacitor
placed as close to the IC as possible.
10
11
USB or AC adaptor input. When VIN is valid, charge and power path is enabled.
Analog ground. AGND must be connected to PGND externally through ground plane.
AGND
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.
12
13
nPG
PB
Push button input, connect a push button from this pin to AGND, internally pulled up
by a 3MΩ resistor to battery. PB starts up boost converter if HZ pin is grounded and
VIN is not present. When this pin is pushed for 30ms, LED1-4 indicators are enable for
5 seconds.
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.
14
15
HZ
TH: ACT2813
Temperature sensing input. Connect to battery thermistor terminal. If no use, put 10K
pulled down resistor.
TH/FLD
FLD: ACT2813C
Open-drain flashlight driver. A internal switch can handle up to 50mA.
Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery
LED indication thresholds.
16
17
BLVS
RIMC
Battery impendence compensation input. Connect to a resistor from this pin to APNG
to program the battery impedance.
18
19
20
21
LED4
LED3
LED2
EP
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.
Exposed pad. Must be soldered to ground on the PCB.
Innovative PowerTM
- 3 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
ABSOLUTE MAXIMUM RATINGSc
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
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.
Innovative PowerTM
- 4 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
UNI
T
PARAMETER
Input Current Limit
TEST CONDITIONS
MIN
TYP
MAX
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
Leakage Current from VOUT to VIN in Boost
Mode
0
10
15
µA
µA
3.0V<VBAT<4.2V, Ta=25℃
3.0V<VBAT<4.2V, Ta=25℃
Battery Discharge Current in High-Z Mode
Power Switches
7.5
VIN-to-VOUT FET on Resistance
VOUT-to-SW FET on Resistance
SW-to-PGND FET on Resistance
Buck Converter
60
45
45
mΩ
mΩ
mΩ
Switching Frequency
-15%
4.5
1.1
6
+15% MHz
High Side Switch Peak Current Limit
Minimum On-time
A
100
160
35
ns
℃
℃
Over Temperature Protection (OTP)
OTP Hysteresis
OTP rising
OTP falling
Charge Mode
Charge Current Setting Range
Rcs=25mΩ, RICST=20kΩ—60kΩ
Rcs=25mΩ, RICST=48kΩ
1.0
3.0
A
A
Charge Current Setting (ICHRG
)
-10%
2.4
110
4.2
+10%
Thermal Regulation Temperature
End of Charge (EOC) Voltage
℃
V
ACT2813/ACT2813C
ACT2813-T0435/ACT2813C-T0435
VBAT rising
-0.5%
-0.5%
+0.5%
+0.5%
4.35
4.6
V
Battery Over Voltage Threshold
Battery Over Voltage Threshold Hysteresis
Fast Charge Current
V
VBAT falling
200
ICHRG
10
mV
A
VBAT=3.5V
Precondition Charge Current
2.4V≤VBAT≤2.8V, Percent of ICHRG
VBAT rising
%
V
Precondition Voltage Threshold
Precondition Voltage Threshold Hysteresis
2.8
130
mV
Innovative PowerTM
- 5 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
Low VBAT Charge Current
VBAT=1V, RICST=48kΩ
200
15
mA
%
VBAT=4.2V, percent of the fast
charge current
EOC Current Threshold
Charge Restart Voltage Threshold
TH Upper Temperature Voltage Threshold
200
1.5
mV
V
Cold detect NTC thermistor,
ACT2813
Hot detect NTC thermistor,
ACT2813
TH Lower Temperature Voltage Threshold
0.3
V
TH Hysteresis
ACT2813
ACT2813
50
60
mV
µA
TH Internal Pull-up Current
Charge Current Foldback
Charge Current Reduction Threshold1 of Vout1 Starting foldback point
4.59
4.7
4.81
4.5
V
V
Stop foldback point, RCS=25mΩ,
ICST=48kΩ
Charge Current Reduction Threshold2 of Vout1
4.57
R
Boost Mode
Input Voltage Operation Range
Switching Frequency
3.0
V
-15%
0.55
3.3
+15% MHz
Input Voltage UVLO
VBAT rising
V
Input Voltage UVLO Hysteresis
Output Voltage (VOUT)
Output Voltage Accuracy
VBAT falling
400
mV
4.97
-3
5.05
VOUT
5.10
2
V
%
V
Ta=25℃
All conditions
80mA-1A-80mA, 0.1A/us
1A-2.4A-1A, 0.1A/us
4.75
4.7
5.25
5.25
Output Voltage Transient Response
V
Output Over Voltage Protection
Output Over Voltage Protection Hysteresis
Output Current Regulation Range
Output Current
VOUT rising
5.7
V
VOUT falling
300
mV
A
1.0
3.0
Rcs=25mΩ, RIOST=37.4kΩ—113kΩ
Rcs=25mΩ, RIOST=91kΩ
All conditions
-10%
2.4
200
100
6.8
+10%
A
mV
ns
A
The Maximum Voltage Across VRcs
Minimum On-Time
Low Side Switch Peak Current Limit
VBAT=3.6V, VOUT=5V
5.6
Innovative PowerTM
- 6 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
Soft-Startup Time
400
4.25
4.6
3
µs
V
VOUT falling
VOUT rising
Under Voltage Protection (UVP Threshold)
V
UVP Blanking Time During Startup
UVP Sense Detection Time
Restart After UVP
ms
µs
s
VOUT falling
20
2
Hiccup mode
Light Load Current Shut off Threshold
VBAT=3.7V, Rcs=25mΩ,RIOST=91kΩ
40
100
1.4
mA
Light Load Current Detect Time
HZ Pin High Voltage
16
0.9
0.75
3
s
V
HZ voltage rising
HZ voltage falling
HZ Pin Low Voltage
0.4
V
HZ Internal Pull-up Resistor
PB Turn off Boost Time
PB Turn on Boost Time
MΩ
s
ACT2813
1.5
30
ms
Mode Transition
Transition Waiting Time between Charge
Mode and Boost Mode
TRANTIME
2
s
Battery Level Indication
Battery Impedance Compensation Range
Battery Impedance Compensation
PB Deglitch Time
40
500
1.4
mΩ
mΩ
ms
V
200
30
Rcs=25mΩ, RIMC=200kΩ
PB High Input Voltage
PB voltage rising
PB voltage falling
0.9
0.75
3
PB Low Input Voltage
0.4
V
PB Internal Pull-up Resistor
LED Indication Time
MΩ
s
PB is pushed and released
5
LED Flash Frequency
Charging, LED flash 1s on and 1s off
0.5
Hz
Flashlight Driver
Flashlight Driver Current
PB Turn on Flashlight Time
PB Turn off Flashlight Time
ACT2813C, the current at FLD pin
ACT2813C
50
3.0
3.0
mA
s
ACT2813C
s
Innovative PowerTM
- 7 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
FUNCTIONAL BLOCK DIAGRAM FOR ACT2813
FUNCTIONAL BLOCK DIAGRAM FOR ACT2813C
Innovative PowerTM
- 8 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
FUNCTIONAL DESCRIPTION
ACT2813/ACT2813C is
a
complete battery
switches Q1-Q3 into HZ mode for 2 seconds before
enabling the other mode.
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. If output voltage
drops below 4.25V, the input switch Q1 turns off
and restart in 2 seconds.
The modes are determined by HZ pin and VIN pin
as shown in the table 1. A valid VIN voltage forces
ACT2813/ACT2813C 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 30ms, boost converter is enabled.
For ACT2813, a running boost is disabled if one of
the following conditions is met:
With the advanced ACT2813/ACT2813C
architecture, a 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.
1. Boost converter output current is below light
load threshold for 16 seconds.
2. Battery voltage falls below the boost cut-off
threshold.
3. After PB is released, if PB is pulled low for more
than 1.5 seconds.
Modes of Operation
ACT2813/ACT2813C has
3 operation modes:
Table 1: Mode Selection
charge mode, boost mode and high-impedance
(HZ) mode. In charge mode, the input current limit
Q1 is enabled and 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 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. ACT2813 system operation
flow chart as shown in Figure 1 and ACT2813C
system operation flow chart as shown in Figure 2.
HZ PIN
VIN Valid
Mode
0
0
0
1
1
0
1
1
Boost
Charge
HZ
Charge
Flashlight
ACT2813C has an flashlight function. Once PB is
pressed for more than 3 seconds, the flashlight is
switched on. The driver will deliver up to 50mA
current to the flashlight. During flashlight on, if PB is
pressed for 3 seconds, flashlight will be switched
off.
Any transitions between boost mode and charge
mode go through HZ mode by turning off all the
Figure 1:
ACT2813 System Operation Flow Chart
Innovative PowerTM
- 9 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
Figure 2:
ACT2813C System Operation Flow Chart
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.
Latch-Off
ACT2813/ACT2813C has latch off function. If
discharging stops due to battery cut-off, and latch
off will be triggered, it would prevent battery from
discharging again, latch-off is released when input
power is recycled.
Fast Charge
If battery voltage is above preconditioning
threshold, buck converter charges battery with
constant current. In fast charge state, the ACT2813/
ACT2813C 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 ACT2813/ACT2813C
charges in top off state.
Switching Battery Charger
ACT2813/ACT2813C is configured in charge mode
(buck mode) when VIN is valid. In this mode, the
battery is charged with preconditioning, fast charge,
top-off and end of charge (EOC). The typical charge
management is shown in Figure 3 and Figure 4.
CC/CV Regulation Loop
Top Off
There are CC/CV regulation loops built in ACT2813/
ACT2813C, 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
to decrease as necessary to maintain charging at
the termination voltage.
With the battery voltage approaches the EOC
voltage, 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 the end of charge (EOC)
threshold, defined as 15% of fast charge current.
When this happens, the state machine terminates
the charge cycle and jumps to the EOC state.
End of Charge
Precondition Charge
When charges current decreases to 15% of set fast
charge current, the buck converter goes into end of
charge mode and keep monitoring the battery
voltage.
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
Innovative PowerTM
- 10 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
Recharge
When battery voltage drops by 200mV below the end of charge voltage, the charger is reinitiated with con-
stant current charge.
Figure 3.
Typical Li+ Charge Profile and ACT2813/ACT2813C Charge States
A: PRECONDITION STATE
B: FAST-CHARGE STATE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
Figure 4.
Charger State Diagram
Innovative PowerTM
- 11 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
table 3. The LED status is based on battery voltage
and operation modes. When battery voltage is low,
LED1 is flashing. In charge mode, when a battery is
fully charged, flashing stops and all the 4 LEDs are
solid on.
APPLICATIONS INFORMATION
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
programmed by a resistor connected from BLVS
pin to AGND as shown in Figure 5. The following
equation shows the LED4 voltage threshold:
Fast Charge Current
Battery fast charge current is set by a resistor
connected from ICST pin to AGND as shown in
Figure 6.
The battery fast charge current is estimated as the
following equation:
VBATLED4(V ) = 3.5(V )+0.01(mA)×RBLVS(kΩ )
(1)
RICST (kΩ )
Rcs(mΩ )
Ic(A) =1.25(A)×
(2)
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 2:
Figure 6. Battery fast charge current setting circuit
Table 2: 4 LED Voltage Thresholds
Figure 7 gives out different fast charge current with
various RICST
.
RBLVS (ohm)
LED1
50K
60K
70K
80K
3.0
2.5
2.0
1.5
1.0
0.5
3.55V
3.65V
3.80V
4.00V
3.65V
3.75V
3.90V
4.10V
3.75V
3.85V
4.00V
4.20V
3.85V
3.95V
4.10V
4.30V
VIN = 5.0V
Vbat=3.7V
LED2
LED3
LED4
0
0
LED Status Indication
10
20
30
40
50
60
RICST (kΩ)
4 LEDs ON/OFF and flash show the charge status
and the remained capacity level as shown in the
Figure 7. Battery fast charge current setting
Table 3: LED Indication
Charge Mode
PB time>30ms (Boost or HZ Mode)
LED
LED1
Flash
LED2
Off
LED3
LED4
Off
LED1
Off
LED2
Off
LED3
Off
LED4
Off
VBAT<2.9V
Off
2.9V≤VBAT<LED1
LED1≤VBAT<LED2
LED2≤VBAT<LED3
LED3≤VBAT<LED4
VBAT≥LED4
Flash
On
Off
Flash
On
Off
Off
Off
Off
Flash
On
Off
Off
On
On
On
On
Off
Off
Off
On
On
On
Off
Off
Off
Off
On
On
On
Flash
On
Off
On
On
On
Flash
Flash
On
On
On
On
On
On
VBAT≥LED4 (End of Charge)
On
On
On
On
Innovative PowerTM
- 12 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
Select RIMC based on battery impedance:
Boost Output Constant Current
25 × R (mΩ )
Rcs (m Ω )
(4)
(5)
R
IMC(kΩ ) =
Boost output current is set by a resistor connected
from IOST pin to AGND as shown in Figure 8. The
boost output current is estimated as the following
equation:
VBAT(V ) = BAT(V )−IBAT(A)×R(mΩ )×10-3
2
RIOST (kΩ )
Rcs (mΩ )
IIOST (A) = ( A)×
(3)
3
Figure 11. Battery impedance compensation setting circuit
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
Figure 8. Boost output current setting circuit
Table 4: Battery Impedance
Figure 9 gives out boost output current with various
RIOST
RIMC(KΩ)
50
50
100
100
200
200
200
400
.
Battery
Impedance
R(mΩ)
Rcs=25mΩ
Rcs=50mΩ
3.0
2.5
VBAT = 3.7V
CVout=4.5V
100
2.0
1.5
1.0
0.5
0
Boost Output Plug-in Auto Detection
Figure 12 provides a solution for auto plug-in
detection.
0
20
40
60
80
100
120
RIOST (kΩ)
Figure 9. Boost output current setting
The IOST pin voltage is proportional to output
current until output current is limited, as shown in
Figure 10.
900
VBAT = 3.7V
RIOST=100kΩ
750
600
450
300
150
0
Figure 12. Boost output auto detection circuit
External Input Over Voltage Protection
Considering the maximum voltage rating at VIN pin,
the external OVP circuit as shown in Figure 13 is
recommended if input voltage may go higher than
7V. With the enhanced OVP circuit, the design can
pass UN38.3.
0
0.4
0.8
Output Current(A)
Figure 10. VIOST VS. output current
1.2
1.6
2.0
2.4
2.8
Battery Impedance Compensation
An external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 11. RIMC
is corresponding to battery impedance. Higher RIMC
gives higher compensation voltage which is
positively proportional to battery charge/discharge
current.
Figure 13. Input over voltage protection
Innovative PowerTM
- 13 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
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 15. Battery thermal circuit
Figure 14. Input over voltage surge protection circuit
Inductor and Capacitor Selection
ACT2813/ACT2813C 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,
22uFx3 ceramic capacitors are recommended.
Battery Temperature Monitoring
ACT2813 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.
In a typical application, the TH pin is connected to
the battery pack's thermistor input as shown in
Figure 15. The ACT2813 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 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.
Innovative PowerTM
- 14 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
PC Board Layout Guidance
When laying out the printed circuit board, the
following checklist should be used to ensure proper
operation of the IC.
Sense from sense resistor R1 and R2 to CSP
and CSN pins. 22uF decoupling capacitor is
added close to VBAT pin.
1. Arrange the power components to reduce the
AC loop size, VIN pin, Vout pin, SW pin and the
schottky diode.
5. Place the ceramic capacitor C2 and D1 as
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.
2. Place input decoupling ceramic capacitor C1
and R9 as close to VIN pin as possible.
Resistor R9 is added in series with capacitor
C1 to damp the potential LC resonance .
6. RC snubber is recommended to add across SW
to PGND to reduce EMI noise.
A demo board PCB layout example is shown in the
figure 16.
3. Use copper plane for power GND for best heat
dissipation and noise immunity.
4. Place CSP and CSN capacitor C7 (10nF) close
to CSP and CSN pin as possible, use Kevin
Figure 16.
PCB Layout
Top Layer
Bottom Layer
Innovative PowerTM
- 15 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
Figure 17. ACT2813 typical application circuit
(Fast charge current set is 2.4A, boost output constant current set is 2.66A)
Innovative PowerTM
- 16 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
Table 5:
BOM List
ITEM
REFERENCE
DESCRIPTION
Core, 6.5*3*3 Dip, 2.2uH, 6A, Rdson=5mꢀ
AO4503, Rdson=19mꢀ at VGS = - 4.5 V
MMBT3906
QTY
MANUFACTURER
Sunlord
1
2
3
L1
Q1
Q2
1
1
1
AOS
Vishay
SBR3U20SA, 20V/3A Schottky
MBRA210LT3G, 10V/2A Schottky
Diodes
On-semi
4
D1
1
5
6
D2
C1
1N4148, Vf=0.7V, 75V Schottky
1
1
Vishay
Ceramic capacitor, 4.7uF/10V, X7R, 0805
Murata/TDK
7
C2,C3,C4,C9
C5,C6
C7
Ceramic capacitor, 22uF/10V, X7R, 1206
Ceramic capacitor, 2.2uF/10V, X7R, 0603
Ceramic capacitor, 10nF/10V, X7R, 0603
Ceramic capacitor, 0.1uF/10V, X7R, 0603
Ceramic capacitor, 10uF/10V, X7R, 0805
Ceramic capacitor, 4.7nF/10V, X7R, 0603
Chip Resistor, 50mꢀ, 1/4W, 1%, 1206
Chip Resistor, 100kꢀ, 1/10W, 1%, 0603
Chip Resistor, 48kꢀ, 1/10W, 1%, 0603
Chip Resistor, 68kꢀ, 1/10W, 5%, 0603
Chip Resistor, 60.4kꢀ, 1/10W, 1%, 0603
Chip Resistor, 0ꢀ, 1/10W, 1%, 0603
Chip Resistor, 2.7ꢀ, 1/8W, 1%, 0805
Chip Resistor, 100ꢀ, 1/10W, 1%, 0603
Chip Resistor, 715kꢀ, 1/10W, 5%, 0603
Chip Resistor, 200kꢀ, 1/10W, 5%, 0603
Chip Resistor, 10kꢀ, 1/10W, 5%, 0603
Chip Resistor, 0.47ꢀ, 1/4W, 1%, 1206
Chip Resistor, 43.2kꢀ, 1/10W, 1%, 0603
Chip Resistor, 49.9kꢀ, 1/10W, 1%, 0603
4
2
1
1
1
1
2
2
1
1
1
3
1
1
1
2
1
1
2
2
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
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
C8
C10
C11
R1,R2
R3,R10
R4
R5
R6
R7,R8,R12
R9
R13
R15
R16,R19
R17
R18
R20,R22
R21,R23
LED1,LED2
LED3,LED4
27
LED, 0603, Blue
4
LED Manu
LED Manu
28
29
30
31
PB
USB
Push Button
1
1
1
1
10.2*14.6*7mm, 4P, DIP
MICRO USB 5P/F SMT B
IC, ACT2813, FCQFN 4x4-20
Micro-USB
U1
ACT
Innovative PowerTM
- 17 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
Figure 18. ACT2813C typical application circuit
(Fast charge current set is 2.4A, boost output constant current set is 2.66A)
Innovative PowerTM
- 18 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
Table 5:
BOM List
ITEM
REFERENCE
DESCRIPTION
Core, 6.5*3*3 Dip, 2.2uH, 6A, Rdson=5mꢀ
AO4503, Rdson=19mꢀ at VGS = - 4.5 V
MMBT3906
QTY
MANUFACTURER
Sunlord
1
2
3
L1
Q1
Q2
1
1
1
AOS
Vishay
SBR3U20SA, 20V/3A Schottky
MBRA210LT3G, 10V/2A Schottky
Diodes
On-semi
4
D1
1
5
6
D2
C1
1N4148, Vf=0.7V, 75V Schottky
1
1
Vishay
Ceramic capacitor, 4.7uF/10V, X7R, 0805
Murata/TDK
7
C2,C3,C4,C9
C5,C6
C7
Ceramic capacitor, 22uF/10V, X7R, 1206
Ceramic capacitor, 2.2uF/10V, X7R, 0603
Ceramic capacitor, 10nF/10V, X7R, 0603
Ceramic capacitor, 0.1uF/10V, X7R, 0603
Ceramic capacitor, 22uF/10V, X7R, 0805
Ceramic capacitor, 4.7nF/10V, X7R, 0603
Chip Resistor, 50mꢀ, 1/4W, 1%, 1206
Chip Resistor, 100kꢀ, 1/10W, 1%, 0603
Chip Resistor, 48kꢀ, 1/10W, 1%, 0603
Chip Resistor, 68kꢀ, 1/10W, 5%, 0603
Chip Resistor, 60.4kꢀ, 1/10W, 1%, 0603
Chip Resistor, 0ꢀ, 1/10W, 1%, 0603
Chip Resistor, 2.7ꢀ, 1/8W, 1%, 0805
Chip Resistor, 51ꢀ, 1/8W, 1%, 0805
Chip Resistor, 100ꢀ, 1/10W, 1%, 0603
Chip Resistor, 715kꢀ, 1/10W, 5%, 0603
Chip Resistor, 200kꢀ, 1/10W, 5%, 0603
Chip Resistor, 0.47ꢀ, 1/4W, 1%, 1206
Chip Resistor, 43.2kꢀ, 1/10W, 1%, 0603
Chip Resistor, 49.9kꢀ, 1/10W, 1%, 0603
4
2
1
1
1
1
2
2
1
1
1
3
1
1
1
1
2
1
2
2
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
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
C8
C10
C11
R1,R2
R3,R10
R4
R5
R6
R7,R8,R12
R9
R11
R13
R15
R16,R19
R18
R20,R22
R21,R23
LED1,LED2
LED3,LED4
27
LED, 0603, Blue
4
LED Manu
LED Manu
28
29
30
31
32
LED5
PB
Flashlight
1
1
1
1
1
Push Button
USB
10.2*14.6*7mm, 4P, DIP
MICRO USB 5P/F SMT B
IC, ACT2813C, FCQFN 4x4-20
Micro-USB
U1
ACT
Innovative PowerTM
- 19 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 17, Ta = 25°C, unless otherwise specified)
Weak Input Source
Battery Charge V/I Profile
3000
2500
2000
1500
1000
2500
VIN = 5.0V
CHRG = 2.4A
VIN = 5.0V
ICHRG = 2.4A
I
2000
VIN
VOUT
1500
1000
500
0
500
0
4.2
4.4
4.6
4.8
5.0
5.2
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Voltage (V)
Battery Voltage (V)
Charge Efficiency
Boost Efficiency
100.0
90.0
80.0
70.0
60.0
50.0
40.0
91.5
91.0
90.5
90.0
89.5
VIN = 5.0V
ICHRG = 2.4A
VBAT = 3.2V
VBAT = 3.7V
VBAT = 4.1V
89.0
88.5
0
500
1000
1500
2000
2500
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Output Current (mA)
Battery Voltage (V)
Battery Leakage VS. Temperature
(HZ Mode)
Battery Charge Current VS. Temperature
25.0
20.0
15.0
10.0
3000
2500
2000
1500
1000
VIN = 5.0V
VBAT = 3.5V
VBAT = 3.7V
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)
Innovative PowerTM
- 20 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 17, Ta = 25°C, unless otherwise specified)
Boost Output Constant Current Limit
Boost Output Voltage VS. Temperature
VS. Temperature
3000
5.4
5.3
5.2
5.1
5.0
VBAT = 3.7V
VBAT = 3.5V
VOUT = 5.05V
I
OST=2.66A
2800
2600
2400
2200
CV= 4.5V
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 Voltage VS. Output Current
Boost Output Constant Current Limit VS. VBAT
5.1
5.06
5.02
4.98
4.94
4.9
2800
2750
2700
2650
2600
VBAT=4.1V
VBAT = 3.2V
2550
2500
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)
Battery Voltage (V)
Battery 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)
Innovative PowerTM
- 21 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 17, Ta = 25°C, unless otherwise specified)
Boost Load Transient (80mA-1A-80mA)
Boost Load Transient (1A-2.4A-1A)
VBAT = 3.7V
VOUT = 5.0V
IIOST = 2.66A
V
= 3.7V
= 5.0V
= 2.66A
BAT
V
OUT
I
IOST
CH1
CH1
CH2
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 400µs/div
CH1: VOUT, 100mV/div
CH2: IOUT, 1A/div
TIME: 400µs/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: 1µs/div
CH1: VOUT, 20mV/div
CH2: VSW, 2V/div
TIME: 1µs/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
Innovative PowerTM
- 22 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Rev 2, 19-May-15
PACKAGE OUTLINE
FCQFN 4x4-20 PACKAGE OUTLINE AND DIMENSIONS
DIMENSION IN
MILLIMETERS
DIMENSION IN
INCHES
SYMBOL
MIN
0.800
—-
MAX
0.900
0.050
MIN
0.031
—-
MAX
0.035
0.002
A
A1
A3
b
0.203 REF
0.008 REF
0.200
3.950
1.550
0.300
4.050
1.650
0.008
0.156
0.061
0.012
0.159
0.065
D
D1
D2
0.750
0.850
0.030
0.033
e
0.500 BSC
0.020 BSC
E
3.950
1.450
0.950
4.050
1.550
1.050
0.156
0.057
0.037
0.159
0.061
0.041
E1
E2
L1
L2
L3
L4
0.450
0.950
1.050
1.200
0.550
1.050
1.150
1.300
0.018
0.037
0.041
0.047
0.022
0.041
0.045
0.051
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
- 23 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
相关型号：
©2020 ICPDF网 联系我们和版权申明