ACT2801QL-T1028 [ACTIVE-SEMI]
5V/1.5A Backup Battery Pack Manager;
| 型号： | ACT2801QL-T1028 |
| 厂家： | 
ACTIVE-SEMI, INC |
| 描述： | 5V/1.5A Backup Battery Pack Manager 电池 |
| 文件： | 总25页 (文件大小：2435K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
5V/1.5A Backup Battery Pack Manager
FEATURES
APPLICATIONS
Backup Battery Pack
Power Bank
Mobile Power
Standalone Battery Charger with USB Output
Dedicated Single Chip Solution for Mobile Power
With Minimal Component Count
5V/1.5A Constant Output Current Limit in Boost
Mode
1.5A Switching Charger 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
GENERAL DESCRIPTION
ACT2801/ACT2801B/ACT2801C is a space-saving
and high-performance low-profile single-chip
solution for backup battery pack and standalone
battery charger. ACT2801/ACT2801B/ACT2801C
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
ACT2801/ACT2801B/ACT2801C
operates
at
Battery Over Current, Over Voltage, Over
1.1MHz for switching charger and 0.55MHz for
boost converter allowing tiny external inductor and
Temperature and Short Circuit Protections
capacitors.
ACT2801/ACT2801B/ACT2801C
Boost Auto Startup with Load Detection
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.
Up to 2.0A Input Current Limit with Prioritized
Power Path to Output
5V+/-100mV Output Voltage in Boost Mode
1.1MHz/0.55MHz Switching Frequencies
ACT2801/ACT2801B/ACT2801C 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.
2.2uH SMD Inductor and Low Profile Ceramic
Capacitor
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
ACT2801/ACT2801B/ACT2801C 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
ACT2801/ACT2801B/ACT2801C provides 3.5mA
constant currents to drive 4 LEDs to indicate
battery level and charge status. Battery impedance
is compensated for battery level indication.
IC Over Temperature Protection at 160°C
QFN4x4-24 Package
Vbat
Boost CC/CV Curve
5.5
VBAT =3.7V
5.0
Vin
Vout
LED1 LED2 LED3
LED4 BAT
VOUT
VBAT =3.2V
VIN
RIMC
BLVS
TH
SW
4.5
4.0
Vbat
ACT2801
PB
L1 2.2uH
Rcs
50mΩ
R7
2.7Ω
PB
CSP
C3
22µF
10V
C1
4.7uF
10V
CSN
PGND
VBAT =4.1V
ILIM
AGND HZ BTV
IOST ICST
NTC
3.5
C2
22uF
10V
R3
R4
97.6k 39k
R1
R2
R5
100k
R6
60k
25k 1.5k
3.0
0
200
400
600
800
1000
1200
1400
GND
Output Current (mA)
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
ORDERING INFORMATION
LEDS AL-
LATCH OFF
BOOST
PB TURN
OFF BOOST
PART NUMBER
OUTPUT FLASHLIGHT
WAYS ON IN AT BOOST LIGHT LOAD PACKAGE
BOOST
No
UVLO
Yes
OFF TIME
16s
ACT2801QL-T1028
5V/1.5A
No
Yes
No
QFN44-24
QFN44-24
QFN44-24
ACT2801BQL-T1028 5V/1.5A
ACT2801CQL-T1028 5V/1.5A
Yes
Yes
Yes
No
Yes
Yes
16s
16s
No
PIN CONFIGURATION
TOP VIEW
24
22
23
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
9
10 11 12
7
8
QFN44-24
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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
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. PB starts up boost converter if HZ pin is grounded and
VIN is not present. For ACT2801B/ACT2801C, if this pin is pushed for 3s, flashlight is
enabled.
2
PB
3
4
AGND
nPG
Logic Ground. AGND must be connected to PGND externally through ground plane.
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 0.5A-2.0A.
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
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 must be connected to AGND externally through
ground plane.
11
12
PGND
BAT
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.
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 0.5A-1.5A.
Fast charge current setting pin. Connect a resistor from this pin to AGND to set the
charge current. The current setting ranges from 0.5A-1.5A.
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
21
LED1
LED2
LED3
LED4
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.
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.
22
23
RIMC
BLVS
Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery
LED indication thresholds.
TH: ACT2801
Temperature sensing input. Connect to battery thermistor terminal. If not use, put 10K
pull down resistor to AGND.
24
TH/FLD
EP
FLD: ACT2801B/ACT2801C
Open-drain flashlight driver. A internal switch can handle up to 50mA.
25
Exposed pad. Must be soldered to ground on the PCB.
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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
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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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
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
VIN Over Voltage Protection
Input Voltage Validation Time
Input Current Limit Setting Range
Input Current Setting
VIN rising, VIN_OVP
6.0
32
V
ms
A
VIN_UVLO<VIN<VIN_OVP
RILIM=1.2kΩ—4.8kΩ
RILIM=1.5kΩ
0.5
2.0
1.6
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
90
70
75
mΩ
mΩ
mΩ
Buck Converter
Switching Frequency
-15%
1.1
6
+15% MHz
High Side Switch Peak Current Limit
Minimum On-time
4.5
A
100
160
35
ns
℃
℃
Over Temperature Protection (OTP)
OTP Hysteresis
OTP rising
OTP falling
Charge Mode
Charge Current Setting Range
Rcs=50mΩ, RICST=20kΩ—60.4kΩ
Rcs=50mΩ, RICST=39kΩ
0.5
1.5
A
Charge Current Setting (ICHRG
Thermal Regulation Temperature
Battery Adjust Voltage(VBAJ
)
-10%
975
110
0.1
+10% mA
℃
Rbtv=25kΩ
V
)
End of Charge (EOC) Voltage
EOC Voltage Accuracy
-0.5% 4.1+VBAJ 0.5%
V
V
Rbtv=0
4.1
4.6
200
Battery Over Voltage Threshold
Battery Over Voltage Threshold Hysteresis
VBAT rising
VBAT falling
V
mV
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
Fast Charge Current
TEST CONDITIONS
VBAT=3.5V
MIN TYP MAX UNIT
ICHRG
10
A
%
V
Precondition Charge Current
Precondition Voltage Threshold
2.5V≤VBAT≤2.8V, Percent of ICHRG
VBAT rising, Rbtv=0
2.8
Precondition Voltage Threshold Hysteresis
Low VBAT Charge Current
130
200
13
mV
mA
%
VBAT=1V, RICST=39kΩ
EOC Current Threshold
Percent of the fast charge current
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, ACT2801 1.45
1.55
0.32
80
Hot detect NTC thermistor, ACT2801
ACT2801
0.28
20
V
mV
µA
Hz
TH Internal Pull-up Current
ACT2801
60
LED Flash Frequency
LED flash 1s on and 1s off
0.5
Charge Current Foldback
Charge Current Reduction Threshold1 of Vout1 Starting foldback point
4.59
3.0
4.7
4.81
4.5
V
V
Stop foldback point,
Charge Current Reduction Threshold2 of Vout1
RCS=50mΩ, RICST=39kΩ
4.57
Boost Mode
Input Voltage Operation Range
Switching Frequency
V
-15% 0.55 +15% MHz
Input Voltage UVLO
VBAT rising
VBAT falling
3.15
300
3.3
3.45
500
5.10
2
V
mV
V
Input Voltage UVLO Hysteresis
Output Voltage (VOUT)
400
4.97 5.05
Ta=25℃
Output Voltage Accuracy
All conditions
-3
VOUT
%
V
Output Voltage Transient Response
Output Over Voltage Protection
Output Over Voltage Protection Hysteresis
Output Current Regulation Range
Vbat=3.7V, 80mA-1A-80mA, 0.1A/us
VOUT rising
4.75
5.25
5.7
V
VOUT falling
300
mV
A
0.5
1.5
Rcs=50mΩ, RIOST=37.5kΩ—113kΩ
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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
Output Current Setting
TEST CONDITIONS
Rcs=50mΩ, RIOST=97.6kΩ
MIN TYP MAX UNIT
-10%
1.3
200
100
5.6
400
4.25
4.6
3
+10%
A
mV
ns
A
The Maximum Voltage Across VRcs
Minimum On-Time
All conditions
Low Side Switch Peak Current Limit
Soft-Startup Time
VBAT=3.2V, VOUT=5V
4.0
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
Hiccup mode
2
Light Load Current Shut off Threshold
Light Load Current Detect Time
HZ Pin High Voltage
VBAT=3.7V, Rcs=50mΩ, RIOST=97.6kΩ
40
100
1.4
mA
s
16
HZ voltage rising
HZ voltage falling
0.9
0.75
3
V
HZ Pin Low Voltage
0.4
V
HZ Internal Pull-up Resistor
PB Turn off Boost Time
MΩ
s
ACT2801
1.5
30
PB Turn on Boost Time
All condition
ms
PB is pushed and released, ACT2801/
ACT2801C
LED Indication Time
5
s
s
Mode Transition
Transition Waiting Time between Charge
Mode and Boost Mode
TRANTIME
2
Battery Level Indication
Battery Impedance Compensation Range
Battery Impedance Compensation
PB High Input Voltage
40
500
1.4
mΩ
mΩ
V
200
0.9
0.75
3
Rcs=50mΩ, RIMC=100kΩ
PB voltage rising
PB Low Input Voltage
PB voltage falling
0.4
V
PB Internal Pull-up Resistor
MΩ
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
Flashlight Driver
Flashlight Voltage UVLO
Flashlight rising, ACT2801B/ACT2801C
3.3
2.9
50
V
V
Flashlight Voltage UVLO Threshold Flashlight falling, ACT2801B/ACT2801C
Flashlight Driver Current
PB Turn on Flashlight Time
PB Turn off Flashlight Time
the current at FLD pin, ACT2801B/ACT2801C
ACT2801B/ACT2801C
mA
s
3.0
3.0
ACT2801B/ACT2801C
s
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
FUNCTIONAL BLOCK DIAGRAM FOR ACT2801
Body
Control
Q1
90mΩ
5V
5V
VIN
VOUT
COUT
UVLO
Current limit
Q2
70mΩ
ILIM
BLVS
RIMC
L1
2.2µH
Rcs
SW
Driver
PWM Controller
Power Management
+
-
VBAT
CSP
LED4
LED3
CSN
BAT
Battery Level
Indication
VBAT
LED2
LED1
Q3
75mΩ
TH
PB
HZ
BTV
ICST
IOST
AGND
PGND
NTC
CBAT
FUNCTIONAL BLOCK DIAGRAM FOR ACT2801B/ACT2801C
Body
Control
Q1
90mΩ
5V
5V
VIN
VOUT
COUT
UVLO
Current limit
Q2
70mΩ
ILIM
BLVS
RIMC
L1
2.2µH
Rcs
SW
Driver
PWM Controller
Power Management
+
-
VBAT
CSP
LED4
LED3
CSN
BAT
Battery Level
Indication
LED2
LED1
Q3
75mΩ
FLD
VBAT
PB
HZ
BTV
ICST
IOST
AGND
PGND
CBAT
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
FUNCTIONAL DESCRIPTION
ACT2801/ACT2801B/ACT2801C is
battery charging and discharging
a
complete
power
operation flow chart as shown in Figure 1, and
ACT2801B system operation flow chart as shown in
Figure 2.
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.
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.
The modes are determined by HZ pin and VIN pin
as shown in the table 1. A valid VIN voltage forces
ACT2801/ACT2801B/ACT2801C into charge mode.
Boost mode is enabled if HZ pin is pulled low and
VIN is invalid or not present. For ACT2801/
ACT2801B, when HZ=0, if PB is pulled low for more
than 30ms, boost converter is enabled. For
ACT2801, during boost on, if PB is pressed more
than 1.5s, boost converter will be off.
With
the
advanced
ACT2801/ACT2801B/
ACT2801C 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
Table 1: Mode Selection
current and higher conversion
achieved.
efficiency are
HZ PIN
VIN Valid
Mode
0
0
0
1
1
0
1
1
Modes of Operation
ACT2801/ACT2801B/ACT2801C has 3 operation
modes: 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. ACT2801 system
Boost
Charge
HZ
Charge
Flashlight
ACT2801B has an flashlight function. Once PB is
pressed for 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.
Figure 1:
ACT2801 System Operation Flow Chart
LED Charge Status and
Battery Level Indication
VIN Invalid and HZ=0
Taking 2s
VIN Valid
Boost Mode
(VOUT=5V)
Charge Mode
(4.5V<VIN<5.5V)
Taking 2s
P
B
i
s
p
r
e
s
s
e
d
f
o
:
r
3
0
h
m
s
t
s
i
m
W
0
3
0
r
=
o
Z
f
H
d
r
HZ: 0—>1 or HZ=0
e
V
o
s
LED Battery Level
Indication Turns on
for 5s
V
I
s
N
with: Vbat < 2.9V or PB
is pressed for 1.5s or
Iout < 40mA for 16s
0
I
e
r
N
V
>
I
a
—
n
p
l
1
v
i
d
s
a
:
i
l
i
Z
d
B
H
a
P
n
d
H
Z
=
1
s
m
0
HZ Mode
(Ibat<10µA)
3
r
o
f
d
e
s
s
e
r
p
s
i
B
P
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
FUNCTIONAL DESCRIPTION
Figure 2:
ACT2801B/ACT2801C System Operation Flow Chart
LED Charge Status and
Battery Level Indication
PB is pressed for 3s (VIN Valid)
Taking 2s
VIN Invalid and HZ=0
Charge Mode
(4.5V<VIN<5.5V)
Boost Mode
(VOUT=5V)
P
B
i
s
p
r
e
s
s
e
VIN Valid
Taking 2s
d
f
o
r
3
s
r
s
i
o
s
Flashlight On
0
B
m
0
V
>
9
P
.
3
V
I
s
6
2
f
d
—
r
n
1
o
<
N
1
f
a
:
t
r
V
Z
H
d
a
b
0
=
V
o
1
=
a
e
s
I
N
l
Z
H
V
i
A
:
h
s
Z
H
d
I
n
e
m
0
t
r
i
v
H
Z
p
a
w
4
l
i
d
0
=
<
=
1
t
a
Z
H
u
n
o
d
I
Boost LED Battery
Level Indication
Always on
r
r
o
o
HZ Mode
(Ibat<10µA)
0
=
Z
H
n
e
h
w
s
m
0
3
r
o
f
d
e
s
s
e
r
p
s
i
B
P
Latch-Off
Precondition Charge
ACT2801/ACT2801B has latch off function. If the IC
is in boost mode and the battery voltage drops
below the Boost Mode Input Voltage UVLO voltage
(typ 3.3V) minus Boost Mode Input Voltage UVLO
Hysteresis (typ 400mV), the IC latches into HZ
Mode. This safety feature prevents excessive
battery discharge. The IC only exits this mode when
input power is recycled.
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
Fast Charge
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.
If battery voltage is above preconditioning
threshold, buck converter charges battery with
constant current. In fast charge state, the ACT2801/
ACT2801B 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 ACT2801/ACT2801B
charges in top off state.
Switching Battery Charger
ACT2801/ACT2801B 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 3 and Figure 4.
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
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.
CC/CV Regulation Loop
There are CC/CV regulation loops built in ACT2801/
ACT2801B, 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.
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
FUNCTIONAL DESCRIPTION
End of Charge
When charges current decreases to 13% of set fast charge current, the buck converter goes into end of
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.
Figure 3.
Typical Li+ Charge Profile and ACT2801/ACT2801B/ACT2801C Charge States
VEOC
RECHARGE
FAST CHARGEB CURRENT
Current
A: PRECONDITION STATE
B: FAST-CHARGE STATE
Voltage
VPRECHARGE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
END-OF-CHARGE CURRENT
PRECONDITION CHARGE CURRENT
STATE
A
B
C
D
B
Figure 4.
Charger State Diagram
ANY STATE
BATTERY PLACED AND (VIN > VBAT
)
AND (VIN > UVLO) AND (VIN < VOVP
)
AND VBAT ≤ 2.8V
PRECONDITION
VBAT > 2.8V (Typical)
FAST CHARGE
VBAT = VEOC
IBAT > IEOC
TOP OFF
IBAT < IEOC
DELAY
END OF CHARGE
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ACT2801/ACT2801B/ACT2801C
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the compensated impedance. Those thresholds are
programmed by a resistor connected from BLVS
pin to AGND as shown in Figure 6. The following
equation shows the LED4 voltage threshold:
APPLICATIONS INFORMATION
Battery Charge Termination Voltage
Battery charge termination voltage is set by a
resistor Rbtv connected from BTV pin to AGND as
shown in Figure 5. The battery charge termination
voltage is estimated as the following equation:
VBATLED4(V ) 3.5(V ) 0.01(mA) RBLVS(k )
(2)
Input
Output
VOUT
VIN
Cout
L
VBAT (V ) 4.1(V ) Rbtv 4 106(V )
(1)
Rcs
SW
Rbtv is selected based on the battery voltage rating.
1% accuracy resistor is recommended for Rbtv.
RBLVS
Battery
BLVS
BAT
Input
Output
Cout
VIN
Figure 6. Battery level voltage shift setting circuit
Io
L
Rcs
SW
Rbtv
As long as LED4 is set, all the other 3 LED
thresholds is fixed as shown in the table 3:
BTV
Battery
CSP
CSN
Table 3: 4 LED Voltage Thresholds
RBLVS (ohm)
50K
60K
70K
80K
LED1
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 5. Battery terminal voltage setting circuit
LED2
LED3
LED Status Indication
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. 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.
Input Current Limit
An external resistor is used to set the input current
limit connected from ILIM pin to AGND as shown in
Figure 7. 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
2.4 (V)
RILIM (k )
IILIM (A)
(3)
Table2: LED Indication
(Boost or HZ Mode)
ACT2801QL-T1028 / ACT2801CQL-
Charge Mode
T1028 :PB time > 30ms
LED
LED1
LED2
LED3
LED4
LED1
LED2
LED3
LED4
VBAT<2.9V
2.9V≤VBAT<LED1
LED1≤VBAT<LED2
LED2≤VBAT<LED3
LED3≤VBAT<LED4
VBAT≥LED4
Flash
Flash
On
Off
Off
Off
Off
Off
Off
Off
Flash
On
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
Off
Off
Off
Off
Off
On
On
Flash
On
Off
Off
On
Flash
On
Off
On
On
On
Flash
Flash
On
On
On
On
On
On
VBAT≥LED4 (End of Charge)
On
On
On
On
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
Figure 11. Figure 12 gives out different fast charge
current with various RICST. The battery fast charge
current is estimated as the following equation:
Iin
Output
Cout
VIN
VOUT
SW
Input
Rcs
50mΩ
L
RICST (k )
RILIM
Ic(A) 1.25(A)
(4)
ILIM
Rcs(m )
Battery
Output
Cout
Input
VIN
RIN
VOUT
SW
Figure 7. Input current limit setting circuit
CIN
Ic
L
Input current limit at various resistor curve is shown
in Figure 8.
RICST
Rcs
50mΩ
Battery
ICST
CSP
CSN
3.0
VIN = 5.0V
Figure 11. Battery fast charge current setting
2.5
2.1
2.0
1.5
VIN = 5.0V
Vbat=3.7V
1.8
1.5
1.2
0.9
0.6
0.3
0
1.0
0.5
0
0.7 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7
RILIM (kΩ)
Input current limit setting
The ILIMFigure 8.
is proportional to input current until input current is
limited, as shown in Figure 9.
pin voltage
0
10
20
30
40
50
60
70
80
RICST (kΩ)
Figure 12. Battery fast charge current setting
Boost
Output Constant Current
1.4
Boost output current is set by a resistor connected
from IOST pin to AGND as shown in Figure 13. The
boost output current is estimated as the following
equation:
VIN = 5.0V
RILIM=1.5kΩ
1.2
1.0
0.8
0.6
0.4
0.2
2
RIOST (k )
Rcs (m )
IIOST (A) (A)
(5)
3
Output
Cout
VOUT
Io
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Rcs
50mΩ
Input current (A)
Figure 9. VILIM VS. input current
L
SW
RIOST
IOST
Battery
In
application,
CSP
CSN
if fast charge current setting is higher than input
current limit, must be parallel a 0.47uF capacitor
with RILIM as shown in Figure 10.
Figure 13. Boost output current setting circuit
Figure
14
Iin
gives out boost output current with various RIOST
.
Output
VIN
VOUT
Input
Cout
L
1.9
Rcs
50mΩ
VBAT = 3.7V
CVout=4.5V
CILIM
1.6
SW
Battery
1.3
1.0
0.7
0.4
ILIM
RILIM
Figure 10. Input current limit smaller than fast charge current
Battery Fast Charge Current
20
40
60
80
100
120
140
Battery fast charge current is set by a resistor
connected from ICST pin to AGND as shown in
RIOST (kΩ)
Boost output current setting
The IOSTFigure 14.
pin
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
The IOST pin voltage is proportional to output
current until output current is limited, as shown in
Figure 15.
Input
VIN
Rcs
50mΩ
L 2.2uH
R1 2.7Ω
SW
900
C1 4.7uF
VBAT = 3.7V
RIOST=97.6kΩ
750
BAT
Battery
600
450
300
150
0
Figure 17. Input over voltage surge protection circuit
Boost Output Plug-in Auto Detection
Figure 18 provides a solution for auto plug-in
0
0.2
0.4
0.6
0.8
1.0
1.2
detection.
Output current(A)
Figure 15. VIOST VS. output current
VBAT
Battery
Impedance Compensation
715K
PB
Rcs
50mΩ
L 2.2uH
PB
SW
An external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 16. RIMC
is corresponding to battery impedance. Higher RIMC
gives higher compensation voltage which is
positively proportional to battery charge/discharge
current.
200K
2.2uF
715K
2.2uF
BAT
Battery
HZ
VOUT
+
D-
COUT
D+
-
USB Shielding Ground
Select RIMC based on battery impedance:
Figure 18. Boost output auto detection circuit
25 R (m )
(6)
R
IMC(k )
Rcs (m )
VBAT (V ) BAT(V ) IBAT (A) R(m )10-3
External Input Over Voltage Protection
(7)
Considering the maximum voltage rating at VIN pin,
the external OVP circuit as shown in Figure 19 is
recommended if input voltage may go higher than
7V. With the enhanced OVP circuit, the design can
pass UN38.3.
Input
Output
VOUT
VIN
Cout
L
Rcs
R:
SW
Battery Impedance
RIMC
Si2365EDS
Input
IBAT
RIMC
R
VIN
Battery
package
BAT
10k
Q2
3906
2.7Ω
Q1
Figure 16. Battery impedance compensation setting circuit
4.7k
4.7uF
D1
5.6V
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
10k
Table 4: Battery Impedance
Figure 19. Input over voltage protection
RIMC(KΩ)
50
50
100
100
200
200
200
400
Inductor and Capacitor Selection
Rcs=25mΩ
Rcs=50mΩ
Battery
Impedance
ACT2801/ACT2801B/ACT2801C 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, 2*22uF ceramic capacitors are
recommended.
R(mΩ)
100
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 17.
Battery Temperature Monitoring
ACT2801 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
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
limits.
In a typical application, the TH pin is connected to
the battery pack's thermistor input as shown in
Figure 20. The ACT2801 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=5kΩ
60µA×RNOM×kCOLD=1.5V → RNOM×kCOLD= 25kΩ
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.
60µA
+
VTHH
Li+ Battery
Pack
+
-
TH
+
-
NTC
VTHL
–
Figure 20. Battery thermal circuit
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
PC Board Layout Guidance
When laying out the printed circuit board, the
following checklist should be used to ensure proper
operation of the IC.
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.
1. Arrange the power components to reduce the
AC loop size, VIN pin, Vout pin, SW pin and the
schottky diode.
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 ACT2801/
ACT2801B/ACT2801C 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.
8. RC snubber is recommended to add across SW
to PGND to reduce SW spike below 7V.
2A /20V schottky is added to across VOUT and
SW pins.
A demo board PCB layout example is shown in the
figure 21.
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.
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
Figure 21.
PCB Layout
Bottom Layer
Top Layer
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
R12
HZ
LED1
PB
R16
R5
PB
BTV
R4
AGND
ICST
R11
C12
R3
nPG
R13
IOST
R1
C11
CSN
CSP
ILIM
VIN
Input USB
C6
+
D-
R10
C3
D+
-
D2
R14
C2
D1
C8
Q1
+
R2
L1
D-
C4
C13
D+
-
R15
R9
C7
USB Output
BAT
C5
Figure 22. ACT2801 typical application circuit
(Input current limit 2.0A, fast charge current limit 1.5A, boost output constant current limit 1.3A)
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
Table 5: BOM List
ITEM
1
REFERENCE
DESCRIPTION
QTY MANUFACTURER
L1
SWPA4020S1R0NT 2.2uH 3.4A (4*4*2mm)
SI2333DDS, Rdson=28mΩ at VGS = - 4.5 V
MBR1020VL, 20V/1A, Schottky
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
4
1
1
1
1
Sunlord
Vishay
2
Q1
3
D1
Panjit
4
D2
1N4148, Vf=0.7V, 75V Schottky
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
SART
5
C2,C5
Ceramic Capacitor, 22uF/10V, X7R, 1206
Ceramic Capacitor, 4.7uF/10V, X7R, 1206
Ceramic Capacitor, 0.1uF/10V, X7R, 0603
Ceramic Capacitor, 10nF/10V, X7R, 0402
Ceramic Capacitor, 4.7nF/10V, X7R, 0603
Ceramic Capacitor, 1uF/10V, X7R, 0603
Ceramic Capacitor, 2.2uF/10V, X7R, 0603
Ceramic Capacitor, 4.7uF/10V, X7R, 0603
Chip Resistor, 1.2kΩ, 1/16W, 1%, 0402
Chip Resistor, 50mΩ, 1/2W, 1%, 1206
Chip Resistor, 97.6kΩ, 1/16W, 1%, 0402
Chip Resistor, 60.4kΩ, 1/16W, 1%, 0402
Chip Resistor, 25kΩ, 1/16W, 1%, 0402
Chip Resistor, 10kΩ, 1/16W, 1%, 0402
Chip Resistor, 60kΩ, 1/16W, 1%, 0402
Chip Resistor, 100kΩ, 1/16W, 1%, 0402
Chip Resistor, 0.47Ω, 1/8W, 5%, 0805
Chip Resistor, 2.7Ω, 1/4W, 5%, 1206
Chip Resistor, 200kΩ, 1/10W, 5%, 0603
Chip Resistor, 715kΩ, 1/10W, 5%, 0603
Chip Resistor, 100kΩ, 1/10W, 5%, 0603
Chip Resistor, 2.2Ω, 1/10W, 5%, 0603
Chip Resistor, 100Ω, 1/10W, 5%, 0603
LED, 0603, Blue
6
C3
7
C4
8
C6
9
C7
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
C8
C11,C12
C13
R1
R2
R3
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
LED Manu
Nikkai Omron
R4
R5
R6
R7
R8
R9
R10
R11
R12,R13
R14
R15
R16
LED1,LED2, LED3,LED4
PB
USB
Push Button Switch
10.2*14.6*7mm, 4P
Micro-USB
U1
MICRO USB 5P/F SMT B
IC, ACT2801QL-T1028, T-QFN 44-24
ACT
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
R12
HZ
LED1
PB
R16
R5
PB
BTV
R4
AGND
ICST
R11
C12
R3
nPG
R13
IOST
R1
C11
CSN
CSP
ILIM
VIN
Input USB
C6
+
D-
R10
C3
D+
-
D2
R14
C2
D1
C8
Q1
+
R2
L1
D-
C4
C13
D+
-
R15
R9
C7
USB Output
BAT
C5
Figure 23. ACT2801B/ACT2801C typical application circuit
(Input current limit 2.0A, fast charge current limit 1.5A, boost output constant current limit 1.3A)
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
Table 6: BOM List
ITEM
REFERENCE
DESCRIPTION
QTY MANUFACTURER
1
L1
SWPA4020S1R0NT 2.2uH 3.4A (4*4*2mm)
SI2333DDS, Rdson=28mΩ at VGS = - 4.5 V
MBR1020VL, 20V/1A, Schottky
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
4
1
1
1
1
1
Sunlord
Vishay
2
Q1
3
D1
Panjit
4
D2
1N4148, Vf=0.7V, 75V Schottky
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
SART
5
C2,C5
Ceramic Capacitor, 22uF/10V, X7R, 1206
Ceramic Capacitor, 4.7uF/10V, X7R, 1206
Ceramic Capacitor, 0.1uF/10V, X7R, 0603
Ceramic Capacitor, 10nF/10V, X7R, 0402
Ceramic Capacitor, 4.7nF/10V, X7R, 0603
Ceramic Capacitor, 1uF/10V, X7R, 0603
Ceramic Capacitor, 2.2uF/10V, X7R, 0603
Ceramic Capacitor, 4.7uF/10V, X7R, 0603
Chip Resistor, 1.2kΩ, 1/16W, 1%, 0402
Chip Resistor, 50mΩ, 1/2W, 1%, 1206
Chip Resistor, 97.6kΩ, 1/16W, 1%, 0402
Chip Resistor, 60.4kΩ, 1/16W, 1%, 0402
Chip Resistor, 25kΩ, 1/16W, 1%, 0402
Chip Resistor, 60kΩ, 1/16W, 1%, 0402
Chip Resistor, 100kΩ, 1/16W, 1%, 0402
Chip Resistor, 0.47Ω, 1/8W, 5%, 0805
Chip Resistor, 2.7Ω, 1/4W, 5%, 1206
Chip Resistor, 200kΩ, 1/10W, 5%, 0603
Chip Resistor, 715kΩ, 1/10W, 5%, 0603
Chip Resistor, 100kΩ, 1/10W, 5%, 0603
Chip Resistor, 2.2Ω, 1/10W, 5%, 0603
Chip Resistor, 100Ω, 1/10W, 5%, 0603
Chip Resistor, 51Ω, 1/8W, 5%, 0805
LED, 0603, Blue
6
C3
7
C4
8
C6
9
C7
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
C8
C11,C12
C13
R1
R2
R3
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
LED Manu
LED Manu
Nikkai Omron
R4
R5
R7
R8
R9
R10
R11
R12,R13
R14
R15
R16
R17
LED1,LED2, LED3,LED4
LED
PB
Flashlight
Push Button Switch
USB
10.2*14.6*7mm, 4P
Micro-USB
U1
MICRO USB 5P/F SMT B
IC, ACT2801B/ACT2801C, T-QFN 44-24
ACT
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ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 22, Ta = 25°C, unless otherwise specified)
Charge Current VS. Output Current
Battery Charge V/I Profile
1800
1500
1200
900
2100
VIN = 5.0V
VBAT = 3.5V
VIN = 5.0V
ICHRG = 1.5A
1800
1500
Input Current
1200
Charge Current
900
600
600
300
0
300
0
0
300
600
900
1200
1500
1800
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Output Current(mA)
Vbat (V)
Boost Efficiency
Charge 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 = 1.5A
VBAT = 3.2V
VBAT = 3.7V
VBAT = 4.1V
89.5
89.0
0
200
400
600
800
1000
1200
1400
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Output Current (mA)
Vbat (V)
Battery Leakage VS. Temperature
Battery Charge Current VS. Temperature
(HZ Mode)
1800
1500
1200
900
25.0
20.0
15.0
10.0
VIN = 5.0V
VBAT = 3.5V
VBAT = 3.5V
VBAT = 4.1V
600
5.0
0
300
0
-20
0
20
40
60
80
100
120
140
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Innovative PowerTM
- 22 -
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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 22, Ta = 25°C, unless otherwise specified)
Boost Output Constant Current Limit
Boost Output Voltage VS. Temperature
VS. Temperature
1400
5.4
5.3
5.2
5.1
5.0
VBAT = 3.5V
CV = 4.5V
Rcs=50mΩ(1%)
VBAT = 3.5V
VOUT = 5.05V
1350
1300
1250
1200
1150
4.9
4.8
-30
0
30
60
90
120
150
-30
0
30
60
90
120
150
Temperature (°C)
Temperature (°C)
Boost Output Constant Current Limit
VS. VBAT
Boost Output Voltage VS. Output Current
1330
1325
1320
1315
1310
5.15
5.10
5.05
5.00
4.95
4.90
VBAT = 4.1V
VBAT = 3.2V
1305
1300
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0
200
400
600
800
1000
1200
1400
Vbat (V)
Boost Output Current (mA)
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
051
0.50
0.49
0.48
0.47
0.46
0.45
1.0
0
0
1.0
2.0
3.0
4.0
5.0
2.8
3.1
3.4
3.7
4.0
4.3
4.6
Battery Voltage(V)
Battery Voltage(V)
Innovative PowerTM
- 23 -
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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 22, Ta = 25°C, unless otherwise specified)
Boost Load Transient (80mA-1A-80mA)
Boost Load Transient (80mA-1A-80mA)
VBAT = 3.4V
VOUT = 5.0V
IIOST = 1.3A
VBAT = 4.1V
VOUT = 5.0V
IIOST = 1.3A
CH1
CH1
CH2
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 500mA/div
TIME: 1ms/div
CH1: VOUT, 200mV/div
CH2: IOUT, 500mA/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 = 1.0A
VBAT = 3.4V
VOUT = 5.0V
IOUT = 1.0A
CH1
CH2
CH1
CH2
CH1: VOUT, 10mV/div
CH2: VSW, 2V/div
TIME: 400ns/div
CH1: VOUT, 10mV/div
CH2: VSW, 2V/div
TIME: 400ns/div
Transition Between Buck Mode
and Boost Mode
VIN = 5.0V
VIN
VBAT = 4.1V
CH1
VnPG
CH2
CH3
VOUT
CH1: VIN, 5V/div
CH2: VnPG, 5V/div
CH3: VOUT, 2V/div
TIME: 1s/div
Innovative PowerTM
- 24 -
www.active-semi.com
Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
PACKAGE OUTLINE
QFN44-24 PACKAGE OUTLINE AND DIMENSIONS
D
DIMENSION IN
MILLIMETERS
DIMENSION IN
INCHES
D/2
SYMBOL
MIN
0.800
0.000
MAX
1.000
0.050
MIN
0.032
0.000
MAX
0.040
0.002
A
A1
A3
b
E/2
E
PIN #1 INDEX AREA
D/2 x E/2
0.200 REF
0.008 REF
0.180
0.300
0.007
0.012
D
4.000 BSC
4.000 BSC
0.160 BSC
0.160 BSC
E
D2
E2
e
2.500
2.800
2.800
0.098
0.110
0.110
A
2.500
0.098
A3
A1
0.500 BSC
0.020 BSC
D2
L
b
L
0.350
0.450
0.014
0.018
R
0.200 TYP
0.008 TYP
e
K
0.200
---
0.008
---
E2
PIN #1 INDEX AREA
D/2 x E/2
K
R
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
- 25 -
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Copyright © 2015-2017 Active-Semi, Inc.
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