Preliminary Datasheet
LP28056
1.2A Single-chip Li-ion Battery Charge
General Description
Features
constant-current/
Programmable Charge Current Up to 1200mA
for
No MOSFET, Sense Resistor or Blocking Diode
Required
Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
1µA Supply Current in Shutdown
feedback regulates the charge current to limit the die
4.2V Charge Voltage with ± 1% Accuracy
temperature during high power operation or high
Short-circuit protection
ambient temperature. The charge voltage is fixed at
Consumption Available in ESOP-8 Package
4.2V, and the charge current can be RISET rammed
RoHS Compliant and 100% Lead (Pb)-Free
The
LP28056
constant-voltage
is
a
complete
linear
charger
single
cell
lithium-ion batteries. Its ESOP-8 package and low
external component count make the LP28056 ideally
suited for portable applications. No external sense
resistor is needed, and no blocking diode is required
due to the internal MOSFET architecture. Thermal
externally with a single resistor. The LP28056
automatically terminates the charge cycle when the
charge current drops to 1/10th the RISET rammed value
Applications
after the final float voltage is reached. When the input
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA/DSC
Bluetooth Applications
supply is removed, the LP28056 automatically enters
a low current state, dropping the battery drain current
to less than 1µA. The LP28056 can be put into
shutdown mode, reducing the supply current to 1µA.
Other features include charge current monitor, under
voltage lockout, automatic recharge and a status pin to
indicate charge termination and the presence of an
input voltage.
Marking Information
Device
Marking
Package
Shipping
LP28056SPF
LPS
SP:ESOP-8
2.5K/REEL
LP28056
Order Information
LP28056 □ □ □
F: Pb-Free
YWX
Marking indication:
Y:Production year W:Production week
X:Production batch.
Package Type
SP: ESOP-8
LP28056-02
Mar.-2017
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 1 of 8
Preliminary Datasheet
LP28056
Typical Application Circuit
VIN
LP28056SPF
4
6
7
10uF
3
VIN
BAT
STAT2
ISET
5
2
10uF
BATTERY
STAT1
Riset
1K
VSS
PGND
9
Functional Pin Description
Package Type
Pin Configurations
ESOP-8
NC
1
ISET
2
VSS
3
VIN
4
PGND
9
8
NC
7
STAT1
6
STAT2
5
BAT
Pin Description
Pin
Name
Description
1
NC
No Connector.
2
ISET
Charge Current Program, Charge Current Monitor and Shutdown Pin.
3
VSS
VSS is the connection to system ground.
4
VIN
VIN is the input power source. Connect to a wall adapter.
5
BAT
BAT is the connection to the battery. Typically a 10µF Tantalum capacitor is needed for stability when there
is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is required.
Open-Drain Charge Status Output. When the battery is charging, the STAT pin could be pulled High by an
6
STAT2
external pull high resistor. When the charge cycle is completed, the pin is pulled Low by an internal
N-channel MOSFET.
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low by an internal
7
STAT1
N-channel MOSFET. When the charge cycle is completed, the pin could be pulled High by an external pull
high resistor.
8
NC
9
PGND
LP28056-02
No Connector.
Ground.
Mar.-2017
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 2 of 8
Preliminary Datasheet
LP28056
Function Block Diagram
4
145℃
TA
TDIE
VIN
1X
1200X
-
NC
TTEMP
BAT
5μA
+
MA
5
R1
1
TTEMP
VA
CA
- +
45%VIN
+
-
R2
SCHMITT
6
STAT2
SHDN
C1
-
REF
1.22V
+
R3
1V
R4
7 STAT1
C2
C3
+
0.1V
-
R5
+
-
TO BAT
3μA
VCC
2.9V
2
ISET
VSS
3
Absolute Maximum Ratings Note 1
Input to GND(VIN) ---------------------------------------------------------------------------------------------- -0.3V to 8V
BAT to GND ----------------------------------------------------------------------------------------------------- -0.3V to 7V
Other Pin to GND ----------------------------------------------------------------------------------------------- -0.3V to 6V
BAT Short-circuit Duration ----------------------------------------------------------------------------------- Continuous
Maximum Junction Temperature ---------------------------------------------------------------------------------- 150℃
Storage Temperature ------------------------------------------------------------------------------------- -45℃ to 165℃
Operating Ambient Temperature Range (TA) -------------------------------------------------------- -40℃ to 85℃
Maximum Soldering Temperature (at leads, 10 sec) -------------------------------------------------------- 260℃
Note 1.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress
ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Thermal Information
Maximum Power Dissipation ( PD,TA=25℃) ----------------------------------------------------------------------- 2W
Thermal Resistance (θJA) ------------------------------------------------------------------------------------------ 50℃/W
ESD Susceptibility
HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV
MM(Machine Mode) --------------------------------------------------------------------------------------------------- 200V
LP28056-02
Mar.-2017
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 3 of 8
Preliminary Datasheet
LP28056
Electrical Characteristics
(TA=25℃. VIN=5V, unless otherwise noted.)
Symbol
Parameter
VIN
Adapter/USB Voltage Range
ICC
Input Supply Current
Condition
Min
Typ
Max
Units
4.5
5
6.5
V
Charge Mode, RISET=10k
300
2000
μA
Standby Mode
(Charge Terminated)
300
500
μA
50
μA
Shutdown Mode (RISET NC)
VFLOAT
IBAT
Regulated Output (Float) Voltage
BAT Pin Current
IBAT=40mA
4.158
4.2
4.242
V
RISET=1k VTRIKL
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