Preliminary Datasheet
LP28300
2A Synchronous Buck Li-ion Charger
General Description
The LP28300 is a 2A Li-Ion battery charger. It utilizes
a 500KHz synchronous buck converter topology to
reduce power dissipation during charging. Low power
dissipation, an internal MOSFET allow a physically
small charger that can be embedded in a wide range
of handheld applications. The LP28300 includes
complete charge termination circuitry, automatic
recharge.
Battery
charge
current,
charge
timeout
and
end-of-charge indication parameters are set with
external components. Additional features include
shorted cell detection; temperature qualified charging
and overvoltage protection. The LP28300 is available
in a low profile ESOP8/TDFN-10 3*3mm and package.
□
Battery Voltage
Default:4.2V
H : 4.35V
F: Pb-Free
Package Type
SP: ESOP8
QV: TDFN-10
Battery
cell
A: 1 cell
B: 2 cell
C: 3 cell
Features
Input voltage range 4V~18V
Dynamic input current allocation for maximum
charging rate
2.0A Maximum Charge Current
No External MOSFETs and Blocking Diode
Required
Efficiency up to 90%
Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
Optional Battery Temperature Monitoring Before
and During Charge Automatic Sleep Mode for
Low-Power
Over Current Protection
Consumption Available in ESOP8/TDFN-10
RoHS Compliant and 100% Lead (Pb)-Free
Order Information
LP28300
□
□□
□
Applications
Portable Media Players
Cellular and Smart mobile phone
PDA/DSC
Handheld Battery-Powered Devices
Handheld Computers
Charging Docks and Cradles
LP28300-03
Apr.-2018
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 1 of 10
Preliminary Datasheet
LP28300
Marking Information
Device
LP28300ASPF
LP28300AQVF
Marking
LPS
LP28300A
YWX
LPS
LP28300AH
YWX
Package
ESOP8
TDFN-10
ESOP8
TDFN-10
Shipping
4K/REEL
5K/REEL
4K/REEL
5K/REEL
Device
LP28300BSPF
LP28300BQVF
LP28300CSPF
LP28300CQVF
LP28300ASPFH
LP28300AQVFH
Marking indication:
Marking
LPS
LP28300B
YWX
LPS
LP28300C
YWX
Package
ESOP8
TDFN-10
ESOP8
TDFN-10
Shipping
4K/REEL
5K/REEL
4K/REEL
5K/REEL
Y: Year code. W: Week code. X: Batch numbers.
Typical Application Circuit
VIN
4.7uH
VIN
R1
100K
22uF
PMID
BST
RS
REG
NTC
R4
1.1K
R2
100K
GND
STAT
BAT
2K
VIN
SW
RSNS
47nF
25mΩ
22uF
R3
3.9K
VBAT
10uF
LP28300AQVF
LP28300AQVF Application Circuit
VIN
4.7uH
VIN
R1
100K
BST
RS
REG
NTC
R4
1.1K
R2
100K
GND
LP28300ASPF
STAT
BAT
2K
VIN
SW
RSNS
47nF
25mΩ
22uF
R3
3.9K
VBAT
10uF
LP28300ASPF Application Circuit
LP28300-03
Apr.-2018
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 2 of 10
Preliminary Datasheet
Functional Pin Description
Package Type
SW
BST
1
2
3
4
ESOP8
GND
9
8
7
6
5
LP28300
Pin Configurations
VIN
REG
RS
BAT
REG
1
VIN
2
PMID
3
SW
4
GND
5
TDFN-10
10
RS
9
BAT
11
GND
8
BST
7
STAT
6
NTC
ESOP8 / TDFN-10
STAT
NTC
Pin Description
Pin
ESOP8
SW
BST
STAT
TDFN-10
1
2
3
Name
4
8
7
Description
Switch pin. Connect to external inductor.
Internal charge pump boost pin.
Open-Drain Charge Status Output. When the battery is charging, this pin is
pulled low by an internal N-channel MOSFET. When the LP28300 detects an
under voltage lockout condition, STAT is forced high impedance.
NTC (Negative Temperature Coefficient) Thermistor Input. This pin senses the
NTC
BAT
RS
4
5
6
6
9
10
temperature of the battery pack and stops the charger when the temperature is
out of range. Connect to GND for disabling this function.
Battery pin.
Detecting pin of charge current.
Input voltage feedback for the input voltage regulation loop. Connect to tap of an
REG
7
1
external resistor divider from VIN to GND to program the input voltage
regulation. Once the voltage at REG pin drops to the inner threshold, the charge
current is reduced to maintain the input voltage at the regulation value.
VIN
GND
PMID
8
Pad
2
5,11
3
Positive Supply Voltage Input. Decouple with a 10µF or larger surface mounted
ceramic capacitor.
Ground.
Power MOS input pin. Connect a 22uF Capacitor to ground.
LP28300-03
Apr.-2018
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 3 of 10
Preliminary Datasheet
Absolute Maximum Ratings
Note 1
LP28300
VIN /PMID /BST/NTC to GND ----------------------------------------------------------------------------------------- 24V
REG Voltage to GND --------------------------------------------------------------------------------------------------- 6.5V
BAT Pin to GND ---------------------------------------------------------------------------------------------------------- 20V
Maximum Junction Temperature ---------------------------------------------------------------------------------- 150℃
Operating Ambient Temperature Range (T
A
) -------------------------------------------------------- -40℃ to 85℃
Maximum Soldering Temperature (at leads, 10 sec) --------------------------------------------------------- 260℃
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.
Note 1.
Thermal Information
Maximum Power Dissipation (ESOP8, P
D
, T
A
=25℃) ----------------------------------------------------------- 2W
Thermal Resistance (ESOP8, θ
JA
) ----------------------------------------------------------------------------- 50℃/W
Maximum Power Dissipation (TDFN-10, P
D
, T
A
=25℃) ------------------------------------------------------- 1.5W
Thermal Resistance (TDFN-10, θ
JA
) --------------------------------------------------------------------------- 65℃/W
ESD Susceptibility
HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV
MM(Machine Mode) --------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
Operating Junction Temperature Range (T
J
) ----------------------------------------------------- -40℃ to 150℃
Ambient Temperature Range --------------------------------------------------------------------------- -40℃ to 85℃
LP28300-03
Apr.-2018
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 4 of 10
Preliminary Datasheet
Electrical Characteristics
LP28300
(The specifications which apply over the full operating temperature range, otherwise specifications are at
T
A
=25℃, V
IN
= 5V, unless otherwise noted.)
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
IN
I
CC
Adapter/USB Voltage Range
Input Supply Current
Standby Mode
(Charge Terminated)
LP28300AQVF/SPF
4
1
4.158
4.306
4.2
4.35
8.4
12.6
50
1000
2000
4
100
20
2.8
100
1
I
STAT
=5mA
V
FLOAT
-V
RECHRG
150
150
R
SNS
=50mΩ
V
IN
rising
V
IN
falling
100
4.1
3.9
70
30
500
18
V
mA
4.242
4.395
V
V
V
mV
mA
mA
μA
mA
mA
V
mV
V
V
FLOAT
Regulated Output (Float) Voltage
LP28300AQVF/SPFH
LP28300BQVF/SPF
LP28300CQVF/SPF
V
RS
Program Charging Current
(For RS to BAT)
BAT Pin Current
V
TRIKL
<V
BAT
<V
FLOAT
R
SNS
=50mΩ, Current Mode
I
BAT
R
SNS
=25mΩ, Current Mode
Standby Mode
V
BAT
<V
TRIKL
, R
SNS
=50mΩ
V
BAT
<2.3V
R
SNS
=50mΩ, V
BAT
Rising
R
SNS
=50mΩ
I
TRIKL
V
TRIKL
V
TRHYS
V
REG
V
STAT
ΔV
RECHRG
T
LIM
I
TERM
UVLO
V
NTC-H
V
NTC-L
F
OSC
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
Input voltage regulation reference
STAT Pin Output Low Voltage
Recharge Battery Threshold
Voltage
Junction Temperature in Constant
Temperature Mode
C/10 Terminal Current
Under Voltage Lockout of VIN
Threshold Voltage of V
NTC
rising
Threshold Voltage of V
NTC
falling
Frequency
0.5
V
mV
℃
mA
V
V
%V
IN
%V
IN
KHz
LP28300-03
Apr.-2018
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 5 of 10
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