Preliminary Datasheet
LP28019
10V/1.2A Single-chip Li-ion and Li-POL Charge
General Description
The LP28019 is a complete constant-current/ constant-
voltage linear charger for single cell lithium-ion batteries.
Its TDFN-10 package and low external component count
make the LP28019 ideally suited for portable applications.
Furthermore, the LP28019 is specifically designed to work
within USB power specifications. Its have a over voltage
protection in input with 6.5V and support over zero
voltages of battery can charge enable.
No external sense resistor is needed, and no blocking diode
is required due to the internal MOSFET architecture.
Thermal feedback regulates the charge current to limit the
die temperature during high power operation or high
ambient temperature. The charge voltage is fixed at 4.2V,
and the charge current can be ISET rammed externally with
a single resistor. The LP28019 automatically terminates the
charge cycle when the charge current drops to 1/10th the
ISET rammed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LP28019 automatically enters a low current
state, dropping the battery drain current to less than 2µA.
The LP28019 can be put into shutdown mode, reducing the
supply current to 25µA.
Other features include charge current monitor, undervoltage
lockout, automatic recharge and a status pin to indicate
charge termination and the presence of an input voltage.
Features
Very Low Power Dissipation
Vin Over Voltage Protection:6.5V
Short-circuit protection
Programmable Charge Current Up to 1500mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Constant-Current/Constant-Voltage Operation with
Thermal Regulation to Maximize Charge Rate Without
Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly from USB
Port
25µA Supply Current in Shutdown
Time Pre-charge Conditioning With Safety Timer
Reverse Leakage Protection Prevents Battery
Drainage Charge Current Thermal Regulation Status
Outputs for LED or System Interface
Indicates Charge and Fault Conditions
Optional Battery Temperature Monitoring Before and
During Charge Automatic Sleep Mode for Low-Power
Consumption Available in SOP-8P Package
RoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
Order Information
LP28019
□ □ □
F: Pb-Free
Package Type
SP: ESOP-8(P)
SO:SOP-8
VIN
RED
1
2
ACIN
CHRG_S
BATT
NC
8
7
10uF
BATTERY
10uF
4
9
GND
GND
LP28019SPF
ISETA
5
I
Set
=1000/Rset
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA/DSC
Marking Information
Please see website.
Bluetooth Applications
LP28019 – 000 Version 1.0 Datasheet
FEB.-2012
www.lowpowersemi.com
Page 1 of 9
Preliminary Datasheet
Functional Pin Description
P a c k a g e Ty p e
Pin Configurations
LP28019
ACIN
1
LP28019
8
7
9
PGND
6
5
BATT
NC
NC
ISETA
SOP-8(P)
CHG_S 2
NC
GND
3
4
Pi n Desc ript ion
PIN
VIN
STAT
NC
VSS/PGND
PIN
Number
1
2
3,6,7
4,9
DESCRIPTION
VIN is the input power source. Connect to a wall adapter.
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low by
an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled High.
No connector.
VSS is the connection to system ground.
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is pro-
grammed by connecting a 1% resistor(R
PROG
)to ground. When charging in constant-current
ISET
5
mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the
charge current using the following formula:
I
BAT
= (V
PROG
/R
PROG
) • 1000
BATT
8
VBAT is the connection to the battery. Typically a 1µF 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.
LP28019 – 000 Version 1.0 Datasheet
FEB.-2012
www.lowpowersemi.com
Page 2 of 9
Preliminary Datasheet
Function Block Diagram
VIN
LP28019
VSS
ISET
STAT
LP28019
Absolute Maximum Ratings
Input Voltage to GND (VIN) ----------------------------------------------------------------------------- 2.6V to 10V
BAT, ISET, STAT (VX) ---------------------------------------------------------------------- 0.3V to VIN+0.3V
BAT Short-Circuit Duration ---------------------------------------------------------------------------- Continuous
BAT Pin Current ------------------------------------------------------------------------------------------ 1500mA
Maximum Junction Temperature ---------------------------------------------------------------------------- 125°C
Operating Junction Temperature Range (TJ) ----------------------------------------------------- -40℃ to 85°C
Maximum Soldering Temperature (at leads, 10 sec) ------------------------------------------------------ 260°C
Thermal Information
Maximum Power Dissipation (PD,TA<40°C) -------------------------------------------------------------- 1.5W
Thermal Resistance (JA) --------------------------------------------------------------------------------- 46℃/W
LP28019 – 000 Version 1.0 Datasheet
FEB.-2012
www.lowpowersemi.com
Page 3 of 9
Preliminary Datasheet
LP28019
Electrical Characteristics
(The specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. VCC = 5V, unless otherwise noted.)
SYMBOL
V
IN
I
CC
PARAMETER
Adapter/USB Voltage Range
Input Supply Current
CONDITIONS
Charge Mode (Note 4), R
ISET
= 10k
Standby Mode (Charge Terminated)
Shutdown Mode (R
ISET
Not
Connected,
V
CC
< V
BAT
, or V
CC
< V
UV
)
0°C
≤
T
A
≤
85°C, I
BAT
= 40mA
R
ISET
= 1k, Current Mode
R
ISET
= 2k, Current Mode
MIN
2.65
TYP.
5
300
200
MAX UNITS
7
V
2000
500
uA
V
mA
V
FLOAT
Regulated Output (Float) Voltage
4.158
I
BAT
BAT Pin Current
Standby Mode, V
BAT
= 4.2V
Shutdown Mode (R
ISET
Not
Connected) Sleep Mode, V
CC
= 0V
V
BAT
< V
TRIKL
, R
ISET
= 2k (Note 5)
R
ISET
= 10k, V
BAT
Rising (Note 5)
R
ISET
= 10k (Note 5)
0
I
TRIKL
V
TRIKL
V
TRHYS
V
UV
V
UVHYS
V
MSD
V
ASD
I
TERM
V
ISET
I
STAT
V
STAT
ΔV
RESTAT
T
LIM
R
ON
t
SS
I
ISET
VIN OVP
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
V
CC
Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
V
CC
– V
BAT
Lockout Threshold
Voltage
C/10 Termination Current Threshold
ISET Pin Voltage
STAT Pin Weak Pull-Down Current
STAT Pin Output Low Voltage
V
CC
Undervoltage Lockout Threshold From V
CC
Low to High
ISET Pin Rising
ISET Pin Falling
V
CC
from Low to High
V
CC
from High to Low
R
ISET
= 10k (Note 6)
R
ISET
= 2k
R
ISET
= 10k, Current Mode
V
STAT
= 5V
I
STAT
= 5mA
2.8
60
3.7
150
1.15
0.9
70
5
0.085
0.085
0.9
8
100
Recharge Battery Threshold Voltage V
FLOAT
- V
RESTAT
Junction Temperature in Constant Temperature Mode
Power FET “ON” Resistance (Between V
CC
and BAT)
Soft-Start Time
ISET Pin Pull-Up Current
Over voltage protection
I
BAT
= 0 to I
BAT
=850V/R
ISET
25
50
4.2
4.242
1000
50
-2.5
-6
±1
±2
±1
±2
50
2.9
3.0
80
110
3.8
3.95
200
300
1.21
1.30
1.0
1.1
100
140
30
50
0.10 0.115
0.10 0.115
1.0
1.1
20
35
0.35
0.6
150
200
120
600
100
3
6.2
6.5
uA
mA
V
mV
V
mV
V
V
mV
mV
mA/mA
mA/mA
V
uA
V
mV
°C
mΩ
uS
uA
V
5.9
LP28019 – 000 Version 1.0 Datasheet
FEB.-2012
www.lowpowersemi.com
Page 4 of 9
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