Preliminary Datasheet LP4067

800mA Single Chip Li-ion and Li-Polymer Charger

General Description Features

The LP4067 is a complete constant-current/ constant  Input Voltage up to 30V
voltage linear charger for single cell lithium-ion battery.  Battery Maximum Voltage up to 20V
Its SOT23-6 package and low external component  Input Over Voltage Protection：6.3V
count make the LP4067 ideally suited for portable  Short-circuit protection
applications. No external sense resistor is needed,  Programmable Charge Current up to 800mA
and no blocking diode is required due to the internal  1µA Battery Reverse Current
MOSFET architecture. Thermal feedback regulates  Protection of Reverse Connection of Battery
the charge current to limit the die temperature during  No MOSFET, Sense Resistor or Blocking Diode
high power operation or high ambient temperature. Required
The charge voltage is fixed at 4.2V, and the charge  Constant-Current/Constant-Voltage Operation
current can be ISET programmed externally with a with Thermal Regulation to Maximize Charge
single resistor. Rate Without Risk of Overheating
 SOT23-6 Package
The LP4067 automatically terminates the charge cycle
 RoHS Compliant and 100% Lead (Pb)-Free
when the charge current drops to 1/10 setting current
value after the final float voltage is reached.

When the input supply is removed, the LP4067

Applications
automatically enters a low current state, dropping the  Portable Media Players/Game
battery drain current to less than 1µA.  Power Bank
 Bluetooth Applications
Other features include charge current monitor, under
 PDA/MID
voltage lockout, automatic recharge and a status pin.

Marking Information
Order Information
Device Marking Package Shipping
LP4067
LP4067
F: Pb-Free LP4067AB6F SOT23-6 3K/REEL
YWX
Package Type LP4067
B6: SOT23-6 LP4067TB6F SOT23-6 3K/REEL
TYWX
Function Class Marking indication:
A: Enable Y:Production year W:Production week X: Series Number
T:Temperature senses

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 Preliminary Datasheet LP4067

Functional Pin Description

Pin Configurations
Package Type
LP4067AB6F LP4067TB6F

EN 1 6 ISET TS 1 6 ISET

SOT23-6 GND 2 5 BAT GND 2 5 CHRG

CHRG 3 4 VIN VIN 3 4 BAT

Pin Description
No.
NAME DESCRIPTION
LP4067A LP4067T
EN 1 Charge Enable Input (active low).
TS 1 Temperature senses voltage input.
GND 2 2 GND is the connection to system ground.
Open-Drain Charge Status Output. When the battery is charging, the CHRG
CHRG 3 5 pin is pulled low by an internal NMOS. When the charge cycle is completed,
the pin could be pulled High by an external pull high resistor.
VIN 4 3 VIN is the input power source. Connect to a wall adapter.
BAT is the connection to the battery. Typically a 10µF Tantalum capacitor is
BAT 5 4 needed for stability when there is no battery attached. When a battery is
attached, only a 1uF ceramic capacitor is required.
Charge Current Program. The charge current is programmed by connecting a

ISET 6 6 1% resistor(RISET) to ground.

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 Preliminary Datasheet LP4067

Typical Application Circuit

LP4067A
VIN VBAT
4 5
VIN BAT
CIN CBAT
10uF OFF EN LED1 1KΩ
10uF
1 3
ON EN CHRG
Battery

6 2
ISET GND
RISET
5.1KΩ

LP4067T
VIN
3 4
VIN BAT
CIN CBAT
1KΩ
10uF 10uF
6 5
ISET CHRG
LED1
RISET
5.1KΩ
2 1 Battery
GND TS

R1 R2

VIN

Function Block Diagram

VIN BAT

EN

TS

Control
Logic
CHRG

GND

ISET

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 Preliminary Datasheet LP4067

Absolute Maximum Ratings Note 1

 Input Voltage to GND ---------------------------------------------------------------------------------------- -0.3V to 30V
 BAT Voltage GND ---------------------------------------------------------------------------------------------- - 5V to 20V
 Other pin to GND -------------------------------------------------------------------------------------------- -0.3V to 6.5V
 Maximum Junction Temperature ---------------------------------------------------------------------------------- 125℃
 Maximum Soldering Temperature (at leads, 10 sec) --------------------------------------------------------- 260℃
 Operating Junction Temperature Range (TJ) -------------------------------------------------------- -20℃ to 85℃
 Storage Temperature ------------------------------------------------------------------------------------- -65℃ to 165℃

Thermal Information
 Maximum Power Dissipation ( PD,TA=25°C) --------------------------------------------------------------------- 0.6W
 Thermal Resistance (θJA) ---------------------------------------------------------------------------------------- 200℃/W

ESD Susceptibility
 HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV
 MM(Machine Mode) ---------------------------------------------------------------------------------------------------- 200V
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.

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 Preliminary Datasheet LP4067

Electrical Characteristics
(TA=25°C, VIN =5V, unless otherwise noted.)

SYMBOL PARAMETER CONDITIONS MIN TYP. MAX UNITS

VIN Input Voltage 4.5 5 5.8 V

IIN Input Supply Current IBAT=4.2V 40 uA

VFLOAT Regulated Output (Float) Voltage IBAT=40mA, 4.158 4.2 4.242 V

VUV VIN Under Voltage Lockout Threshold From VIN Low to High 3.3 V

VUV_HYS VIN Under Voltage Lockout Hysteresis 150 mV

VOVP Input Voltage OVP VIN Rising 6.3 V

VOVP_HYS OVP Hysteresis 400 mV

RISET=3.4k, Current Mode 515 mA

RISET=17.5k, Current Mode 100 mA

IBAT BAT Pin Current
VBAT=4.2V 1
uA
VIN=float or 0V 1

ITRIKL Trickle Charge Current VBAT<VTRIKL，RISET=10k, Current Mode 10 %IBAT

VTRIKL Trickle Charge Threshold Voltage VBAT Rising 2.6 V

VTRHYS Trickle Charge Hysteresis Voltage 150 mV

ITERM Termination Current Threshold 10 %IBAT

VISET ISET Pin Voltage RISET=10k, Current Mode 1 V

ICHRG CHRG Pin Weak Pull-Down Current VCHRG=5V 5 uA

VCHRG CHRG Pin Output Low Voltage ICHRG=5mA 0.5 V

VEN_L EN Logic-Low Voltage Threshold 0.4 V

LP4067AB6F
VEN_H EN Logic-High Voltage Threshold 1.4 V

VTS-L Threshold Voltage of VTS falling 30 %VIN

LP4067TB6F
VTS-H Threshold Voltage of VTS rising 60 %VIN

ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT-VRECHRG 150 mV

TLIM Junction Temperature in Constant Temperature Mode 125 °C

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 Preliminary Datasheet LP4067

Application Information
Input Voltage Range Automatic Recharge

The LP4067 has built-in input voltage surge protection as high Once the charge cycle is terminated, the LP4067 continuously
as 30V. The charger IC will be automatically disabled when monitors the voltage on the BAT pin. A charge cycle restarts
the input voltage is lower than 3.3V or higher than 6.3V. when the battery voltage falls below 4.05V (which
corresponds to approximately 80% to 90% battery capacity).
A charge cycle begins when the voltage at the VIN pin rises
This ensures that the battery is kept at or near a fully charged
above the 4.5V level, when a battery is connected to the
condition and eliminates the need for periodic charge cycle
charger output. If the BAT pin is less than 2.6V, the charger
initiations.
enters trickle charge mode. In this mode, the LP4067 supplies
approximately 1/10 the ISET programmed charge current to Enable Function
bring the battery voltage up to a safe level for full current
The LP4067A features an enable/disable function. An input
charging. When the BAT pin voltage rises above 2.6V, the
“Low” signal at EN pin or if this pin is floating will enable the IC.
charger enters constant-current mode(CC), where the ISET
To assure the charger will switch on, the EN turn on control
programmed charge current is supplied to the battery. When
level must below 0.4 volts. The charger IC will go into the
the BAT pin approaches the final float voltage, the LP4067
shutdown mode when the voltage on the EN pin is greater
enters constant-voltage mode(CV) and the charge current
than 1.4 volts. If the enable function is not needed in a specific
begins to decrease, and the battery full indication is set when
application, it may be tied to GND or floating to keep the
the charge current in the CV mode is reduced to the
charge IC in a continuously on state.
programmed full battery current (1/10).
Charge Status Indicator(CHRG)
Charge Termination
After application of a 5V source, the input voltage rises above
A charge cycle is terminated when the charge current falls to
the UVLO and sleep thresholds (VIN>VBAT+VDT), but is less
1/10th the ISET programmed value after the final float voltage
than OVP (VIN<VOVP), then the PG turns on and provides a
is reached. This condition is detected by using an internal,
low impedance path to ground.
filtered comparator to monitor the ISET pin. When the ISET
pin voltage falls below 100mV for longer than tTERM(typically CHRG has two different states: strong pull-down (~5mA) and
1ms), charging is terminated. high impedance. The strong pull-down state indicates that the
LP4067A is in a charge cycle. When the charger is entered
ISET programming Charge Current
CV mode and once the charge current has reduced to the
The charge current (IBAT) is set by a resistor (RISET) battery full charge current threshold (ITERM), the CHRG pin will
connecting from the ISET pin to GND. The relationship of the become high impedance.
charge current and the programming resistance is established
Function CHRG
by the following equations（VISET=1V）.
Charging Low
Charge Finish High

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 Preliminary Datasheet LP4067

Battery Temperature Detection

Where RTL is the low temperature resistance and RTH
The LP4067T continuously monitors temperature by
is the high temperature resistance of thermistor, as
measuring the voltage between the TS and GND
specified by the thermistor manufacturer. R1 or R2
pins. A negative or a positive temperature coefficient
can be omitted if only one temperature (low or high)
thermistor (NTC, PTC) and an external voltage
setting is required. Applying a voltage between the
divider typically develop this voltage. The LP4067T
VTS-L and VTS-H thresholds to pin TS disables the
compares this voltage against its internal VTS-L and
temperature-sensing feature.
VTS-H thresholds to determine if charging is allowed.
The temperature sensing circuit is immune to any Thermal Limiting
fluctuation in VIN, since both the external voltage An internal thermal feedback loop reduces the ISET
divider and the internal thresholds (VTS-L and VTS-H) programmed charge current if the die temperature attempts to
are referenced to VIN. rise above a preset value of approximately 125°C. This
feature protects the LP4067 from excessive temperature and
The resistor values of R1 and R2 are calculated by
allows the user to push the limits of the power handling
the following equations: capability of a given circuit board without risk of damaging the
LP4067. The charge current can be set according to typical
For NTC Thermistors:
(not worst-case) ambient temperature with the assurance that
( )
the charger will automatically reduce the current in worst-case
( )
conditions.
( )
( ) ( )

For PTC Thermistors:

( )
( )
( )
( ) ( )

K1(VTS-L)=30%, K2(VTS-H)=60%.

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 Preliminary Datasheet LP4067

Packaging Information
SOT23-6

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