POWER LP28021A 1.0a single-chip li-ion and li-pol charger with ovp protection Datasheet

Preliminary Datasheet
LP28021
1.0A Single-chip Li-ion and Li-POL Charger
with OVP Protection
General Description
Features
The LP28021/A is a complete constant-current/ constant

Very Low Power Dissipation
voltage linear charger for single cell lithium-ion batteries. Its

Input Voltage: 3.8V~36V

Input OVP: 6.1V

Protection of Reverse Connection of Battery
to the internal MOSFET architecture. Thermal feedback

Programmable Charge Current Up to 1000mA
regulates the charge current to limit the die temperature during

No MOSFET, Sense Resistor or Blocking Diode Required
high power operation or high ambient temperature. The charge

Constant-Current/Constant-Voltage Operation with
Thermal Regulation to Maximize Charge Rate Without
Risk of Overheating
automatically terminates the charge cycle when the charge

1µA Leakage Current in Shutdown
current drops to 1/10th the RIBAT rammed value after the final

Drainage Charge Current Thermal Regulation Status
Outputs for LED or System Interface

Indicates Charge and Fault Conditions

Consumption Available in TDFN-10 Package

RoHS Compliant and 100% Lead (Pb)-Free
TDFN-10 package and low external component count make the
LP28021/A ideally suited for portable applications. No external
sense resistor is needed, and no blocking diode is required due
voltage is fixed at 4.2V/4.35V, and the charge current can be
rammed externally with a single resistor(RIBAT). The LP28021
float voltage is reached. When the input supply is removed, the
LP28021/A automatically enters a low current state, dropping
the battery drain current to less than 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.
Order Information
LP28021 □ □□ □ □□
BAT Voltage
Default: 4.2V
Applications

Portable Media Players/Game

Power Bank

PDA/MID

Bluetooth Applications
43: 4.35V
F: Pb-Free
Package Type
QV: TDFN-10
Marking Information
Device
Marking
Package
Shipping
LP28021
LPS
QV:TDFN-10
3K/REEL
LP28021
SP:ESOP8
2.5K/REEL
QV:TDFN-10
3K/REEL
SP: ESOP8
YWX
LP28021A
Function Class
LP28021A
Default:OCP Adjustable
A:Enable
LPS
YWX
Marking indication:
Y:Production year W:Production week
LP28021-04
Apr.-2017
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X: Series Number
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Page 1 of 11
Preliminary Datasheet
LP28021
Typical Application Circuit
LP28021
VIN
VIN
VO
CIN
1uF
Battery
OV
VBAT
2K
CHRG
CBAT
10uF
LED1
STDBY
LED2
ISET
ILIMIT
RLIMIT
RIBAT
GND
LP28021A
VIN
VIN
VO
CIN
1uF
OV
OFF
CHRG
EN
ON
2K
LED1
STDBY
Battery
LED2
ISET
VBAT
CBAT
10uF
RIBAT
GND
Functional Pin Description
Package Type
Pin Configurations
ESOP8 / TDFN-10
(LP28021)
ILIMIT
1
BAT
2
STDBY
3
CHRG
4
GND
9
8
VIN
7
VO
GND 1
ILIMIT 2
BAT 3
6 GND
5 ISET
8 VO
7 GND
CHRG 5
6 ISET
TDFN-10
GND 1
10 VIN
EN 2
BAT 3
(LP28021A)
9 OV
11
GND
STDBY 4
ESOP8
TDFN-10
10 VIN
9 OV
11
GND
8 VO
STDBY 4
7 GND
CHRG 5
6 ISET
TDFN-10
LP28021-04
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Page 2 of 11
Preliminary Datasheet
LP28021
Pin Description
Pin
LP28021
LP28021A
Name
Description
GND is the connection to system ground.
ESOP8
TDFN-10
TDFN-10
6,9
1,7,11
1,7,11
GND
2
ILIMIT
1
2
2
3
3
Input Current limit Program Pin. The input current from VIN to OV is
programmed by connecting a 1% resistor(RLIMIT)to ground.
/EN
Chip enable pin. Active low
BAT
BAT is the connection to the battery.
Open-Drain Charge Status Output. When the battery is charging, this
3
4
4
STDBY
STDBY pin is pulled High by an internal N-channel MOSFET. When the
charge cycle is completed, the pin is pulled Low.
Open-Drain Charge Status Output. When the battery is charging, this
4
5
5
CHRG
CHRG pin is pulled low by an internal N-channel MOSFET. When the
charge cycle is completed, the pin is pulled High.
5
6
6
ISET
7
8
8
VO
9
9
OV
10
10
VIN
8
LP28021-04
Apr.-2017
Charge Current Program, Charge Current Monitor and Shutdown Pin.
Input of Charger. Connect a capacitor 10uF to ground.
Output of Over Voltage Protection part. Connect a capacitor 10uF to
ground.
VIN is the input power source with Over Voltage Protection part. Connect
to a wall adapter.
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Page 3 of 11
Preliminary Datasheet
LP28021
Function Diagram
OV
VIN
Charge pump
OCP
ILIMIT
Control Logic
EN
Vref
VO
OTP
1X
1200X
145℃
TDIE
NC
TA
-
+
MA
BAT
5μA
TTEMP
R1
CA
- +
TTEMP
VA
45%VIN
C1
SHDN
+
-
+
R3
CHRG
REF
1.22V
1V
R2
R4
C2
STDBY
C3
+
-
+
0.1V
-
R5
TO BAT
2.9V
VCC
3μA
ISET
LP28021-04
Apr.-2017
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GND
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Page 4 of 11
Preliminary Datasheet
LP28021
Absolute Maximum Ratings Note 1

Input Voltage to GND(VIN) ----------------------------------------------------------------------------------- -0.3V to 36V

VO, VOV Voltage to GND(VO,OV) ------------------------------------------------------------------------- -0.3V to 7V

BAT to GND ------------------------------------------------------------------------------------------------------- -5V to 8V

VO to BAT ------------------------------------------------------------------------------------------------------------------- 8V

BAT Short-Circuit Duration ----------------------------------------------------------------------------------- Continuous

BAT Pin Current ---------------------------------------------------------------------------------------------------- 1000mA

Other pin to GND ----------------------------------------------------------------------------------------------- -0.3V to 6V

Maximum Junction Temperature ---------------------------------------------------------------------------------- 150℃

Operating Ambient Temperature Range(TA) -------------------------------------------------------- -40℃ to 85℃

Storage Temperature

Maximum Soldering Temperature (at leads, 10 sec) -------------------------------------------------------- 260℃
Note 1.
--------------------------------------------------------------------------------------- -45℃ to 165℃
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℃, TDFN-10) ------------------------------------------------------- 1.5W

Maximum Power Dissipation (PD, TA=25℃, ESOP8) ----------------------------------------------------------- 2W

Thermal Resistance (JA,TDFN-10) ----------------------------------------------------------------------------- 65℃/W

Thermal Resistance (JA,ESOP8) -------------------------------------------------------------------------------- 50℃/W
ESD Susceptibility

HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV

MM(Machine Mode) --------------------------------------------------------------------------------------------------- 200V
LP28021-04
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Page 5 of 11
Preliminary Datasheet
LP28021
Electrical Characteristics
(TA=25℃. VIN=5V, unless otherwise noted.)
Symbol
VIN
VOVP
VHYS-OVP
TOVP
TON(OVP)
Parameter
Input Voltage
OVP threshold
OVP hysteresis
OVP active time
OVP recovery time
ILIMIT
Input current limit set (LP28021)
TOCP
VILIMIT
TON(OCP)
VEN(ON)
VEN(OFF)
Over current Protection detection time
ILIMIT Voltage
Over current Protection recovery time
Chip enable
Chip shutdown
IQ
Input Supply Current
VFLOAT
Regulated Output (Float) Voltage
IBAT
BAT Pin Current
ITRIKL
VTRIKL
VTRHYS
VUV
VUVHYS
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
VIN Under voltage Lockout Threshold
VIN Under voltage Lockout Hysteresis
VASD
VVO–VBAT Lockout Threshold Voltage
ITERM
C/10 Termination Current Threshold
VISET
I(CHRG/STDBY)
V(CHRG/STDBY)
ΔVRECHRG
IBAT Pin Voltage
CHRG/STDBY Pin Weak Pull-Down Current
CHRG/STDBY Pin Output Low Voltage
Recharge Battery Threshold Voltage
Junction Temperature in Constant
Temperature Mode
OTP hysteresis
Power FET “ON” Resistance
(Between VO and BAT)
TLIM
ΔTLIM
RON
LP28021-04
Apr.-2017
Condition
VIN increasing from 5~7V
VIN decreasing from 7~5V
VIN=5->10V
VIN=10->5V to output ON
RLIMIT=51K
RLIMIT=82K
RLIMIT=150K
RLIMIT=NC
(LP28021A)
Charge Mode, RIBAT=10k
Standby Mode
(Charge Terminated)
IBAT=40mA(LP28021XXX)
IBAT=40mA(LP28021XXX-43)
RIBAT=1k, Current Mode
RIBAT=2k, Current Mode
Standby Mode, VBAT=4.2V
Shutdown Mode (RIBAT NC)
Reverse Current, VBAT=-4.2V
VBAT<2.8V
RIBAT=10k, VBAT Rising
RIBAT=10k
VVO from Low to High
VVO from Low to High
VVO from High to Low
RIBAT = 10k
RIBAT = 2k
RIBAT=10k, Current Mode
V(CHRG/STDBY)= 5V
I(CHRG/STDBY)=5mA
VFLOAT-VRECHRG
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Min
3.8
5.8
Typ
5
6.1
150
Max
36
6.4
300
2000
Units
V
V
mV
μs
ms
A
A
A
A
ms
V
s
V
V
μA
200
500
μA
4.2
4.35
1000
500
-2.5
±1
-1
30
2.9
120
3.8
500
100
80
10
10
1
4.242
4.4
V
V
mA
mA
μA
μA
mA
mA
V
mV
V
mV
mV
mV
%IBAT
%IBAT
V
μA
V
mV
1
2.1
9
1.9
1.3
0.85
2.5
30
0.8
1
0.4
1.4
4.158
4.3
2.8
100
0.35
150
-6
±2
3.0
5
0.6
200
150
℃
20
℃
300
mΩ
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Page 6 of 11
Preliminary Datasheet
LP28021
Typical Operating Characteristics of OVP
Turn on waveform
VIN falling waveform
LP28021-04
Apr.-2017
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OVP waveform
OCP detection time
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Page 7 of 11
Preliminary Datasheet
LP28021
Application Information
The LP28021 is a single cell lithium-ion battery
Charge Termination
charger using a constant-current/constant-voltage
A charge cycle is terminated when the charge current falls to
algorithm. It can deliver up to 1000mA of charge
1/10th the ISET rammed value after the final float voltage is
current (using a good thermal PCB layout) with a
reached. This condition is detected by using an internal,
final float voltage accuracy of ±1%. The LP28021
filtered comparator to monitor the ISET pin. When the ISET
includes an internal P-channel power MOSFET and
pin voltage falls below 200mV for longer than tTERM(typically
thermal regulation circuitry. No blocking diode or
external current sense resistor is required; thus, the
1ms), charging is terminated. The charge current is latched off
and the LP28056S enters standby mode, where the input
supply current drops to 200µA. In this state, all loads on the
basic charger circuit requires only two external
BAT pin must be supplied by the battery. (Note: C/10
components. Furthermore, the LP28021 is capable
termination is disabled in trickle charging and thermal limiting
of operating from a USB power source.
modes).
Normal Charge Cycle
A charge cycle begins when the voltage at the VO
ISET ramming Charge Current
pin rises above the UVLO threshold level and a 1%
The charge current is IIBAT rammed using a single
resistor is connected from the ISET pin to ground or
resistor from the ISET pin to ground. The battery
when a battery is connected to the charger output. If
charge current is 1000 times the current out of the
the BAT pin is less than 2.8V, the charger enters
IIBAT pin. The IIBAT ram resistor and the charge current
trickle charge mode. In this mode, the LP28021
are calculated using the following equations:
supplies 30mA charge current to bring the battery
voltage up to a safe level for full current charging.
When the BAT pin voltage rises above 2.9V, the
charger enters constant-current mode, where the
RISET rammed charge current is supplied to the
RISET=1000V/IBAT
The charge current out of the BAT pin can be
determined at any time by monitoring the IBAT pin
voltage using the following equation:
IBAT=VISET×1000/RISET
battery. When the BAT pin approaches the final float
voltage, the LP28021 enters constant-voltage mode
IBAT= 1000V/RISET
Note: VIBAT is 1Volts.
and the charge current begins to decrease. The
charge cycle ends when the charge current drops to
1/10 of the RISET rammed value.
LP28021-04
Apr.-2017
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Page 8 of 11
Preliminary Datasheet
LP28021
Charge Status Indicator
Thermal Limiting
The charge status output has two different states:
An internal thermal feedback loop reduces the IBAT
strong pull-down (~5mA) and high impedance. The
rammed charge current if the die temperature
strong pull-down state indicates that the LP28021 is
attempts
of
in a charge cycle. Once the charge cycle has
approximately 150℃. This feature protects the
terminated, the pin state is determined by under
LP28021 from excessive temperature and allows the
voltage lockout conditions. High impedance indicates
user to push the limits of the power handling
that the LP28021 is in under voltage lockout mode:
capability of a given circuit board without risk of
either VO is less than 100mV above the BAT pin
damaging the LP28021. The charge current can be
voltage or insufficient voltage is applied to the VO pin.
set according to typical (not worst-case) ambient
A microprocessor can be used to distinguish
temperature with the assurance that the charger will
between these two states—this method is discussed
automatically reduce the current in worst-case
in the Applications Information section. When VIN
conditions.
are
rise above 6.1V(typ.), the CHRG and STDBY LEDs
discussed further in the Applications Information
would be turned off. A microprocessor can be used
section.
to distinguish between these two states.
LP28021-04
to
rise
TDFN
above
power
Apr.-2017
a
preset
value
considerations
Function
CHRG
STDBY
Charging
low
high
Charge Complete
high
low
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Page 9 of 11
Preliminary Datasheet
LP28021
Packaging Information
TDFN-10
LP28021-04
Apr.-2017
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Page 10 of 11
Preliminary Datasheet
LP28021
ESOP8
LP28021-04
Apr.-2017
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Page 11 of 11
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