Lilon battery charger
Ver01 Jul 262013
Features
Protection of battery cell reverse connection
Programmable charge current up to 800mA
No MOSFET sense resistor or blocking diode
required
Complete linear Charger for single Cell
LithiumIon Batteries
CC and CV operation with thermal regulation
to maximize Rate without risk of overheating
Preset 42V charge voltage with ±1
accuracy
Automatic Recharge
C10 charge termination
29V trickle current charge threshold
SoftStart limits inrush current
Available in SOT235 package
Applications
Cellular Telephones
Mobile Power Supply
Digital Still Cameras
MP3 Players
Bluetooth Applications
Portable Devices
USB BusPowered Chargers
GENERAL DESCRIPTION
HE4054 is a complete CCCV linear charger for
single cell lithiumion batteries it is specifically
designed to work within USB power
Specifications
No external sense resistor is needed and no
blocking diode is required due to the internal
PMOSFET architectureThermal feedback
regulates the charge current to limit the die
temperature during high power operation or high
ambient temperature The charge voltage is fixed
at 42Vand the charge current can be
programmed externally with a single resistor The
HE4054 automatically terminates the charge cycle
when the charge current drops to 110th the
programmed value after the final float voltage is
reached
When the input supply (wall adapter or USB
supply) is removed the HE4054 automatically
enters a low current state dropping the battery
drain current to less than 2μ AThe HE4054 can
be put into shut down mode reducing the supply
current to 55μ A
Other features include Battery temperature
monitor undervoltage lockout automatic
recharge and two status pins to indicate charge
and charge termination HE4054
Lilon battery charger
Ver01 2 Jul 262013
Pin Configuration
Pin Assignment
PIN Num Symbol Function
1 CHRG OpenDrain charge status output
2 GND Ground
3 BAT Battery connection Pin
4 VCC Positive input supply voltage
5 PROG Constant Charge Current Setting and Charge
Current Monitor Pin
Absolute Maximum Ratings
Parameter Rating Unit
Input supply voltage VCC 03～8 V
PROG pin voltage 03～VCC+03 V
BAT pin voltage 03～7 V
CHRG pin voltage 03～10 V
BAT pin current 800 mA
PROG pin current 800 uA
Maximum junction temperature 150 ℃
Operating ambient temperature 40～85 ℃
Storage temperature 65～125 ℃
Soldering temperature and time +260（Recommended 10S） ℃
Caution The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage These values must therefore not be exceeded under any conditions HE4054
Lilon battery charger
Ver01 3
Jul 262013
Electrical Characteristics(VIN 5V TJ 25°C unless otherwise specified)
Symbol Parameter Test Condition MAX TPY MIN Unit
Vcc Input supply voltage 40 50 80 V
ICC IBAT Static Current
Charge mode RPROG10K 150 500 uA
Standby mode(charge end) 55 100 uA
Shutdown mode RPROG not
connected VCC
VFLOAL Regulated output
voltage 0℃≤TA≤85℃ IBAT40mA 4158 42 4242 V
IBAT
BAT pin current
(The condition of
current mode is
VBAT39V)
RPROG26K current mode 525 550 575 mA
Standby mode VBAT42V 0 25 60 uA
Shutdown mode RPROG not
connected
+1
+5 uA
Sleep mode VCC0V 1 2 uA
ITRIKL Trickle charge
current VBAT
threshold voltage RPROG10K VBAT rising 28 29 30 V
VTRHYS Trickle voltage
hysteresis voltage RPROG10K 150 200 250 mV
VUV VCC under voltage
lockout threshold VCC from low to high 35 37 39 V
VUVHYS VCC under voltage
lockout hysteresis 150 200 300 mV
VASD VCCVBAT lockout
threshold voltage
VCC from low to high 100 140 180 mV
VCC from high to low 50 80 110 mV
ITERM C10 termination
current threshold RPROG26K 60 70 80 mA
VPROG PROG pin voltage RPROG10Kcurrent mode 09 10 11 V
VCHRG CHARGE Pin output
low voltage ICHRG5mA 03 06 V
RECHARGEV
Recharge battery
threshold voltage VFLOAT VRECHRG 120 180 240 mV
)(ONDSR
The resistance of
power FET ON
（between VCC and
BAT）
650 mΏ HE4054
Lilon battery charger
Ver01 4
Jul 262013
SST Softstart time IBAT0 to IBAT1300VRPROG 20 uS
RECHARGET
Recharge
comparator filter
time
VBAT from high to low 08 18 4 mS
PROGI
PROG pin pullup
current 20 uA
Description of the Principle
The HE4054 is a complete CCCV linear charger for single cell lithiumion batteries CCCV to charger
batter by internal MOSFET It can deliver up to 800mA of charge current No blocking diode or external
current sense resistor is requiredHE4054 include OpenDrain charge status Pins Charge status
indicator CHRG
The internal thermal regulation circuit reduces the programmed charge current if the die temperature
attempts to rise above a preset value of approximately 145℃ This feature protects theHE4054 from
excessive temperature and allows the user to push the limits of the power handling capability of a given
circuit board without risk of damaging theHE4054 or the external components Another benefit of
adopting thermal regulation is that charge current can be set according to typical not worstcase ambient
temperatures for a given application with the assurance that the charger will automatically reduce the
current in worstcase conditions
The charge cycle begins when the voltage at the VCC pin rises above the UVLO level a current set
resistor is connected from the PROG pin to ground The CHRG pin outputs a logic low to indicate that the
charge cycle is on going At the beginning of the charge cycle if the battery voltage is below 29V the
charge is in precharge mode to bring the cell voltage up to a safe level for charging The charger goes
into the fast charge CC mode once the voltage on the BAT pin rises above 29 V In CC mode the charge
current is set by RPROG When the battery approaches the regulation voltage 42V the charge current
begins to decrease as theHE4054 enters the CV mode When the current drops to charge termination
threshold the charge cycle is terminated and CHRG pin assumes a high impedance state to indicate that
the charge cycle is terminatedThe charge termination threshold is 10 of the current in CC mode The
charge cycle can also be automatically restarted if the BAT pin voltage falls below the recharge threshold
The onchip reference voltage error amplifier and the resistor divider provide regulation voltage with 1
accuracy which can meet the requirement of lithiumion and lithium polymer batteries When the input
voltage is not present or input voltage is below VBAT the charger goes into a sleep mode dropping
battery drain current to less than 3μ A This greatly reduces the current drain on the battery and
increases the standby time The charging profile is shown in the following figure
HE4054
Lilon battery charger
Ver01 5
Jul 262013
Programming Charge Current
The charge current is programmed using a single resistor from the PROG pin to ground The program
resistor and the charge current are calculated using the following equations
BAT
PROGIR 1450
In application according the charge current to determine RPROG the relation between RPROG and charge
current can reference the following chart
RPROG (K) IBAT (mA)
24K 60
12K 120
6K 240
4K 363
3K 483
26K 555
Charge Termination
A charge cycle is terminated when the charge current falls to 110th the programmed value after the final
float voltage is reached This condition is detected by using an internal filtered comparator to monitor the
PROG pin When the PROG pin voltage falls below 100mV for longer than tTEMP (typically 18mS)
Charging is terminated The charge current is latched off and theHE4054 enters standby mode where
the input supply current drops to 55μ A ( NoteC10 termination is disabled in trickle charging and thermal
limiting modes)
When charging transient loads on the BAT pin can cause the PROG pin to fall below 100mV for short
periods of time before the DC charge current has dropped to 110th the programmed value The 18mS
filter time (tTEMP) on the termination comparator ensures that transient loads of this nature do not result in
premature charge cycle termination Once the average charge current drops below 110th the
programmed value theHE4054 terminated the charge cycle and ceases to provide any current through
the BAT pin In this state all loads on the BAT pin must be supplied by the battery
TheHE4054 constantly monitors the BAT pin voltage in standby mode If this voltage drops below the HE4054
Lilon battery charger
Ver01 6
Jul 262013
410V recharge threshold (VRECHRG )another charge cycle begins and current is once again supplied to
the battery To manually restart a charge cycle when in standby mode the input voltage must be removed
and reapplied or the charger must be shut down and restarted using the PROG pin Figure 1 shows the
state diagram of a typical charge cycle
VBAT<29V
VBAT>29V
VBAT>29V
VBAT<41V
VBAT42V
ICHARGE<10IBAT
Fig1 State diagram of a typical charge cycle
Thermal limiting
Shutdown Mode
VDD
Trickle Mode
Charge Current TH101 IBAT
CHRGStrong pulldown
CC Charge Mode
Charge CurrentIBAT
CHRGStrong pulldown
CV Charge Mode
Charge Voltage42V
CHRGStrong pulldown
Standby Mode
No Charge Current
CHRGStrong pulldown HE4054
Lilon battery charger
Ver01 7
Jul 262013
An internal thermal feedback loop reduces the programmed charge current if the die temperature
attempts to rise above a preset value of approximately 145℃ The feature protects theHE4054 from
excessive temperature and allows the user to push the limits of the power handling capability of a given
circuit board without risk of damaging theHE4054 The charge current can be set according to typical (not
worstcase) ambient temperature with the assurance that the charger will automatically reduce the
current in worstcase conditions
Under Voltage lockout (UVLO)
An internal under voltage lockout circuit monitors the input voltage and keeps the charger in shutdown
mode until VCC rises above the under voltage lockout threshold If the UVLO comparator is tripped the
charger will not come out of shutdown mode until VCC rises 140mV above the battery voltage
Auto restart
Once charge is been terminatedHE4054 immediately use a 18ms filter time（ tRECHARGE ）on the
termination comparator to constant monitor the voltage on BAT pin If this voltage drops below the 41V
recharge threshold (about between 80 and 90 of VCC) another charge cycle begins This ensured the
battery maintained (or approach) to a charge full status and avoid the requirement of restarting the
periodic charging cycle In the recharge cycle CHRG pin enters a pulled down status
Stability Considerations
In CC mode the PROG pin is in the feedback loop not the battery The CC mode stability is affected by
the impedance at the PROG pin With no additional capacitance on the PROG pin the charger is stable
with program resistor values as high as 20K However additional capacitance on this node reduces the
maximum allowed program resistor Therefore if IPROG pin is loaded with a capacitance C the following
equation should be used to calculate the maximum resistance value for RPROG：
PROG
PROGCR 5102
1
As user may think charge current is important not instantaneous current For example to run a low
current mode switch power which parallel connected with battery the average current from BAT pin
usually importance to instantaneous current In this case In order to measure average charge current or
isolate capacitive load from IPROG pin a simple RC filter can be used on PROG pin as shown in Figure 2
In order to ensure the stability add a 10K resistor between PROG pin and filter capacitor
HE4054
Lilon battery charger
Ver01 8
Jul 262013
Fig2 Isolating with capacitive load on PROG Pin
Power Dissipation
The conditions that cause theHE4054 to reduce charge current through thermal feedback can be
approximated by considering the power dissipated in the IC Nearly all of this power dissipation is
generated by the internal MOSFETthis is calculated to be approximately
BATBATCCDIVVP )( The approximate ambient temperature at which the thermal feedback begins to
protect the IC is
JADAPCT 145 So JABATBATCCAIVVCT )(145
For example TheHE4054 with 5V supply voltage through programmable provides full limiting current
550mA to a charge lithiumion battery with 385V voltage If JA is 120℃W ( reference to PCB layout
considerations) WhenHE4054 begins to decrease the charge current the ambient temperature about
CTA 169120550)8535(145
HE4054 can work in the condition of the temperature is above 691℃ but the charge current will pull
down to below 550mA In a fixed ambient temperature the charge current is calculated to be
approximately
JABATCC
A
BAT ）V（V
TCI
145
Just as Description of the Principle part talks about so the current on PROG pin will reduce in proportion
to the reduced charge current through thermal feedback In HE4054 design applications don’t need to
considerate the worst case of thermal condition this point is importance because if the junction
temperature up to 145℃ HE4054 will auto reduce the power dissipation
Thermal Considerations
Because of the small size of the thin SOT235 package it is important to use a good thermal PC board
layout to maximize the available charge current The PC board copper is the heat sink The footprint
HE4054 HE4054
Lilon battery charger
Ver01 9
Jul 262013
copper pads should be as wide as possible and expand out to larger copper areas to spread and
dissipate the heat to the surrounding ambient Other heat sources on the
board not related to the charger must also be considered when designing a PC board layout because
they will affect overall temperature rise and the maximum charge current
VCC bypass capacitor
Many types of capacitors can be used for input bypassing however caution must be exercised when
using multilayer ceramic capacitors Because of the selfresonant and high Q characteristics of some
types of ceramic capacitors high voltage transients can be generated under some startup conditions
such as connecting the charger input to a live power source Adding a 15Ω resistor in series with a
ceramic capacitor will minimize startup voltage transients
Charging Current Soft Start
HE4054 includes a soft start circuit which used to maximize to reduce the surge current in the begging of
charge cycle When restart a new charge cycle the charging current ramps up from 0 to the full charging
current within 20μ s In the start process it can maximize to reduce the action which caused by surge
current load
Board Layout Considerations
RPROG at PROG pin should be as close toHE4054 as possible also the parasitic capacitance at PROG
pin should be kept as small as possible
The capacitance at VCC pin and BAT pin should be as close toHE4054 as possible
It is very important to use a good thermal PC board layout to maximize charging current The thermal
path for the heat generated by the IC is from the die to the copper lead frame through the package lead
(especially the ground lead) to the PC board copper the PC board copper is the heat sink The footprint
copper pads should be as wide as possible and expand out to larger copper areas to spread and
dissipate the heat to the surrounding ambient Feed through vias to inner or backside copper layers are
also useful in improving the overall thermal performance of the charger Other heat sources on the board
not related to the charger must also be considered when designing a PC board layout because they will
affect overall temperature rise and the maximum charge current
The ability to deliver maximum charge current under all conditions require that the exposed metal pad
on the back side of theHE4054 package be soldered to the PC board ground Failure to make the thermal
contact between the exposed pad on the backside of the package and the copper board will result in
larger thermal resistance
Typical Application HE4054
Lilon battery charger
Ver01 10 Jul 262013
HE4054 HE4054
Lilon battery charger
Ver01 11 Jul 262013
Package Information
5pin SOT235L Outline Dimensions
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