w w w .h x s e m i .c o m
F e a t u r e s
Programmable Charge Current Up to
700mA
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
Preset 4.2V Charge Voltage with 1%
Accuracy
Automatic Recharge
2.9V Trickle Charge Threshold    Available in 5-Lead SOT-23 Package
A p p l i c a t i o n s
Charger for Li-Ion Coin Cell Batteries  Portable MP3 Players, Wireless Headsets  Bluetooth Applications  Multifunction Wristwatches
D e s c r i p t i o n
The
HX6001
is
a
complete
constant-current/constant voltage linear charger for single cell lithium-ion batteries. Its package and low external component count make the HX6001 ideally suited for portable applications. Furthermore, the HX6001 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 MOSFET architecture. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The HX6001 automatically terminates the charge cycle when the charge current drops to 1/10th  the programmed value after the final float voltage is reached.
The HX6001 converters are available in the industry standard SOT-23-5L power packages (or upon request).
O r d e r  I n f o r m a t i o n
HX6001 - ① ②：
SYMBOL DESCRIPTION
① Denotes Output voltage: N: 4.2V
②
Denotes Package Types: E: SOT-23-5L
T y p i c a l A p p l i c a t i o n C i r c u i t
* I BAT = (V PROG/R SET)*900
* When charging in constant-current mode, the V PROG is usually 1V.
P i n A s s i g n m e n t
PIN
NUMBER
SOT-23- 5L
PIN NAME FUNCTION
1 CHRG Open-Drain Charge Status Output
2 GND Ground
3 BAT Charge Current Output
4 V CC Positive Input Supply Voltage.float up
5 PROG Charge Current Program DC+
A b s o l u t e M a x i m u m R a t i n g s(N o t e1)
Input Supply Voltage (V CC) ........................................................................................ –0.3V to 7V  – 0.3V to V CC+ 0.3V  BAT ......................................................................................................................... –0.3V to 7V  –0.3V to 7V  BAT Pin Current ..................................................................................................................... 800mA  Maximum Junction Temperature .............................................................................................. 125℃ Operating Am
bient Temperature Range (Note 2)........................................................ –40℃to 85℃ Storage Temperature Range …………………………………………….................. –65 ℃to 125℃ Lead Temperature (Soldering, 10 sec)..................................................................................... 300℃Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.
Note 2: The HX6001 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the
–40°C to 85°C operating temperature range are assur ed by design, characterization and correlation with statistical process controls.
P i n D e s c r i p t i o n
CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed or reverse battery lockout / No AC is detected, CHRG is forced high impedance.
GND (Pin 2): Ground.
BAT (Pin 3): Charge Current Output. It should be bypassed with at least a 1uF capacitor. It Provides ch
arge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode.
V CC (Pin 4): Positive Input Supply Voltage. It Provides power to the charger V CC can range from 4.5V to 6.5V and should be bypassed with at least a 1uF capacitor.
PROG (Pin 5): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, R PROG, to ground. When charging in constant-current 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 SET)*900.
E l e c t r i c a l  C h a r a c t e r i s t i c s
Operating Conditions: T A =25, ℃V CC =5V unless otherwise specified.
SYMBOL PARAMETER CONDITIONS
MIN TYP MAX UNITS V CC
Input Supply Voltage
4.5
5.0
6.5
V
Standby Mode (Charge Terminated) l
48
µA
I CC
Input Supply Current
Shutdown Mode (R PROG  Not Connected, V CC  < V BAT )
80
µA
V FLOAT
Regulated Output (Float) Voltage
0℃≤T A ≤85℃
4.15    4.2    4.24 V R PROG  = 10k, Current Mode  90  mA R PROG  = 2k, Current Mode
450  mA
Standby Mode, V BAT  = 4.2V  7  µA Shutdown Mode (R PROG  Not Connected)
13    µA
I BAT
BAT Pin Current
Sleep Mode, V CC  = 0V
0.1  µA I TRIKL  Trickle Charge Current R PROG  = 2k
45  mA V TRIKL  Trickle Charge Threshold Voltage R PROG  = 10k, V BAT  Rising      2.9  V I TERM
C/10 Termination Current Threshold R PROG  = 2k
45
mA
V PROG  PROG Pin Voltage R PROG  = 2k, Current Mode    1  V
∆V RECHRG  Recharge Battery Threshold Voltage V FLOAT  - V RECHRG
250  mV R ON
Power FET “ON” Resistance  (Between V CC  and BAT)
660
m Ω
A p p l i c a t i o n I n f o r m a t i o n
The HX6001 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of ±1%. The HX6001 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only two external components. Furthermore, the HX6001 is capable of operating from a USB power source.
Normal Charge Cycle
A charge cycle begins when the voltage at the V CC pin rises above 4.5V and a 1% program resistor is connected from the PROG pin to ground or when a battery is connected to the charger output. If the BAT pin is less than 2.9V, the charger enters trickle charge mode.
In this mode, the HX6001 supplies approximately 1/10 the programmed 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 programmed charge current is supplied to the battery. When the BAT pin approaches the final float voltage (4.2V), the HX6001 enters constant-voltage mode and the charge current begins to decrease. When the charge current drops to 1/10 of the programmed value, the charge cycle ends.
Charge Termination
A charge cycle is terminated when the charge current falls to 1/10th 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 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 1/10th the programmed value. Once the average charge current drops below 1/10th the programmed value, the HX6001 terminates 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.
The HX6001 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4V recharge threshold (V RECHRG), 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.
Thermal Limiting
An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts to rise above a preset value of approximately 120°C. This feature protects the HX6001 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 the HX6001. The charge current can be set according to typical (not worst-case) ambient temperature with the assurance that the charger will automatically reduce the current in worst-case conditions. ThinSOT power considerations are discussed further in the Applications Information section.

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