XT2058

Single Li-ion Battery Charger With Thermal Regulation

■ General Description ■ Features

The XT2058 is a complete constant-current /constant  Programmable charge current up to 800mA
-voltage linear charger for single cell Li-ion battery. Its Thin  No MOSFET,sense resistor or blocking diode
SOP package and low external component count make the required
XT2058 ideally suited for portable applications.  Complete linear charger in thinSOP package for
No external sense resistor is needed, and no blocking single cell Li-ion battery
diode is required due to the internal MOSFET architecture.  Constant-current/constant-voltage operation with
Thermal feedback regulates the charge current to limit the thermal regulation to maximize charge rate without
die temperature during high power operation or high risk of overheating
ambient temperature. The charge voltage is fixed at 4.2V,  Preset 4.2V charge voltage
and the charge current can be programmed externally with  Voltage accuracy of ± 1%
a single resistor. The XT2058 automatically terminates the  Charge current monitor output for gas gauging
th
charge cycle when the charge current drops to 1/10 the  Automatic recharge
programmed value after the final float voltage is reached.  Charge status output pin
When the input supply is removed, the XT2058  6.8V input over-voltage protection
automatically enters a low current state, dropping the  C/10 charge termination
battery drain current to less than 0.1µA.  25µA supply current in shutdown
Other features include charge current monitor,  2.9V trickle charge threshold
under-voltage lockout, automatic recharge and a status pin  Soft-start limits inrush current
to indicate charge termination and the presence of an input
■ Package
voltage.
 SOP-8
■ Applications
 Charger
 Cellular phone
 Digital products

■ Ordering Information
XT2058 ①②③

Designator Description Symbol Description

X Without trickle charge
① Type
Y With trickle charge
④ Packaging Types M SOP-8
R Embossed tape: Standard feed
⑤ Device Orientation
L Embossed tape: Reverse feed

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■ Pin Assignment

Pin Number Pin Name

NC 1 8 BAT
1 NC
PROG 2 7 VDD 2 PROG
3 CHRG
CHRG 3 6 NC
4 DONE
DONE 4 5 GND 5 GND
6 NC
SOP-8
7 VDD
8 BAT

■ Pin Function
NC(Pin 1/6): Not connect.

PROG (Pin 2): Charge current program, charge current monitor and shutdown pin. The charge current is programmed by
connecting a 1% resistor, RPROG 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 :
IBAT = (VPROG/RPROG)×1000
The PROG pin can also be used to shutdown the charger. Disconnecting the program resistor from ground allows a 3µA
current to pull the PROG pin high.

CHRG (Pin 3): CMOS charge status output. When the battery is charging, the CHRG pin is high. When the charge cycle
is completed or other abnormal situation occurs, the CHRG is set in high impedance state.

DONE (Pin 4): Full indication output. When fully charged, DONE port is placed in high position. In the charging process or
other abnormal situation occurs, theDONE is set in high impedance state.

GND (Pin 5): Ground.

VDD (Pin 7): Positive input supply voltage. Provides power to the charger. VCC can range from3.8V to 6.8V and should
be bypassed with at least a 1µF capacitor.

BAT (Pin 8): Charge current output. Provides charge current to the battery and regulates the final float voltage to 4.2V.

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■ Marking Rule
 SOP-8

XT2058YSR
XXXXXX
XXXXXX

SOP-8

Note: The first row of the product name, the second and third rows of the internal regulations of the lot number, wafer number
and the internal product characteristics, and other information.

■ Typical Application Circuit

 Basic circuit

1 NC BAT 8
Rprog
2 PROG VDD 7
4.7uF

3 CHRG NC 6
Cin Cout

4 DONE GND 5

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■ Absolute Maximum Ratings
Parameter Symbol Maximum Rating Unit
Input Supply Voltage Vcc VSS-0.3～VSS+10
PROG pin Voltage Vprog VSS-0.3～Vcc+0.3
V
BAT pin Voltage Vbat Vss-0.3～7
CHAG、DONE pin Voltage Vchrg,Vdone VSS-0.3～VSS+10
Power Dissipation PD SOP-8 800 mW
BAT pin Current Ibat 800 mA
Operating Ambient Temperature Topa -40～+85
°C
Storage Temperature Tstr -65～+125

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.

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■ Block Diagram

VDD

1X 1000X
120°C
TA BAT

+
-
TDIC
MA
R1

+
VA
- R2

+
VDD

- OVP CA
+
-

6.8V REF
1.22V

-
SHDW C1
R3

DONE
+
STDBY 1V

+
R4 VA
0.1V -
+
C2
CHRG - R5

STANDBY 3uA
TO
BAT VDD
+
C3 2.9V
-
PROG GND

PROG

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■ Electrical Characteristics
(TA=25℃ unless otherwise noted)
Parameter Symbol Condition Min Typ Max Unit
Input supply voltage Vcc 3.8 6.0 V
Input overvoltage VOVP 6.8 V
Overvoltage release Vdp 6.5 V
Charge mode,Rprog=10K 300 2000 µA
Input supply current Icc Standby mode 200 500 µA
Shutdown mode 25 50 µA
Regulated Output Voltage Vfloat 0℃<TA<85℃, IBAT = 40mA 4.158 4.2 4.242 V
Rprog=10K,Current mode 93 100 107 mA
Rprog=2K,Current mode 465 500 535 mA
BAT pin Current Ibat Standby mode,Vbat=4.2V 0 -2.5 -6 µA
Shutdown mode 1 2 µA
Sleep mode,Vcc=0V 1 2 µA
Trickle charge current Itrikl Vbat<Vtrikl,Rprog=2k 20 50 70 mA
Trickle charge Threshold Voltage Vtrikl Rprog=10K，Vbat Rising 2.8 2.9 3.0 V
Trickle voltage hysteresis voltage Vtrhys Rporg=10k 60 80 110 mV
Vcc Undervoltage lockout
Vuv From Vcc low to high 3.8 V
Threshold
Vcc undervoltage lockout
Vuvhys 70 100 150 mV
hysteresis

Manual shutdown threshold PROG pin rising 1.15 1.21 1.30 V

Vmsd
voltage PROG pin falling 0.9 1.0 1.1 V

Vcc-Vbat Lockout Threshold Vcc from low to high 70 100 140 mV

Vasd
voltage Vcc from high to low 5 30 50 mV

C/10 Termination Current Rprog=10k 0.085 0.10 0.115 mA/mA

Iterm
Threshold Rprog=2k 0.085 0.10 0.115 mA/mA
PROG pin Voltage Vprog Rprog=10k, Current mode 0.93 1.0 1.07 V
Recharge Battery threshold
ΔVrecg VFLOAT - VRECHRG 100 200 mV
Voltage

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■ Application Information
 Charge current design
XT2058 charge current is set by an external resistor. ICHRG = 1000/RPROG, If RPROG=2K, the charging current is 500mA.

 Status Indication
XT2058 has 2 LEDs for status indication. The following table indicates the corresponding relationship for the state:

Pin Name Charge Mode Charge Full, Not Connect Protection

CHRG Light Off Off
DONE Off Light Off

■ Typical Performance Characteristics

 CC/CV charging characteristic

 Self current consumption

 Reverse current

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■ Package Information
 SOP-8

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