T echcode®
0.8A Standalone Linear Li-lon Battery Charger with Thermal Regulation
DATASHEET
TD9054
General Description
Features
The TD9054 is a complete constant‐current/constant‐voltage linear charger for single cell lithium‐ion batteries. Its SOT23‐5 package and low external component count make the TD9054 ideally suited for portable applications. Furthermore, the TD9054 can work within USB and wall adapter. No blocking diode is required due to the internal PMOSFET architecture and have prevent to negative Charge Current Circuit. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The TD9054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
TD9054 Other features include current monitor, under voltage lockout, automatic recharge and charge status pin to indicate charge termination.
Programmable Charge Current Up to 800mA No MOSFET, Sense Resistor or Blocking Diode Rquired Complete Linear Charger in SOT23‐5 Package for Single Cell Lithium‐Ion Batteries Constant‐Current/Constant‐Voltage Charges Single Cell Li‐Ion Batteries Directly from USB Port Preset 4.2V Charge Voltage with 1.5% Accuracy Automatic Recharge Charge Status Output Pins C/10 Charge Termination 2.9V Trickle Charge Threshold Soft‐Start Limits Inrush Current Available Radiator in SOT23‐5 Package, the Radiator
need connect GND or impending
Applications
Cellular Telephones, PDAs, GPS Charging Docks and Cradles Digital Still Cameras, Portable Devices USB Bus‐Powered Chargers, Chargers
Package Types
Figure 1. Package Types of TD9054
March, 20, 2013. Techcode Semiconductor Limited www.techcodesemi.com 1
T echcode®
0.8A Standalone Linear Li-lon Battery Charger with Thermal Regulation
Pin Configurations
Pin Description
CHRG 1 GND 2 BAT 3
5 PROG 4 VCC
Figure 2 Pin Configuration of TD9054(Top View)
DATASHEET
TD9054
Pin Name CHRG GND BAT
Vcc
PROG
Pin Number
When the battery is being charged, the CHRG pin is pulled low by an internal switch, 1
otherwise CHRG pin is in high impedance state. 2 GND
Connect the positive terminal of the battery to BAT pin. BAT pin draws less than 2uA 3 current in chip disable mode or in sleep mode. BAT pin provides charge current to the
battery and provides regulation voltage of 4.2V. VIN is the power supply to the internal circuit. When VIN drops to within 30mv of the 4 BAT pin voltage, TD9054 enters low power sleep mode, dropping BAT pin’s current to less than 2uA charge current is set by connecting a resistor RPROG from this pin to GND. When in precharge mode, the PROG pin’s voltage is regulated to 0.1V. When in constant charge 5 current mode, the PROG pin’s voltage is regulated to 1V. In all modes during charging, the voltage on PROG pin can be used to measure the charge current as follows: IBAT=(VPROG/RPROG)*1000‐‐‐‐(TD9054)
Ordering Information
TD9054 □ □
Circuit Type Packing:
Blank:Tube R: Tape and Reel T : SOT23-5
March, 20, 2013. Techcode Semiconductor Limited www.techcodesemi.com 2
T echcode®
0.8A Standalone Linear Li-lon Battery Charger with Thermal Regulation
Function Block Diagram
DATASHEET
TD9054
145°C Tdie
TA
80%Vin TTEMP
TTEMP 45%Vin
VCC schmitt
CA
SHDN
CHRG 1
Vcc 4
1000x 5uA MA 3 BAT
R1
R2
REF 1.22V
R3 1V R4 0.1V R5
TO BAT 3uA
2.9V 5
PROG
VCC
2 GND
March, 20, 2013. Techcode Semiconductor Limited www.techcodesemi.com 3
T echcode®
0.8A Standalone Linear Li-lon Battery Charger with Thermal Regulation
Electrical Characteristics
DATASHEET
TD9054
(VIN = 5V, TA = 25°C unless otherwise specified)
Parameters
Symbol
Input Supply Voltage
VCC
Input Supply Current
Icc
Regulated Output (Float) Voltage VFLOAL
Test Condition Charge Mode, RPROG =2k Shutdown Mode (RPROG Not Connected, VCC < VBAT, or VCC< VUV) 0℃≤TA≤85℃,IBAT=40mA
BAT Pin Current
IBAT RPROG = 2k, Current Mode RPROG = 3k, Current Mode
Standby Mode, VBAT = 4.2V
Trickle Charge Current
ITRIKL
VBAT