G5242
Description
hurricane sandyG5242 is a complete constant-current & constant voltage linear charger for single cell lithium-ion and Lithium-Polymer batteries. Its SOT-23 package and low external component count make G5242 ideally suited for portable applications. Furthermore, the G5242 is specifically designed to work within USB power specification. At the same time, G5242 can also
be ud in the standalone lithium-ion and Lithium-polymer battery charger.
No external n resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. 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 G5242 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is removed, the G5242 automatically enters a low current stage, dropping the battery drain current to less than 2uA. The G5242 can
be put into shutdown mode, reducing the supply current to 25uA.
青岛英语Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the prence of an input voltage .
18youngchinagirls国¾Programmable Charge Current Up to 500mA. ¾No MOSFET, Sen Resistor or Blocking Diode Required.
¾ Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge
Rate without Risk of Overheating.
¾Charges Single Cell Li-Ion Batteries Directly from USB Port.
¾Pret 4.2V Charge Voltage with ±1%
Accuracy.
¾25uA Supply Current in Shutdown.
¾ 2.9V Trickle Charge Threshold
¾Available Without Trickle Charge.
¾Soft-Start Limits Inrush Current.
¾Available in 5-Lead SOT-23 Package.
Pin Configuration Application
¾Cellular Telephones, PDA’s, MP3 Players. ¾Charging Docks and Cradles
¾ Bluetooth
Applications
Application Diagram
Single
Li-Ion
Cell
500mA Li-Ion Battery Charger SOT23-5
V
V
DD
STAT
Absolute Maximum Rating (1)
Parameter Symbol Value
Units Input Supply Voltage V CC 10 V
PROG Voltage V PROG VCC+0.3 V
BAT Voltage V BAT 7 V
CHRG Voltage V CHRG 10 Vwof
BAT Short-Circuit Duration Continuous
Thermal Resistance, Junction-to-Ambient ĬJA 250
fastback
(SOT-23-5)
°C/W
BAT Pin Current I BAT 800 mA
PROG Pin Current I PROG 800 P A
Maximum Junction Temperature T J 125 °C
Storage Temperature T S-65 to +125 °C
Lead Temperature (Soldering, 10 c) 300 °C
Operating Rating (2)
Parameter Symbol
Value
Units
Supply Input Voltage V IN-0.3 to +10 V
Junction Temperature T J-40 to +85 °C
Electrical Characteristics
V IN = 5V; T J = 25°C; unless otherwi specified.
Symbol Parameter Conditions Min
Typ
Max Unit
V CC Input Supply Voltage 4.25 6 V
Charge Mode(3), R PROG = 10k 110 500 μA
Standby Mode (Charge Terminated)115 160 μA
I CC Input Supply Current
Shutdown Mode(R PROG Not Connected, V CC < V BAT, or V CC < V UV) 20 40
μA
V FLOAT Regulated Output (Float) Voltage I BAT = 30mA, I CHRG = 5mA 4.158 4.2 4.242V
R PROG = 10k, Current Mode 90 110 130 mA
R PROG = 2k, Current Mode 500 mA
Standby Mode, VBAT = 4.2V 0 +/-1 +/-5
μA
Shutdown Mode (R PROG Not Connected) ʳ +/-0.5 +/-5 μA
I BAT BAT Pin Current
Sleep Mode, V CC = 0V ʳ +/-1 +/-5 μA
I TRIKL Trickle
Charge
Current V BAT < V TRIKL, R PROG = 10k 12 18 25 mA
V TRIKL Trickle Charge Threshold Voltage R PROG = 10k, V BAT Rising 2.8 2.9 3.0 V
G5242
Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The device is not guaranteed to function outside its operating rating.
Note 3: Supply current includes PROG pin current (approximately 100μA) but does not include any current delivered to the battery through the BAT pin (approximately 100mA).
Note 4: I TERM is expresd as a fraction of measured full charge current with indicated PROG resistor.
Electrical Characteristics (Continued)
V IN = 5V; T J = 25°C; unless otherwi specified
Symbol Parameter Conditions Min Typ Max Unit
V UV V CC Undervoltage Lockout Threshold From V CC Low to High
3.4 V V UVHYS V CC Undervoltage Lockout Hysteresis
170 mV PROG Pin Rising 1.25 V V MSD Manual Shutdown Threshold Voltage
PROG Pin Falling
1.2 V V CC from Low to High 100 mV V ASD
V CC – V BAT Lockout Threshold Voltage
V CC from High to Low
30
mV
R PROG = 10k (4) 0.1 mA/mA I TERM C/10 Termination Current Threshold
R PROG = 2k
0.1 mA/mA V PROG PROG Pin Voltage
R PROG = 10k, Current Mode 0.9 1.03 1.1 V I CHRG CHRG Pin Weak Pull-Down Current V CHRG = 5V 8 20 40 μA V CHRG CHRG Pin Output Low Voltage I CHRG = 5mA
0.35
0.8
V
ocam
ÿV RECHRG Recharge Battery Threshold Voltage V FLOAT - V RECHRG 100 mV T LIM
Thermal Protection Temperature
120
°C
t SS Soft-Start Time I BAT = 0 to 1000V/R PROG 100 μs t RECHARGE Recharge Comparator Filter Time V BAT High to Low
2
ms t TERM Termination Comparator Filter Time I BAT Falling Below I CHG /10 1000 μs I PROG
PROG Pin Pull-Up Current
1
μA
G5242
Float Voltage vs Supply Voltage
4.185
4.1904.1954.2004.2054.2104.2154.2204.2254.2304.0
4.5
5.0 5.5
6.0
6.5
V CC (V)
V B A T (V )
R PROG =10k T A =25ć
Charge Current vs Supply Voltage
0100200300400500600
4.0
4.5
5.0
5.5
6.0 6.5
7.0
V CC (V)
I B A T (m A )
马来西亚失联飞机R PROG =2k
R PROG =10k V BAT =4V T A =25ć
ONSET OF THERMAL REGULATION
Trickle Charge Current vs Supply Voltage
0102030405060704.0
4.5
5.0
5.5
6.0 6.5
7.0
V CC (V)
I T R I K L (m A )
R PROG =2k
V BAT =2.5V T A =25ć
R PROG
=10k
Float Voltage vs Temperature
4.185
l2954.1904.1954.2004.2054.2104.215
2040
6080100120
Temperature (ć)
V F L O A T (V )
G5242
current are calculated using the following equations:
PROG
CHG CHG PROG R V
校长竞聘演讲稿I I V R 1100,1100
,The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage using the following equation:
1100x
PROG
PROG
BAT R V I Operation
TheG5242 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%. TheG5242includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current n resistor is required; thus, the
basic charger circuit requires only two external components. Furthermore, the G5242 is capable of operating from a USB power source.
Normal Charge Cycle
A charge cycle begins when the voltage at the VCC pin ris above the UVLO threshold level 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 2.8V, the charger enters trickle charge mode. In this mode, theG5242 supplies approximately 1/10 the
programmed charge current to bring the battery voltage up to a safe level for full current charging.
元音字母
When the BAT pin voltage ris above 2.8V, 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 G5242 enters constant-voltage mode and the charge current begins to decrea. When the charge current drops to 1/10 of the programmed value, the charge cycle ends.
Programming Charge Current
The charge current is programmed using a single resistor from the PROG pin to ground. The battery charge current is 1100 times the current out of the PROG pin. The program resistor and the charge
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 the PROG pin voltage falls below 100mV for longer than t TERM (typically 1ms), charging is terminated. The charge current is latched off and the G5242 enters standby mode, where the input supply current drops to 200mA. (Note: C/10 termination is disabled in trickle charging and thermal
limiting modes). When charging, transient loads on the BAT pin can
cau 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. The 1ms filter time (t TERM ) 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 1/10th the programmed value, the G5242 terminates the charge cycle and ceas to provide any current through the BAT pin. In this state, all loads on the
BAT pin must be supplied by the battery.
The G5242 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4.05V recharge threshold (V RECHRG ), another charge cycle begins and current is once again supplied to the
G5242
