Linear Charger. AF4056E Datasheet

AF4056E Charger. Datasheet pdf. Equivalent

AF4056E Datasheet
Recommendation AF4056E Datasheet
Part AF4056E
Description 1.1A Lithium Ion Battery Linear Charger
Feature AF4056E; AF4056E 1.1A Lithium Ion Battery Linear Charger GENERAL DESCRIPTION AF4056E is a complete CC/CV line.
Manufacture AFSEMI
Datasheet
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AFSEMI AF4056E
AF4056E
1.1A Lithium Ion Battery Linear Charger
GENERAL DESCRIPTION
AF4056E is a complete CC/CV linear charger for single cell lithium-ion 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 P-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 AF4056E 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 AF4056E automatically enters a
low current state dropping the battery drain current to less than 2μA. The AF4056E can be put into
shutdown mode reducing the supply current to 55μA.
Other features include Battery temperature monitor, under-voltage lockout, automatic recharge and
two status pins to indicate charge and charge termination.
Features
Programmable charge current up to 1.1A
No MOSFET sense resistor or blocking diode required
Complete linear Charger for single Cell Lithium-Ion Batteries
CC and CV operation with thermal regulation to maximize Rate without risk of overheating
Preset 4.2V charge voltage with ±1% accuracy
Automatic Recharge
Two Status Indication for Charge status, no battery and battery failure indicators
C/10 charge termination
55μA supply current in shutdown
2.9V trickle current charge threshold
Soft-Start limits inrush current
Battery Temperature Sensing
Available in SOP-8 and ESOP-8 package
Applications
Cellular Telephones
Mobile Power Supply
Digital Still Cameras
MP3 Players
Bluetooth Applications
Portable Devices
USB Bus-Powered Chargers
AF-V1.2
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AFSEMI AF4056E
Typical Application
AF4056E
Pin Configuration
PAD is GND
AF-V1.2
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AFSEMI AF4056E
AF4056E
Pin Assignment
PIN Num.
1
2
Symbol
TEMP
PROG
Function
Temperature sense input
Connecting TEMP pin to NTC thermistors output in Lithium ion
battery pack. If TEMP pins voltage is below 45% or above 80%
of supply voltage VCC, this means that batterys temperature is
too low or too high, charging is suspended. The temperature
sense function can be disabled by grounding the TEMP pin.
Constant Charge Current Setting and Charge Current
Monitor Pin
The charge current is programmed by connecting a resistor
RPROG from this pin to GND. When in precharge mode, the
PROG pins voltage is regulated to 0.1V. When charging in
constant-current mode this pins voltage is regulated to 1V. In all
modes during charging, the voltage on this pin can be used to
measure the charge current using the following formula:
3
4
5
6
7
8
AF-V1.2
GND
VCC
BAT
STDBY
CHRG
CE
Ground
Positive input supply voltage
Provides power to the internal circuit. When VCC drops to within
80mV of the BAT pin voltage, the AF4056E enters low power
sleep mode, dropping IBAT to less than 2μA.
Battery connection Pin
Connect the positive terminal of the battery to this pin. Dropping
BAT pins current to less than 2μA when IC in disable mode or
in sleep mode. BAT pin provides charge current to the battery
and provides regulation voltage of 4.2V.
Charge terminated status output
STDBY is pulled low by an internal switch to indicate a battery
charge terminated; this means Charge termination. Otherwise
pin is in high impedance state.
Open-Drain charge status output
When the battery is being charged, the CHRG pin is pulled low
by an internal switch, otherwise, CHRG pin is in high impedance
state.
Chip enable input
A high input will put the device in the normal operating mode.
Pulling the CE pin to low level will put the AF4056E into disable
mode. The CE pin can be driven by TTL or CMOS logic level.
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