LP28056 Datasheet, PDF (1/9 Pages) Lowpower Semiconductor inc – Programmable Charge Current Up to 1200mA

Preliminary Datasheet
LP28056
1.2A Single-chip Li-ion and Li-POL Charge with OVP
General Description
The LP28056 is a complete constant-current/ constant-
voltage linear charger for single cell lithium-ion batteries.
Its TDFN-10 package and low external component count
make the LP28056 ideally suited for portable applications.
Furthermore, the LP28056 is specifically designed to work
within USB power specifications. Its have a over voltage
protection in input with 6.5V and support over zero
voltages of battery can charge enable.
No external sense 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 ISET rammed externally with
a single resistor. The LP28056 automatically terminates the
charge cycle when the charge current drops to 1/10th the
ISET rammed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LP28056 automatically enters a low current
state, dropping the battery drain current to less than 2µA.
The LP28056 can be put into shutdown mode, reducing the
supply current to 25µA.
Other features include charge current monitor, undervoltage
lockout, automatic recharge and a status pin to indicate
charge termination and the presence of an input voltage.
Order Information
LP28056 - □ □ □
F: Pb-Free
Package Type
SP: SOP-8(P)
Features
zVery Low Power Dissipation
zVin Over Voltage Protection:6.5V
zShort-circuit protection
zProgrammable Charge Current Up to 1200mA
zNo MOSFET, Sense Resistor or Blocking Diode
Required
zConstant-Current/Constant-Voltage Operation with
Thermal Regulation to Maximize Charge Rate Without
Risk of Overheating
zCharges Single Cell Li-Ion Batteries Directly from USB
Port
z25µA Supply Current in Shutdown
zTime Pre-charge Conditioning With Safety Timer
Reverse Leakage Protection Prevents Battery
zDrainage Charge Current Thermal Regulation Status
Outputs for LED or System Interface
zIndicates Charge and Fault Conditions
zOptional Battery Temperature Monitoring Before and
During Charge Automatic Sleep Mode for Low-Power
zConsumption Available in SOP-8P Package
zRoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
VIN
10uF
LP28056SPF
4
VIN
6 _STAT2
7 _STAT1
3 _VSS
5
BATT
ISET ²
PGND ⁹
4.7uF
Rset
1K
BATTERY
Applications
— Portable Media Players/MP3 players
— Cellular and Smart mobile phone
— PDA/DSC
— Bluetooth Applications
Marking Information
Please see website www.lowpowersemi.com
LP28056.
LP28056 – 01 Ver. 1.1 Datasheet
FEB.-2012
www.lowpowersemi.com
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