Preliminary Datasheet
LP28292
1.5A Single-chip Li-ion and Li-POL Charge with OVP
General Description
The LP28292 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 LP28292 ideally suited for portable applications.
Furthermore, the LP28292 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 LP28292 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 LP28292 automatically enters a low current
state, dropping the battery drain current to less than 2µA.
The LP28292 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.
Features
Very Low Power Dissipation
Vin Over Voltage Protection:6V
Short-circuit protection
Programmable Charge Current Up to 1500mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Constant-Current/Constant-Voltage Operation with
Thermal Regulation* to Maximize Charge Rate Without
Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly from USB
Port
25µA Supply Current in Shutdown
Time Pre-charge Conditioning With Safety Timer
Reverse Leakage Protection Prevents Battery
Drainage Charge Current Thermal Regulation Status
Outputs for LED or System Interface
Indicates Charge and Fault Conditions
Optional Battery Temperature Monitoring Before and
During Charge Automatic Sleep Mode for Low-Power
Consumption Available in 3mm × 3mm TDFN-10
Package
RoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
Order Information
LP28292 -
□ □ □
F: Pb-Free
Package Type
QV: TDFN-10
10uF
VIN
1
2
3
4
5
VIN
NC
STAT
NC
VSS
LP28292
VOUT
NC
ISET
NC
NC
10
9
8
7
6
Rset
2K
1uF
BT1
BATT
BATTERY
I
Set
=880/Rset
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA/DSC
Marking Information
Please see website.
Bluetooth Applications
LP28292 – 02 Ver. 1.2 Datasheet
Nov.-2008
Page 1 of 10
POWER [ LOWPOWER SEMICONDUCTOR INC ]
