Preliminary Data Sheet
SGM4054
GENERAL DESCRIPTION
Standalone Linear Li-Ion Battery
Charger with Thermal Regulation
FEATURES
−
Programmable Charge Current Up to 800mA
−
No external MOSFET, Sense Resistor or Blocking
Diode Required
−
Complete Linear Charger in SOT23-5 Package for
Single Cell Lithium-Ion Batteries
−
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
−
Preset 4.2V Charge Voltage with
±1%
Accuracy
−
Charge Current Monitor Output for Gas Gauging
−
Automatically Recharge
−
Charge Status indication Pin
−
C/10 Charge Termination
−
25μA Supply Current in Shutdown mode
−
2.93V Trickle Charge Threshold
−
Soft-Start Limits Inrush Current
−
Lead (Pb) Free SOT23-5 Package
The SGM4054 is a complete constant-current/constant-
voltage linear charger for single cell lithium-ion batteries.
Its SOT23-5 small package and low external component
count make the SGM4054 ideally suited for portable
applications. Besides wall adapter’s 5V power supply,
the SGM4054 is specifically designed to work within USB
power specifications.
SGM4054 is high integrated charger, there is no external
current sense resistor and MOSFET, 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
SGM4054 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 SGM4054 automatically enters a low
current state, dropping the battery drain current to less
than 3μA. The SGM4054 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.
The SGM4054 has lead (Pb) free SOT23-5 package and is
rated over the -40°C to +85°C temperature range.
APPLICATIONS
Mobile Phones, PDA’s, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
Other Handheld Devices
TYPICAL APPLICATION
600mA Single Cell Li-lon Charger
V
IN
= 4.5V to 6.5V
PIN CONFIGURATIONS（TOP VIEW）
SGM4054
CHRG
1
2
5
PROG
C
IN
4
0.33kO
V
+
BAT
1.0μF to 10μF
GND
600mA
3
BAT
3
SOT23-5
4
V+
SGM4054
1
CHRG
GND
2
PROG
5
C
OUT
1.65kO
1.0μF to 10μF
4.2V
Li-lon
BATTERY
SG Microelectronics Co, Ltd
Tel: 86/10/51798160/80
www.sg-micro.com
Jul. 2007
TOREX [ TOREX SEMICONDUCTOR ]
