SGM4056 Datasheet, PDF (1/19 Pages) SG Micro Corp – High Input Voltage Charger

SGM4056
High Input Voltage Charger
GENERAL DESCRIPTION
The SGM4056 is a cost-effective, fully integrated high
input voltage single-cell Li-ion battery charger. The
charger uses a CC/CV charge profile required by Li-ion
battery. The charger accepts an input voltage up to
26.5V but is disabled when the input voltage exceeds
the OVP threshold, typically 6.8V (SGM4056-6.8) or
10.5V (SGM4056-10.5), to prevent excessive power
dissipation. The 26.5V rating eliminates the over-
voltage protection circuit required in a low input voltage
charger.
The charge current and the end-of-charge (EOC)
current are programmable with external resistors.
When the battery voltage is lower than typically 2.55V,
the charger preconditions the battery with typically 18%
of the programmed charge current. When the charge
current reduces to the programmable EOC current
level during the CV charge phase, an EOC indication is
provided by the CHG pin, which is an open-drain
output. An internal thermal foldback function protects
the charger from any thermal failure.
Two indication pins ( PPR and CHG ) allow simple
interface to a microprocessor or LEDs. When no
adapter is attached or when disabled, the charger
draws less than 1μA leakage current from the battery.
The SGM4056 is available in Green TDFN-3×3-8L,
TDFN-2×3-8L, TDFN-2×2-8L and SOIC-8 (Exposed
Pad) packages and is rated over the -40℃ to +85℃
temperature range.
FEATURES
 Complete Charger for Single-Cell Li-ion or
Polymer Batteries
 Integrated Pass Element and Current Sensor
 No External Blocking Diode Required
 Low Component Count and Cost
 Programmable Charge Current
 Programmable End-of-Charge Current
 Charge Current Thermal Foldback for Thermal
Protection
 2.55V Trickle Charge Threshold
 6.8V Input Over-Voltage Protection for SGM4056-6.8
 10.5V Input Over-Voltage Protection for SGM4056-10.5
 26.5V Maximum Voltage for the Power Input
 Power Presence and Charge Indications
 Less than 1μA Leakage Current off the Battery When
No Input Power Attached or Charger Disabled
 Available in Green TDFN-3×3-8L, TDFN-2×3-8L,
TDFN-2×2-8L and SOIC-8 (Exposed Pad) Packages
APPLICATIONS
Mobile Phones
Blue-Tooth Devices
PDAs
MP3 Players
Stand-Alone Chargers
Other Handheld Devices
SG Micro Corp
www.sg-micro.com
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