SGM41526
SGM41527
1.6MHz Synchronous Li-Ion/Li-Polymer Stand-Alone
Battery Chargers with Automatic Power Path Selector
GENERAL DESCRIPTION
The SGM41526 and SGM41527 are stand-alone Li-Ion and
Li-polymer battery chargers. The PWM switches are integrated
inside and they can automatically select the power path. They
also include gate drivers for external power path selector
MOSFETs. The synchronous PWM controller runs at a fixed
frequency (1.6MHz) and is capable of providing accurate
regulation of charge voltage, charge current and input current.
They are capable of providing continuous battery pack
temperature monitoring in which the charge is only allowed
when the temperature is within the desired range. The
SGM41526 can charge 2-, 3- or 4-cell (selected by CELL pin);
while the SGM41527 has an adjustable charge voltage for up
to 4 cells. In the SGM41527, the FB pin is used for charge
voltage regulation (feedback) using an internal 2.1V reference
and comparator.
The SGM41526 and SGM41527 use dynamic power
management (DPM) to prevent overload of the input source
(AC adaptor). With DPM, the output charge current is reduced
if the input power limit is reached. The input current is sensed
and controlled by a precision current-sense amplifier to limit the
input power.
Gate driver outputs are provided for power path selection that
can be achieved by three external switches. Two N-type
back-to-back MOSFETs (Q1, Q2) are used as input pair
(adapter power in and reverse blocking control) along with a
P-type (Q3) that is used to control the battery connection to the
system bus. The system is powered from adapter by Q1 and
Q2 on if a qualified adapter is present. Otherwise, the system is
connected to the battery by Q3. And with power path control,
the battery cannot feed back to the input.
Typically, a full battery charging cycle has three consequent
phases: pre-conditioning, constant current and constant
voltage. The charge current is small during the pre-conditioning
phase in which battery is heavily depleted. When the battery
voltage exceeds a threshold voltage, the charge current
increases to its maximum (fast charge current) until the battery
voltage reaches its regulation level. Then the voltage is
regulated and charge current drops. The starting phase is
determined by the initial battery voltage. In constant voltage
condition, the charge current drops automatically. When it
decreases below 10% of the fast charge value, charging is
terminated. A programmable safety charge timer is provided to
prevent prolonged charging if it is not naturally terminated for
any reason. When the battery voltage falls below recharge
threshold, charge cycle is automatically started (or restarted).
The SGM41526 and SGM41527 can charge the battery from a
DC source with a voltage up to 22V. This range covers
common adapter voltages and the car battery voltage. The
qualified adapter range is adjustable by OVPSET pin. If the
input voltage is out of the range, Q1 and Q2 will not be turned
on.
For 1-cell applications (only applicable to SGM41527), when
the battery is not removable, the design can be simplified by
direct connection of the battery to the system. Therefore, when
the input source is overloaded, the battery can help power the
system automatically.
The SGM41526 and SGM41527 are available in a Green
TQFN-5.5×3.5-24L package. It can operate over an ambient
temperature range of -40℃ to +85℃.
If the input voltage falls below the battery voltage, the device
enters sleep mode. In sleep mode, the quiescent current is
very low.
SG Micro Corp
www.sg-micro.com
MARCH 2023
2
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