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SGM41526

アクティブ

1.6MHz Synchronous Li-Ion and Li-Polymer Stand-Alone Battery Charger with Automatic Power Path Selector

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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.

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).

If the input voltage falls below the battery voltage, the device enters sleep mode. In sleep mode, the quiescent current is very low.

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.

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.

More
特性
  • 4A Synchronous 1.6MHz PWM Charger

    Cycle-by-Cycle Current Limit

    Integrated 24V Switching MOSFETs

    Integrated Bootstrap Diode

    Digital Soft-Start

  • Up to 95.2% Charge Efficiency

  • 30V Absolute Maximum Input Voltage Rating with Adjustable Over-Voltage Threshold

  • 4.5V to 22V Input Operating Voltage Range

  • Automatic Power Path Selector (Battery/Adapter)

  • Dynamic Power Management (DPM)

  • Battery Charge Voltage: Select 2-, 3-, or 4-Cell with 4.2V/Cell

  • 18μA Battery Current (No Adapter)

  • 1.3mA Input Current (Charge Disabled)

  • High Accuracy

    ±0.4% Charge Voltage Regulation

    ±5% Charge Current Regulation

    ±4% Input Current Regulation

  • Safety

    Thermal Regulation (Current Limit for TJ = +120)

    Thermal Shutdown

    Battery Thermistor Sense Hot/Cold Charge Suspend

    Input Under-Voltage Lockout (UVLO)

    Input Over-Voltage (ACOV) Protection

アプリケーション

Tablet PCs

Portable Terminals and Printers

Portable Medical Equipment

Battery Backup Systems

注文書
Part Number
StatusPackagePinsPd-Free
RoHS
REACH
Green
MSL RatingOperating Temperature RangeMaterial ContentReliability Report
Unit Resale Price*
(Volume Range: in USD)
Lead Time**
(Volume Range: Days)
SGM41526YTQQ24G/TR
アクティブ
TQFN-5.5×3.5-24L
24
Yes
YesYesYesMSL3
-40℃ to +85℃
閲覧
閲覧
1-24 units : $2.45/unit
25-99 units : $2.1/unit
100-249 units : $1.75/unit
250-499 units : $1.4/unit
500-999 units : $1.225/unit
1000-9999 units : $0.91/unit
3K-9K : 14 days
10K-99K : 35 days
100K-999K : 84 days
1000K and above : 112 days

* 再販価格は参考価格です。正式な見積もりについては、代理店にお問い合わせください。

** 提供されるリードタイムは参考情報であり、異なる状況に応じて変更される可能性があります。

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