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LTC4089-1 Datasheet(PDF) 11 Page - Linear Technology |
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LTC4089-1 Datasheet(HTML) 11 Page - Linear Technology |
11 / 24 page LTC4089-1 11 40891fa The LTC4089-1 is a complete PowerPath™ controller for battery powered USB applications. The LTC4089-1 is designed to receive power from a low voltage source (e.g., USB or 5V wall adapter), a high voltage source (e.g., Firewire/IEEE1394, automotive battery, 12V wall adapter, etc.), and a single-cell Li-Ion battery. It can then deliver power to an application connected to the OUT pin and a battery connected to the BAT pin (assuming that an external supply other than the battery is present). Power supplies that have limited current resources (such as USB VBUS supplies) should be connected to the IN pin which has a programmable current limit. Battery charge current will be adjusted to ensure that the sum of the charge current and load current does not exceed the programmed input current limit (see Figure 1). An ideal diode function provides power from the battery when output / load current exceeds the input current limit or when input power is removed. Powering the load through the ideal diode instead of connecting the load directly to the battery allows a fully charged battery to remain fully charged until external power is removed. Once external power is removed the output drops until the ideal diode is forward biased. The forward biased ideal diode will then provide the output power to the load from the battery. The LTC4089-1 also includes a high voltage switching regulator which has the ability to receive power from a high voltage input. This input takes priority over the USB VBUS input (i.e., if both HVIN and IN are present, load current and charge current will be delivered via the high voltage path). When enabled, the high voltage regulator regulates the HVOUT voltage using a 750kHz constant frequency, current mode regulator. An external PFET between HVOUT (drain) and OUT (source) is turned on via the HVPR pin allowing OUT to charge the battery and/or supply power to the application. The LTC4089-1 provides a fixed 5V output. Input Current Limit Whenever the input power path is enabled (i.e., SUSP = 0V and HVIN = 0V) and power is available at IN, power is delivered to OUT. The current limit and charger control circuits of the LTC4089-1 are designed to limit input current as well as control battery charge current as a function (Refer to Block Diagram) HVOUT OUT GATE BAT BAT OUT HVPR 4089-1 F01 – + EDA 19 D1 L1 CC/CV REGULATOR CHARGER HIGH VOLTAGE BUCK REGULATOR USB CURRENT LIMIT ENABLE – + – + 21 21 21 C1 HVIN IN Q1 SW 25mV 25mV IDEAL DIODE 4.25V (RISING) 3.15V (FALLING) 75mV (RISING) 25mV (FALLING) + LOAD LI-ION + – Figure 1. Simplified PowerPath Block Diagram PowerPath is a trademark of Linear Technology Corporation. OPERATION |
Similar Part No. - LTC4089-1_15 |
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Similar Description - LTC4089-1_15 |
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