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UCC3911DP-3 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3911DP-3 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 12 page UCC3911-1, UCC3911-2 UCC3911-3, UCC3911-4 SLUS429B– FEBRUARY 2000 – REVISED NOVEMBER 2002 LITHIUMION AND LITHIUMPOLYMER BATTERY PROTECTOR 1 www.ti.com FEATURES D Protects Sensitive Lithium-Ion and Lithium-Polymer Cells from Overcharging and Overdischarging D Used for Two-Cell Battery Packs D No External FETs Required D Provides Protection Against Battery Pack Output Short Circuit D Extremely Low Power Drain on Batteries of About 20 µA D Low Internal FET Switch Voltage Drop D User Controllable Delay for Tripping Short Circuit Current Protector D 3-A Current Capacity APPLICATIONS D PDA, Camcorder, Digital Camera, Private Mobile Radio SIMPLIFIED APPLICATION DIAGRAM DESCRIPTION The UCC3911 is a two-cell lithium-ion (Li-Ion) and lithium-polymer (Li-Pol) battery pack protector device that incorporates an on-chip series FET switch thus reducing manufacturing costs and increasing reliability. The device’s primary function is to protect both Li-Ion and Li-Pol cells in a two-cell battery pack from being either overcharged (overvoltage) or overdischarged (undervoltage). It employs a precision bandgap voltage reference that is used to detect when either cell is approaching an overvoltage or undervoltage state. When on-board logic detects either condition, the series FET switch opens to protect the cells. A negative feedback loop controls the FET switch when the battery pack is in either the overvoltage or undervoltage state. In the overvoltage state the action of the feedback loop is to allow only discharge current to pass through the FET switch. In the undervoltage state, only charging current is allowed to flow. The operational amplifier that drives the loop is powered only when in one of these two states. In the undervoltage state the chip enters sleep mode until it senses that the pack is being charged. The FET switch is driven by a charge pump when the battery pack is in a normally charged state to achieve the lowest possible RDS(on). In this state the negative feedback loop’s operational amplifier is powered down to conserve battery power. Short circuit protection for the battery pack is provided and has a nominal delay of 100 µs before tripping. An external capacitor may be connected between CDLY and B0 to increase this delay time to allow longer overcurrent transients. A chip enable (CE) pin is provided that when held low, inhibits normal operation of the device to facilitate assembly of the battery pack. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 2000–2003, Texas Instruments Incorporated 1 3 2 4 5 7 6 8 16 14 15 13 12 10 11 9 NC SUBS SUBS GND LPWARN GND B2 CDLY B1 SUBS SUBS B0 CE B0 UCC3911 + + ISOLATED COPPER PAD ISOLATED COPPER PAD OV UV UDG–01075 |
Similar Part No. - UCC3911DP-3 |
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Similar Description - UCC3911DP-3 |
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