R5438 Series
1-Cell to 3-Cell Li-ion Battery Second Protection IC
R5438 Series
1-Cell to 3-Cell Li-ion Battery Second Protection IC
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Description
The R5438 is an overcharge protection IC for 1 to 3 serial cells Li-ion / Li-polymer rechargeable battery. This device provides the high-accuracy voltage detection function and the shutdown function can reduce the supply current to the minimum when all cell’s voltage becomes less than the shutdown detection voltage.
Spec
Operating Input Voltage | 1.5 V to 20 V or VC1 +5 V (Maximum Rating: 26 V) | ||
Number of Cells | 1,2,3 | ||
Supply Current | Typ. 0.85 µA | ||
Shutdown Detection Voltage | 3.5 V ±0.3 V | ||
Shutdown Current | Max. 0.1 µA | ||
Overcharge Detection Voltage | 4.10 V to 4.70 V (0.005 V Steps) | ||
Overcharge Detection Voltage Accuracy | ±20 mV | ||
Overcharge Detection Delay Time | 1 s, 2 s, 4 s, 6 s With Delay Time Shortening, the delay time can be reduced to approx. 1/90 |
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Overcharge Restoration Voltage | VDET1 to VDET1−0.5 V (0.05 V Steps) | ||
Conditions for Overcharge Restoration | Voltage Release | ||
Package | DFN1814-6C |
Protections / Functions
Temperature Protection | Reset | Alarm | Cell Balance | Cascadable | Open Wire Detection | Wakeup | Short-circuit Current Detection | Delay Time Shortening |
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Functional Description
Temperature Protection | Temperature Protection |
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Reset | Reset Function |
Alarm | Alarm Function |
Cell Balance | Cell Balance Function |
Cascadable | Cascade Connect Function |
Open Wire Detection | Open Wire Detect Function |
Wakeup | Wakeup Function |
Short-circuit Current Detection | Short-circuit Current Protection |
Delay Time Shorting | Output Delay Time Short Function |
For more details, please refer to "Protecting Li-ion Batteries: Functions and Advantages".
Technical Documents
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Typical Application: Normal Mode (CMOS Output, Active-high)
Note 1: As for the order of cell's connection, connect a positive terminal of CELL1 as the end terminal.
Note 2: In Delay Shortening (DS) mode, applying a voltage of 4V between VDD and VC1 is required.
RVDD: 100 Ω, R1 to R3: 1000 Ω, CVDD,C1 to C3: 0.1 µF
Quality & Packages
Product Name | Compatibility | Package | Marking | Reliability |
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R5438LxxxxA-TR |
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DFN1814-6C | See datasheet | R5438L |
- Refer to the datasheets for the details on the product.
- The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
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R5438 Series