NB7140 Series
1-cell Li-ion Battery Protection IC with Forced Standby and Built-In System Reset Function
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Description
The NB7140 is a 1-cell Li-ion / polymer battery protection IC which provides over-charge, overdischarge, charge / discharge overcurrent and short circuit protection, with built-in system reset function. The NB7140 can shift to the Forced Standby Mode by an external signal to STB pin to reduce own current consumption.
Low voltage and high accuracy overcurrent detection achieves a heat reduction on board by using low sense resistor. Low operating current and standby current can prolong the battery life even when its capacity is small, and the forced standby mode with STB pin too can prolong the small battery life.
System reset is possible by turning off the charge FET / discharge FET during MCU runaway with the RST pin.
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Spec
Operating Input Voltage 1.5 V to 5.0 V (Maximum Rating: 12 V) Number of Cells 1 Supply Current Typ. 1.5 µA Standby Current Max. 0.04 µA (VDET2 Latch type), Max. 0.2 µA (VDET2 Auto release type) Overcharge Detection Voltage 4.2 V to 4.7 V (0.005 V Step) Overcharge Detection Voltage Accuracy ±15 mV Overcharge Detection Delay Time 1024 ms Overdischarge Detection Voltage 2.1 V to 3.2 V (0.005 V Step) Overdischarge Detection Voltage Accuracy ±35 mV Overdischarge Detection Delay Time 32 ms, 64 ms, 128 ms Discharge Overcurrent Detection Voltage VDET3-1: 0.005 V to 0.050 V (0.0005 V Step)
VDET3-2: 0.011 V to 0.100 V (0.0005 V Step)Discharge Overcurrent Detection Voltage Accuracy VDET3-1: ±1.0 mV (VDET3-1 ≤ 0.0300 V), ±1.5 mV (VDET3-1 ≥ 0.0305 V)
VDET3-2: ±2.0 mV (VDET3-2 ≤ 0.0600 V), ±4.0% (VDET3-2 ≥ 0.0605 V)Discharge Overcurrent Detection Delay Time VDET3-1-typeA: 1024 ms, 2048 ms, 3072 ms, 4096 ms,
VDET3-1-typeB: 12.5 ms, 16.5 ms, 1024 ms, 4096 ms
VDET3-2: 7.5 ms, 12.5 ms, 16.5 msCharge Overcurrent Detection Voltage -0.050 V to -0.005 V (0.0005 V Step) Charge Overcurrent Detection Voltage Accuracy ±1.5 mV (VDET4 ≤ -0.0305 V), ±1.0 mV (VDET4 ≥ -0.0300 V) Charge Overcurrent Detection Delay Time 10 ms, 17 ms Short Detection Voltage 0.030 V to 0.200 V (0.001 V Step) Short Detection Voltage Accuracy ±4.0 mV (VSHORT1 ≤ 0.120 V), ±5.0 mV (VDET4 ≥ 0.121 V) Short Detection Delay Time 280 µs Conditions for Overcharge Restoration Selectable: Auto Release / Latch Conditions for Overdischarge Restoration Selectable: Auto Release / Latch Package WLCSP-8-P10 0 V Battery Charging Selectable: Permission / Inhibition Protections / Functions
Temperature Protection Reset Alarm Cell Balance Cascadable Open Wire Detection Wakeup Short-circuit Current Detection Delay Time Shortening 
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Technical
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Typical Application
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Quality &
PackagesProduct Name Compatibility Package Marking Reliability NB7140ZAxxxxxE2S WLCSP-8-P10 See datasheet NB7140ZAS - 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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Sample / Buy
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Buy Online
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Buy, Request for Samples, Request for Information Materials
Authorized Distributors
Please contact your local distributors for any sales-related inquiry such as price, stock, delivery, etc.
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Download Datasheet
Functional Description
| Temperature Protection | Temperature Protection |
|---|---|
| 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".