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Texas Instruments LM3622M-8.2/NOPB
- Part No.:
- LM3622M-8.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3622M-8.2/NOPB.pdf
- Description:
- IC BATT CONTRL LI-ION 2CEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
LM3622M-8.2/NOPB from Texas Instruments is a precision 2-cell (8.2 V) lithium-ion battery charge controller IC that regulates external PNP or P-MOSFET pass elements in constant-current/constant-voltage (CVCC) mode. It delivers ±30 mV/cell voltage regulation accuracy, supports 4.5 V–24 V input range, sinks ≥15 mA at EXT pin, and features user-selectable low-voltage wake-up detection (2.15 V/cell or 2.70 V/cell) for deeply discharged packs in portable cradle chargers.
For engineers reviewing the LM3622M-8.2/NOPB datasheet, LM3622M-8.2/NOPB pinout, LM3622M-8.2/NOPB application, or LM3622M-8.2/NOPB equivalent, key selection criteria include its 8.2 V fixed regulation voltage, SOIC-8 package compatibility, open-collector LV output for preconditioning control, low 200 nA battery leakage, and absence of external precision resistors for voltage setting.
Technical Context
The LM3622M-8.2/NOPB implements a linear CVCC charging architecture using an internal temperature-compensated bandgap reference and external current-sense resistor (RCS) to regulate charge current at 100 mV/RCS. Its CEL and CS pins sense battery positive and negative terminals respectively, enabling accurate two-point voltage measurement independent of PCB trace resistance.
Control logic integrates low-voltage detection with user-configurable thresholds via LVSEL and LVENB inputs, and drives the EXT pin with a 20 µA internal pull-up to simplify PNP base drive. The NPN open-collector LV output provides a dedicated signal path to enable external wake-up current sources without interfering with main charge control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 8.200 V ±30 mV/cell - ensures precise termination for 2-cell Li-ion packs with coke or graphite anodes |
| Input Voltage Range | 4.5 V to 24 V - supports wide-input wall adapters and automotive-derived supplies without external regulators |
| EXT Sink Current | ≥15 mA at 4 V–8 V - directly drives base of low-cost PNP transistors or gate of P-MOSFETs without external bias resistors |
| Battery Leakage | 200 nA max when VCC removed - prevents self-discharge during standby or source removal |
| Low-Voltage Threshold | Selectable 2.15 V/cell or 2.70 V/cell - enables safe wake-up charging of deeply depleted cells before CVCC initiation |
| Operating Temp | −20°C to +85°C - validated for industrial-grade cradle charger environments |
| Package | SOIC-8 (D0008A) - surface-mount compatible with standard reflow profiles and automated assembly |
Pinout & Package
The LM3622M-8.2/NOPB is housed in an 8-lead SOIC package (JEDEC MS-012, TI drawing D), with exposed pad not present and thermal resistance θJA = 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. LVSEL | Low-voltage threshold select input | Pull to GND for 2.15 V/cell or to VCC for 2.70 V/cell; sets wake-up trigger point for deeply discharged batteries |
| 2. LVENB | Low-voltage detection enable input | Pull to GND to activate LV function; pull to VCC to disable and force immediate CVCC start regardless of cell voltage |
| 3. LV | NPN open-collector output | Sinks up to 10 mA to signal low-voltage condition and enable external wake-up current source (e.g., Q1 in Figure 9) |
| 4. GND | Ground reference | Common return for CS sensing, EXT drive, and internal circuitry; must be low-impedance connection to battery negative |
| 5. CS | Current sense and battery negative sense input | Measures voltage drop across external RCS to regulate charge current; also serves as battery negative reference for CEL |
| 6. CEL | Battery positive terminal sense input | Monitors cell stack voltage at positive terminal; internal power-down switch isolates it from battery when VCC is absent |
| 7. EXT | External pass element drive output | Sinks current to control base/gate of series PNP/P-MOSFET; internal 20 µA pull-up eliminates need for external bias resistor |
| 8. VCC | Power supply input | Accepts 4.5 V–24 V; powers internal reference, comparators, and drive circuitry; reverse voltage on EXT must not exceed VCC + 0.3 V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 8.2 V regulation | Eliminates external voltage-setting resistors and associated tolerance drift; optimized for 2-cell Li-ion with coke anode chemistry |
| Programmable low-voltage wake-up | Enables safe pre-conditioning of cells below 2.15 V/cell using external low-current source, preventing damage from forced CVCC entry |
| Integrated power-down switch on CEL | Reduces battery drain to ≤200 nA when input source is disconnected, preserving pack charge during storage or transport |
| Internal 20 µA EXT pull-up | Removes need for external base-emitter or gate-source resistor when driving PNP or P-MOSFET, simplifying BOM and layout |
| Open-collector LV output | Provides isolated, low-power signaling path to control external wake-up circuitry without loading main charge control loop |
Applications
| Cellular Phone Cradle Charger | PDA/Notebook Cradle Charger |
|---|---|
Use Scenario: Desktop docking station supplying regulated DC to recharge 2-cell Li-ion battery in legacy mobile handsets. IC Role / Device Role / Timing Role: Primary charge controller managing CVCC sequencing, end-of-charge cutoff, and low-voltage wake-up for deeply discharged units. Use Value: Enables reliable full-charge recovery from 2.15 V/cell without requiring manual intervention or separate pre-charge ICs. | Use Scenario: Portable computing accessory providing hot-swap battery charging while device remains operational. IC Role / Device Role / Timing Role: Precision voltage regulator and current limiter interfacing with external P-MOSFET pass element to minimize dropout and thermal stress. Use Value: Delivers ±30 mV/cell regulation accuracy over −20°C to +85°C, ensuring consistent charge termination across environmental conditions. |
| Camcorder Cradle Charger | Industrial Handheld Terminal Charger |
Use Scenario: High-reliability field charger for professional video equipment with removable 2-cell Li-ion packs. IC Role / Device Role / Timing Role: Battery management interface coordinating charge current regulation, voltage termination, and fault-safe wake-up activation. Use Value: Supports wide 4.5 V–24 V input range to accommodate universal AC/DC adapters and vehicle power sources without redesign. | Use Scenario: Ruggedized dock for warehouse or logistics handhelds requiring long-term battery health maintenance. IC Role / Device Role / Timing Role: Standalone linear charger controller with programmable low-voltage detection to prevent cell degradation from chronic under-voltage operation. Use Value: Reduces battery leakage to 200 nA during idle periods, extending shelf life and minimizing maintenance cycles for infrequently used devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24032ARHLR | Integrates power-path management, USB/AC adapter auto-detection, and integrated MOSFETs; requires no external pass transistor | Designed for compact single-cell systems with dynamic input source selection; lacks dual-threshold wake-up and 8.2 V fixed output | Select when system requires integrated FETs, automatic source arbitration, and smaller footprint - not for 2-cell 8.2 V fixed-output cradle designs |
| MAX1555 | Fixed 4.2 V single-cell output; includes thermal regulation and status outputs; no LVSEL/LVENB configuration pins | Targeted at cost-sensitive consumer electronics with simple single-cell requirements; no support for 2-cell or programmable wake-up | Select only for 1-cell 4.2 V applications where low-voltage preconditioning and dual-cell voltage are irrelevant |
Compared with BQ24032ARHLR and MAX1555, the LM3622M-8.2/NOPB uniquely provides factory-trimmed 8.2 V regulation for 2-cell Li-ion packs, user-selectable low-voltage thresholds, and external pass element flexibility - making it optimal for industrial cradle chargers requiring robustness, configurability, and fixed-voltage precision without integrated switching.
Availability
LM3622M-8.2/NOPB is available at Aetrix Electronics and suitable for cellular phone cradle chargers, PDA/Notebook docking stations, camcorder battery docks, and industrial handheld terminal chargers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM3622M-8.2/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM3622 product line was designed specifically for linear lithium-ion battery charge control in cradle and dock-based applications, emphasizing precision voltage regulation, low quiescent current, and configurable low-voltage wake-up functionality without external trimming components.
FAQ
What is the exact regulation voltage of the LM3622M-8.2/NOPB and how is it trimmed?
The LM3622M-8.2/NOPB has a factory-trimmed regulation voltage of 8.200 V ±30 mV per cell, confirmed in the Electrical Characteristics table for the LM3622A-8.2 variant at TJ = 0°C to +70°C. This value is laser-trimmed during production and does not require external resistors - the "-8.2" suffix explicitly denotes this fixed 2-cell (8.2 V) version. The LM3622M-8.2/NOPB achieves this accuracy using an internal temperature-compensated bandgap reference, eliminating calibration components.
Does the LM3622M-8.2/NOPB support both coke and graphite anode lithium-ion batteries?
Yes, the LM3622M-8.2/NOPB explicitly supports both coke and graphite anode chemistries, as stated in the FEATURES section of the datasheet. The 8.2 V regulation point corresponds to 4.1 V per cell, which is specified for coke anode configurations. The device's ±30 mV/cell accuracy and wide input range ensure safe, repeatable charging across both chemistries when paired with appropriate external pass elements and thermal management.
How does the LV pin function in the LM3622M-8.2/NOPB and what load can it drive?
The LV pin on the LM3622M-8.2/NOPB is a NPN open-collector output rated to sink up to 10 mA maximum. It goes low-impedance when LVENB is pulled to GND and the battery voltage falls below the LVSEL-selected threshold (2.15 V/cell or 2.70 V/cell). In the LM3622M-8.2/NOPB typical application, LV drives the base of an external PNP transistor (Q1) to enable a low-current wake-up source. Users must select a pull-up resistor that limits current to <10 mA - e.g., ≥500 Ω with a 5 V rail.
Can the LM3622M-8.2/NOPB operate without an external pass transistor?
No, the LM3622M-8.2/NOPB cannot operate without an external pass transistor. It is a controller-only IC - the EXT pin sinks current to modulate the base of an external PNP bipolar transistor or gate of a P-MOSFET, which serves as the series pass element. The LM3622M-8.2/NOPB contains no integrated power switches. Attempting to use it without an external pass device will result in no charge current delivery and potential regulation failure.
What is the maximum allowable voltage on the EXT pin relative to VCC for the LM3622M-8.2/NOPB?
The EXT pin voltage must not exceed VCC + 0.3 V for the LM3622M-8.2/NOPB, as specified in the Absolute Maximum Ratings table. Exceeding this limit risks reverse current flow from EXT into VCC, potentially damaging the internal 20 µA pull-up circuit. This constraint applies regardless of whether a PNP or P-MOSFET is used. Designers must ensure that external circuitry - such as flyback paths or gate capacitance discharge - does not cause transient overshoot beyond this threshold.
LM3622M-8.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2
- Current - Charging:
- Constant
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 8.2V
- Voltage - Supply (Max):
- 24V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM3622M-8.2/NOPB FAQ
1.How can I place an order for LM3622M-8.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3622M-8.2/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3622M-8.2/NOPB reliable?
The price and inventory of LM3622M-8.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3622M-8.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3622M-8.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3622M-8.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3622M-8.2/NOPB?
LM3622M-8.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3622M-8.2/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3622M-8.2/NOPB?
For technical support, including LM3622M-8.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3622M-8.2/NOPB requirements.
6.How does Aetrix verify that LM3622M-8.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3622M-8.2/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3622M-8.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3622M-8.2/NOPB?
All LM3622M-8.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3622M-8.2/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3622M-8.2/NOPB part is unused and in its original packaging.
Return procedure for LM3622M-8.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3622M-8.2/NOPB Tags
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BQ21040DBVR
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