My Inquiry
My Account
Texas Instruments LM3622AMX-4.1
- Part No.:
- LM3622AMX-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3622AMX-4.1.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3622AMX-4.1 from Texas Instruments is a precision lithium-ion battery charge controller IC for single-cell (4.1 V) applications, implementing constant-voltage/constant-current (CVCC) regulation via external PNP pass transistor control. It delivers ±30 mV/cell end-of-charge voltage accuracy, 4.5 V–24 V wide input range, and 200 nA battery leakage current when VCC is disconnected - enabling low-power cradle chargers for portable electronics.
For engineers reviewing the LM3622AMX-4.1 datasheet, LM3622AMX-4.1 pinout, LM3622AMX-4.1 application, or LM3622AMX-4.1 equivalent, key selection criteria include its 4.1 V fixed regulation voltage, LVSEL/LVENB-configurable low-voltage wake-up detection, EXT pin's 15 mA sink capability for PNP base drive, and SOIC-8 package compatibility with linear charger topologies requiring minimal external components.
Technical Context
The LM3622AMX-4.1 integrates a temperature-compensated bandgap reference and precision feedback circuitry to regulate battery voltage between CEL and CS pins while controlling charge current via an external sense resistor. Its internal architecture eliminates need for precision external resistors and ensures stable CVCC transition across −20°C to +70°C ambient.
It implements user-selectable low-voltage detection (2.15 V/cell or 2.70 V/cell via LVSEL) with enable/disable control (LVENB), and drives the NPN open-collector LV output to initiate pre-conditioning charge for deeply discharged cells. The EXT pin modulates sink current to regulate either charge current (in CC mode) or battery voltage (in CV mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.100 V ±30 mV/cell at TJ = 0°C to +70°C - ensures precise termination for 4.1 V Li-ion chemistries without external trimming. |
| Input Voltage Range | 4.5 V to 24 V - supports universal input adapters and automotive-derived supplies in portable cradle designs. |
| EXT Pin Sink Current | 15 mA minimum at VEXT = 4 V - directly drives base of low-cost PNP pass transistors without external bias resistors. |
| Battery Leakage Current | 200 nA max when VCC disconnected - prevents parasitic discharge during standby, critical for long-term battery retention. |
| Low-Voltage Threshold | Selectable 2.15 V/cell or 2.70 V/cell via LVSEL pin - enables safe wake-up charging of over-discharged Li-ion cells before full CVCC cycle. |
| Quiescent Current | 210 µA typical - minimizes system power overhead during active charge control without compromising regulation fidelity. |
| Package | SOIC-8 (D0008A) - surface-mount compatible with standard PCB assembly processes and thermal management up to 170°C/W θJA. |
Pinout & Package
LM3622AMX-4.1 is housed in an 8-lead SOIC surface-mount package (JEDEC MS-012, TI drawing D). Thermal resistance θJA is 170°C/W at TA = 25°C.
| 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 - configures wake-up trigger point without external logic. |
| 2. LVENB | Low-voltage detection enable input | Pull to GND to activate LV function; pull to VCC disables detection and forces immediate CC-mode start regardless of battery voltage. |
| 3. LV | NPN open-collector output | Sinks ≤10 mA when enabled and battery voltage falls below threshold - drives external wake-up current source (e.g., small PNP) for preconditioning. |
| 4. GND | Ground reference | Common return for CS sense resistor, internal circuits, and external pass element emitter - must be low-impedance for accurate current sensing. |
| 5. CS | Current-sense and battery negative terminal input | Measures voltage drop across external RCS resistor (100 mV typical threshold) - sets charge current as ICHG = 0.1 V / RCS. |
| 6. CEL | Battery positive terminal voltage sense input | Monitors cell voltage relative to CS - forms feedback loop for CV regulation; internal power-down switch isolates it when VCC is removed. |
| 7. EXT | External pass element driver output | Sinks current to control base/gate of PNP or P-MOSFET - modulated to maintain either constant current (CC) or constant voltage (CV) phase. |
| 8. VCC | Power supply input | Accepts 4.5 V–24 V; powers internal reference, comparators, and drivers - includes internal 20 µA pull-up on EXT pin to simplify PNP biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.1 V regulation | ±30 mV/cell accuracy over temperature eliminates need for calibration or trimming resistors in production. |
| Integrated low-voltage wake-up logic | Configurable 2.15 V/cell or 2.70 V/cell threshold with dedicated LV output - enables automatic recovery of deeply discharged Li-ion cells. |
| Zero external resistor requirement for voltage setting | Fixed internal reference and feedback network - reduces BOM count and improves long-term stability vs. resistor-based solutions. |
| Ultra-low battery drain | 200 nA max leakage from CEL/CS path when VCC is absent - preserves battery state-of-charge during storage or unplugged operation. |
| Direct PNP/P-MOSFET drive | 15 mA EXT sink capability with internal 20 µA pull-up - removes need for base/gate bias resistors and simplifies discrete pass element interface. |
Applications
| Cellular Phone Cradle Charger | PDA/Notebook Cradle Charger |
|---|---|
|
Use Scenario: Desktop docking station providing primary charging for legacy Li-ion-powered mobile phones with 4.1 V nominal cells. IC Role / Device Role / Timing Role: Charge controller managing CVCC profile, detecting low-voltage states, and enabling wake-up pre-charge before main cycle. Use Value: Ensures safe, full-capacity recharge of batteries stored at low voltage without manual intervention or external supervision. |
Use Scenario: Portable computing accessory that charges PDAs or sub-notebooks via standardized cradle interface with variable input voltage. IC Role / Device Role / Timing Role: Primary voltage/current regulator interfacing with external PNP pass transistor and current-sense resistor. Use Value: Delivers consistent 4.1 V termination across ambient temperatures while minimizing quiescent power draw during idle periods. |
| Camcorder Cradle Charger | Industrial Handheld Terminal Charger |
|
Use Scenario: AC-powered dock for consumer camcorders using single-cell Li-ion packs rated for 4.1 V chemistry. IC Role / Device Role / Timing Role: Precision CVCC controller with integrated low-voltage detection to handle intermittent use and deep discharge events. Use Value: Prevents capacity loss from chronic undercharging by automatically initiating wake-up charge when battery drops below 2.15 V/cell. |
Use Scenario: Ruggedized field terminal dock used in warehouse or logistics environments where batteries may sit unused for weeks. IC Role / Device Role / Timing Role: Standalone linear charge controller ensuring reliable first-charge recovery and repeatable full-charge cycles. Use Value: Maintains battery health over extended shelf life via ultra-low 200 nA leakage and programmable low-voltage reconditioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2002FSN | Single-cell 4.2 V fixed regulation; no LVSEL/LVENB wake-up logic; requires external voltage divider for 4.1 V configuration. | Lacks configurable low-voltage detection and wake-up output - unsuitable for deeply discharged battery recovery scenarios. | Choose BQ2002FSN only if 4.2 V termination is acceptable and wake-up functionality is handled externally. |
| MAX1555 | USB-powered (max 6.5 V input); integrates USB enumeration and thermal foldback; no LVSEL/LVENB pins; fixed 4.2 V output. | Designed for USB host-port charging only; incompatible with wide-input (4.5–24 V) adapter-based systems. | Select MAX1555 only for USB-native applications requiring integrated USB interface compliance and thermal safety features. |
Compared with BQ2002FSN and MAX1555, the LM3622AMX-4.1 uniquely combines factory-trimmed 4.1 V regulation, wide-input support, and user-configurable wake-up logic - making it the only option among the three suitable for adapter-fed cradle chargers requiring guaranteed 4.1 V termination and autonomous deep-discharge recovery.
Availability
LM3622AMX-4.1 is available at Aetrix Electronics and suitable for cellular phone cradle chargers, PDA/Notebook cradle chargers, and camcorder cradle chargers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM3622AMX-4.1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM3622AMX-4.1 belongs to TI's dedicated battery management IC portfolio, engineered specifically for cost-sensitive, high-reliability linear Li-ion charger applications in consumer docking and cradle systems.
FAQ
What is the exact regulation voltage tolerance of the LM3622AMX-4.1 over temperature?
The LM3622AMX-4.1 provides ±30 mV/cell regulation voltage accuracy over the operating junction temperature range of −20°C to +85°C. This specification applies to the A-grade version and is confirmed in the Electrical Characteristics table of the SNVS043B datasheet under "Regulation Voltage" for LM3622A-4.1. The LM3622AMX-4.1 achieves this without external trimming components due to its internal temperature-compensated bandgap reference.
Does the LM3622AMX-4.1 support dual-cell (2S) battery configurations?
No, the LM3622AMX-4.1 is strictly a single-cell (1S) charge controller configured for 4.1 V nominal Li-ion chemistry. Dual-cell variants such as LM3622AMX-8.2 or LM3622AMX-8.4 exist but are separate orderable parts with different internal voltage references. The LM3622AMX-4.1 cannot be reconfigured or externally adjusted to regulate 8.2 V or 8.4 V - attempting to do so results in incorrect charge termination and potential cell damage.
How does the LV pin function in a typical LM3622AMX-4.1 application?
In the LM3622AMX-4.1, the LV pin is a NPN open-collector output that goes low-impedance when LVENB is grounded and the sensed battery voltage falls below the LVSEL-selected threshold (2.15 V/cell or 2.70 V/cell). It sinks up to 10 mA and is typically pulled up to a low-current wake-up supply (e.g., via resistor to VIN) to activate a pre-charge transistor. This behavior is intrinsic to the LM3622AMX-4.1 and enables autonomous recovery of deeply discharged cells without microcontroller intervention.
Can the LM3622AMX-4.1 operate with input voltages below 4.5 V?
No - the LM3622AMX-4.1 has a specified minimum operating supply voltage of 4.5 V per the Absolute Maximum and Operating Ratings tables. Operation below 4.5 V risks failure to initiate or sustain the constant-current phase, inaccurate voltage regulation, or unpredictable LV pin behavior. The LM3622AMX-4.1 is not designed for USB 5 V (which may dip below 4.5 V under load) unless tightly regulated; for such cases, TI recommends alternatives like the BQ2002 or MAX1555.
What package type and marking identify the LM3622AMX-4.1?
The LM3622AMX-4.1 is supplied in an 8-pin SOIC package (TI drawing D, JEDEC MS-012) with device marking "3622 M-4.1" on the top surface. The "MX" suffix denotes tape-and-reel packaging (2,500 units per reel), and the "-4.1" explicitly identifies the 4.1 V regulation version. This marking is verified in TI's Package Option Addendum and matches the orderable part number LM3622AMX-4.1 listed in official TI documentation.
LM3622AMX-4.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 24V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM3622AMX-4.1 FAQ
1.How can I place an order for LM3622AMX-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3622AMX-4.1 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 LM3622AMX-4.1 reliable?
The price and inventory of LM3622AMX-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3622AMX-4.1 is usually 5 days.
3.What payment methods are accepted for LM3622AMX-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3622AMX-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3622AMX-4.1?
LM3622AMX-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3622AMX-4.1 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 LM3622AMX-4.1?
For technical support, including LM3622AMX-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3622AMX-4.1 requirements.
6.How does Aetrix verify that LM3622AMX-4.1 is sourced from the original manufacturer or authorized distributors?
All LM3622AMX-4.1 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 LM3622AMX-4.1 meets industry standards.
7.What is the process for return or replacement of LM3622AMX-4.1?
All LM3622AMX-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM3622AMX-4.1, 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 LM3622AMX-4.1 part is unused and in its original packaging.
Return procedure for LM3622AMX-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3622AMX-4.1 Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
