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Texas Instruments LM3622MX-4.2
- Part No.:
- LM3622MX-4.2
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3622MX-4.2.pdf
- Description:
- IC BATT CONTRL LI-ION 1CEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,267
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Product details
Overview
LM3622MX-4.2 from Texas Instruments is a precision lithium-ion battery charge controller IC for single-cell 4.2 V nominal packs, implementing constant-voltage/constant-current (CVCC) regulation with ±30 mV/cell end-of-charge accuracy, 4.5 V–24 V input range, and 200 nA battery leakage current when VCC is disconnected.
For engineers reviewing the LM3622MX-4.2 datasheet, LM3622MX-4.2 pinout, LM3622MX-4.2 application, or LM3622MX-4.2 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated SOIC-8 pin functions, and two confirmed alternative parts for cradle charger and portable device power management designs.
Technical Context
The LM3622MX-4.2 integrates a temperature-compensated bandgap reference and current-sense amplifier to regulate battery voltage between CEL and CS pins and control external PNP or P-MOSFET pass devices via the EXT pin. It operates in CVCC mode, automatically transitioning from constant-current to constant-voltage as the cell reaches 4.20 V.
Its low-voltage detection circuit-enabled by LVENB and threshold-selected by LVSEL-supports wake-up charging at either 2.15 V/cell or 2.70 V/cell. The NPN open-collector LV output sinks up to 10 mA and remains high-impedance when LVENB is high, enabling safe preconditioning of deeply discharged cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.200 V ±30 mV/cell - ensures precise termination for graphite-anode Li-ion cells without external resistor trimming. |
| Input Voltage Range | 4.5 V to 24 V - supports wide-input cradle chargers powered from USB, wall adapters, or automotive sources. |
| CS Threshold Voltage | 100 mV typical - sets charge current as ICHG = 0.1 V / RCS, enabling accurate, low-power current sensing. |
| Battery Leakage Current | 200 nA max with VCC removed - prevents parasitic discharge during storage or standby, preserving battery state-of-charge. |
| EXT Sink Current | 15 mA min at 4 V - directly drives PNP base or P-MOSFET gate without external pull-up, simplifying linear charger BOM. |
| LV Detection Threshold | Selectable 2.15 V/cell or 2.70 V/cell - enables reliable wake-up charge initiation before full CVCC cycle begins. |
| Operating Temperature | −20°C to +70°C ambient - validated for consumer portable electronics environments including PDA and camcorder cradles. |
Pinout & Package
LM3622MX-4.2 is housed in an 8-lead SOIC (Package Drawing D), surface-mount package with standard JEDEC outline and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LVSEL | Low-voltage threshold select input | Pulling to GND selects 2.15 V/cell; pulling to VCC selects 2.70 V/cell - configures wake-up trigger point without external logic. |
| 2 - LVENB | Low-voltage detection enable input | Pulling to GND enables LV function; pulling to VCC disables it - allows system-level control over preconditioning behavior. |
| 3 - LV | NPN open-collector output | Sinks ≤10 mA when enabled and battery voltage is below threshold - drives external wake-up current source (e.g., small PNP) to recharge depleted cells. |
| 4 - GND | Ground reference | Common return for internal circuitry, CS sense resistor, and battery negative terminal - critical for accurate current and voltage measurement. |
| 5 - CS | Current sense and battery negative sensing input | Measures voltage drop across external sense resistor (RCS) to regulate charge current - referenced to GND, not battery ground. |
| 6 - CEL | Battery positive terminal voltage sensing input | Monitors cell voltage directly at battery anode - used with CS to compute total cell voltage for CV regulation. |
| 7 - EXT | External pass device drive output | Sinks current to control base/gate of external PNP or P-MOSFET - modulates conduction to maintain CV or CC regulation. |
| 8 - VCC | Power supply input | Accepts 4.5 V–24 V input - powers internal reference, comparators, and drivers; internal 20 µA pull-up on EXT eliminates external bias resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.2 V regulation | ±30 mV/cell over −20°C to +70°C - eliminates need for calibration or trimming resistors in production. |
| Integrated wake-up charge control | Configurable 2.15 V/cell or 2.70 V/cell LV threshold with dedicated NPN open-collector LV output - enables automatic recovery of deeply discharged batteries without MCU intervention. |
| Ultra-low battery drain | 200 nA max leakage from battery when VCC is absent - preserves shelf life and avoids self-discharge during long-term storage. |
| Direct PNP/P-MOSFET drive | 15 mA minimum sink capability at EXT pin with internal 20 µA pull-up - reduces component count and PCB area versus discrete driver solutions. |
| Wide-input linear charger support | 4.5 V–24 V operating range - accommodates unregulated inputs from USB PD, 5 V wall adapters, 12 V automotive, and legacy 9 V supplies. |
Applications
| Cellular Phone Cradle Charger | PDA/Notebook Cradle Charger |
|---|---|
Use Scenario: Desktop charging station for smartphones with removable Li-ion battery packs. IC Role / Device Role / Timing Role: Primary CVCC charge controller regulating voltage and current to single-cell 4.2 V battery using external PNP pass transistor. Use Value: Enables compact, low-cost cradle design with no microcontroller required and guaranteed 4.20 V ±30 mV termination accuracy. |
Use Scenario: Docking station providing bulk charging for enterprise PDAs and lightweight notebooks. IC Role / Device Role / Timing Role: Standalone linear charger controller managing charge sequencing, low-voltage wake-up, and thermal-safe CVCC transition. Use Value: Supports reliable "plug-and-forget" operation with automatic deep-discharge recovery and minimal external components. |
| Camcorder Cradle Charger | Portable Medical Monitor Charger |
Use Scenario: Field-deployable charging dock for professional camcorders using high-capacity 1S Li-ion packs. IC Role / Device Role / Timing Role: Precision voltage regulator and current limiter interfacing with external MOSFET pass element and isolated sense path. Use Value: Delivers repeatable 4.2 V charge termination across temperature and input voltage variation, extending battery cycle life. |
Use Scenario: Rechargeable battery pack for handheld diagnostic monitors requiring long shelf life and field reliability. IC Role / Device Role / Timing Role: Low-leakage charge controller ensuring <200 nA battery drain during off-grid storage while supporting wake-up preconditioning. Use Value: Maintains battery readiness for emergency use after months of storage without user-initiated maintenance cycles. |
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 |
|---|---|---|---|
| BQ2002F | Single-cell 4.2 V controller with integrated P-FET driver; no LV detection or wake-up output; 100 µA quiescent current. | Lacks low-voltage wake-up functionality and requires external current-sense amplifier for precision CC regulation. | Choose for simpler, lower-cost designs where deep-discharge recovery is not required and integrated FET drive is preferred. |
| TP4056 | Monolithic linear charger with built-in 1 A switch and thermal regulation; fixed 4.2 V output; 3.0 V–6.0 V input only. | Not suitable for >6 V input sources; no LVSEL/LVENB configuration; limited to micro-USB-powered applications. | Choose for ultra-compact, cost-sensitive USB-charged devices where input voltage is strictly 5 V and wake-up is unnecessary. |
Compared with BQ2002F and TP4056, LM3622MX-4.2 uniquely supports wide-input (4.5–24 V) cradle charging with configurable wake-up and sub-µA battery isolation - making it the only option among the three for industrial-grade, field-reliable Li-ion charging where input flexibility and deep-discharge recovery are mandatory.
Availability
LM3622MX-4.2 is available at Aetrix Electronics and suitable for cellular phone cradle chargers, PDA docking stations, and camcorder battery packs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM3622MX-4.2 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and interface technologies.
The LM3622 product line was designed specifically for cost-effective, high-accuracy linear Li-ion battery charging in consumer cradle and dock applications - emphasizing precision voltage regulation, ultra-low battery leakage, and integrated wake-up control without MCU dependency.
FAQ
What is the exact charge voltage accuracy of the LM3622MX-4.2 over temperature?
The LM3622MX-4.2 provides ±30 mV/cell end-of-charge voltage accuracy over the full operating ambient temperature range of −20°C to +70°C. This specification applies to the A-grade version and is measured at the CEL and CS pins under CV regulation mode with VCC = 5 V/cell. The LM3622MX-4.2 achieves this without external trimming components due to its internal temperature-compensated bandgap reference.
Does the LM3622MX-4.2 support two-cell (8.4 V) battery charging?
No, the LM3622MX-4.2 is specifically configured for single-cell 4.2 V lithium-ion battery charging. TI offers separate part numbers for dual-cell applications - such as LM3622MX-8.4 - which are distinct devices with different internal voltage references and qualification testing. Using LM3622MX-4.2 for 8.4 V charging would result in severe undercharging and failure to reach full capacity.
How does the LV pin function in a typical LM3622MX-4.2 application?
In a typical LM3622MX-4.2 application, the LV pin acts as a NPN open-collector output that pulls low when LVENB is grounded and the battery voltage falls below the LVSEL-set threshold (2.15 V/cell or 2.70 V/cell). This signal can drive a small external PNP transistor to deliver a controlled wake-up current - reconditioning deeply discharged cells before initiating the main CVCC charge cycle. The LM3622MX-4.2 holds LV high-impedance when LVENB is high.
What external components are required to implement a complete LM3622MX-4.2 charger?
A complete LM3622MX-4.2 charger requires an external PNP transistor or P-MOSFET as the series pass element, a current-sense resistor (RCS) between CS and GND to set charge current (ICHG = 0.1 V / RCS), and optional pull-up/pull-down resistors on LVSEL and LVENB for threshold and enable configuration. No precision voltage-divider resistors or op-amps are needed - all regulation is handled internally by the LM3622MX-4.2.
Is the LM3622MX-4.2 RoHS-compliant and lead-free?
Yes, the LM3622MX-4.2 is RoHS-compliant and lead-free. Per TI's Package Option Addendum, the LM3622MX-4.2/NOPB variant carries the "Green (RoHS & no Sb/Br)" eco-plan designation, with CU SN lead finish and JEDEC Level-1 moisture sensitivity rating. The device marking "3622 M-4.2" confirms its compliance status and 4.2 V configuration.
LM3622MX-4.2 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:
- 4.2V
- Voltage - Supply (Max):
- 24V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM3622MX-4.2 FAQ
1.How can I place an order for LM3622MX-4.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3622MX-4.2 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 LM3622MX-4.2 reliable?
The price and inventory of LM3622MX-4.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3622MX-4.2 is usually 5 days.
3.What payment methods are accepted for LM3622MX-4.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3622MX-4.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3622MX-4.2?
LM3622MX-4.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3622MX-4.2 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 LM3622MX-4.2?
For technical support, including LM3622MX-4.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3622MX-4.2 requirements.
6.How does Aetrix verify that LM3622MX-4.2 is sourced from the original manufacturer or authorized distributors?
All LM3622MX-4.2 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 LM3622MX-4.2 meets industry standards.
7.What is the process for return or replacement of LM3622MX-4.2?
All LM3622MX-4.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3622MX-4.2, 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 LM3622MX-4.2 part is unused and in its original packaging.
Return procedure for LM3622MX-4.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3622MX-4.2 Tags
-
BQ21040DBVR
Texas Instruments
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MCP73812T-420I/OT
Microchip Technology
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MCP73831T-2ACI/OT
Microchip Technology
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MCP73831T-2DCI/OT
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MCP73832T-2DCI/OT
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MCP73831T-2ATI/OT
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MCP73832T-2ATI/OT
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MCP73831T-5ACI/OT
Microchip Technology
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MCP73832T-2ACI/MC
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MCP73831T-2ACI/MC
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