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Texas Instruments LM3622M-4.1/NOPB
- Part No.:
- LM3622M-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3622M-4.1/NOPB.pdf
- Description:
- IC BATT CONTRL LI-ION 1CEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,698
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Product details
Overview
LM3622M-4.1/NOPB 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 reliable cradle charging in portable electronics.
For engineers reviewing the LM3622M-4.1/NOPB datasheet, LM3622M-4.1/NOPB pinout, LM3622M-4.1/NOPB application, or LM3622M-4.1/NOPB equivalent, key selection criteria include its 4.1 V fixed regulation voltage, LVSEL/LVENB-configurable low-voltage wake-up detection, 15 mA EXT pin sink capability, and SOIC-8 package compatibility with linear charger topologies requiring minimal external components.
Technical Context
The LM3622M-4.1/NOPB integrates a temperature-compensated bandgap reference and precision feedback circuitry to regulate battery voltage between CEL and CS pins, with typical current-sense threshold of 100 mV across an external resistor. Its internal power-down switch disconnects the voltage divider from CS when VCC is removed, limiting battery drain to ≤200 nA.
It implements dual-mode CVCC control: constant-current mode regulates charge current by modulating EXT pin sink current (≥15 mA) to drive a PNP transistor base; constant-voltage mode maintains 4.100 V ±30 mV per cell at CEL–CS. Low-voltage detection (2.15 V/cell or 2.70 V/cell, selectable via LVSEL) enables wake-up charging when enabled via LVENB, with LV pin providing NPN open-collector output for external preconditioning circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.100 V ±30 mV/cell - ensures precise termination for 4.1 V Li-ion cells without external trimming resistors. |
| Input Voltage Range | 4.5 V–24 V - supports universal wall adapters and automotive-derived supplies in cradle chargers. |
| EXT Pin Sink Current | ≥15 mA at VEXT = 4 V - directly drives base of low-cost PNP pass transistors without external bias resistors. |
| Battery Drain Leakage | ≤200 nA when VCC disconnected - prevents self-discharge during storage or unplugged operation. |
| Low-Voltage Threshold | Selectable 2.15 V/cell or 2.70 V/cell via LVSEL - enables safe wake-up charging of deeply depleted cells. |
| Operating Ambient Temp | −20°C to +70°C - validated for consumer-grade portable device cradle environments. |
| Package | SOIC-8 (D0008A) - surface-mount compatible with standard PCB assembly and thermal management. |
Pinout & Package
LM3622M-4.1/NOPB is housed in an 8-lead SOIC package (JEDEC MS-012AC, TI drawing D0008A), with exposed pad not present and standard thermal resistance θJA = 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. LVSEL | Input | Selects low-voltage detection threshold: GND = 2.15 V/cell, VCC = 2.70 V/cell - configures wake-up sensitivity before charging. |
| 2. LVENB | Input | Enables low-voltage detection when pulled to GND; disables it when pulled to VCC - allows system-level control of wake-up function. |
| 3. LV | Output | NPN open-collector output - sinks up to 10 mA to activate external wake-up charge source when battery voltage falls below LVSEL-set threshold. |
| 4. GND | Ground | Common reference for CS, CEL, and internal circuitry - must be low-impedance return path for accurate current/voltage sensing. |
| 5. CS | Input | Senses voltage drop across external current-sense resistor (RCS) - regulates charge current to ICHG = 100 mV / RCS. |
| 6. CEL | Input | Senses battery positive terminal voltage - used with CS to compute cell voltage for CV regulation at 4.100 V. |
| 7. EXT | Output | Sinks current to drive base of external PNP transistor or gate of P-MOSFET - controls series pass element in linear charger topology. |
| 8. VCC | Power Supply | Primary supply input (4.5 V–24 V) - powers internal reference, comparators, and drive circuitry; also biases internal 20 µA pull-up on EXT. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.1 V regulation | ±30 mV/cell over −20°C to +70°C - eliminates need for calibration or external voltage dividers in single-cell 4.1 V Li-ion systems. |
| Integrated wake-up charge control | LVSEL/LVENB-configurable low-voltage detection with NPN open-collector LV output - enables automatic preconditioning of <2.15 V/cell batteries without MCU intervention. |
| Zero-resistor EXT drive | Internal 20 µA pull-up on EXT pin - removes requirement for external base/gate resistor when driving PNP or P-MOSFET pass devices. |
| Ultra-low battery leakage | ≤200 nA discharge when VCC is absent - preserves battery state-of-charge during long-term storage or unplugged cradle use. |
| Wide-input linear charger support | 4.5 V–24 V operating range with internal bandgap reference - accommodates unregulated wall adapters and variable DC sources without LDO pre-regulation. |
Applications
| Cellular Phone Cradle Charger | PDA/Notebook Cradle Charger |
|---|---|
Use Scenario: Desktop charging dock supplying regulated power to legacy single-cell Li-ion phones with 4.1 V chemistry. IC Role / Device Role / Timing Role: Charge controller managing CVCC profile, detecting deep discharge, and enabling wake-up charge before full-rate charging. Use Value: Ensures safe, compliant charging without firmware overhead; 200 nA leakage prevents overnight battery drain when dock is unplugged. |
Use Scenario: Docking station for PDAs or sub-notebooks using 4.1 V Li-ion packs, requiring plug-and-play charging with no host processor involvement. IC Role / Device Role / Timing Role: Autonomous linear charger controller regulating voltage/current, sensing cell voltage at CEL/CS, and asserting LV signal to enable trickle charge on deeply discharged units. Use Value: Eliminates need for dedicated charging MCU; LV output directly enables discrete wake-up circuit, reducing BOM count and firmware complexity. |
| Camcorder Cradle Charger | Portable Medical Monitor Charger |
Use Scenario: AC-powered cradle for consumer camcorders with removable 4.1 V Li-ion battery packs, operating across global input voltages (100–240 VAC via adapter). IC Role / Device Role / Timing Role: Primary charge controller enforcing 4.100 V ±30 mV termination and initiating constant-current phase only after wake-up threshold is met. Use Value: Guarantees cell longevity via tight voltage tolerance; LVSEL configuration allows optimization for graphite anode stability under varying ambient temperatures. |
Use Scenario: Field-deployable charging dock for handheld medical monitors with single-cell Li-ion batteries requiring guaranteed recharge after extended idle periods. IC Role / Device Role / Timing Role: Safety-critical charge supervisor verifying minimum cell voltage before enabling main charge path, using LV output to gate a current-limited wake-up source. Use Value: Prevents charging damaged or over-discharged cells; 2.15 V/cell LVSEL setting supports recovery of batteries stored below 2.5 V without risk of copper shunting. |
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 | Fixed 4.2 V regulation; no LVSEL/LVENB wake-up control; requires external sense resistor and PNP driver; 500 nA battery leakage. | Lacks programmable low-voltage detection and wake-up output - unsuitable where deep-discharge recovery is required. | Choose BQ2002F only if 4.2 V termination and absence of wake-up logic are acceptable, and higher battery leakage is tolerable. |
| TP4054 | Single-cell 4.2 V linear charger IC with integrated MOSFET; 120 mA max charge current; no external pass device support; 3 µA quiescent current. | Monolithic solution with no external transistor option - incompatible with high-current (>500 mA) or high-input-voltage (>7 V) cradle designs. | Choose TP4054 only for compact, low-power, fixed 4.2 V applications where external pass transistor flexibility and 4.1 V precision are unnecessary. |
Compared with BQ2002F and TP4054, LM3622M-4.1/NOPB uniquely supports 4.1 V precision regulation, user-selectable wake-up thresholds, and external PNP/P-MOSFET drive - making it the only option among the three for high-input-voltage cradle chargers requiring autonomous deep-discharge recovery and strict 4.1 V cell compliance.
Availability
LM3622M-4.1/NOPB is available at Aetrix Electronics and suitable for cellular phone cradle chargers, PDA docking stations, and camcorder charging docks requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for LM3622M-4.1/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 with emphasis on reliability, precision, and power efficiency.
The LM3622M-4.1/NOPB belongs to TI's battery management analog controller product line, designed specifically for cost-sensitive, autonomous linear Li-ion charging in consumer cradle and dock applications - prioritizing precision voltage regulation, ultra-low leakage, and integrated wake-up functionality.
FAQ
What is the exact regulation voltage of LM3622M-4.1/NOPB and how is it specified?
The LM3622M-4.1/NOPB provides a fixed 4.100 V ±30 mV per cell regulation voltage over −20°C to +70°C ambient temperature. This specification is guaranteed for the "A" grade variant and reflects initial accuracy without requiring external trimming components. The value is laser-trimmed at wafer test and documented in the Electrical Characteristics table of the SNVS043B datasheet under VCEL for LM3622A-4.1. This precision enables direct compatibility with 4.1 V lithium-ion cells used in legacy portable devices.
Does LM3622M-4.1/NOPB support wake-up charging for deeply discharged batteries?
Yes, LM3622M-4.1/NOPB supports wake-up charging through its LVSEL and LVENB pins. When LVENB is grounded and LVSEL is pulled to GND, the low-voltage threshold is set to 2.15 V/cell; if the battery voltage falls below this level, the LV pin is actively pulled low (NPN open-collector) to enable an external low-current source. This allows safe preconditioning before full-rate CVCC charging begins - a critical feature for recovering batteries stored below 2.5 V/cell without risk of damage.
What external components are required to implement a complete charger using LM3622M-4.1/NOPB?
A functional LM3622M-4.1/NOPB charger requires: (1) an external PNP transistor (e.g., MMBT3906) or P-MOSFET driven by the EXT pin; (2) a current-sense resistor (RCS) between battery negative and GND, sized to set ICHG = 100 mV / RCS; (3) two pull-up/down resistors for LVSEL and LVENB configuration; (4) a Schottky or silicon diode (e.g., BAT54) for battery isolation; and (5) optional RC network on CEL for noise filtering. No precision voltage-divider resistors are needed due to on-chip reference.
What is the maximum input voltage and quiescent current of LM3622M-4.1/NOPB?
The LM3622M-4.1/NOPB operates from 4.5 V to 24 V input supply (VCC), with absolute maximum rating of 24 V. Its quiescent current is 210 µA typical at VCC = 5 V and TA = 25°C, as specified in the Electrical Characteristics table. This low operating current minimizes auxiliary power draw in always-connected cradle applications while maintaining full regulation accuracy across the input range.
Is LM3622M-4.1/NOPB RoHS-compliant and what package does it use?
Yes, LM3622M-4.1/NOPB is RoHS-compliant and marked "/NOPB" to indicate lead-free (Pb-Free) Green packaging per TI's eco-plan. It uses an 8-lead SOIC package (TI drawing D0008A, JEDEC MS-012AC), with dimensions 4.9 mm × 3.9 mm × 1.45 mm and moisture sensitivity level (MSL) Level-1 (unlimited floor life at ≤30°C/60% RH). The package is compatible with standard reflow profiles and automated SMT assembly.
LM3622M-4.1/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:
- 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
LM3622M-4.1/NOPB FAQ
1.How can I place an order for LM3622M-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3622M-4.1/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-4.1/NOPB reliable?
The price and inventory of LM3622M-4.1/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-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM3622M-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3622M-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3622M-4.1/NOPB?
LM3622M-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3622M-4.1/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-4.1/NOPB?
For technical support, including LM3622M-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3622M-4.1/NOPB requirements.
6.How does Aetrix verify that LM3622M-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3622M-4.1/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-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM3622M-4.1/NOPB?
All LM3622M-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3622M-4.1/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-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM3622M-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3622M-4.1/NOPB Tags
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BQ21040DBVR
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