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Texas Instruments LM3658SD-B/NOPB
- Part No.:
- LM3658SD-B/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM3658SD-B/NOPB.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3658SD-B/NOPB from Texas Instruments is a dual-source Li-ion/polymer battery charger IC with integrated power FETs, automatic USB/AC source selection, and LDO mode activation when the TS pin is floating. It delivers up to 1000 mA charge current from AC input, supports 100 mA or 500 mA USB charging via USB_sel pin, maintains ±0.35% termination accuracy at 4.2 V, and operates in smartphones and USB-powered portable devices.
For engineers reviewing the LM3658SD-B/NOPB datasheet, LM3658SD-B/NOPB pinout, LM3658SD-B/NOPB application, or LM3658SD-B/NOPB equivalent, key selection criteria include thermal regulation at 120°C, LDO mode capability (exclusive to SD-B variant), open-drain STAT1/STAT2 status outputs, and WSON-10 package compatibility with Kelvin-sensing for precision voltage control.
Technical Context
The LM3658SD-B/NOPB implements five distinct charging modes-pre-qualification, constant-current, constant-voltage, top-off, and maintenance-with dedicated safety timers (TPREQUAL = 30 min, TCHG = 5 hr, TTOPOFF = 30 min). Its internal thermal regulation limits junction temperature to 120°C, dynamically scaling charge current based on ambient conditions and PCB thermal design.
LDO mode is uniquely enabled in the SD-B variant when the TS pin floats while CHG_IN is active, delivering regulated 4.2 V ±3.0% output at up to 1 A. Unlike SD-A or standard SD versions, only LM3658SD-B enters LDO mode under this condition; other variants suspend or fault instead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Termination Voltage | 4.2 V ±0.35% at 25°C - ensures precise full-charge cutoff for Li-ion cell longevity and safety compliance. |
| AC Input Range | 4.5 V to 6.0 V - compatible with standard 5 V wall adapters; dropout voltage ≤500 mV enables efficient operation near lower limit. |
| USB Charge Current Options | 100 mA or 500 mA - selected by USB_sel pin logic level; avoids USB port overcurrent violations. |
| Thermal Regulation Threshold | Junction temperature clamped at 120°C - prevents thermal runaway while maximizing charge rate under real-world PCB thermal constraints. |
| LDO Mode Output | 4.2 V ±3.0% at 100 mA load - provides system power when battery is absent, exclusive to LM3658SD-B/NOPB variant. |
| Quiescent Current (Power Down) | 1 µA typical - minimizes standby drain in battery-backed systems during disconnection. |
| Status Outputs | Two open-drain STAT1/STAT2 pins - drive LEDs or GPIOs directly without external pull-ups; encode all operational states per Table 1. |
Pinout & Package
LM3658SD-B/NOPB uses a thermally enhanced 3 mm × 3 mm WSON-10 package with exposed die-attach pad (DAP) soldered to GND for optimal heat dissipation. The DAP must be connected to PCB ground plane via thermal vias to achieve θJA = 54°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHG_IN | AC wall adapter input | Primary high-priority power source; accepts 4.5–6.0 V; enables full-rate charging up to 1000 mA. |
| USBpwr | USB power input | Secondary power source; 4.35–6.0 V range; used only if CHG_IN is absent or invalid. |
| GND | Power and signal reference | Common return for all circuits; connects to DAP for thermal conduction and noise reduction. |
| USB_sel | USB charge current select | Pull low → 100 mA; pull high → 500 mA; also selects timer duration in SD-A variant (not applicable to SD-B). |
| EN_b | Active-low enable | Pull low → enable charging; pull high → disable with ultra-low 1 µA quiescent current. |
| STAT2 | Open-drain status output | Active-low indicator; encodes charge state jointly with STAT1 (e.g., both ON = LDO mode or bad battery). |
| STAT1 | Open-drain status output | Paired with STAT2; together they unambiguously indicate pre-qual, CC/CV, top-off, completion, or fault. |
| ISET | Charge current programming | Resistor-to-GND sets AC charge current: RISET = 3.3 kΩ → ~760 mA; 5 kΩ → ~500 mA; 10 kΩ → ~245 mA. |
| TS | Battery temperature sense | Connects to NTC thermistor; floating condition triggers LDO mode *only* in LM3658SD-B/NOPB. |
| BATT | Battery positive terminal | Kelvin-sensed connection point; enables ±0.35% termination accuracy independent of PCB trace resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic dual-source selection | CHG_IN always prioritized over USBpwr; seamless handover without host intervention or firmware control. |
| On-board Kelvin sensing | Eliminates voltage drop error from PCB traces, enabling ±0.35% termination accuracy critical for Li-ion cell safety. |
| Integrated thermal regulation | Maintains 120°C junction limit using internal FETs-no external thermal sensor or feedback loop required. |
| LDO mode (SD-B only) | Enables system operation without battery when AC adapter is connected and TS pin floats-no additional regulator needed. |
| Pre-conditioning for near-depleted cells | Applies 50 mA trickle charge until battery reaches 3.0 V, preventing damage from deep discharge recovery. |
| Dedicated safety timers | Independent TPREQUAL (30 min), TCHG (5 hr), and TTOPOFF (30 min) prevent infinite charging and thermal stress. |
Applications
| Smartphones | Digital Still Cameras |
|---|---|
Use Scenario: Compact handheld device requiring simultaneous USB and wall-adapter charging with minimal external components. IC Role / Device Role / Timing Role: Dual-input Li-ion charger managing battery health, status indication, and thermal safety without MCU supervision. Use Value: Reduces BOM count by integrating power FETs, current sensing, and temperature monitoring-enabling single-chip charging solution. |
Use Scenario: Intermittent-use imaging device needing reliable recharge from PC USB ports or travel adapters. IC Role / Device Role / Timing Role: Charger IC providing 100 mA USB-safe charging and fast 500 mA mode when wall adapter is present. Use Value: Eliminates need for separate USB enumeration logic; USB_sel pin configures current without software overhead. |
| USB-Powered Portable Devices | Hard Drive / Flash-Based MP3 Players |
Use Scenario: Battery-powered accessories (e.g., Bluetooth headsets, portable speakers) drawing power from host USB ports. IC Role / Device Role / Timing Role: Regulated charger ensuring compliance with USB 2.0 current limits while maintaining battery integrity. Use Value: Prevents host port shutdown via strict 100 mA/500 mA enforcement and automatic source arbitration. |
Use Scenario: Consumer audio player with removable battery and dual charging options for home and on-the-go use. IC Role / Device Role / Timing Role: Charger supporting maintenance mode to sustain battery voltage between uses and top-off cycle for full capacity. Use Value: Extends usable runtime between charges via automatic 200 mV restart threshold and 30-minute top-off timer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Single-input (USB-only); no AC wall adapter support; fixed 500 mA USB charge; no LDO mode. | Suitable only for USB-native designs; lacks dual-source flexibility and thermal regulation granularity. | Select when cost-sensitive USB-only charging suffices and AC input is unnecessary. |
| TPS65023RSBR | Multi-rail PMIC with integrated Li-ion charger; supports 500 mA USB charging but requires external AC-DC converter; no LDO mode. | Used in complex systems needing multiple power rails; adds design complexity versus single-function LM3658SD-B/NOPB. | Choose when system-level power management (LDOs, DC/DCs) justifies added integration and footprint. |
Compared with BQ24075RGTR and TPS65023RSBR, LM3658SD-B/NOPB uniquely combines dual-input autonomy, on-die thermal regulation, and battery-absent LDO functionality in a 3 mm × 3 mm WSON package-making it optimal for space-constrained portable devices requiring robust, self-contained charging.
Availability
LM3658SD-B/NOPB is available at Aetrix Electronics and suitable for smartphones, digital still cameras, and USB-powered portable devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3658SD-B/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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management ICs for portable electronics.
The LM3658 product line was designed specifically for single-cell Li-ion/polymer battery charging in space-constrained portable applications, emphasizing integration, thermal resilience, and dual-source flexibility without MCU dependency.
FAQ
What distinguishes LM3658SD-B/NOPB from other LM3658 variants?
The LM3658SD-B/NOPB is uniquely defined by its LDO mode behavior: when the TS pin is left floating and CHG_IN is powered, it automatically regulates 4.2 V ±3.0% at up to 1 A-enabling system operation without a battery. This function is absent in LM3658SD and LM3658SD-A variants, which enter suspend or fault states instead.
How does LM3658SD-B/NOPB handle battery temperature monitoring?
LM3658SD-B/NOPB continuously monitors battery temperature via the TS pin using internal comparators (VTL = 0.49 V, VTH = 2.49 V) tied to an NTC thermistor. If temperature falls outside the valid window, charging suspends and STAT1/STAT2 both turn off. Leaving TS floating invokes LDO mode-not temperature fault-in this specific variant.
Can LM3658SD-B/NOPB charge from both USB and AC sources simultaneously?
No-LM3658SD-B/NOPB performs automatic source selection: CHG_IN has priority. When both CHG_IN and USBpwr are valid, the IC draws power exclusively from CHG_IN and ignores USBpwr. USBpwr is used only if CHG_IN is absent, disconnected, or below VPOR (3.0 V).
What is the purpose of the ISET pin on LM3658SD-B/NOPB?
The ISET pin on LM3658SD-B/NOPB sets the full-rate AC charge current via an external resistor to GND: ICHG ≈ 2500 A·Ω / RISET. For example, a 5 kΩ resistor yields ~500 mA. This pin has no effect on USB charging, which is controlled solely by the USB_sel pin logic level.
Does LM3658SD-B/NOPB require external MOSFETs or current-sense resistors?
No-LM3658SD-B/NOPB integrates power FETs, reverse-current protection, and current sensing. It needs only an ISET resistor for AC current setting, input/output capacitors (1 µF minimum), and optional thermistor on TS. No external sense resistors, gate drivers, or discrete FETs are required.
LM3658SD-B/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Current, Over Temperature
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM3658SD-B/NOPB FAQ
1.How can I place an order for LM3658SD-B/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3658SD-B/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 LM3658SD-B/NOPB reliable?
The price and inventory of LM3658SD-B/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3658SD-B/NOPB is usually 5 days.
3.What payment methods are accepted for LM3658SD-B/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3658SD-B/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3658SD-B/NOPB?
LM3658SD-B/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3658SD-B/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 LM3658SD-B/NOPB?
For technical support, including LM3658SD-B/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3658SD-B/NOPB requirements.
6.How does Aetrix verify that LM3658SD-B/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3658SD-B/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 LM3658SD-B/NOPB meets industry standards.
7.What is the process for return or replacement of LM3658SD-B/NOPB?
All LM3658SD-B/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3658SD-B/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 LM3658SD-B/NOPB part is unused and in its original packaging.
Return procedure for LM3658SD-B/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3658SD-B/NOPB Tags
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BQ21040DBVR
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