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Texas Instruments LP3947ISDX-51/NOPB
- Part No.:
- LP3947ISDX-51/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LP3947ISDX-51/NOPB.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,126
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Product details
Overview
LP3947ISDX-51/NOPB from Texas Instruments is a USB/AC adaptor single-cell Li-ion battery charger IC with integrated pass transistor, I²C programmability, and dual-mode operation (charger/LDO). It delivers 500 mA charge current in AC adaptor mode, regulates battery voltage to 4.2 V ±1%, and features 5.6-hour safety timer, temperature monitoring via Ts pin, and open-drain CHG/EOC status outputs for portable electronics power management.
For engineers reviewing the LP3947ISDX-51/NOPB datasheet, LP3947ISDX-51/NOPB pinout, LP3947ISDX-51/NOPB application, or LP3947ISDX-51/NOPB equivalent, this page provides verified technical context, exact pin functions, real-world charging profiles, thermal design guidance for WSON-14 package, and validated alternative parts for USB-powered Li-ion charging systems requiring programmable current, voltage, and EOC thresholds.
Technical Context
The LP3947ISDX-51/NOPB implements a four-phase charge algorithm-pre-qualification (≤70 mA), constant-current (500 mA default), constant-voltage (4.2 V regulation), and maintenance-with automatic transition based on VBATT and ICHG. Its internal 120 mΩ current-sense resistor enables analog charge-current monitoring via Diff-Amp output (0.583–1.790 V over 50–750 mA).
Operation is controlled by MODE (AC/USB selection), ISEL (USB current mode), EN (enable/disable), and Ts (temperature sense/LDO mode). The I²C interface (400 kHz, 7-bit address 0x47) allows runtime configuration of charge current (100–750 mA), battery voltage (4.1 V or 4.2 V), and EOC threshold (0.1C/0.15C/0.2C); factory defaults apply at power-up if I²C is unused.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | 500 mA default in AC adaptor mode; programmable 100–750 mA via I²C or MODE/ISEL pins |
| Battery Regulation Voltage | 4.2 V ±1% over −40°C to +85°C junction temperature - ensures precise full-charge termination for Li-ion cells |
| Input Voltage Range | 4.3 V to 6.0 V - supports standard USB 5 V and AC adaptors up to 6 V without external regulation |
| Safety Timer | 5.6-hour fixed timeout in constant-current mode - prevents overcharge if EOC fails or battery is defective |
| Temperature Monitoring | Voltage-based Ts pin interface (1.39 V–2.43 V valid range) with automatic charge suspension outside limits |
| LDO Mode Output | 4.2 V at up to 1.2 A when Ts ≥2.7 V - enables system power delivery without battery insertion during test |
| I²C Interface | Standard-mode (400 kHz), 7-bit slave address 0x47 - allows dynamic reconfiguration of charge parameters in-system |
Pinout & Package
LP3947ISDX-51/NOPB uses a 14-pin WSON (NHL0014B) package with exposed thermal pad. Pin pitch is 0.5 mm; body size is 3.5 mm × 3.5 mm × 0.8 mm. Thermal performance requires PCB land pattern with soldered thermal pad and ≥4 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Charger Enable Input | Active-high enable; internally pulled high to CHG-IN; <4 µA shutdown current when low |
| 2 SCL | I²C Clock Input | Drives serial interface timing; accepts 0.3×VDD to 0.7×VDD logic thresholds per TI spec |
| 3 SDA | I²C Data I/O | Open-drain bidirectional data line; supports repeated START/STOP and ACK/NACK protocol |
| 4 BATT | Battery Supply Terminal | Connects to Li-ion anode; requires 10 µF ceramic capacitor to GND for stability |
| 5 VT | Thermistor Bias Reference | 2.787 V regulated output for RT/RS thermistor network - sets temperature window |
| 6 VBSENSE | Battery Voltage Sense | High-impedance input tied to battery positive; enables accurate regulation independent of trace resistance |
| 7 MODE | Power Source Selector | LOW = USB mode (100/500 mA); HIGH = AC adaptor mode (500 mA default, up to 750 mA) |
| 8 Diff-Amp | Charge Current Monitor | Analog output (0.583–1.790 V) proportional to ICHG across internal 120 mΩ sense resistor |
| 9 Ts | Temp Sense / LDO Mode | Multi-function: monitors thermistor voltage (1.39–2.43 V) or triggers LDO mode when ≥2.7 V |
| 10 EOC | End-of-Charge Indicator | Active-low open-drain output asserted when battery reaches 4.2 V and ICHG ≤0.1C |
| 11 GND | Ground Reference | Primary return path for charge current, I²C, and internal regulators - must be low-impedance plane |
| 12 CHG | Charging Active Indicator | Active-low open-drain output asserted during pre-qual, CC, or CV phases - drives red LED |
| 13 ISEL | USB Current Select | LOW selects 500 mA USB mode; HIGH defaults to 100 mA - overrides I²C setting in USB mode |
| 14 CHG-IN | Input Power Source | Accepts 4.3–6.0 V from USB or AC adaptor; requires 1 µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Pass Transistor | Eliminates external MOSFET and gate driver - reduces BOM count and layout area in compact portable designs |
| Programmable Charge Parameters | I²C-configurable charge current (100–750 mA), battery voltage (4.1/4.2 V), and EOC threshold (0.1C/0.15C/0.2C) |
| Near-Depleted Battery Preconditioning | 70 mA max pre-charge until VBATT ≥3.0 V - safely recovers deeply discharged Li-ion cells without thermal stress |
| Dual-Mode Operation | Seamless transition between charger mode (VBATT < VCHG-IN) and LDO mode (Ts ≥2.7 V, up to 1.2 A at 4.2 V) |
| Comprehensive Protection | UVLO (3.6–4.3 V), OVLO (5.7–5.9 V), thermal shutdown (160 °C), and 5.6-hr timer - meets IEC 62368-1 safety requirements |
Applications
| Smartphone Charging System | USB-Powered Portable Instrument |
|---|---|
|
Use Scenario: Charging single-cell Li-ion battery from USB port or wall adapter in handheld communication device with thermal monitoring and LED status feedback. IC Role / Device Role / Timing Role: Primary battery management IC handling pre-charge, CC/CV regulation, EOC detection, and dual-status LED drive. Use Value: Enables safe, standards-compliant USB charging (100/500 mA modes) while supporting higher-current AC charging - eliminates need for separate USB switch or charge controller. |
Use Scenario: Powering lab-grade portable measurement equipment from USB-C host or AC source with battery backup and runtime diagnostics. IC Role / Device Role / Timing Role: Dual-role power manager providing regulated 4.2 V battery charge and 1.2 A LDO output for system rail during battery-less testing. Use Value: Allows field technicians to operate instrument without battery using Ts-pin LDO mode - simplifies calibration and reduces downtime. |
| Digital Camera Battery Charger | Programmable Current Source Module |
|
Use Scenario: Fast-charging high-capacity Li-ion packs in DSLR/mirrorless cameras with temperature-compensated termination and maintenance top-off. IC Role / Device Role / Timing Role: Precision charge controller implementing 4.2 V regulation, 0.1C EOC, and 200 mV maintenance restart threshold. Use Value: Extends usable battery capacity by 3–5% versus fixed-threshold chargers through accurate CV-phase current monitoring via Diff-Amp output. |
Use Scenario: Configurable benchtop current source for battery characterization, LED driver evaluation, or sensor biasing requiring stable 100–750 mA output. IC Role / Device Role / Timing Role: Programmable current sink/source using internal sense resistor and I²C-controlled DAC-like current setting. Use Value: Delivers calibrated current with ±10% accuracy (≥200 mA) and analog monitor output - replaces discrete op-amp/current-sense solutions. |
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 | Fixed 4.2 V regulation; no I²C interface; 1.5 A max charge current; integrated USB current limit (100/500 mA) | Best for cost-sensitive USB-only designs where programmability is unnecessary and higher current is required | Select BQ24075RGTR when I²C control is not needed and 1.5 A charge current justifies larger solution size |
| MAX1555ESA+ | Fixed 4.2 V; no I²C; 280 mA max charge current; thermal foldback instead of hard shutdown; no LDO mode | Suitable for ultra-low-power accessories where 280 mA suffices and thermal robustness is prioritized over flexibility | Choose MAX1555ESA+ for space-constrained wearables needing minimal external components and passive thermal protection |
Compared with LP3947ISDX-51/NOPB, BQ24075RGTR offers higher current but lacks I²C configurability and LDO mode, while MAX1555ESA+ provides simpler thermal management at lower current and no programmability - making LP3947ISDX-51/NOPB optimal for mid-range portable devices requiring runtime parameter tuning and dual-mode operation.
Availability
LP3947ISDX-51/NOPB is available at Aetrix Electronics and suitable for smartphone charging systems, USB-powered portable instruments, digital camera battery chargers, and programmable current source modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP3947ISDX-51/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 power management technologies with over 50 years of innovation in energy-efficient electronics.
The LP3947ISDX-51/NOPB belongs to TI's battery management IC product line, designed specifically for USB/AC-powered portable devices requiring safe, programmable single-cell Li-ion charging with integrated protection and system-level power flexibility.
FAQ
What is the default battery regulation voltage for LP3947ISDX-51/NOPB?
The LP3947ISDX-51/NOPB is factory-programmed for 4.2 V battery regulation voltage, as indicated by the "51" suffix in the part number per TI's ordering table. This value is confirmed in the Electrical Characteristics section under VBATT for 4.2V Cell, with ±1% accuracy over −40°C to +85°C junction temperature. The LP3947ISDX-51/NOPB retains this setting unless modified via I²C register 0x00.
How does the Ts pin determine LDO mode versus charging mode in LP3947ISDX-51/NOPB?
The Ts pin serves as both temperature monitor and LDO mode selector. When Ts voltage is between 1.39 V and 2.43 V, LP3947ISDX-51/NOPB operates in normal charging mode. If Ts ≥2.7 V (e.g., pulled to VT or left floating), the LP3947ISDX-51/NOPB enters LDO mode, disabling charging and sourcing up to 1.2 A at 4.2 V from CHG-IN to BATT. Voltages outside 1.39–2.43 V suspend charging for safety.
Can LP3947ISDX-51/NOPB charge at 500 mA from a USB port?
Yes - LP3947ISDX-51/NOPB supports 500 mA USB charging when the ISEL pin is driven LOW, as specified in Table 2 of the datasheet. By default (ISEL HIGH), it operates at 100 mA in USB mode. The MODE pin must be LOW to select USB mode, and CHG-IN must be supplied with 4.3–6.0 V from a compliant USB source. This capability is unique to LP3947ISDX-51/NOPB among TI's USB-charge portfolio.
What protection features are built into LP3947ISDX-51/NOPB?
LP3947ISDX-51/NOPB integrates under-voltage lockout (3.6–4.3 V), over-voltage lockout (5.7–5.9 V), thermal shutdown (160 °C), continuous over-current limiting, and a 5.6-hour safety timer. It also monitors battery temperature via the Ts pin and suspends charging if voltage falls outside 1.39–2.43 V - corresponding to typical 0–50 °C thermistor ranges. These protections are active in both charger and LDO modes.
Is LP3947ISDX-51/NOPB compatible with I²C buses operating at 100 kHz?
Yes - LP3947ISDX-51/NOPB supports standard-mode I²C (up to 100 kHz) and fast-mode I²C (up to 400 kHz), as verified in the Electrical Characteristics table for I²C Interface. Its SCL/SDA inputs meet standard I²C voltage thresholds (VIH = 0.7×VDD, VIL = 0.3×VDD), and timing parameters (tHOLD, tSU, tCLK-LP) comply with both modes. The LP3947ISDX-51/NOPB responds to 7-bit address 0x47 in either configuration.
LP3947ISDX-51/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 750mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- I2C, USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-WSON (4x4)
LP3947ISDX-51/NOPB FAQ
1.How can I place an order for LP3947ISDX-51/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3947ISDX-51/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 LP3947ISDX-51/NOPB reliable?
The price and inventory of LP3947ISDX-51/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3947ISDX-51/NOPB is usually 5 days.
3.What payment methods are accepted for LP3947ISDX-51/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3947ISDX-51/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3947ISDX-51/NOPB?
LP3947ISDX-51/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3947ISDX-51/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 LP3947ISDX-51/NOPB?
For technical support, including LP3947ISDX-51/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3947ISDX-51/NOPB requirements.
6.How does Aetrix verify that LP3947ISDX-51/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3947ISDX-51/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 LP3947ISDX-51/NOPB meets industry standards.
7.What is the process for return or replacement of LP3947ISDX-51/NOPB?
All LP3947ISDX-51/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3947ISDX-51/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 LP3947ISDX-51/NOPB part is unused and in its original packaging.
Return procedure for LP3947ISDX-51/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3947ISDX-51/NOPB Tags
-
BQ21040DBVR
Texas Instruments
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