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Texas Instruments LP3907SQX-TJXIP/NOPB
- Part No.:
- LP3907SQX-TJXIP/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LP3907SQX-TJXIP/NOPB.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,820
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Product details
Overview
LP3907SQX-TJXIP/NOPB from Texas Instruments is a programmable power management IC integrating two synchronous buck converters (1 A and 600 mA), two 300-mA LDOs, and an I²C interface - designed for FPGA, DSP, and application processor core/I/O rail sequencing. It operates from 2.8 V to 5.5 V input, delivers ±3% output voltage accuracy, supports dynamic voltage scaling, and features programmable power-on reset with delay.
For engineers reviewing the LP3907SQX-TJXIP/NOPB datasheet, LP3907SQX-TJXIP/NOPB pinout, LP3907SQX-TJXIP/NOPB application, or LP3907SQX-TJXIP/NOPB equivalent, this device is selected for multi-rail battery-powered systems requiring precise sequencing, light-load efficiency via PWM-to-PFM mode, and host-controlled regulation of core and I/O voltages in compact WQFN-24 packaging.
Technical Context
The LP3907SQX-TJXIP/NOPB implements two independent synchronous buck regulators with 2.1-MHz fixed-frequency PWM operation and automatic transition to PFM at light loads, enabling >96% peak efficiency. Each buck includes internal MOSFETs (200 mΩ PFET / 180 mΩ NFET), soft-start, and feedback loop compensation via external resistors on FB1/FB2 pins.
Its dual LDOs use PMOS pass devices with 30-mV typical dropout at 50 mA, support 1 V–3.5 V programmable outputs (default: LDO1 = 1.8 V, LDO2 = 2.5 V), and are controlled via dedicated enable pins (ENLDO1/ENLDO2) and I²C registers. The integrated 400-kHz I²C interface enables real-time voltage adjustment, sequencing control, and status monitoring including Power Good (nPOR) assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V to 5.5 V - supports single-cell Li-ion, USB, or regulated 3.3 V/5 V rails without external pre-regulation. |
| Buck1 Output | 0.8 V–2 V @ 1 A - configurable for FPGA core or processor VDD, with ±3% accuracy over line/load/temperature. |
| Buck2 Output | 1 V–3.5 V @ 600 mA - suitable for memory I/O or peripheral rails; default set to 3.3 V per orderable option. |
| LDO Outputs | 1 V–3.5 V @ 300 mA each - low-noise (80 µVrms), low-dropout (30 mV typ.) supplies for analog or sensitive logic blocks. |
| I²C Interface | 400 kHz standard-mode - enables host MCU to configure voltages, enable/disable rails, read status, and manage sequencing. |
| Switching Frequency | 2.1 MHz (typ.) - allows use of small 2.2-µH inductors and 10-µF ceramic output capacitors for compact layout. |
| Thermal Protection | 160°C shutdown with 20°C hysteresis - prevents damage during overload or poor PCB thermal design. |
Pinout & Package
LP3907SQX-TJXIP/NOPB is housed in a thermally enhanced 4.00 mm × 4.00 mm WQFN-24 package (RTW) with exposed DAP for improved heat dissipation. Pin 1 is located at top-left corner (A1); DAP must be connected to GND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Buck1 input power | Accepts 2.8–5.5 V supply; requires 10-µF input capacitor for stability and EMI reduction. |
| SW1 | Buck1 switch node | Connects to 2.2-µH inductor and 10-µF output capacitor; high dv/dt node requiring tight layout. |
| FB1 | Buck1 feedback input | Resistor divider from VOUT1 sets output voltage; internal reference is 0.6 V (±3%). |
| ENSW1 | Buck1 enable control | Logic-high active; overrides I²C control when used for hardware sequencing. |
| LDO1 | LDO1 regulated output | Delivers up to 300 mA at user-programmed voltage (default 1.8 V); low noise for analog circuits. |
| ENLDO1 | LDO1 enable control | Logic-high active; allows independent on/off control of LDO1 via GPIO or I²C register. |
| SDA / SCL | I²C bidirectional data / clock | 400-kHz interface for full configuration and monitoring; requires 4.7-kΩ pull-ups to AVDD. |
| nPOR | Open-drain Power Good | Asserts low when Buck1/Buck2 outputs are within 94% of target; 50-ms default delay after regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Scaling (DVS) | Real-time I²C-adjustable buck outputs enable adaptive power management for processors during varying workload states. |
| PWM-to-PFM Light-Load Mode | Automatic transition reduces quiescent current to 33 µA (typ.), maintaining >85% efficiency at 100 µA load. |
| Programmable Power-On Reset | Configurable delay (001 = 50 ms) and threshold (94%/85%) ensure reliable system boot sequencing across all rails. |
| Integrated Thermal & Overcurrent Protection | Hardware-level shutdown at 160°C and current limiting (1.5 A Buck1 / 1 A Buck2) prevent fault propagation. |
| Low-Noise LDO Architecture | 80 µVrms output noise and 45 dB PSRR at 10 kHz support noise-sensitive analog circuits like ADCs or RF front-ends. |
Applications
| FPGA Core & I/O Power | DSP Processor Supply |
|---|---|
Use Scenario: Powering Xilinx Spartan or Intel Cyclone FPGA with separate 1.2-V core and 3.3-V I/O rails. IC Role / Device Role / Timing Role: LP3907SQX-TJXIP/NOPB provides sequenced, independently regulated outputs with nPOR coordination to meet FPGA startup timing requirements. Use Value: Eliminates discrete DC-DC + LDO combinations; reduces BOM count by 4+ components while enabling I²C-based voltage margining. |
Use Scenario: Supplying TI C6000 or Analog Devices SHARC DSP with dynamically scaled core voltage and fixed I/O voltage. IC Role / Device Role / Timing Role: LP3907SQX-TJXIP/NOPB executes DVS commands via I²C to adjust Buck1 output in real time during algorithm execution phases. Use Value: Achieves up to 30% reduction in active power vs. fixed-voltage supply, extending battery life in portable test equipment. |
| Portable Medical Instrumentation | Industrial Sensor Node |
Use Scenario: Powering hearing aid SoCs with ultra-low-noise analog rails and strict EMI limits. IC Role / Device Role / Timing Role: LP3907SQX-TJXIP/NOPB delivers clean 1.8-V LDO2 output (80 µVrms noise) and 2.5-V LDO1 for microphone bias, synchronized to buck sequencing. Use Value: Meets IEC 60601-1 EMI Class B limits without added filtering; avoids audible switching artifacts in audio path. |
Use Scenario: Enabling long-life battery operation in wireless vibration sensors with intermittent wake-up cycles. IC Role / Device Role / Timing Role: LP3907SQX-TJXIP/NOPB powers MCU (Buck1), RF transceiver (Buck2), and analog front-end (LDO1/LDO2) with hardware-enables and I²C sleep control. Use Value: Reduces system standby current to <1 µA via I²C-controlled shutdown of all regulators except AVDD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple buck (2×1 A + 1×600 mA) + dual LDO; no I²C, uses hardware pin-strapping for configuration. | Suitable for fixed-voltage systems without host control; lacks DVS and programmable POR delay. | Select when cost sensitivity outweighs need for software configurability and sequencing flexibility. |
| MAX8646ETE+ | Dual buck (1.5 A + 1.5 A) + triple LDO; I²C interface but no integrated POR generator or nPOR pin. | Requires external POR circuitry; higher buck current rating but larger 5×5 mm TQFN package. | Choose for higher-current applications where board space permits larger footprint and external sequencing logic. |
Compared with TPS65023RSBR and MAX8646ETE+, the LP3907SQX-TJXIP/NOPB uniquely combines I²C-configurable DVS, hardware nPOR signaling, and WQFN-24 compactness - making it optimal for space-constrained, host-managed embedded systems requiring precise rail coordination.
Availability
LP3907SQX-TJXIP/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, portable medical instrumentation, industrial sensor nodes, and battery-backed measurement units requiring stable component supply and long-term production continuity.
Supply support for LP3907SQX-TJXIP/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, serving automotive, industrial, and communications markets with high-reliability components.
The LP3907 product line delivers highly integrated, I²C-programmable power management solutions for low-power FPGAs, DSPs, and application processors - emphasizing sequencing precision, light-load efficiency, and compact packaging for portable and space-constrained designs.
FAQ
What is the default output voltage configuration for LP3907SQX-TJXIP/NOPB?
The LP3907SQX-TJXIP/NOPB is factory-configured with Buck1 = 1.2 V, Buck2 = 3.3 V, LDO1 = 1.8 V, and LDO2 = 2.5 V. These defaults are stored in one-time-programmable (OTP) memory and can be overridden via I²C writes to the appropriate voltage control registers during system initialization.
Does LP3907SQX-TJXIP/NOPB support hardware-based power sequencing independent of I²C?
Yes, LP3907SQX-TJXIP/NOPB supports hardware sequencing using EN_T, ENSW1, ENSW2, ENLDO1, and ENLDO2 pins. The EN_T pin initiates a preset sequence that enables Buck1 → Buck2 → LDO1 → LDO2 with internal delays; individual rails can also be enabled/disabled directly via their dedicated EN pins without I²C involvement.
What is the maximum allowable input voltage for the LDO inputs (VINLDO1/VINLDO2) on LP3907SQX-TJXIP/NOPB?
The absolute maximum rating for VINLDO1 and VINLDO2 is 6 V, but the recommended operating range is 1.74 V to 5.5 V. These pins may be supplied from intermediate buck outputs (e.g., Buck1 at 1.2 V) due to their extended low-voltage capability - enabling cascaded regulation architectures.
How does the nPOR pin function on LP3907SQX-TJXIP/NOPB, and can its delay be modified?
The nPOR pin on LP3907SQX-TJXIP/NOPB is an open-drain output that asserts low until both Buck1 and Buck2 outputs reach ≥94% of their target voltages. Its default delay is 50 ms (encoded as "001" in the device options table), and this delay is factory-programmed - not modifiable via I²C or external components.
What thermal considerations apply to LP3907SQX-TJXIP/NOPB in continuous 1-A Buck1 operation?
Under continuous 1-A Buck1 load at 5.5-V input and 1.2-V output, LP3907SQX-TJXIP/NOPB dissipates ~4.3 W. With RθJA = 32.7°C/W (WQFN-24), ambient temperature must be limited to ≤65°C to maintain junction temperature below 125°C. Use of the exposed DAP pad tied to a 4-layer internal ground plane is essential for thermal reliability.
LP3907SQX-TJXIP/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 2.1MHz
- Voltage/Current - Output 1:
- 1.2V, 1A
- Voltage/Current - Output 2:
- 3.3V, 600mA
- Voltage/Current - Output 3:
- 1.8V, 300mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 2.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LP3907SQX-TJXIP/NOPB FAQ
1.How can I place an order for LP3907SQX-TJXIP/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3907SQX-TJXIP/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 LP3907SQX-TJXIP/NOPB reliable?
The price and inventory of LP3907SQX-TJXIP/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3907SQX-TJXIP/NOPB is usually 5 days.
3.What payment methods are accepted for LP3907SQX-TJXIP/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3907SQX-TJXIP/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3907SQX-TJXIP/NOPB?
LP3907SQX-TJXIP/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3907SQX-TJXIP/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 LP3907SQX-TJXIP/NOPB?
For technical support, including LP3907SQX-TJXIP/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3907SQX-TJXIP/NOPB requirements.
6.How does Aetrix verify that LP3907SQX-TJXIP/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3907SQX-TJXIP/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 LP3907SQX-TJXIP/NOPB meets industry standards.
7.What is the process for return or replacement of LP3907SQX-TJXIP/NOPB?
All LP3907SQX-TJXIP/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3907SQX-TJXIP/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 LP3907SQX-TJXIP/NOPB part is unused and in its original packaging.
Return procedure for LP3907SQX-TJXIP/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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