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Texas Instruments LM2787TPX/NOPB
- Part No.:
- LM2787TPX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-UFBGA
- Datasheet:
-
LM2787TPX/NOPB.pdf
- Description:
- IC REG CHRG PUMP ADJ 10MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
LM2787TPX/NOPB from Texas Instruments is a regulated switched-capacitor voltage inverter IC that inverts and regulates input supply voltage to deliver low-noise negative output between −1.5V and −5.2V, operates at 260 kHz switching frequency, draws only 400 µA quiescent current, and supports up to 10 mA output current for cellular phone power amplifier biasing.
For engineers reviewing the LM2787TPX/NOPB datasheet, LM2787TPX/NOPB pinout, LM2787TPX/NOPB application, or LM2787TPX/NOPB equivalent, key selection criteria include adjustable negative regulation range, DSBGA-8 package footprint, shutdown current of 0.05 µA, 91% typical charge-pump efficiency at 10 mA, and feedback-based output setting via external resistor divider.
Technical Context
The LM2787TPX/NOPB integrates a fixed-frequency 260 kHz switched-capacitor inverter stage followed by a low-dropout linear regulator to suppress ripple and noise. Its feedback pin (VFB) maintains a precise −1.20 V reference, enabling programmable output via external resistors between VOUT, VFB, and VADJ.
It features active-low logic-level shutdown (SD), which disconnects internal switches and grounds both VOUT and VNEG while reducing supply current to 0.05 µA. The device uses four external capacitors (C1–C3 + bypass) and requires ≤0.3 Ω ESR ceramic/tantalum/polymer types for optimal noise and regulation performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.7 V to +5.5 V - supports single-cell Li-ion and dual-cell alkaline/battery-powered systems. |
| Output Voltage Range | −1.5 V to −5.2 V - adjustable via external resistor divider on VFB pin with −1.20 V reference. |
| Max Output Current | 10 mA - sufficient for GaAsFET biasing and low-power interface rails. |
| Switching Frequency | 260 kHz (typical) - balances capacitor size, output resistance, and ripple suppression. |
| Quiescent Current | 400 µA - enables long battery life in always-on portable instrumentation. |
| Shutdown Current | 0.05 µA (typical) - minimizes standby drain during system sleep modes. |
| Output Ripple | 1 mV (at 2.5 mA, −2.7 V) - low enough for sensitive RF amplifier bias without additional filtering. |
Pinout & Package
LM2787TPX/NOPB is housed in an 8-bump DSBGA (Die Size Ball Grid Array) package measuring 1.5 mm × 1.5 mm × 0.6 mm, optimized for ultra-compact portable designs and requiring NSMD (non-solder-mask-defined) PCB pads per AN1112.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Cap+ | Positive terminal of flying capacitor C1 - connects to internal charge-pump switch node. |
| B1 | VIN | Positive input supply rail - powers both charge-pump and LDO stages. |
| C1 | VOUT | Regulated negative output - delivers stable, low-noise bias after LDO filtering. |
| C2 | VFB | Feedback input - senses output via resistor divider; held at −1.20 V reference. |
| C3 | SD | Active-low shutdown control - pulls VOUT/VNEG to GND when asserted. |
| B3 | VNEG | Unregulated negative output - raw inverted voltage pre-LDO; used only if regulation not required. |
| A3 | Cap− | Negative terminal of flying capacitor C1 - completes charge-transfer path. |
| A2 | GND | Analog ground reference - common return for VIN, VFB, SD, and output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO post-regulation | Reduces charge-pump ripple by PSRR; enables clean −1.5 V to −5.2 V outputs without external LDO. |
| Fixed 260 kHz oscillator | Eliminates external timing components; ensures consistent EMI profile and predictable capacitor sizing. |
| Logic-level shutdown | Enables system-level power sequencing with standard CMOS-compatible control signals. |
| Low 400 µA operating current | Extends battery runtime in handheld instrumentation where continuous negative bias is required. |
| DSBGA-8 footprint | Minimizes board area vs. SOIC/TSSOP alternatives - critical for space-constrained RF front-ends. |
Applications
| Cellular Phone Power Amplifier Biasing | Wireless Communication Systems |
|---|---|
Use Scenario: Providing stable negative gate bias to GaAsFET power amplifiers in GSM/UMTS/LTE handsets. IC Role / Device Role / Timing Role: Regulated negative voltage source delivering precise, low-noise −2.7 V to −3.8 V at ≤10 mA. Use Value: Enables high-efficiency RF power amplification with minimal AM-to-PM distortion due to low 1 mV ripple. | Use Scenario: Generating clean negative supply for analog front-end ICs in Bluetooth/Wi-Fi modules and baseband processors. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supplying regulated −3.3 V or −5.0 V for op-amp bias and ADC reference rails. Use Value: Maintains signal integrity in RF receivers by suppressing supply-induced noise coupling into sensitive analog paths. |
| Interface Power Supplies | Handheld Instrumentation |
Use Scenario: Powering RS-232 transceivers or LVDS drivers requiring dual-rail supplies in portable test equipment. IC Role / Device Role / Timing Role: Compact, capacitor-based negative rail generator replacing discrete charge-pump + LDO solutions. Use Value: Reduces BOM count and PCB area while meeting ±5 V interface compliance with <1 mV p-p ripple. | Use Scenario: Supplying negative bias to precision op-amps and sensor signal-conditioning circuits in battery-powered multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise, shutdown-capable inverter supporting intermittent measurement cycles. Use Value: Extends battery life via 0.05 µA shutdown current and maintains DC accuracy with <5 mV/mA load regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated negative voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Unregulated inverter; no LDO stage; fixed −2×VIN output; higher 100 µA quiescent current. | Lacks output adjustability and ripple suppression - suitable only where unregulated −5.4 V is acceptable. | Select MAX680ESA+ only if cost sensitivity outweighs need for regulation and noise performance. |
| TPS60403DBVR | Regulated inverter with −1.5 V to −5.5 V range; 2.5 MHz switching; 60 µA quiescent current; SOT-23-6 package. | Higher switching frequency allows smaller capacitors but increases EMI sensitivity; less suitable for RF-bias-critical layouts. | Choose TPS60403DBVR when board space permits SOT-23 and higher-frequency operation is acceptable. |
Compared with MAX680ESA+ and TPS60403DBVR, LM2787TPX/NOPB uniquely combines DSBGA-8 miniaturization, 260 kHz EMI-optimized switching, and integrated LDO ripple rejection - making it optimal for GaAsFET bias in antenna-proximate RF sections.
Availability
LM2787TPX/NOPB is available at Aetrix Electronics and suitable for cellular phone power amplifier biasing, wireless communication systems, and handheld instrumentation requiring stable component supply across extended production lifecycles.
Supply support for LM2787TPX/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability power conversion.
The LM2787TPX/NOPB belongs to TI's regulated charge-pump inverter product line, designed specifically for low-noise, space-constrained negative bias generation in portable RF and instrumentation applications.
FAQ
What is the function of the VFB pin on the LM2787TPX/NOPB?
The VFB pin on the LM2787TPX/NOPB is the feedback input for the internal LDO regulator and is held at a precise −1.20 V reference voltage. It must be connected to an external resistor divider between VOUT and a stable adjust voltage (VADJ), typically ground, to set the regulated output voltage within the −1.5 V to −5.2 V range. Leaving VFB unconnected will cause regulation failure and unstable output in the LM2787TPX/NOPB.
Can the LM2787TPX/NOPB operate from a 2.5 V input supply?
No, the LM2787TPX/NOPB requires a minimum input voltage of +2.7 V per its absolute operating range specification. At 2.5 V, the device may fail to start, exhibit poor regulation, or drop out of regulation entirely - especially when delivering >5 mA. Valid input range for reliable operation of the LM2787TPX/NOPB remains strictly +2.7 V to +5.5 V.
What happens to VOUT and VNEG during shutdown of the LM2787TPX/NOPB?
When the SD pin is pulled low, the LM2787TPX/NOPB enters shutdown mode: internal switches disconnect, and both VOUT and VNEG are actively shorted to GND. This prevents floating outputs and ensures defined logic states in downstream circuitry. Shutdown current drops to 0.05 µA typical, preserving battery life while maintaining safe bias conditions in the LM2787TPX/NOPB.
Which capacitor types are recommended for use with the LM2787TPX/NOPB?
The LM2787TPX/NOPB requires ceramic, surface-mount chip tantalum, or polymer electrolytic capacitors with ≤0.3 Ω ESR and minimum 1.0 µF capacitance for C1, C2, and C3. Ceramic capacitors are preferred for lowest ESR and smallest footprint. Higher-value or lower-ESR capacitors further reduce output resistance and ripple, directly improving regulation and noise performance in the LM2787TPX/NOPB.
Is the LM2787TPX/NOPB suitable for automotive applications?
The LM2787TPX/NOPB is specified for −40°C to +85°C ambient operation and is not AEC-Q200 qualified. While it may function in non-safety-critical automotive infotainment or accessory modules, TI does not designate it for under-hood or safety-related automotive use. For such applications, designers should select AEC-Q200–qualified alternatives instead of relying on the LM2787TPX/NOPB.
LM2787TPX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-UFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -1.5V
- Voltage - Output (Max):
- -5.2V
- Current - Output:
- 10mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA
LM2787TPX/NOPB FAQ
1.How can I place an order for LM2787TPX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2787TPX/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 LM2787TPX/NOPB reliable?
The price and inventory of LM2787TPX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2787TPX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2787TPX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2787TPX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2787TPX/NOPB?
LM2787TPX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2787TPX/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 LM2787TPX/NOPB?
For technical support, including LM2787TPX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2787TPX/NOPB requirements.
6.How does Aetrix verify that LM2787TPX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2787TPX/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 LM2787TPX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2787TPX/NOPB?
All LM2787TPX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2787TPX/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 LM2787TPX/NOPB part is unused and in its original packaging.
Return procedure for LM2787TPX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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