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Texas Instruments LM2787TP/NOPB
- Part No.:
- LM2787TP/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-UFBGA
- Datasheet:
-
LM2787TP/NOPB.pdf
- Description:
- IC REG CHRG PUMP ADJ 10MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,791
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Product details
Overview
LM2787TP/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 LM2787TP/NOPB datasheet, LM2787TP/NOPB pinout, LM2787TP/NOPB application, or LM2787TP/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 LM2787TP/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 stable output regulation across input voltages from +2.7 V to +5.5 V.
It uses four external capacitors (C1–C3 plus bypass), requires no inductor, and features active-low logic-level shutdown that disconnects internal switches and grounds both VOUT and VNEG. The device achieves <1 mV output ripple at 2.5 mA with specified 1 µF/0.3 Ω ESR ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable from −1.5 V to −5.2 V; set via external resistor divider on VFB pin with −1.20 V internal reference. |
| Input Voltage Range | +2.7 V to +5.5 V; supports single-cell Li-ion and dual-cell alkaline/battery-powered systems. |
| Max Output Current | 10 mA continuous; sufficient for GaAsFET biasing and low-power interface rails. |
| Switching Frequency | 260 kHz typical; enables use of small 1 µF ceramic capacitors and minimizes EMI vs. lower-frequency charge pumps. |
| Quiescent Current | 400 µA typical; ensures minimal battery drain in always-on portable subsystems. |
| Shutdown Current | 0.05 µA typical; reduces system standby power to near-zero during sleep modes. |
| Output Ripple | 1 mV typical at 2.5 mA load; achieved with 1 µF/0.3 Ω ESR capacitors and attenuated by LDO PSRR. |
Pinout & Package
LM2787TP/NOPB is housed in an 8-bump DSBGA (Die Size Ball Grid Array) package measuring 1.5 mm × 1.5 mm × 0.6 mm, with 0.5 mm ball pitch and NSMD (non-solder-mask-defined) pad layout per AN1112.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cap+ | Positive terminal of flying capacitor C1 | Connects to internal switch node driving C1 during charge phase; critical for charge transfer efficiency. |
| VIN | Positive power supply input | Supplies energy to charge pump; must be decoupled with ≥1 µF ceramic capacitor near package. |
| VOUT | Regulated negative output | Final clean output after LDO filtering; connects directly to load requiring low-noise negative bias. |
| VFB | Feedback input | Senses output via resistor divider; held at −1.20 V reference to enable precise output voltage programming. |
| SD | Active-low shutdown control | Drives internal switches off and shorts VOUT/VNEG to GND when logic low; compatible with 1.8 V/3.3 V GPIO. |
| VNEG | Unregulated negative output of charge pump | Raw inverted voltage pre-LDO; used only for internal regulation path - not intended as system output. |
| Cap− | Negative terminal of flying capacitor C1 | Completes flying capacitor loop; ties to internal switch node during discharge phase. |
| GND | Ground reference | Common return for VIN, VOUT, SD, and capacitor connections; requires low-impedance PCB plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO post-regulation | Reduces charge-pump ripple by >40 dB via high PSRR, delivering <1 mV noise at VOUT without external LC filters. |
| Logic-compatible shutdown | 0.05 µA shutdown current and 0.8 V/2.4 V VIH/VIL thresholds allow direct interfacing with standard digital I/Os. |
| Fixed 260 kHz oscillator | Enables consistent capacitor sizing and predictable EMI profile; eliminates need for external timing components. |
| DSBGA-8 ultra-small footprint | 1.5 mm × 1.5 mm area saves >70% board space vs. SOIC-8 alternatives while supporting automated reflow assembly. |
| −1.20 V precision feedback reference | Enables ±1% output accuracy with 1% resistors; eliminates need for trimming or calibration in production. |
Applications
| Cellular Phone Power Amplifier Biasing | Wireless Communication Systems |
|---|---|
Use Scenario: Providing stable negative gate bias to GaAsFET power amplifiers in GSM/UMTS handsets during transmit bursts. IC Role / Device Role / Timing Role: Regulated negative voltage source with fast transient response and ultra-low noise to prevent AM-to-PM distortion. Use Value: Enables >30 dBc adjacent channel leakage ratio (ACLR) compliance by suppressing switching artifacts below −70 dBV. | Use Scenario: Generating clean −3.3 V or −2.5 V rails for RF front-end ICs, mixers, and analog baseband processors in portable radios. IC Role / Device Role / Timing Role: Low-noise auxiliary supply generator replacing discrete inductor-based inverters in space-constrained modules. Use Value: Eliminates magnetic coupling and EMI from inductors, improving receiver sensitivity by 2–3 dB in co-located antenna designs. |
| Interface Power Supplies | Handheld Instrumentation |
Use Scenario: Supplying negative bias to RS-232 transceivers or op-amp rails in battery-powered data loggers and field testers. IC Role / Device Role / Timing Role: Compact, capacitor-only inverter delivering regulated negative voltage without inductor size or saturation concerns. Use Value: Supports true bipolar operation of instrumentation amplifiers with <10 µV p-p noise floor over 10 Hz–100 kHz bandwidth. | Use Scenario: Powering LCD contrast bias circuits and sensor signal conditioning stages in handheld multimeters and thermal imagers. IC Role / Device Role / Timing Role: Low-quiescent-current negative rail generator enabling multi-week battery life in intermittent-use devices. Use Value: Extends CR2032 coin-cell lifetime beyond 18 months by limiting average system current to <5 µA in standby mode. |
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 mV ripple; 125 kHz switching. | Lacks precision regulation and low-noise performance; suitable only where output tolerance >±10% is acceptable. | Select MAX680ESA+ only if cost is primary constraint and noise/ripple requirements are relaxed. |
| TPS60403DBVR | Regulated inverter with −1.5 V to −5.5 V range; 1 MHz switching; 2.5 µA quiescent current; SOT-23-6 package. | Higher IQ limits battery life in ultra-low-power apps; smaller package but no DSBGA option for ultra-dense layouts. | Choose TPS60403DBVR when faster transient response is needed and board space allows SOT-23 footprint. |
Compared with MAX680ESA+ and TPS60403DBVR, LM2787TP/NOPB uniquely balances ultra-low quiescent current (400 µA), integrated LDO noise suppression (<1 mV ripple), and DSBGA-8 miniaturization-making it optimal for GaAsFET biasing where size, noise, and battery life are simultaneously critical.
Availability
LM2787TP/NOPB is available at Aetrix Electronics and suitable for cellular phone power amplifier biasing, wireless communication systems, and handheld instrumentation requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LM2787TP/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 90 years of innovation in high-reliability electronic components.
The LM2787TP/NOPB belongs to TI's regulated charge-pump inverter product line, designed specifically for low-noise, capacitor-only negative voltage generation in portable RF and battery-powered systems.
FAQ
What is the minimum input voltage required for stable operation of the LM2787TP/NOPB?
The LM2787TP/NOPB requires a minimum input voltage of +2.7 V to maintain regulation across its full output range. Below this threshold, output voltage may drop out of specification, especially under load. At VIN = 2.7 V and VOUT = −1.5 V, the device sustains 10 mA output with ≤50 mV dropout, verified per Electrical Characteristics Table.
Can the LM2787TP/NOPB generate −5.0 V output from a 3.3 V input?
Yes, the LM2787TP/NOPB can generate −5.0 V from a 3.3 V input using the external resistor divider on the VFB pin. With VFB = −1.20 V reference, R1/R2 values are calculated per datasheet Equation (1); for −5.0 V output, R1/R2 ≈ 3.17. This configuration is validated in TI's typical application circuit and operates within line/load regulation specs.
What capacitor types and values are recommended for optimal performance of the LM2787TP/NOPB?
TI specifies 1.0 µF ceramic capacitors with ≤0.3 Ω ESR for C1, C2, and C3. Larger values (e.g., 2.2 µF) further reduce output resistance and ripple. Tantalum or polymer electrolytic caps are acceptable if ESR remains ≤0.3 Ω. Avoid aluminum electrolytics due to high ESR and temperature drift.
Does the LM2787TP/NOPB require special PCB layout considerations for the DSBGA-8 package?
Yes - the LM2787TP/NOPB DSBGA-8 demands NSMD pads per AN1112, 0.5 mm ball pitch, and thermal relief on GND connections. Keep VIN and VOUT traces short and wide; place C1 within 2 mm of Cap+/Cap− balls; avoid routing high-speed signals under the package to prevent light-induced misoperation.
How does the shutdown function affect the VOUT and VNEG pins of the LM2787TP/NOPB?
When SD is pulled low, the LM2787TP/NOPB disables all internal switches and actively pulls both VOUT and VNEG to GND through internal MOSFETs. This ensures no floating negative voltage remains at the output, preventing unintended biasing of downstream circuitry during system sleep states.
LM2787TP/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
LM2787TP/NOPB FAQ
1.How can I place an order for LM2787TP/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2787TP/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 LM2787TP/NOPB reliable?
The price and inventory of LM2787TP/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2787TP/NOPB is usually 5 days.
3.What payment methods are accepted for LM2787TP/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2787TP/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2787TP/NOPB?
LM2787TP/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2787TP/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 LM2787TP/NOPB?
For technical support, including LM2787TP/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2787TP/NOPB requirements.
6.How does Aetrix verify that LM2787TP/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2787TP/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 LM2787TP/NOPB meets industry standards.
7.What is the process for return or replacement of LM2787TP/NOPB?
All LM2787TP/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2787TP/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 LM2787TP/NOPB part is unused and in its original packaging.
Return procedure for LM2787TP/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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