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Texas Instruments LM2787BP/NOPB
- Part No.:
- LM2787BP/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-VFBGA
- Datasheet:
-
LM2787BP/NOPB.pdf
- Description:
- IC REG CHARG PUMP ADJ 10MA 8USMD
- Quantity:
- Payment:
- Shipping:
Inventory:3,193
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Product details
Overview
LM2787BP/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 LM2787BP/NOPB datasheet, LM2787BP/NOPB pinout, LM2787BP/NOPB application, or LM2787BP/NOPB equivalent, this device is selected for low-noise negative rail generation in space-constrained portable electronics where EMI-sensitive analog biasing, shutdown-controlled power sequencing, and DSBGA footprint efficiency are critical design requirements.
Technical Context
The LM2787BP/NOPB integrates a fixed-frequency (260 kHz typical) charge-pump inverter stage followed by a low-dropout linear regulator to suppress ripple and improve PSRR. Its feedback pin (VFB) maintains a precise −1.20 V reference, enabling adjustable output via external resistor divider tied to VADJ (0 V to VIN).
It features active-low logic-level shutdown (SD), which reduces supply current to 0.05 µA and grounds both VOUT and VNEG. The architecture delivers 91% typical power efficiency at 10 mA load while maintaining <1 mV output ripple at 2.5 mA with specified 1 µF/0.3 Ω ESR capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable from −1.5 V to −5.2 V; set by external resistor divider referencing −1.20 V at VFB. |
| Input Voltage Range | 2.7 V to 5.5 V; supports single-cell Li-ion and dual-cell alkaline battery systems without external regulation. |
| Switching Frequency | 260 kHz typical; enables compact 1 µF ceramic capacitor selection and minimizes EMI in RF-sensitive layouts. |
| Quiescent Current | 400 µA typical; ensures minimal battery drain during active operation in always-on portable subsystems. |
| Shutdown Current | 0.05 µA typical; allows deep-sleep power management in handheld instrumentation and wireless modems. |
| Output Ripple | 1 mV typical at 2.5 mA load; achieved via PSRR-enhanced LDO post-regulation of charge-pump output. |
| Max Output Current | 10 mA continuous; sufficient for GaAsFET PA biasing and low-power interface rails in cellular front-ends. |
Pinout & Package
LM2787BP/NOPB uses an 8-bump DSBGA (Die Size Ball Grid Array) package measuring 1.5 mm × 1.5 mm with 0.5 mm pitch, optimized for ultra-compact PCB layouts in mobile devices. Mounting requires NSMD (non-solder-mask-defined) 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 | Main positive input supply (2.7–5.5 V); powers both charge-pump and LDO stages. |
| C1 | VOUT | Regulated negative output; delivers low-noise, adjustable −1.5 V to −5.2 V after LDO filtering. |
| C2 | VFB | Feedback input referenced to −1.20 V; sets output voltage via resistor divider to VADJ. |
| C3 | SD | Active-low shutdown control; pulls VOUT/VNEG to GND and reduces IQ to 0.05 µA when asserted. |
| B3 | VNEG | Unregulated negative charge-pump output; used internally by LDO and accessible for auxiliary use. |
| A3 | Cap− | Negative terminal of flying capacitor C1; completes charge-transfer path during pump cycle. |
| A2 | GND | Analog ground reference for all internal circuitry; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO post-regulation | Reduces charge-pump ripple by >40 dB via high-PSRR linear stage, enabling clean GaAsFET biasing. |
| Fixed 260 kHz oscillator | Eliminates external timing components and ensures consistent EMI profile across temperature and voltage. |
| Logic-level shutdown | Enables seamless integration into host MCU GPIO-controlled power sequencing without level-shifting. |
| DSBGA footprint | 1.5 mm × 1.5 mm area saves >70% board space vs. SOIC-8 alternatives, critical for thin mobile form factors. |
| Low ESR capacitor support | Optimized for 1 µF ceramic caps with ≤0.3 Ω ESR, reducing BOM cost and improving transient response. |
Applications
| Cellular Phone Power Amplifier Biasing | Wireless Communication Systems |
|---|---|
Use Scenario: Providing stable, low-noise negative gate bias to GaAsFET power amplifiers in GSM/UMTS/LTE handset front-ends. IC Role / Device Role / Timing Role: Regulated negative voltage generator with fast start-up (<600 µs) and shutdown-controlled sequencing. Use Value: Enables >30 dB reduction in AM-to-PM distortion versus unregulated inverters, directly improving adjacent-channel leakage ratio (ACLR). |
Use Scenario: Generating isolated negative supply for RF transceiver I/Q mixers, IF amplifiers, and PLL VCO tuning lines. IC Role / Device Role / Timing Role: Low-ripple inverting DC/DC converter supporting multi-band, multi-mode radio architectures. Use Value: Maintains <1 mV ripple under dynamic load steps, preventing LO pulling and phase noise degradation in sensitive receivers. |
| Handheld Instrumentation | Laptop Computers and PDA's |
Use Scenario: Supplying precision negative reference for 12-bit+ SAR ADCs and op-amp signal conditioning in portable test equipment. IC Role / Device Role / Timing Role: Low-drift, low-noise auxiliary rail generator with shutdown for battery conservation between measurements. Use Value: Delivers <5 mV/mA load regulation and <1 mV/V line regulation, preserving measurement accuracy across battery discharge. |
Use Scenario: Powering RS-232 transceivers, LCD bias circuits, and smart battery fuel gauges requiring −3 V to −5 V rails. IC Role / Device Role / Timing Role: Compact, efficient inverter for legacy interface and display subsystems in space-constrained clamshell designs. Use Value: Achieves 91% efficiency at 10 mA while occupying <2.25 mm² PCB area-enabling dual-rail generation without discrete inductors. |
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, higher output ripple (>10 mV), fixed −2×VIN output. | Suitable only where noise immunity is non-critical and output voltage tracking is acceptable. | Select MAX680ESA+ only if cost sensitivity outweighs ripple and adjustability requirements. |
| TPS60403DBVR | Regulated inverter with 2.5 V to 5.5 V input, but fixed −3.3 V output and 1.5 mA max current. | Limited to low-current digital interface rails; cannot support 10 mA PA bias or adjustable voltage. | Choose TPS60403DBVR for simple, fixed −3.3 V generation in microcontroller peripherals where size and cost are primary. |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2787BP/NOPB uniquely combines adjustable output (−1.5 V to −5.2 V), 10 mA capability, and integrated LDO ripple suppression-making it the only option among the three qualified for GaAsFET amplifier biasing in production cellular handsets.
Availability
LM2787BP/NOPB is available at Aetrix Electronics and suitable for cellular phone power amplifier biasing, wireless communication systems, and handheld instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant DSBGA packaging.
Supply support for LM2787BP/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 delivering analog, embedded processing, and connectivity solutions with focus on reliability, performance, and broad application coverage.
The LM2787BP/NOPB belongs to TI's regulated charge-pump inverter product line, engineered specifically for low-noise, space-constrained negative rail generation in portable RF and precision analog systems.
FAQ
What is the minimum input voltage required for stable operation of the LM2787BP/NOPB?
The LM2787BP/NOPB requires a minimum input voltage of 2.7 V to maintain regulation across its full output range. Below this threshold, the internal charge-pump and LDO stages cannot sustain output voltage accuracy or ripple performance, and the device may enter dropout or fail to start. Operation at 2.7 V is validated over temperature and load per the datasheet's operating input voltage range specification.
How does the LM2787BP/NOPB achieve low output voltage ripple?
The LM2787BP/NOPB achieves low output voltage ripple through a two-stage architecture: first, a 260 kHz switched-capacitor inverter generates VNEG; second, an integrated low-dropout linear regulator filters that signal using high PSRR to attenuate switching artifacts. With 1 µF/0.3 Ω ESR capacitors, the LM2787BP/NOPB delivers 1 mV typical ripple at 2.5 mA-confirmed in Figure 10 of the SNVS080F datasheet.
Can the LM2787BP/NOPB generate a −3.3 V output?
Yes, the LM2787BP/NOPB can generate a precise −3.3 V output by configuring the external feedback resistor divider to set VFB = −1.20 V. Using Equation (1) from the datasheet with VADJ = GND, R1 = 1.78 MΩ and R2 = 1.0 MΩ yields −3.3 V at VOUT. This adjustment is fully supported across the device's −1.5 V to −5.2 V output range and validated over temperature.
What happens to VOUT and VNEG during shutdown of the LM2787BP/NOPB?
When the SD pin is pulled low, the LM2787BP/NOPB disables both the charge-pump and LDO stages and actively discharges VOUT and VNEG to GND through internal switches. This behavior is explicitly documented in the Shutdown section of the datasheet and ensures no floating negative rails remain during system sleep-critical for preventing latch-up in downstream analog circuitry.
Is the LM2787BP/NOPB compatible with standard 0.5 mm pitch DSBGA reflow profiles?
Yes, the LM2787BP/NOPB's 8-bump DSBGA package is compatible with standard lead-free reflow profiles per IPC/JEDEC J-STD-020. TI specifies NSMD pad design and recommends peak temperatures ≤260°C for 10 seconds. Mounting guidance-including stencil design and alignment ordinals-is detailed in Application Note AN1112 to ensure reliable solder joint formation and avoid voiding.
LM2787BP/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VFBGA
- 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-uSMD
LM2787BP/NOPB FAQ
1.How can I place an order for LM2787BP/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2787BP/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 LM2787BP/NOPB reliable?
The price and inventory of LM2787BP/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2787BP/NOPB is usually 5 days.
3.What payment methods are accepted for LM2787BP/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2787BP/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2787BP/NOPB?
LM2787BP/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2787BP/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 LM2787BP/NOPB?
For technical support, including LM2787BP/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2787BP/NOPB requirements.
6.How does Aetrix verify that LM2787BP/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2787BP/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 LM2787BP/NOPB meets industry standards.
7.What is the process for return or replacement of LM2787BP/NOPB?
All LM2787BP/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2787BP/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 LM2787BP/NOPB part is unused and in its original packaging.
Return procedure for LM2787BP/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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