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Texas Instruments LM2771SD/NOPB
- Part No.:
- LM2771SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2771SD/NOPB.pdf
- Description:
- IC REG CHARGE PUMP 1.5V 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,915
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Product details
Overview
LM2771SD/NOPB from Texas Instruments is a switched capacitor step-down DC/DC converter that delivers a fixed 1.5V output without inductors, supports up to 250mA load current, operates from 2.7V–5.5V input, achieves 81% efficiency at 200mA from 3.6V input, and features 8mV output ripple at full load-ideal for space-constrained portable power rails in DSP and microprocessor applications.
For engineers reviewing the LM2771SD/NOPB datasheet, LM2771SD/NOPB pinout, LM2771SD/NOPB application, or LM2771SD/NOPB equivalent, key selection criteria include its 1.1MHz fixed-frequency + PFM hybrid regulation, WSON-10 package thermal performance (θJA = 55°C/W), shutdown disconnect functionality, and precise ±1.7% output voltage accuracy over 0–200mA load range.
Technical Context
The LM2771SD/NOPB implements a regulated 0.5× charge pump topology with non-overlapping internal clock control of external flying capacitor C1. It operates in three distinct modes: fixed-frequency pre-regulation above ~3.5V input, low-ripple PFM mode below ~30mA load, and pass-through mode below ~3.5V input-enabling high efficiency across wide VIN/IOUT ranges.
Its internal architecture includes soft-start (150µs typical), thermal shutdown (150°C trip), current limit (500mA typ), and EN-controlled logic-level shutdown with internal 350kΩ pull-down. The device uses only ceramic capacitors (CIN = 1µF, COUT = 4.7µF, C1 = 1µF) and requires no inductor, reducing solution size and EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V with ±1.7% accuracy over 0–200mA load and −30°C to +110°C junction temperature. |
| Max Output Current | 250mA continuous; current limit triggers at 500mA to protect internal switches during fault conditions. |
| Input Voltage Range | 2.7V to 5.5V operational; recommended 3.0V–5.5V per design validation; pass-mode active below ~3.5V. |
| Switching Frequency | 1.1MHz nominal (0.8–1.4MHz range); enables compact external capacitor sizing and low EMI filtering. |
| Output Ripple | 8mV peak-to-peak at 250mA load in fixed-frequency mode; 12mV in PFM mode below 40mA. |
| Efficiency | 81% at VIN = 3.6V, IOUT = 200mA; exceeds LDO efficiency by ~2× in buck-mode operation. |
| Quiescent Current | 50µA typical at zero load; drops to 0.5µA in shutdown mode via EN pin control. |
Pinout & Package
LM2771SD/NOPB is housed in a 3mm × 3mm × 0.8mm WSON-10 (DSC0010A) leadless package with exposed die-attach pad connected to GND for thermal dissipation. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Supplies 2.7–5.5V; requires 1µF low-ESR ceramic bypass capacitor placed adjacent to pin. |
| GND (Pins 2 & 9) | Ground Reference | Dual ground pins reduce impedance; both must be connected to low-inductance PCB ground plane. |
| VOUT | Regulated Output | Delivers fixed 1.5V; connects to 4.7µF output capacitor and load; disconnected from VIN in shutdown. |
| NC (Pins 4, 5, 8) | No Connect | Internally unconnected; must remain floating-no external connection or PCB trace required. |
| C1− / C1+ | Flying Capacitor Terminals | Interface external 1µF ceramic flying capacitor; polarity-sensitive-C1+ connects to internal switch node. |
| EN | Enable Control | Logic-high (>0.95×VIN) enables regulator; logic-low (<0.5V) forces shutdown with <0.5µA supply current. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI, enabling ultra-thin PCB designs for mobile and wearable devices. |
| Hybrid regulation (FF + PFM) | Maintains <8mV ripple at full load while dropping to PFM below 30mA to sustain >80% efficiency across entire 0–250mA range. |
| Shutdown disconnect | Completely isolates VOUT from VIN during EN = LOW, preventing backfeed and enabling true system-level power gating. |
| Thermal & current protection | Integrates auto-recovering thermal shutdown (150°C trip) and 500mA current limit-no external circuitry needed for robust operation. |
| ±1.7% output accuracy | Ensures stable core voltage for sensitive digital loads like DSPs and microprocessors without post-regulation trimming. |
Applications
| Mobile Phone Baseband Power | DSP Core Supply |
|---|---|
Use Scenario: Powers baseband processor core in GSM/UMTS handsets requiring clean, compact 1.5V rail from single Li-ion cell (3.6V). IC Role / Device Role / Timing Role: Primary step-down regulator replacing discrete LDO + inductor solutions; provides regulated 1.5V with <8mV ripple at 250mA peak current. Use Value: Reduces board area by 40% vs. inductor-based buck converters while maintaining low noise critical for RF coexistence. | Use Scenario: Supplies 1.5V core voltage to low-power DSPs in portable audio recorders and voice assistants. IC Role / Device Role / Timing Role: Fixed-output switched-capacitor converter operating in PFM mode during idle periods to minimize quiescent loss. Use Value: Achieves 81% efficiency at 200mA and <50µA IQ in active mode-extending battery life beyond LDO alternatives. |
| Microprocessor I/O Bank Supply | Memory Interface Rail |
Use Scenario: Generates 1.5V I/O supply for ARM Cortex-M series MCUs in industrial handheld terminals. IC Role / Device Role / Timing Role: Secondary power rail with fast transient response (150µs startup) and load-step stability per Figure 5. Use Value: Delivers 250mA with <20mV undershoot during 15mA→200mA load steps-ensuring reliable digital interface timing. | Use Scenario: Powers LPDDR2/LPDDR3 memory interfaces in tablets where space and thermal density are constrained. IC Role / Device Role / Timing Role: Low-noise, inductor-free DC/DC converter with 1.1MHz switching synchronized to avoid memory bus interference. Use Value: Provides 4.7µF-coupled output with 8mV ripple-meeting JEDEC AC timing margins without added ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60403DBVR | Fixed 3.3V output; 60mA max; 1MHz switching; SOT-23-5 package. | Lower current, higher output voltage-suitable only for low-power logic rails, not 1.5V core supplies. | Select when 3.3V/60mA is sufficient and board space demands SOT-23 footprint. |
| MAX881REUB+ | Adjustable output (1.2–5V); 100mA max; 1.2MHz; µMAX-10 package. | Requires external feedback resistors; limited current and thermal capability vs. LM2771SD/NOPB's 250mA rating. | Choose for adjustable output needs where 100mA suffices and WSON-10 thermal performance is not required. |
Compared with TPS60403DBVR and MAX881REUB+, the LM2771SD/NOPB offers 2.5× higher output current, fixed 1.5V precision, superior thermal dissipation in WSON-10, and integrated shutdown disconnect-making it uniquely suited for high-density 1.5V core power in portable electronics.
Availability
LM2771SD/NOPB is available at Aetrix Electronics and suitable for mobile phone baseband power, DSP core supply, microprocessor I/O bank supply, and memory interface rail applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for LM2771SD/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 decades of expertise in high-efficiency DC/DC conversion and portable power solutions.
The LM2771 product line was designed specifically for inductor-free, low-noise step-down conversion in space- and noise-sensitive portable electronics-targeting applications where traditional buck regulators introduce EMI or layout complexity.
FAQ
What is the recommended input capacitor for LM2771SD/NOPB?
The LM2771SD/NOPB requires a 1µF low-ESR ceramic capacitor (X5R/X7R) on the VIN pin, placed as close as possible to minimize input ripple and supply droop during charge-phase transitions. TDK C1005X5R1A105K is a validated option per TI's reference design. Larger values may reduce ripple further but require verification against startup behavior and layout parasitics.
Does LM2771SD/NOPB support adjustable output voltage?
No, LM2771SD/NOPB provides only a fixed 1.5V output. Its internal feedback network is trimmed to deliver ±1.7% accuracy across temperature and load without external resistors. For adjustable outputs, consider TI's LM2776 family or alternative manufacturers' programmable charge pumps-not the LM2771SD/NOPB.
How does LM2771SD/NOPB behave when input voltage drops below 3.5V?
Below ~3.5V input, LM2771SD/NOPB enters pass mode: the charge pump disables and the device operates like a low-dropout linear regulator with 1:1 voltage gain. Efficiency remains high (comparable to an LDO), output current capability is preserved, and regulation continues-though output voltage tracks VIN minus small dropout.
Can LM2771SD/NOPB drive a 250mA load continuously?
Yes, LM2771SD/NOPB is rated for continuous 250mA output under specified thermal conditions (TJ ≤ 110°C). This requires proper PCB layout: solid GND plane, thermal vias under the exposed die-attach pad, and ambient temperature ≤ 85°C. At 250mA and 3.6V input, junction temperature rise is ~28°C above ambient using θJA = 55°C/W.
What is the shutdown current of LM2771SD/NOPB?
The shutdown current of LM2771SD/NOPB is 0.5µA maximum when EN is pulled low (≤0.5V). During shutdown, VOUT is actively discharged to GND via internal resistors, ensuring no floating output. This ultra-low leakage supports battery-powered systems requiring multi-year shelf life and deep sleep states.
LM2771SD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM2771SD/NOPB FAQ
1.How can I place an order for LM2771SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2771SD/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 LM2771SD/NOPB reliable?
The price and inventory of LM2771SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2771SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2771SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2771SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2771SD/NOPB?
LM2771SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2771SD/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 LM2771SD/NOPB?
For technical support, including LM2771SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2771SD/NOPB requirements.
6.How does Aetrix verify that LM2771SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2771SD/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 LM2771SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2771SD/NOPB?
All LM2771SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2771SD/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 LM2771SD/NOPB part is unused and in its original packaging.
Return procedure for LM2771SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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