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Texas Instruments LM2757TM/NOPB
- Part No.:
- LM2757TM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM2757TM/NOPB.pdf
- Description:
- IC REG CHARGE PUMP PROG 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,456
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Product details
Overview
LM2757TM/NOPB from Texas Instruments is a constant-frequency switched-capacitor boost regulator delivering regulated 4.1 V (100 mA), 4.5 V (110 mA), or 5 V (180 mA) output without inductors. It uses dual-gain charge-pump architecture (2×/1.5×), operates at 1.242 MHz, and features true input-output disconnect in shutdown - enabling USB OTG and HDMI power-sharing applications.
For engineers reviewing the LM2757TM/NOPB datasheet, LM2757TM/NOPB pinout, LM2757TM/NOPB application, or LM2757TM/NOPB equivalent, key selection criteria include output voltage selectability via M0/M1 logic inputs, high-impedance shutdown behavior, ceramic-capacitor-only implementation, and thermal/overcurrent protection with soft-start.
Technical Context
The LM2757TM/NOPB implements a two-phase, non-overlapping switched-capacitor topology using external flying capacitors C1 and C2 to transfer charge between VIN and VOUT. Gain switching (2× ↔ 1.5×) occurs automatically based on input voltage and selected output mode - e.g., 5 V mode transitions at ~3.9 V, minimizing input current ripple and maximizing efficiency across wide VIN ranges.
Pre-regulation control modulates internal MOSFET gate drive to limit charge transfer per cycle, reducing output voltage ripple. Internal 450-kΩ pulldown resistors on M0/M1 enable default shutdown when un-driven, while soft-start limits inrush current over 300 µs and thermal shutdown engages at 145°C (typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage options | 4.1 V (±2.8%), 4.5 V (±2.1%), or 5 V (±2.6%) - selectable via M0/M1 logic pins |
| Max output current | 180 mA at 5 V - enables direct Li-ion-to-5-V conversion for USB peripherals |
| Switching frequency | 1.242 MHz (±25%) - supports use of small 0.47 µF flying and 1 µF bulk ceramic capacitors |
| Input voltage range | 2.7 V to 5.5 V - compatible with single-cell Li-ion, Li-polymer, and USB bus supplies |
| Shutdown supply current | 1.1–2 µA - preserves battery life in standby; output enters high-impedance state |
| Quiescent current | 1.3–2.79 mA - low no-load consumption across all output modes |
| Output voltage ripple | 20 mVp–p at 150 mA (5 V mode) - minimized by pre-regulation and fixed-frequency operation |
| Protection features | Integrated overcurrent (250 mA typ.) and thermal shutdown (145°C trip) - no external components required |
Pinout & Package
LM2757TM/NOPB is housed in a 12-pin DSBGA (YFQ) package measuring 1.641 mm × 1.581 mm with 0.4-mm pitch - optimized for ultra-compact portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | C2+ | Flying capacitor C2 positive connection - part of 2-phase charge-transfer path |
| A2 | VOUT | Regulated output voltage node - presents high impedance during shutdown |
| A3 | C1+ | Flying capacitor C1 positive connection - alternates charge/discharge with C2 |
| B1 | C1− | Flying capacitor C1 negative connection - completes C1 charge/discharge loop |
| B2, B3 | VIN | Input voltage supply - dual pins reduce trace resistance and improve thermal performance |
| C1, C2 | GND | Ground reference - dual ground pins enhance noise immunity and thermal dissipation |
| C3 | C2− | Flying capacitor C2 negative connection - completes C2 charge/discharge loop |
| D1 | NC | No-connect bump - must remain floating; not internally bonded |
| D2 | M1 | Mode select logic input - with M0, sets output voltage or shutdown (450-kΩ internal pulldown) |
| D3 | M0 | Mode select logic input - with M1, selects 4.1 V, 4.5 V, 5 V, or shutdown state |
Key Features
| Feature | Design Value |
|---|---|
| Dual-gain charge pump (2× / 1.5×) | Automatically switches gain to maintain >93% efficiency across input voltage range |
| Inductorless design | Uses only four small ceramic capacitors - eliminates EMI, size, and cost penalties of inductors |
| High-impedance shutdown | VOUT floats during shutdown - allows external supply (e.g., USB host) to back-drive rail in OTG mode |
| Total solution area < 12 mm² | Enables integration into space-constrained mobile PCBs - including SIM card slots and keypad modules |
| True input-output disconnect | Internal switches isolate VIN from VOUT and VOUT from GND in shutdown - prevents reverse current |
| Integrated soft-start | Ramps VOUT to target in 300 µs - avoids inrush current stress on input source and load capacitance |
Applications
| USB/USB-OTG Power | Supercapacitor Charger |
|---|---|
Use Scenario: Providing regulated 5 V to USB peripherals from a single-cell Li-ion battery in smartphone or tablet accessories. IC Role / Device Role / Timing Role: Boost regulator with bidirectional rail control - supplies power during device-host mode and yields control during host-peripheral mode. Use Value: Enables seamless USB OTG functionality without external power-path controllers or additional FETs. | Use Scenario: Charging a supercapacitor bank from a low-voltage energy-harvesting source or backup battery. IC Role / Device Role / Timing Role: Pre-regulated charge pump - delivers stable current-limited output to avoid overvoltage during slow-charge phases. Use Value: Eliminates need for discrete op-amp + FET charging circuits; supports programmable voltage termination via M0/M1. |
| Keypad LED Drive | Audio Amplifier Power Supply |
Use Scenario: Driving white LEDs in membrane keypads or status indicators in industrial handhelds. IC Role / Device Role / Timing Role: Low-noise, high-efficiency boost converter - powers LEDs directly from 3.3 V or 3.6 V system rail. Use Value: Delivers consistent brightness across battery discharge curve; 20 mVp–p ripple prevents visible LED flicker. | Use Scenario: Supplying clean 4.5 V bias to Class AB or Class D audio amplifiers in portable speakers or headsets. IC Role / Device Role / Timing Role: Low-ripple, fast-transient power source - maintains amplifier PSRR and minimizes audible noise. Use Value: 1.242 MHz switching avoids AM radio band interference; ceramic-only design eliminates inductor-induced magnetic coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60403DBVR | Fixed 5 V output; 60 mA max; 1-MHz switching; SOIC-8 package | Lacks voltage selectability and high-current capability - suitable only for low-power logic rails | Choose TPS60403DBVR only if fixed 5 V/60 mA suffices and board space permits SOIC-8 footprint. |
| MAX8646ETA+ | Adjustable output (2.5–5.5 V); 200 mA; 1.2-MHz; 12-pin TDFN; requires external feedback resistors | Higher flexibility but adds BOM count and layout complexity - no integrated shutdown isolation | Select MAX8646ETA+ when adjustable output and higher current are needed, accepting added resistor network and no native high-Z shutdown. |
Compared with LM2757TM/NOPB, TPS60403DBVR offers lower cost but sacrifices programmability and current drive, while MAX8646ETA+ provides wider output adjustability at the expense of external components and missing true output disconnect - making LM2757TM/NOPB optimal for compact, OTG-aware, multi-voltage embedded systems.
Availability
LM2757TM/NOPB is available at Aetrix Electronics and suitable for USB OTG power delivery, keypad LED drive, supercapacitor charging, and audio amplifier biasing requiring stable component supply and long-term production continuity.
Supply support for LM2757TM/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 ICs - with decades of expertise in high-efficiency DC/DC conversion.
The LM2757TM/NOPB belongs to TI's switched-capacitor regulator product line, designed specifically for space-constrained, battery-powered applications needing inductorless, low-noise, multi-voltage boost capability - especially where rail sharing (e.g., USB OTG) is critical.
FAQ
What output voltages does the LM2757TM/NOPB support, and how are they selected?
The LM2757TM/NOPB supports three regulated output voltages: 4.1 V, 4.5 V, and 5 V - selected via logic states on M0 and M1 pins per Table 1 in the datasheet. A logic-low on both pins places LM2757TM/NOPB in shutdown with high-impedance VOUT. Internal 450-kΩ pulldown resistors ensure safe default behavior when pins are un-driven.
Does the LM2757TM/NOPB require an inductor, and what external components are mandatory?
No, the LM2757TM/NOPB is an inductorless switched-capacitor boost regulator requiring only four external ceramic capacitors: two flying capacitors (C1, C2 = 0.47 µF) and two bulk capacitors (CIN, COUT = 1 µF). All must be low-ESR MLCCs (X5R/X7R dielectric); tantalum or electrolytic types are not recommended due to high ESR.
How does the LM2757TM/NOPB behave during shutdown, and why is this important for USB OTG?
During shutdown (M0 = M1 = low), LM2757TM/NOPB disables internal switches and presents high impedance at VOUT - allowing an external supply (e.g., USB host VBUS) to safely drive the same rail. This enables USB On-The-Go functionality without risk of backfeed or contention, a key differentiator versus standard regulators.
What is the maximum continuous output current of the LM2757TM/NOPB, and under what conditions?
The LM2757TM/NOPB delivers up to 180 mA continuously at 5 V output, 110 mA at 4.5 V, and 100 mA at 4.1 V - all specified over –30°C to +85°C ambient, with VIN = 3 V to 5.5 V and proper PCB thermal design. Current limit is internally set to 250 mA (typical), protecting against short-circuit faults.
Can the LM2757TM/NOPB operate from a 2.7 V input, and what impact does low VIN have on efficiency?
Yes, LM2757TM/NOPB operates down to 2.7 V input. At low VIN (e.g., <3.35 V in 4.5 V mode), it defaults to 2× gain, increasing input current draw but maintaining regulation. Efficiency remains >85% across most of the operating range, peaking near 93% when G × VIN ≈ VOUT - verified in Figures 1–3 of the datasheet.
LM2757TM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 4.1V, 4.5V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 180mA
- Frequency - Switching:
- 1.242MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM2757TM/NOPB FAQ
1.How can I place an order for LM2757TM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2757TM/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 LM2757TM/NOPB reliable?
The price and inventory of LM2757TM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2757TM/NOPB is usually 5 days.
3.What payment methods are accepted for LM2757TM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2757TM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2757TM/NOPB?
LM2757TM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2757TM/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 LM2757TM/NOPB?
For technical support, including LM2757TM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2757TM/NOPB requirements.
6.How does Aetrix verify that LM2757TM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2757TM/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 LM2757TM/NOPB meets industry standards.
7.What is the process for return or replacement of LM2757TM/NOPB?
All LM2757TM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2757TM/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 LM2757TM/NOPB part is unused and in its original packaging.
Return procedure for LM2757TM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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