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Texas Instruments LM2757TMX/NOPB
- Part No.:
- LM2757TMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM2757TMX/NOPB.pdf
- Description:
- IC REG CHARGE PUMP PROG 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:11,109
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Product details
Overview
LM2757TMX/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 (2×/1.5×) charge-pump architecture, operates at 1.242 MHz, and provides true input-output disconnect with high-impedance shutdown - ideal for USB-OTG power arbitration and Li-ion-to-5V conversion in space-constrained portable devices.
For engineers reviewing the LM2757TMX/NOPB datasheet, LM2757TMX/NOPB pinout, LM2757TMX/NOPB application, or LM2757TMX/NOPB equivalent, key selection criteria include output voltage mode select logic (M0/M1), shutdown leakage current (<1 µA at –30°C), 12-pin DSBGA package footprint (1.641 mm × 1.581 mm), and ceramic capacitor count (only four required: CIN, COUT, C1, C2).
Technical Context
The LM2757TMX/NOPB implements a two-phase, non-overlapping 1.242-MHz charge pump with automatic gain switching between 2× and 1.5× based on VIN and selected VOUT mode. Pre-regulation controls MOSFET gate drive to minimize output ripple, while internal soft-start limits inrush current during turn-on (300 µs typical).
It integrates overcurrent protection (250 mA short-circuit limit), thermal shutdown (145°C trip), and 450-kΩ internal pulldown resistors on M0/M1 pins. Shutdown places VOUT in high-impedance state, enabling external supply back-driving - critical for USB-OTG host negotiation and HDMI hot-plug scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage options | 4.1 V (100 mA), 4.5 V (110 mA), or 5 V (180 mA) - selected via M0/M1 logic inputs |
| Switching frequency | 1.242 MHz - enables use of small 0.47 µF flying capacitors and low-ESR MLCCs |
| Input voltage range | 2.7 V to 5.5 V - supports single-cell Li-ion, Li-polymer, and USB bus inputs |
| Shutdown supply current | 1.1–2 µA - ensures minimal battery drain when disabled |
| Output voltage ripple | 20 mVp–p max at 150 mA (5 V mode) - achieved via pre-regulated gain control and 1.242-MHz switching |
| Thermal shutdown threshold | 145°C (typical) - protects against sustained overload or poor PCB thermal design |
| Package | 12-pin DSBGA (YFQ), 1.641 mm × 1.581 mm - ultra-compact for thin mobile PCBs |
Pinout & Package
LM2757TMX/NOPB is housed in a 12-pin, 0.4-mm pitch DSBGA (YFQ) package measuring 1.641 mm × 1.581 mm. The bottom-side ball layout follows standard DSBGA pin mapping with GND balls on C1/C2 and NC on D1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | C2+ | Flying capacitor C2 positive terminal - connects to internal switch array phase 1 |
| A2 | VOUT | Regulated output - high-impedance during shutdown; drives load or external supply back-drive path |
| A3 | C1+ | Flying capacitor C1 positive terminal - connects to internal switch array phase 1 |
| B1 | C1− | Flying capacitor C1 negative terminal - connects to internal switch array phase 2 |
| B2/B3 | VIN | Input power supply - dual pins reduce IR drop and improve thermal path |
| C1/C2 | GND | Ground reference - dual ground balls enhance return path integrity and thermal dissipation |
| C3 | C2− | Flying capacitor C2 negative terminal - connects to internal switch array phase 2 |
| D1 | NC | No-connect bump - must remain floating; not internally bonded |
| D2 | M1 | Logic input - selects output voltage mode with M0; 450-kΩ internal pulldown |
| D3 | M0 | Logic input - selects output voltage mode with M1; 450-kΩ internal pulldown |
Key Features
| Feature | Design Value |
|---|---|
| Dual-gain charge pump (2×/1.5×) | Automatically transitions gain to maximize efficiency: e.g., 2× below 3.9 V (5 V mode), 1.5× above - keeps G×VIN close to VOUT |
| True output disconnect in shutdown | VOUT enters high-impedance state with <1 µA leakage at –30°C - enables safe USB-OTG role swapping |
| Inductorless design | Uses only four 0603-size ceramic capacitors (CIN, COUT, C1, C2) - eliminates EMI, size, and cost of magnetic components |
| Pre-regulated switching | Controls MOSFET gate drive to limit charge transfer per cycle - reduces output ripple to 20 mVp–p without post-regulation |
| Integrated protection | Includes thermal shutdown (145°C), overcurrent limiting (250 mA), and soft-start (300 µs ramp) - no external circuitry needed |
Applications
| USB/USB-OTG Power | Supercapacitor Charger |
|---|---|
Use Scenario: Mobile device acting as USB OTG host, requiring 5 V on VBUS while powered by a single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Boost regulator providing regulated 5 V output with high-impedance shutdown to allow peripheral-supplied VBUS during device enumeration. Use Value: Eliminates need for separate VBUS switch or LDO; enables seamless role swap using same physical port and routing. | Use Scenario: Charging a 5.5-V supercapacitor from a 3.3-V system rail in energy-harvesting sensor nodes. IC Role / Device Role / Timing Role: Constant-frequency switched-capacitor charger delivering up to 180 mA at 5 V with controlled inrush and thermal safety. Use Value: Achieves full 5.5-V charge without inductor saturation risk or magnetic component aging effects. |
| Keypad LED Drive | Audio Amplifier Power Supply |
Use Scenario: Driving white LEDs for keypad backlight in feature phones with tight height constraints. IC Role / Device Role / Timing Role: Low-noise, high-efficiency boost converter supplying 4.5 V at 110 mA to parallel LED strings. Use Value: Delivers consistent brightness across battery discharge (2.7–4.2 V input) with <20 mVp–p ripple - avoids visible LED flicker. | Use Scenario: Providing clean 5 V bias to Class AB audio amplifier IC in Bluetooth headset. IC Role / Device Role / Timing Role: Ripple-suppressed boost regulator powering analog audio stage with minimal PSRR degradation. Use Value: 1.242-MHz switching places ripple beyond audible band; pre-regulation ensures <20 mVp–p noise at amplifier input. |
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; 600-kHz switching; requires five external capacitors; no high-Z shutdown | Lacks mode-select logic and true output disconnect - unsuitable for USB-OTG arbitration | Choose for fixed 5-V, lower-cost designs where shutdown isolation is unnecessary |
| MAX889TEUK+T | Fixed 5-V output; 1-MHz switching; 125-mA output; no gain switching or thermal shutdown | Lower current capability and missing protection features limit use to low-power auxiliary rails | Choose for space-constrained, low-current applications where full protection and mode flexibility are not required |
Compared with TPS60403DBVR and MAX889TEUK+T, LM2757TMX/NOPB uniquely combines selectable output voltage, automatic gain optimization, high-impedance shutdown, and integrated thermal/current protection - making it the only option qualified for USB-OTG host negotiation and robust Li-ion boost in production mobile designs.
Availability
LM2757TMX/NOPB is available at Aetrix Electronics and suitable for USB-OTG power arbitration, supercapacitor charging, and keypad LED drive applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2757TMX/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 specializing in analog, embedded processing, and digital signal processing technologies, with leadership in power management innovation.
The LM2757TMX/NOPB belongs to TI's switched-capacitor DC/DC converter product line, designed specifically for inductorless, ultra-compact boost regulation in battery-powered portable electronics where board area and EMI are critical constraints.
FAQ
What output voltage options does the LM2757TMX/NOPB support, and how are they selected?
The LM2757TMX/NOPB supports three regulated output voltages: 4.1 V, 4.5 V, and 5 V. Selection is performed using the logic states of the M0 and M1 pins per Table 1 in the datasheet: M0=1/M1=1 → 4.1 V; M0=1/M1=0 → 4.5 V; M0=0/M1=1 → 5 V. The LM2757TMX/NOPB enters shutdown (high-Z VOUT) when both M0 and M1 are low. Internal 450-kΩ pulldowns ensure defined states when un-driven.
How does the LM2757TMX/NOPB achieve high efficiency without an inductor?
The LM2757TMX/NOPB achieves up to 93% efficiency using a dual-gain (2×/1.5×) switched-capacitor architecture that dynamically adjusts charge transfer per cycle based on input voltage and selected output mode. By operating at 1.242 MHz and employing pre-regulated gate drive to limit MOSFET conduction, it minimizes switching losses and ripple without magnetic components. Efficiency peaks when G×VIN closely matches VOUT - e.g., 1.5× gain at VIN ≥3.9 V in 5 V mode.
What is the purpose of the high-impedance shutdown mode in the LM2757TMX/NOPB?
The high-impedance shutdown mode in the LM2757TMX/NOPB disconnects VOUT from both input and internal circuitry, allowing an external supply (e.g., USB peripheral VBUS) to safely drive the same node. This is essential for USB On-The-Go (OTG) host/peripheral role negotiation and HDMI hot-plug detection. Leakage into VOUT remains below 1 µA at –30°C, ensuring minimal loading during arbitration - a core differentiator of the LM2757TMX/NOPB versus fixed-output charge pumps.
Which external capacitors are required for the LM2757TMX/NOPB, and what are their roles?
The LM2757TMX/NOPB requires exactly four external ceramic capacitors: CIN (1 µF input reservoir), COUT (1 µF output filter), C1 (0.47 µF flying capacitor), and C2 (0.47 µF flying capacitor). CIN stabilizes VIN during charge phases; COUT sets output ripple magnitude; C1 and C2 alternately transfer charge between VIN and VOUT under 1.242-MHz control. All must be low-ESR X7R/X5R MLCCs - Y5V/Z5U types are prohibited due to severe DC-bias capacitance loss.
Does the LM2757TMX/NOPB include built-in protection features, and if so, which ones?
Yes, the LM2757TMX/NOPB integrates three key protections: (1) Overcurrent limiting - clamps output current to 250 mA (typical) during short-circuit events; (2) Thermal shutdown - disables operation at 145°C (typical) and re-enables at 135°C (typical); (3) Soft-start - ramps VOUT over 300 µs (typical) to prevent input inrush. These functions require no external components and are active across all output voltage modes - a verified capability confirmed in Section 8.3 of the LM2757TMX/NOPB datasheet.
LM2757TMX/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 (1.64x1.24)
LM2757TMX/NOPB FAQ
1.How can I place an order for LM2757TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2757TMX/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 LM2757TMX/NOPB reliable?
The price and inventory of LM2757TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2757TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2757TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2757TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2757TMX/NOPB?
LM2757TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2757TMX/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 LM2757TMX/NOPB?
For technical support, including LM2757TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2757TMX/NOPB requirements.
6.How does Aetrix verify that LM2757TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2757TMX/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 LM2757TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2757TMX/NOPB?
All LM2757TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2757TMX/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 LM2757TMX/NOPB part is unused and in its original packaging.
Return procedure for LM2757TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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