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Texas Instruments LM2770SD-12157/NOPB
- Part No.:
- LM2770SD-12157/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2770SD-12157/NOPB.pdf
- Description:
- IC REG CHARGE PUMP PROG 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,577
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Product details
Overview
LM2770SD-12157/NOPB from Texas Instruments is a switched capacitor step-down DC/DC regulator with dual-output-voltage capability (1.2V/1.575V), dynamic VSEL control, sleep-mode LDO bypass, and 250mA output current. It operates from 2.7V–5.5V input and delivers >85% peak efficiency using multi-gain PFM regulation. Designed for portable baseband and DSP power supplies in Li-ion–powered systems.
For engineers reviewing the LM2770SD-12157/NOPB datasheet, LM2770SD-12157/NOPB pinout, LM2770SD-12157/NOPB application, or LM2770SD-12157/NOPB equivalent, key selection criteria include its WSON-10 package footprint, ±3% output voltage accuracy across temperature, 55µA full-power quiescent current, and seamless transition between charge-pump and low-noise LDO operation under light loads.
Technical Context
The LM2770SD-12157/NOPB implements a pulse-frequency-modulated (PFM) fractional multi-gain charge pump with three discrete gains (⅓, ½, ⅔) selected dynamically to maximize efficiency across 2.7V–5.5V input and 0–250mA load ranges. Its internal non-overlapping clock drives two external flying capacitors (C1, C2) in alternating charge/hold phases.
Sleep mode disables the charge pump and activates an integrated low-noise LDO delivering up to 20mA at 1.2V or 1.575V with 50–65µA quiescent current. VSEL and SLEEP pins provide independent logic-level control of output voltage selection and regulation topology, enabling system-level dynamic power scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion battery operation across full discharge curve. |
| Output Voltage Options | 1.2V / 1.575V - selectable via VSEL pin; ±3% accuracy over -30°C to +105°C junction range. |
| Max Output Current | 250mA - delivered by charge-pump mode; 20mA max in sleep-mode LDO bypass. |
| Peak Efficiency | >85% - achieved using adaptive gain switching (G = ⅓, ½, ⅔) and PFM regulation. |
| Quiescent Current | 55µA (full-power), 50–65µA (sleep mode), 0.1–0.5µA (shutdown) - enables ultra-low-power standby. |
| Switching Frequency | 475–925kHz - PFM-variable frequency reduces light-load ripple and EMI. |
| Protection Features | Short-circuit protection (400mA typ.), current limit in sleep mode (60mA), thermal shutdown (150°C). |
Pinout & Package
LM2770SD-12157/NOPB uses the WSON-10 package (3mm × 3mm × 0.8mm) with exposed die-attach pad (DAP) for thermal dissipation. Pin numbering follows TI's standard top-view layout with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VSEL | Logic-select input: high = 1.575V output, low = 1.2V output; compatible with 1.8V logic levels. |
| 2 | EN | Enable input: high = active regulation, low = shutdown (0.1–0.5µA ISD); internal 300kΩ pull-down. |
| 3 | C2+ | Positive terminal of flying capacitor C2 - connects to internal switch array during charge phase. |
| 4 | GND | Power and signal ground reference - tied to exposed DAP for thermal and electrical integrity. |
| 5 | C2- | Negative terminal of flying capacitor C2 - completes charge-transfer path in two-phase pump cycle. |
| 6 | VOUT | Regulated output node - supplies load directly from charge pump or sleep-mode LDO. |
| 7 | C1- | Negative terminal of flying capacitor C1 - forms second half of dual-capacitor charge-transfer network. |
| 8 | C1+ | Positive terminal of flying capacitor C1 - driven by internal switches synchronized with C2 terminals. |
| 9 | VIN | Main input supply - accepts 2.7V–5.5V with recommended 10µF ceramic input capacitor. |
| 10 | SLEEP | Mode-select input: high = LDO-only operation (low noise, ≤20mA), low = full-power charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-gain PFM architecture | Three fractional gains (⅓, ½, ⅔) automatically selected to maintain >82% average efficiency across Li-ion input range (3.0–4.2V). |
| Dual-output dynamic scaling | VSEL pin toggles between 1.2V and 1.575V outputs in <40µs without external components or sequencing delays. |
| Sleep-mode LDO bypass | Integrated low-noise linear regulator activated by SLEEP pin; delivers stable 1.2V/1.575V at ≤20mA with 50–65µA IQ. |
| Soft-start protection | 200µs typical output ramp-up prevents inrush current on VIN/EN startup; eliminates need for external soft-start circuitry. |
| Robust protection suite | Includes short-circuit (400mA), sleep-mode current limit (60mA), thermal shutdown (150°C), and ESD-rated I/O (2kV HBM). |
Applications
| Baseband Processor Power | DSP Core Supply |
|---|---|
|
Use Scenario: Powering cellular baseband ICs (e.g., Qualcomm MDM series) requiring dual-voltage rails for modem and RF interface sections. IC Role / Device Role / Timing Role: Primary step-down regulator providing dynamically scaled 1.2V/1.575V outputs synchronized to processor activity states. Use Value: Reduces system power by lowering core voltage during idle; maintains 1.575V only during burst transmission, cutting average IIN by up to 22% vs. fixed 1.575V operation. |
Use Scenario: Supplying TI C6000 or Analog Devices SHARC DSPs with tightly regulated, low-noise voltage during compute-intensive tasks. IC Role / Device Role / Timing Role: Dual-mode regulator: charge-pump for active computation (250mA), LDO bypass for low-noise standby (≤20mA). Use Value: Eliminates switching ripple during sleep intervals while retaining fast wake-up response (<200µs), improving ADC SNR by ≥3dB in mixed-signal applications. |
| Mobile Phone Application Processor | Portable Medical Sensor Hub |
|
Use Scenario: Delivering scalable core voltage to ARM-based application processors (e.g., Snapdragon, Exynos) in smartphones and tablets. IC Role / Device Role / Timing Role: System-level voltage scaler responding to DVFS commands via VSEL and SLEEP pins to match CPU frequency/voltage profiles. Use Value: Enables real-time voltage transitions aligned with OS scheduler events, reducing dynamic power by 18–30% versus fixed-output regulators. |
Use Scenario: Powering ultra-low-power biosensor signal chains (ECG, SpO₂) where EMI and noise must be minimized during patient monitoring. IC Role / Device Role / Timing Role: Primary power source operating in LDO sleep mode during sensor sampling intervals; charge-pump engaged only for data transmission bursts. Use Value: Achieves <10µVRMS output noise in sleep mode while maintaining 250mA headroom for BLE/Wi-Fi radio activation - critical for clinical-grade signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27762DSGT | Single 1.8V output; no VSEL/SLEEP pins; higher 300mA IOUT; 92% peak efficiency; WSON-12 package. | Lacks dynamic voltage scaling and sleep-mode LDO - suitable only for fixed-voltage, higher-current designs. | Select when system requires >250mA at one voltage and board space allows WSON-12 footprint. |
| TPS60403DBVR | Fixed 3.3V output; 60mA IOUT; no VSEL/SLEEP; 85% efficiency; SOT-23-5 package. | Lower current, no voltage flexibility, no sleep mode - limited to auxiliary low-power rails. | Choose only for cost-sensitive, low-current auxiliary supplies where dual-voltage and sleep features are unnecessary. |
Compared with LM2770SD-12157/NOPB, LM27762DSGT offers higher current but sacrifices voltage flexibility and sleep-mode noise reduction, while TPS60403DBVR provides minimal functionality in a smaller package at the cost of scalability and system-level power optimization.
Availability
LM2770SD-12157/NOPB is available at Aetrix Electronics and suitable for mobile phone baseband power, DSP core supply, portable medical sensor hubs, and other applications requiring stable component supply with guaranteed long-term availability.
Supply support for LM2770SD-12157/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 leadership in high-efficiency DC/DC conversion.
The LM2770SD-12157/NOPB belongs to TI's switched-capacitor regulator product line, engineered specifically for ultra-low-noise, dynamically scalable power in space-constrained portable electronics powered by single-cell batteries.
FAQ
What output voltage options does the LM2770SD-12157/NOPB support?
The LM2770SD-12157/NOPB supports two precise output voltage pairs: 1.2V and 1.575V. These are selected dynamically using the VSEL logic input - high logic level selects 1.575V, low selects 1.2V. Both voltages maintain ±3% accuracy across -30°C to +105°C junction temperature and full 0–250mA load range, as verified in TI's SNVS318E datasheet Electrical Characteristics tables.
How does the LM2770SD-12157/NOPB manage efficiency across varying input voltages?
The LM2770SD-12157/NOPB uses a fractional multi-gain charge pump with automatic selection among ⅓, ½, and ⅔ gains based on real-time VIN and VOUT conditions. This architecture maintains >82% average efficiency across the full 3.0–4.2V Li-ion input range at 200mA, as shown in Figure 7 of the SNVS318E datasheet. Gain transitions occur seamlessly without external control or timing constraints.
What is the role of the SLEEP pin on the LM2770SD-12157/NOPB?
The SLEEP pin on the LM2770SD-12157/NOPB controls topology selection: logic-high activates a low-noise bypass LDO delivering up to 20mA at 1.2V or 1.575V with 50–65µA quiescent current; logic-low enables full-power charge-pump operation for up to 250mA. This dual-mode capability eliminates switching noise during standby while preserving fast wake-up response (<200µs).
Can the LM2770SD-12157/NOPB operate from a 2.7V input?
Yes, the LM2770SD-12157/NOPB is fully specified to operate from 2.7V minimum input voltage, supporting deep discharge of single-cell Li-ion batteries. At VIN = 2.7V and IOUT = 150mA, the device maintains 1.575V output within ±3% tolerance (1.520V–1.630V) in sleep mode and delivers 250mA in full-power mode per the SNVS318E datasheet Operating Ratings and Electrical Characteristics tables.
What external capacitors are required for the LM2770SD-12157/NOPB?
The LM2770SD-12157/NOPB requires four external MLCCs: CIN and COUT (10µF each), and two flying capacitors C1 and C2 (1.0µF each). TI recommends X5R/X7R dielectrics (e.g., TDK C2012X5R0J106M) with ≤15mΩ ESR. Y5V/Z5U types are explicitly discouraged due to severe DC-bias capacitance loss and temperature drift that degrade regulation and ripple performance.
LM2770SD-12157/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- 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):
- 1.2V, 1.58V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM2770SD-12157/NOPB FAQ
1.How can I place an order for LM2770SD-12157/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2770SD-12157/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 LM2770SD-12157/NOPB reliable?
The price and inventory of LM2770SD-12157/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2770SD-12157/NOPB is usually 5 days.
3.What payment methods are accepted for LM2770SD-12157/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2770SD-12157/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2770SD-12157/NOPB?
LM2770SD-12157/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2770SD-12157/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 LM2770SD-12157/NOPB?
For technical support, including LM2770SD-12157/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2770SD-12157/NOPB requirements.
6.How does Aetrix verify that LM2770SD-12157/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2770SD-12157/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 LM2770SD-12157/NOPB meets industry standards.
7.What is the process for return or replacement of LM2770SD-12157/NOPB?
All LM2770SD-12157/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2770SD-12157/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 LM2770SD-12157/NOPB part is unused and in its original packaging.
Return procedure for LM2770SD-12157/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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