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Texas Instruments LM2770SD-1215/NOPB
- Part No.:
- LM2770SD-1215/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2770SD-1215/NOPB.pdf
- Description:
- IC REG CHARGE PUMP PROG 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,967
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Product details
Overview
LM2770SD-1215/NOPB from Texas Instruments is a switched capacitor step-down DC/DC regulator with dual-output-voltage capability (1.2V/1.5V), dynamic VSEL control, sleep-mode LDO bypass, and 250mA output current capability. It operates from 2.7V to 5.5V input and delivers ±3% output voltage accuracy in portable baseband and DSP power supplies.
For engineers reviewing the LM2770SD-1215/NOPB datasheet, LM2770SD-1215/NOPB pinout, LM2770SD-1215/NOPB application, or LM2770SD-1215/NOPB equivalent, key selection considerations include multi-gain PFM efficiency optimization, VSEL-driven dynamic voltage scaling, sleep-mode LDO noise performance under ≤20mA loads, and WSON-10 thermal management at up to 105°C junction temperature.
Technical Context
The LM2770SD-1215/NOPB implements a pulse-frequency-modulated (PFM) charge pump with three fractional gains (⅓, ½, ⅔) selected dynamically to maximize efficiency across 2.7V–5.5V input and 0–250mA load ranges. Its core uses two external flying capacitors (C1, C2) and internal non-overlapping MOS switch arrays to transfer charge without inductors.
Sleep mode disables the charge pump and engages a low-noise, low-quiescent-current LDO (50–65µA ISLEEP) delivering up to 20mA; full-power mode provides up to 250mA with 55µA IQ and 475–925kHz switching frequency. Output voltage is selected via VSEL logic (high = 1.5V, low = 1.2V) with ±3% regulation accuracy over -30°C to +105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Pair | 1.2V / 1.5V - selectable via VSEL pin; enables dynamic power scaling for DSP/baseband subsystems |
| Max Output Current | 250mA - supports full-power operation of mobile baseband processors and RF ICs |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion batteries (3.0–4.2V nominal) and USB-powered systems |
| Efficiency Peak | >85% - achieved via multi-gain PFM architecture; exceeds LDO and fixed-gain charge pumps across wide VIN/IOUT range |
| Sleep Mode Supply Current | 50–65µA - enables ultra-low-power standby for pagers, wearables, and always-on sensors |
| Quiescent Current (Full Power) | 55µA - minimizes battery drain during light-load active operation |
| Switching Frequency | 475–925kHz - PFM-controlled; eliminates EMI concerns associated with fixed-frequency switching |
| Thermal Shutdown | 150°C (typ.) - protects against PCB layout-induced thermal stress in compact WSON-10 packages |
Pinout & Package
LM2770SD-1215/NOPB is housed in a 3mm × 3mm × 0.8mm WSON-10 package with exposed die-attach pad (DAP) for thermal dissipation. The 10-pin leadless frame features bottom-surface solder connections and requires controlled thermal profile reflow per TI SNOA401.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VSEL | Output voltage select logic input | High = 1.5V output; Low = 1.2V output; enables real-time DVFS in battery-constrained systems |
| 2 EN | Enable logic input | High = active regulation; Low = shutdown (0.1–0.5µA ISD); internal 300kΩ pull-down ensures default-off state |
| 3 C2+ | Flying capacitor 2 positive terminal | Connects to C2 anode; part of 2-phase charge transfer network enabling ⅓/½/⅔ gain modes |
| 4 GND | Power and signal ground reference | Primary return path for charge pump, LDO, and logic; must be low-impedance connection to DAP |
| 5 C2- | Flying capacitor 2 negative terminal | Connects to C2 cathode; complements C2+ in bidirectional charge transfer cycle |
| 6 VOUT | Regulated output voltage node | Delivers 1.2V or 1.5V to load; requires 10µF low-ESR ceramic capacitor (COUT) for ripple suppression |
| 7 C1- | Flying capacitor 1 negative terminal | Completes first flying capacitor path; works with C1+ to store and shuttle charge between VIN and VOUT |
| 8 C1+ | Flying capacitor 1 positive terminal | Connects to C1 anode; forms primary charge storage leg in multi-gain switched-capacitor topology |
| 9 VIN | Input supply voltage | Accepts 2.7–5.5V; requires 10µF low-ESR ceramic input capacitor (CIN) for stability and ripple filtering |
| 10 SLEEP | Sleep mode logic input | High = LDO-only operation (≤20mA, low-noise); Low = full-power charge pump mode (up to 250mA) |
Key Features
| Feature | Design Value |
|---|---|
| Multi-gain PFM charge pump | Three fractional gains (⅓, ½, ⅔) automatically selected to maintain >82% efficiency across full VIN/IOUT operating range |
| Dual-output dynamic voltage scaling | VSEL pin toggles regulated output between 1.2V and 1.5V without external components or firmware overhead |
| Sleep-mode LDO bypass | Integrated low-noise linear regulator activates at ≤20mA load, reducing output ripple by >10× versus charge pump mode |
| Robust protection suite | Includes short-circuit protection (400mA typ.), current-limit in sleep mode (60mA), thermal shutdown (150°C), and soft-start (200µs) |
| Compact WSON-10 packaging | 3mm × 3mm footprint with thermal DAP enables high-density portable designs while maintaining θJA = 55°C/W |
Applications
| Mobile Baseband Power | DSP Core Supply |
|---|---|
Use Scenario: Powering ARM-based baseband processors in GSM/UMTS handsets requiring adaptive voltage scaling between idle and burst transmission modes. IC Role / Device Role / Timing Role: Primary step-down regulator delivering dynamically switched 1.2V/1.5V to processor I/O and memory interfaces. Use Value: Reduces system power consumption by 12–18% during low-activity periods via VSEL-triggered voltage downshift and sleep-mode LDO engagement. |
Use Scenario: Supplying configurable voltage rails to programmable digital signal processors in portable audio recorders and voice assistants. IC Role / Device Role / Timing Role: Dual-rail charge pump regulator enabling real-time algorithm optimization through software-controlled VSEL transitions. Use Value: Eliminates need for discrete LDOs or external voltage translators, cutting BOM count by two components and saving 12mm² PCB area. |
| Pager & Wearable Standby | RF Front-End Bias |
Use Scenario: Maintaining ultra-low-power operation in medical pagers and fitness trackers during extended standby intervals (days to weeks). IC Role / Device Role / Timing Role: Sleep-mode LDO providing clean 1.2V bias to real-time clock, sensor interface, and wake-up controller. Use Value: Achieves 50–65µA quiescent current in sleep mode-3.2× lower than comparable buck converters-extending coin-cell battery life by >40%. |
Use Scenario: Generating stable, low-noise bias voltages for GaAs FETs and RF switches in Bluetooth/Wi-Fi modules. IC Role / Device Role / Timing Role: Low-ripple 1.5V supply source with fast transient response (<200µs) during RF transmit/receive state changes. Use Value: Delivers <15mVpp output ripple (with 10µF COUT) and 200µs turn-on time, preventing RF desense and ensuring consistent Tx power accuracy. |
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 or sleep-mode LDO; higher 300mA IOUT; 1.2MHz fixed-frequency operation | Targeted at noise-insensitive digital logic rails where dynamic voltage scaling is unnecessary | Select when fixed 1.8V output and higher current outweigh need for dual-voltage flexibility and ultra-low sleep current |
| TPS60403DBVR | Fixed 3.3V output; no VSEL/SLEEP pins; 60mA IOUT; 500kHz PFM; smaller SOT-23-5 package | Designed for low-current auxiliary rails (e.g., sensor bias, LED drivers) in space-constrained IoT nodes | Choose for cost-sensitive, low-power applications where 1.2V/1.5V dynamic selection and 250mA capability are not required |
Compared with LM2770SD-1215/NOPB, LM27762DSGT offers higher output current but lacks dynamic voltage selection and sleep-mode LDO functionality, while TPS60403DBVR provides minimal footprint and cost at the expense of output flexibility and load capacity-making LM2770SD-1215/NOPB uniquely suited for dual-voltage, battery-optimized portable baseband systems.
Availability
LM2770SD-1215/NOPB is available at Aetrix Electronics and suitable for mobile phone baseband power, DSP core supply, pager standby operation, and RF front-end bias applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2770SD-1215/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 solutions for industrial, automotive, and portable electronics markets.
The LM2770 product line delivers high-efficiency, capacitor-based DC/DC conversion for space- and battery-constrained portable devices-designed specifically to replace inefficient LDOs and inductor-based buck regulators in handheld and wearable applications.
FAQ
What is the exact output voltage pair supported by LM2770SD-1215/NOPB?
The LM2770SD-1215/NOPB is factory-configured for a 1.2V / 1.5V output voltage pair. When VSEL is logic-high, VOUT regulates to 1.5V (±3%); when VSEL is logic-low, VOUT regulates to 1.2V (±3%). This pairing is confirmed in the Electrical Characteristics table for LM2770-1215 on page 4 of SNVS318E, with specified min/typ/max values across temperature and load conditions.
How does sleep mode operate in LM2770SD-1215/NOPB, and what is its current consumption?
In LM2770SD-1215/NOPB, sleep mode is activated by driving the SLEEP pin high, which disables the charge pump and engages an integrated low-noise LDO. This LDO delivers up to 20mA with 50–65µA quiescent current (ISLEEP), as specified in the Electrical Characteristics table on page 5 of SNVS318E. Output voltage remains 1.2V or 1.5V depending on VSEL state.
What external capacitors are required for proper operation of LM2770SD-1215/NOPB?
LM2770SD-1215/NOPB requires four external MLCCs: CIN (10µF), COUT (10µF), C1 (1.0µF), and C2 (1.0µF), all rated X5R or X7R with low ESR (≤15mΩ). TDK C2012X5R0J106M (10µF) and C1005X5R0J105K (1µF) are explicitly recommended in the datasheet. Y5V/Z5U types are prohibited due to excessive DC bias drift.
Does LM2770SD-1215/NOPB support true shutdown, and what is its leakage current?
Yes, LM2770SD-1215/NOPB enters true shutdown when the EN pin is driven low, disconnecting VOUT from VIN and reducing supply current to 0.1–0.5µA (ISD), per the Electrical Characteristics table on page 5 of SNVS318E. During shutdown, internal feedback resistors pull VOUT toward GND unless externally driven.
What is the thermal performance of LM2770SD-1215/NOPB in its WSON-10 package?
LM2770SD-1215/NOPB in WSON-10 has a junction-to-ambient thermal resistance (θJA) of 55°C/W under standard JEDEC PCB conditions, as stated in the Thermal Properties table on page 3 of SNVS318E. Thermal shutdown activates at 150°C (typ.) and releases at 140°C (typ.), with the exposed DAP critical for heat dissipation in high-current layouts.
LM2770SD-1215/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:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V, 1.5V
- 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-1215/NOPB FAQ
1.How can I place an order for LM2770SD-1215/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2770SD-1215/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-1215/NOPB reliable?
The price and inventory of LM2770SD-1215/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-1215/NOPB is usually 5 days.
3.What payment methods are accepted for LM2770SD-1215/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2770SD-1215/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2770SD-1215/NOPB?
LM2770SD-1215/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2770SD-1215/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-1215/NOPB?
For technical support, including LM2770SD-1215/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2770SD-1215/NOPB requirements.
6.How does Aetrix verify that LM2770SD-1215/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2770SD-1215/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-1215/NOPB meets industry standards.
7.What is the process for return or replacement of LM2770SD-1215/NOPB?
All LM2770SD-1215/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2770SD-1215/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-1215/NOPB part is unused and in its original packaging.
Return procedure for LM2770SD-1215/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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