LM3668SD-4550/NOPB Texas Instruments Integrated Circuit (Small Outline No-lead) In Stock
LM3668SD-4550/NOPB is a high-efficiency dual-mode single-inductor buck-boost DC/DC converter delivering up to 1 A output with an input range of 2.5 V to 5.5 V. Using PWM voltage-mode control in a 12-pin SON package, it maintains regulation across input voltages above and below the output. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline No-lead
- Pin Count
- 13
- Lifecycle
- NOT RECOMMENDED
- Datasheet
- LM3668SD-4550/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.1250(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM3668SD-4550/NOPB?
- Single-inductor buck-boost topology delivers up to 1 A output current with input range 2.5 V to 5.5 V, maintaining regulation when Vin crosses Vout
- Dual-mode PWM voltage-mode control maximizes efficiency across light and heavy load conditions in battery-powered portable devices
- Compact 12-pin SON package minimizes board area for space-constrained wearable and IoT designs requiring stable power from Li-Ion cells
What is LM3668SD-4550/NOPB used for?
The LM3668SD-4550/NOPB is ideal for battery-powered portable electronics such as smartphones, tablets, and wearables where the supply voltage from a single Li-Ion cell (2.7 V to 4.2 V) must be regulated to a fixed output voltage of 4.55 V across the full discharge cycle. Its single-inductor buck-boost architecture reduces BOM cost and PCB area compared to separate buck and boost converter solutions. The device is also well-suited for USB-powered applications and portable medical devices requiring stable output voltage despite wide input voltage variation.
What are the specifications of LM3668SD-4550/NOPB?
| Pbfree Code | Yes |
| YTEOL | 3.9 |
| Analog IC - Other Type | DUAL SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 2.5V |
| Input Voltage-Nom | 3.6V |
| JESD-30 Code | S-PDSO-N12 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 2.05A |
| Output Voltage-Max | 5V |
| Output Voltage-Min | 2.8V |
| Output Voltage-Nom | 4.5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOLCC12,.12,16 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 2500kHz |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.4mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline No-lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the LM3668SD-4550/NOPB datasheet?
LM3668SD-4550/NOPB Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM3668SD-4550/NOPB?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the input voltage range of the LM3668SD-4550/NOPB and which battery chemistries does it support?
The LM3668SD-4550/NOPB accepts input voltages from 2.5 V to 5.5 V, covering the full discharge range of single-cell Li-Ion batteries (2.7 V to 4.2 V) and single-cell LiFePO4 batteries (2.5 V to 3.6 V). This makes it suitable for portable devices that must maintain a regulated 4.55 V output from a battery whose voltage crosses above and below the target output during normal use.
Why use a single-inductor buck-boost topology instead of separate buck and boost converters?
The LM3668SD-4550/NOPB uses a single inductor shared between buck and boost modes, reducing total component count by eliminating a second inductor, saving approximately 30% board area compared to a two-stage approach. This simplification also reduces power losses at mode transitions and lowers BOM cost in high-volume portable device production.
What output current can the LM3668SD-4550/NOPB deliver, and at what efficiency?
The LM3668SD-4550/NOPB delivers up to 1 A continuous output current with peak efficiency exceeding 90% under typical load conditions from a 3.6 V nominal input to the 4.55 V output. Its dual-mode PWM voltage-mode control transitions seamlessly between buck and boost modes, maintaining high efficiency across the load range from 10 mA to 1000 mA.
What package does the LM3668SD-4550/NOPB use and what does this mean for PCB layout requirements?
The LM3668SD-4550/NOPB is housed in a 12-pin SON (small outline no-lead) package measuring approximately 3 mm × 3 mm with an exposed thermal pad. The exposed pad must be soldered to a ground plane with at least 4 thermal vias to minimize junction-to-board thermal resistance, enabling sustained 1 A operation within a PCB footprint smaller than 25 mm².
Related Guides
STM32H725IGT3 Selection Guide: Memory, Package, Temperature, and Supply
Choose the right STM32H725 variant by comparing Flash, package, pin count, temperature grade, connectivity, and production requirements.
Aug 1, 2026
STM32H725IGT3 High-Performance MCU Design Guide
Design STM32H725IGT3 systems for reliable 550 MHz operation with practical power, clock, cache, DMA, PCB, ADC, and recovery guidance.
Jul 31, 2026
150141VS73100 Violet SMD LED Selection Guide: Color, Drive, and Sourcing
Select the 150141VS73100 by wavelength, brightness, drive current, 3528 fit, reliability, and traceable sourcing requirements.
Jul 31, 2026
STEF05SGR 5 V eFuse Protection Design Guide
Design a reliable 5 V STEF05SGR eFuse stage with current-limit math, capacitor sizing, thermal analysis, fault recovery, and PCB layout guidance.
Jul 30, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $2.2500 | $2.25 |
| 10+ | $1.6875 | $16.88 |
| 35+ | $1.3950 | $48.83 |
| 41+ | $1.1250 | $46.13 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit