LTC3531EDD#TRPBF Analog Devices Integrated Circuit (Small Outline No-lead) In Stock
Analog Devices LTC3531EDD#TRPBF is a 200mA synchronous buck-boost DC-DC converter operating from 1.8V to 5.5V input, maintaining a regulated output even when input crosses output voltage. Delivers up to 200mA load current with high efficiency in a compact 3x3mm 8-pin DFN package. Ideal for single-cell Li-ion and alkaline battery-powered applications requiring stable output across the full discharge curve.
- Manufacturer
- Analog Devices
- Package
- Small Outline No-lead
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LTC3531EDD#TRPBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.7100(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LTC3531EDD#TRPBF?
- True buck-boost topology maintaining regulated output across a 1.8V to 5.5V input range without dropout
- 200mA output current capability sustaining loads through the full Li-ion discharge from 4.2V to 2.7V
- High-efficiency synchronous switching minimizing quiescent current for extended battery life
- Compact 3x3mm 8-pin DFN package with exposed pad for low-profile, space-constrained designs
- Fixed output voltage options covering 1.8V, 2.5V, 3V, and 3.3V rails common in portable electronics
What is LTC3531EDD#TRPBF used for?
The LTC3531EDD#TRPBF is designed for single-cell lithium-ion and alkaline battery applications where the input voltage rises above, falls below, and equals the regulated output as the battery discharges. Typical uses include portable medical instruments, Bluetooth and Zigbee modules, and handheld test equipment requiring a stable 3.3V or 3V rail throughout the battery discharge cycle from 4.2V down to 1.8V. Its high-efficiency synchronous buck-boost topology and low quiescent current extend battery life in IoT sensor nodes and wearable devices where standby current directly determines months of operation.
What are the specifications of LTC3531EDD#TRPBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1698 |
| YTEOL | 10 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 1.8V |
| Input Voltage-Nom | 3.6V |
| JESD-30 Code | S-PDSO-N8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 0.46A |
| Package Body Material | PLASTIC/EPOXY |
| 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 |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| 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 | 8542.39.00.01 |
| Country of Origin | Malaysia |
Where can I find the LTC3531EDD#TRPBF datasheet?
LTC3531EDD#TRPBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LTC3531EDD#TRPBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the LTC3531EDD#TRPBF maintain regulation when the input voltage crosses the output voltage during battery discharge?
The LTC3531 uses a 4-switch synchronous buck-boost topology that seamlessly transitions between buck mode (VIN > VOUT), pass-through mode (VIN ≈ VOUT), and boost mode (VIN < VOUT) without output glitches. For a 3.3V output from a single Li-ion cell discharging from 4.2V to 2.7V, the converter handles the crossover near 3.3V with less than 1% output voltage deviation, which is critical for microcontrollers and radios that malfunction if supply dips below their minimum operating voltage.
What is the quiescent current of the LTC3531EDD#TRPBF, and how does that affect battery run time in a low-power IoT node?
The LTC3531 draws a typical quiescent current of approximately 25 µA in Burst Mode operation when lightly loaded. For an IoT sensor node sleeping most of the time with an average load of 100 µA, this translates to the regulator consuming roughly 25% of total system quiescent power. Using a 1000 mAh AA alkaline cell pair, the system can sustain standby operation for over 5,000 hours, compared to about 1,000 hours with a less efficient regulator drawing 100 µA quiescent current.
For a Bluetooth Low Energy module requiring 3V at 150mA peak, does the LTC3531EDD#TRPBF provide adequate headroom from a depleted Li-ion cell at 2.8V?
Yes, the LTC3531 is rated at 200mA output current and can boost a 2.8V input to 3V output while delivering 150mA to the BLE radio during a transmit burst. Efficiency in boost mode at this operating point is typically 85% to 90%, so input current from the cell will be approximately 160mA to 170mA—within the discharge capability of most 500mAh to 1000mAh Li-ion cells. This makes the LTC3531 a viable single-regulator solution without needing an additional boost converter for BLE radio power.
How does the 3x3mm DFN package of the LTC3531EDD#TRPBF affect PCB layout, and what external components are required?
The 8-pin DFN package occupies just 9 mm² of PCB area. The complete power supply circuit requires only two inductors and a handful of capacitors, with a typical total footprint under 50 mm² including external passives. The exposed pad on the DFN underside must be soldered to a copper pour connected to GND to ensure proper thermal dissipation at full 200mA load, preventing junction temperature rise above the 125°C maximum rating in a 3x3mm package with limited exposed copper.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $7.1100 | $7.11 |
| 5+ | $5.2140 | $26.07 |
| 15+ | $4.7400 | $71.10 |
| 19+ | $3.5900 | $68.21 |
| 500+ | $2.9500 | $1475.00 |
| 1000+ | $2.7100 | $2710.00 |
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