LT3959EUHE#PBF Analog Devices Integrated Circuit (Other) In Stock
Analog Devices LT3959EUHE#PBF is a wide-input current-mode PWM boost/SEPIC/inverting converter with a 5 A, 40 V internal switch, operating from 1.6 V to 40 V input in a 28-pin QFN package. Available from stock with worldwide shipping.
- Manufacturer
- Analog Devices
- Package
- Other
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- LT3959EUHE#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $4.2100(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LT3959EUHE#PBF?
- Wide 1.6 V to 40 V input range with 5 A, 40 V internal switch supports boost, SEPIC, and inverting topologies from a single IC
- Current-mode PWM control with adjustable frequency from 100 kHz to 1 MHz minimizes external inductor size
- Burst mode operation reduces quiescent current to under 40 µA at light loads for battery-powered applications
- Integrated soft-start and slope compensation prevent inductor current runaway during startup across the full 40 V input range
What is LT3959EUHE#PBF used for?
The LT3959EUHE#PBF is used in automotive, industrial, and telecom power supply designs that must generate a regulated output from a wide-ranging or unregulated input bus between 1.6 V and 40 V. In SEPIC configuration it can hold a 12 V output stable whether the input is above or below 12 V, making it ideal for start-stop automotive battery rails and hold-up capacitor systems. The inverting topology mode allows single-supply systems to generate a negative rail for op-amp or ADC reference circuits without a second power converter.
What are the specifications of LT3959EUHE#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1836 |
| YTEOL | 10 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 40V |
| Input Voltage-Min | 1.6V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | R-PQCC-N28 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 8A |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 1000kHz |
| Technology | BIPOLAR |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Other |
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 | Thailand |
Where can I find the LT3959EUHE#PBF datasheet?
LT3959EUHE#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LT3959EUHE#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What topologies can the LT3959EUHE#PBF implement with a single IC?
The LT3959EUHE#PBF supports boost, SEPIC, and inverting (flyback) converter topologies using the same 28-pin QFN IC. The boost topology steps voltage up from 1.6 V to outputs up to 40 V, the SEPIC topology provides a regulated output either above or below the input, and the inverting topology generates a negative output rail. Switching between topologies requires only inductor and capacitor rearrangement, not a different IC.
How does the LT3959EUHE#PBF perform in an automotive start-stop system where the battery voltage collapses to 3 V during cranking?
The LT3959EUHE#PBF continues regulating from input voltages as low as 1.6 V, so it can maintain a stable 12 V output in SEPIC mode even when the battery collapses to 3 V during engine cranking. The 5 A internal switch and current-mode control prevent inductor saturation during the high step-up ratio required at low input, and soft-start limits inrush current to protect the battery connection.
What switching frequency range does the LT3959EUHE#PBF support, and how does frequency choice affect inductor size?
The LT3959EUHE#PBF's switching frequency is adjustable from 100 kHz to 1 MHz via a single external resistor. Operating at 1 MHz reduces the required inductor value by roughly 10× compared to 100 kHz, allowing the use of inductors as small as 4.7 µH for compact designs, though switching losses increase. Operating at 200–300 kHz balances inductor size and efficiency for most industrial and automotive applications.
How does the LT3959EUHE#PBF's burst mode help extend battery run time in a portable instrument?
In burst mode, the LT3959EUHE#PBF reduces quiescent supply current to under 40 µA at light loads by skipping switching pulses when the output voltage is in regulation. For a design drawing 10 mA average from a 3.7 V lithium cell, reducing quiescent current from 1 mA to 40 µA saves approximately 960 µA, extending battery life by up to 10% in standby-dominated duty cycles.
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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+ | $9.9900 | $9.99 |
| 10+ | $6.7830 | $67.83 |
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