500-kHz wide VIN nonsynchronous boost, flyback, & SEPIC controller
Product details
Parameters
Package | Pins | Size
Features
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C TA
- Maximum operating temperature 150°C TJ
- Functional Safety-Capable
- Suited for wide input operating range car battery applications
- 3.5-V to 40-V operating range (45-V abs max)
- 2.97-V to 16-V when BIAS = VCC
- Minimum boost supply voltage 1.5 V when BIAS ≥ 3.5 V
- Input transient protection up to 45 V
- Minimized battery drain
- Low shutdown current ( IQ ≤ 2.6 µA )
- Low operating current ( IQ ≤ 490 µA )
- Small solution size and low cost
- Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
- Minimized undershoot during cranking (start-stop application)
- Higher efficiency with low-power dissipation
- 100-mV ±7% accurate current limit threshold
- Strong 1.0-A peak standard MOSFET driver
- Supports external VCC supply
- Avoid AM band interference and crosstalk
- Optional clock synchronization
- Dynamically programmable switching frequency from 100 kHz to 500 kHz
- Integrated protection features
- Constant peak current limiting over input voltage
- Hiccup mode overload protection
- Programmable line UVLO
- OVP protection
- Thermal shutdown
- Accurate ±1% accuracy feedback reference
- Programmable extra slope compensation
- Adjustable soft start
- PGOOD indicator
- 14-Pin HTSSOP package (5.0 mm × 4.4 mm)
- Create a custom design using the LM34966-Q1 with the WEBENCH power designer
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Description
The LM34966-Q1 is a wide input range, non-synchronous boost controller that uses peak current mode control. The device can be used in boost, SEPIC, and flyback topologies. The device can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V. The internal VCC regulator also supports BIAS pin operation up to 40 V (45-V absolute maximum) for automotive load dump. The switching frequency is dynamically programmable with an external resistor from 100 kHz to 500 kHz.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM34966-Q1 500kHz Wide VIN Non-synchronous Boost/SEPIC/Flyback Controller datasheet | Sep. 23, 2020 |
Functional safety information | LM34966-Q1, LM5156x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution (Rev. B) | Jan. 12, 2021 | |
User guide | LM34966EVM-FLY Flyback Evaluation Module | Sep. 28, 2020 | |
More literature | LM34966EVM-FLY EU Declaration of Conformity (DoC) | Sep. 10, 2020 | |
Technical articles | How to add overvoltage protection to a synchronous boost controller | Sep. 17, 2018 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- Input voltage range: 18V to 36V
- Isolate output voltage 5V at 4A
- Switching frequency 250kHz
- Hiccup mode short circuit protection
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
HTSSOP (PWP) | 14 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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