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Texas Instruments LM34966-Q1 Boost/SEPIC/Flyback Controller

Texas Instruments LM34966-Q1 Boost/SEPIC/Flyback Controller is a wide input range, non-synchronous boost controller that uses peak current mode control. The device can be used in either boost, SEPIC, or flyback topologies. The Texas Instruments LM34966-Q1 can start up from a 1-cell battery, with a minimum of 2.97V if the BIAS pin is connected to the V_CC pin. It can operate with the input supply voltage as low as 1.5V if the BIAS pin is greater than 3.5V. The internal V_CC regulator also supports BIAS pin operation up to 40V (45V absolute maximum) for automotive load dump. The switching frequency is dynamically programmable with an external resistor from 100kHz to 500kHz.

Features

AEC-Q100 qualified for automotive applications
- –40°C to +125°C T_A temperature grade 1
- Maximum operating temperature of 150°C T_J
Functional Safety-Capable
- Documentation available to aid functional safety system design
Suited for wide-input operating range car battery applications
- 3.5V to 40V operating range (45V abs max)
- 2.97V to 16V when BIAS = V_CC
- Minimum boost supply voltage 1.5V when BIAS ≥ 3.5V
- Input transient protection up to 45V
- Minimized battery drain
  - Low shutdown current (I_Q ≤ 2.6µA)
  - Low operating current (I_Q ≤ 490µA)
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
- 100mV ±7% accurate current limit threshold
- Strong 1.0A peak standard MOSFET driver
- Supports external V_CC supply
Avoid AM band interference and crosstalk
- Optional clock synchronization
- Dynamically programmable switching frequency from 100kHz to 500kHz
Integrated protection features
- Constant peak current limiting over the 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 (5.0mm × 4.4mm)

Applications

Automotive 12V battery application
Automotive start-stop application
High voltage LiDAR power supply
Multiple-output flyback without an optocoupler

Automotive rear-lights LED bias supply
Wide input boost, SEPIC, flyback power module
Audio amplifier application
Battery-powered boost, SEPIC, flyback

Texas Instruments LM34966-Q1 Boost/SEPIC/Flyback Controller

Features

Applications

Functional Block Diagram

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