LM51551-Q1 Texas instruments

LM51551-Q1

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LM51551-Q1

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Описание

The LM5155x-Q1 (LM5155-Q1 and LM51551-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 LM5155x-Q1 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.

AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C T_A
Functional Safety-Capable
- Documentation available to aid functional safety system design
Wide input operating range for car and portable battery applications
- 3.5-V to 45-V Operating range
- 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 50 V
Minimized battery drain
- Low shutdown current (I_Q ≤ 2.6 µA)
- Low operating current (I_Q ≤ 480 µA)
Small solution size and low cost
- Maximum switching frequency of 2.2 MHz
- 12-Pin WSON package (3 mm × 2 mm) with wettable flanks
- 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% Low current limit threshold
- Strong 1.5-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 2.2 MHz
Integrated protection features
- Constant peak current limiting over input voltage
- Optional hiccup mode short-circuit protection (see the Device Comparison Table)
- Programmable line UVLO
- OVP protection
- Thermal shutdown
Accurate ±1% accuracy feedback reference
Programmable extra slope compensation
Adjustable soft start
PGOOD indicator
Create a custom design using the LM5155x with the WEBENCH power designer

Control mode	current mode
UVLO thresholds on/off (V)	Programmable
Duty cycle (max) (%)	93
Switching frequency (max) (kHz)	2200
Features	Adjustable current limit, Frequency synchronization, Hiccup mode protection, Nonsynchronous rectification, Power good, Synchronization, UVLO adjustable
Operating temperature range (°C)	-40 to 150
Rating	Automotive
TI functional safety category	Functional Safety-Capable
Topology	Boost, Flyback, SEPIC