LM5155 Texas instruments

LM5155

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LM5155

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Описание

The LM5155x (LM5155 and LM51551) 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 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.

Functional Safety-Capable
- Documentation available to aid functional safety system design
Wide input operating range for 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)
- 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

Topology	Boost, Flyback, SEPIC
Vin (min) (V)	1.5
Vin (max) (V)	45
Vout (min) (V)	1.5
Vout (max) (V)	300
Regulated outputs (#)	1
Switching frequency (min) (kHz)	100
Switching frequency (max) (kHz)	2200
Iq (typ) (mA)	0.45
Features	Adjustable current limit, Frequency synchronization, Nonsynchronous rectification, Power good, UVLO adjustable
Duty cycle (max) (%)	93
TI functional safety category	Functional Safety-Capable
Rating	Catalog
Operating temperature range (°C)	-40 to 125
Type	Controller