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LM51561 ACTIVE

2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum

LM5156x 2.2-MHz Wide VIN 65-V Non-synchronous Boost/SEPIC/Flyback Controller with Dual Random Spread Spectrum datasheet (pdf, 2.15 MB)

Parameters

Iq(Typ)(mA)	0.49
TI functional safety category	Functional Safety-Capable
Features	Adjustable Current Limit Enable Frequency Synchronization Hiccup mode protection Light Load Efficiency Power Good UVLO Adjustable
Vout(Min)(V)	1.5
Regulated outputs(#)	1
Switching frequency(Min)(kHz)	100
Switching frequency(Max)(kHz)	500
Package Group	WSON\|12
Vout(Max)(V)	300
Duty cycle(Max)(%)	93
Operating temperature range(C)	-40 to 125
Rating	Automotive
Vin(Max)(V)	60
Vin(Min)(V)	1.5

Features & description

Functional Safety-Capable
- Documentation available to aid functional safety system design
Suited for wide input operating range battery applications
- 3.5-V to 60-V operating range (65-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 65 V
- Minimized battery drain
  - Low shutdown current (I_Q ≤ 2.6 µA)
  - Low operating current (I_Q ≤ 490 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)
EMI mitigation
- Selectable dual random spread spectrum
- Lead-less package
Higher efficiency with low-power dissipation
- 100-mV ±7% accurate 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 overload protection (see the Device Comparison Table)
- Programmable line UVLO
- OVP protection
- Thermal shutdown
±1% accuracy feedback reference
Supports additional slope compensation
Programmable soft start
PGOOD indicator
Create a custom design using the LM5156x with the WEBENCH power designer

The LM5156x (LM5156 and LM51561) device 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 LM5156x 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.