Calculation tool
LM51551
2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with hiccup
Data sheet
LM51551
- 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
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.
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Technical documentation
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View all 16 Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM5155EVM-BST — LM5155 Boost Controller Evaluation Module
The LM5155EVM-BST evaluation module showcases the features and performance of the LM5155, wide input non-synchronous boost controller. The standard configuration is designed to provide a regulate output of 24V at 2A from an input of 6V to 18V, switching at 440 kHz.
This EVM is designed for ease of (...)
User guide: PDF
Evaluation board
LM5155EVM-FLY — LM5155 Flyback Controller Evaluation Module
The LM5155EVM-FLY evaluation module showcases the features and performance of the LM5155 as a wide input non-synchronous flyback controller. The standard configuration is designed to provide a regulated output of 5V at 4A from an input of 18V to 36V, switching at 250 kHz. This evaluation module is (...)
User guide: PDF
Evaluation board
LM5155EVM-SEPIC — LM5155 SEPIC evaluation module
The LM5155EVM-SEPIC evaluation module showcases the features and performance of the LM5155 as wide input non-synchronous SEPIC controller. The standard configuration is designed to provide a regulated output of 12V at up to 2A from an input of 3V to 42V, switching at 2.2 MHz.
Simulation model
LM5155-Q1 PSpice Transient Model (unencrypted) (Rev. F)
SNVMBL2F.ZIP (204 KB) - PSpice Model
Simulation model
LM5155-Q1 PSpice Transient Model (unencrypted) (Rev. H)
SNVMBL2H.ZIP (206 KB) - PSpice Model
Simulation model
LM5155-Q1 TINA-TI STARTUP REFERENCE DESIGN
SNVMBV8.TSC (1162 KB) - TINA-TI Reference Design
Simulation model
Unencrypted LM5155-Q1 PSpice Average Model (Rev. B)
SNVMBY3B.ZIP (81 KB) - PSpice Model
Calculation tool
SNVC240 — LM5155/56 Flyback Controller Quick Start Calculator
LM5155/56 Flyback Controller Quick Start Calculator
Supported products & hardware
Products
AC/DC & DC/DC controllers (external FET)
Hardware development
Evaluation board
Calculation tool
SNVR481 — LM5155/56 SEPIC Controller Quick Start Calculator
Supported products & hardware
Products
AC/DC & DC/DC controllers (external FET)
Hardware development
Evaluation board
Reference designs
PMP22800 — 24V, 1.2A DC/DC flyback reference design
This reference design uses the LM51551 as a secondary side regulated (SSR) flyback controller. It converts an input of 8 to 28.8 V and 24 V at a maximum power of 28.8 W. The supply starts up at a minimum input of 15.5 V and can operate to 8-V input. The design also includes the synchronous buck (...)
Test report: PDF
Reference designs
PMP22764 — Isolated flyback converter (24-V to 56-V/1.25-A) reference design
This reference design utilizes a diode rectified flyback converter for a 24-V input to isolated 56-V/1.25-A output. The LM51551 PWM controller provides the control for the flyback converter, including hiccup mode short circuit protection. This reference design is ideal for when any well-regulated (...)
Reference designs
PMP30805 — Tiny automotive SEPIC reference design
This tiny automotive SEPIC reference design contains a 6-W auxiliary power supply and is designed for a 12-V bias rail. The wide input accepts cranking down to 4.5 Vmin and surge up to 40 Vmax. Due to switching frequency of 2 MHz, the dual inductor is fairly small, resulting in excellent dynamic (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WSON (DSS) | 12 | Ultra Librarian |
Ordering & quality
Information included:
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- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Support & training
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