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Data sheet
LM5155
- 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 21 Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
DRV5825PEVM-AMPS097 — 4.5-V to 26.4-V, 7.5-A stereo, 15-A mono, Piezo driver with smart I/V protection evaluation module
The DRV5825PEVM evaluation module (EVM) showcases the latest TI digital input Class-D closed-loop amplifier for Piezo application. The DRV5825P is a digital input Class-D audio amplifier with Smart Piezo Driver Algorithm. The EVM can be used as stand-alone platform with default I2C register (...)
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
PMP40679 — 9.8~13.5-V input, 46-V 300-W output interleave boost reference design
This reference design is a 300-W power output interleaving combination of two boost converters using LM5155 controller. Each converter outputs continuous 150-W and 200-W peak. A LMC555 circuit generates 150k-Hz square wave signal and its anti-phase signal for synchronous clock for the two LM5155, (...)
Reference designs
PMP40488 — 6-W dual-output SEPIC converter reference design
This reference design employs LM5155 Boost/Flyback/SEPIC controller to provide 6-W outputs with dual-output SEPIC topology. The input is 12-VDC, and outputs are ±60 V/50 mA. The switching frequency is set at 500k Hz. This design achieves 88.2% peak efficiency. The cross regulation of -60-V (...)
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 (...)
Reference designs
PMP22151 — 70-W flyback and 37-W boost power reference design
This reference design uses two LM5155 devices to make a flyback and boost power stage. The flyback creates an isolated 28 Vdc bus from a 24 +/-10% Vdc bus and the boost creates a 37 Vdc bus from the output of the flyback. The flyback can be loaded up to 70 W and the boost can be loaded up to 37-W. (...)
Reference designs
PMP40555 — 9- to 60-VDC input, 12-V and 2-A output flyback reference design
This reference design is a wide input, 12-V and 2-A output isolated flyback converter using LM5155. The switching frequency is 250 kHz and the peak efficiency of the system is 89.19% at 24-V input. The load regulation in the input range is within ±0.5%. Peak-to-peak ripple of the output is (...)
Reference designs
PMP40569 — 36~57-Vdc input, 5-V/4-A output isolated flyback with synchronous rectification reference design
This reference design is a 36~57-Vdc input, 5-V/4-A output isolated flyback converter using LM5155 and UCC24612. The switching frequency is 250 kHz. With the synchronous rectification controller UCC24612 and a MOSFET at the secondary side, the system achieves 89.29% peak efficiency at 36-V input, (...)
Reference designs
TIDA-050023 — Type-3 IEEE802.3bt-ready flyback converter PoE powered device reference design
This design showcases a low cost, Type-3, Class 6, 51W flyback converter for powered devices through Power over Ethernet. The TPS2373-3 PD controller provides detection and classification while also powering up the LM51551-Q1 PWM controller through its advanced startup feature. This design takes in (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WSON (DSS) | 12 | Ultra Librarian |
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