Calculation tool
LM5122-BOOST-CALC — LM5122 quick start calculator
LM5122 quick start calculator for boost topology
LM5122-Q1
Automotive, 3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase
Data sheet
A newer version of this product is available
Same functionality with different pin-out to the compared device
LM5122-Q1
- AEC-Q100 Qualified with the following results:
- Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
- Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C6
- Maximum Input Voltage: 65 V
- Minimum Input Voltage: 3 V (4.5 V for Start-Up)
- Output Voltage up to 100 V
- Bypass (VOUT = VIN) Operation
- 1.2-V Reference with ±1% Accuracy
- Free-Run and Synchronizable Switching to 1 MHz
- Peak-Current-Mode Control
- Robust 3-A Integrated Gate Drivers
- Adaptive Dead-Time Control
- Optional Diode-Emulation Mode
- Programmable Cycle-by-Cycle Current Limit
- Hiccup-Mode Overload Protection
- Programmable Line UVLO
- Programmable Soft Start
- Thermal Shutdown Protection
- Low Shutdown Quiescent Current: 9 µA
- Programmable Slope Compensation
- Programmable Skip-Cycle Mode Reduces Standby Power
- Allows External VCC Supply
- Inductor DCR Current Sensing Capability
- Multi-phase Capability
- Thermally Enhanced 20-Pin HTSSOP
- Create a Custom Design Using the LM5122 With the WEBENCH® Power Designer
The LM5122 is a multi-phase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The control method is based upon peak-current-mode control. Current-mode control provides inherent line feed forward, cycle-by-cycle current limiting, and ease of loop compensation.
The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode-emulation mode also enables discontinuous-mode operation for improved efficiency at light load conditions.
An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass operation). A 180° phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup-mode current limit, and adjustable line undervoltage lockout.
Technical documentation
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View all 7 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5122-Q1 Wide-Input Synchronous Boost Controller With Multiple Phase Capability datasheet | PDF | HTML | 09 Jun 2017 |
| White paper | An overview of radiated EMI specifications for power supplies | 05 Jun 2018 | ||
| White paper | An overview of conducted EMI specifications for power supplies | 01 Feb 2018 | ||
| Application brief | Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout | 13 Nov 2017 | ||
| Analog Design Journal | Designing the front-end DC/DC conversion stage to withstand automotive transient | 18 Jan 2017 | ||
| EVM User's guide | LM5122EVM-1PH User's Guide | 22 Apr 2013 | ||
| EVM User's guide | LM5122EVM-2PH User's Guide | 22 Apr 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM5122EVM-1PH — LM5122EVM-1PH Wide Vin Synchronous Boost Controller Evaluation Module
The LM5122EVM-1PH evaluation module (EVM) provides the design engineer with a fully functional synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost controller IC. The EVM provides 24V output at up to 4.5A current from a 9V to 20V input. The EVM is designed to (...)
User guide: PDF
Evaluation board
LM5122EVM-2PH — LM5122EVM-2PH Wide Vin Synchronous Boost Controller Evaluation Module
The LM5122EVM-2PH evaluation module (EVM) provides the design engineer with a fully functional dual phase synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost controller IC. The EVM provides 28V output at up to 7A current from a 9V to 20V input. The EVM is (...)
User guide: PDF
Evaluation board
TPS92662AEVM6-104 — TPS92662A-Q1 six channel matrix evaluation module
The TPS92662AEVM6-104 consists of 66 invidividually controllable LEDs configured into a six channel application. This evaluation module shows the versatility and configurability of the TPS92662A-Q1 LED Matrix Manager Device. Using the companion control PCB, 6CHAUTOECU-899, and the TPS92662AEVM (...)
Evaluation board
TPS92662EVM6-900 — TPS92662-Q1 six channel matrix evaluation module
The TPS92662EVM6-900 consists of 66 invidividually controllable LEDs configured into a six channel application. This evaluation module shows the versatility and configurability of the TPS92662-Q1 LED Matrix Manager Device. Using the companion control PCB, 6CHAUTOECU-899, and the TPS92662EVM (...)
Simulation model
LM5122 Dual-Phase TINA-TI Transient Reference Design
SNVMAV2.TSC (729 KB) - TINA-TI Reference Design
Simulation model
LM5122 TINA-TI Transient Reference Design (Rev. B)
SNVM495B.TSC (188 KB) - TINA-TI Reference Design
Simulation model
LM5122 TINA-TI Transient Spice Model (Rev. B)
SNVM494B.ZIP (52 KB) - TINA-TI Spice Model
Reference designs
TIDA-01520 — 50W Dual-stage LED Driver Reference Design with Adaptive Pre-boost Control for Automotive Headlights
The TIDA-01520 dual-stage reference design drives two strings of LEDs for automotive headlight applications while automatically adapting the pre-boost voltage without the need of a microcontroller (MCU) which saves space and cost. Additionally, the design’s adaptive, pre-boost control (...)
Reference designs
PMP7837 — Power Reference Design for 450W Automotive Audio Amplifier
The PMP7837 is a 4-phase synchronous boost converter that can take a 6-17V input and put out 24V at 450W. It is used for powering up to eight 50W automotive trunk amplifiers. The 4-phase synchronous design with 450kHz switching frequency per phase results in a compact and efficient circuit well (...)
Reference designs
PMP10749 — 100W System-Level Power Reference Design for Automotive Infotainment System
PMP10749 is a 100-W system-level SMPS design for a higher-power automotive infotainment system. The design has protections, such as load dump through TVS (ISO pulse testing), as well as reverse voltage (innovative smart diode with very low Iq) protection. Furthermore, all the controllers (boost and (...)
Reference designs
TIDA-00748 — 60W Synchronous Boost LED Driver Reference Design for Automotive Application
TIDA-00748 is a 60W Synchronous Boost Design for automotive LED application utilizing the Synchronous Boost Converter LM5122-Q1. This design applies to automotive lighting for exterior lighting such as headlights and taillights and also interior LED lighting systems. The design accepts an (...)
Reference designs
PMP9403 — 192W Dual-Phase Synchronous Boost Converter Reference Design
PMP9403 is a high-efficiency dual-phase synchronous boost converter using the LM5122 controller ICs. The design accepts an input voltage of 9Vin to 15Vin (12Vin Nominal) and provides an output of 48Vout capable of supplying 4A of continuous current to the load.
Reference designs
TIDA-00223 — Automotive Audio I2S over Coax Class D Amplifier Reference Design
This reference design is an I²S/TDM-based, low-cost, easy-to-use alternative to fiber optics/analog copper wire for connecting an automotive (sound) control panel to an output stage/power amplifier. Supporting I²S as well as TDM, it is capable of transmitting digital audio signal to 16 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
Ordering & quality
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