Calculation tool
LM5122-BOOST-CALC — LM5122 quick start calculator
LM5122 quick start calculator for boost topology
LM5122ZA
3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase capability
Data sheet
LM5122ZA
- 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 24-Pin HTSSOP
The LM5122ZA 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 3 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5122ZA Wide-Input Synchronous Boost Controller With Multiple Phase Capability datasheet (Rev. A) | PDF | HTML | 07 Nov 2018 |
| 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 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
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
Simulation model
LM5122 Unencrypted PSpice Average Model Package (Rev. A)
SNVMBC0A.ZIP (78 KB) - PSpice Model
Calculation tool
SNVC196 — LM25122-Q1 Design Calculator
Supported products & hardware
Products
AC/DC & DC/DC controllers (external FET)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 24 | Ultra Librarian |
Ordering & quality
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Support & training
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