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LM25122-Q1
3-42-V wide VIN, synchronous boost controller with multiphase capability, AEC-Q100 qualified
Data sheet
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LM25122-Q1
- AEC-Q100 Qualified with the following results:
- Device Temperature Grade 1: -40°C to +125°C Ambient Operating Temperature Range
- Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C6
- Maximum Input Voltage : 42 V
- Min Input Voltage : 3 V (4.5 V for startup)
- Output Voltage up to 50 V
- Bypass (VOUT = VIN) Operation
- 1.2 V Reference with ±1.0% Accuracy
- Free-Run and Synchronizable Switching to 600 kHz
- 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
- Multiphase Capability
- Thermally Enhanced 20-Pin HTSSOP
The LM25122 is a multiphase 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 600 kHz. 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 180º 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 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM25122-Q1 Wide-Input Synchronous Boost Controller With Multiple Phase Capability datasheet (Rev. B) | PDF | HTML | 27 May 2016 |
| 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 | ||
| Technical article | Get loud with a 700W automotive audio amplifier for infotainment systems | PDF | HTML | 15 Jun 2017 | |
| More literature | TI Automotive External Amplifiers (Rev. A) | 03 Feb 2017 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Reference designs
PMP11769 — 700-W Automotive External Audio Amplifier Reference Design
This reference design contains a boost converter that provides 36.0-V @ 10.0-A continuous / 20.0-A peak from an input voltage of 9 to 16 V. It contains two premium Class-D audio amplifiers which provide 2x 175-W @ 4-Ω load (left and right channel) and 1x 350-W @ 2-Ω (subwoofer). (...)
Reference designs
PMP31114 — Synchronous SEPIC suited for 3-V cold cranking reference design
This reference design uses LM25122 with an output voltage of 5-V and 5-A max output current. The typical input voltage range is from 6 V to 18 V. The design withstands input voltages as low as cold crank 3 V and load dump up to 36 V. Switching frequency FSW has been measured for this individual (...)
Test report: PDF
Reference designs
TIDA-01610 — Automotive Tracking Power Supply Reference Design for Audio Amplifiers
This reference design implements a 10 amp, two-phase boost converter with an adjustable output voltage that can be dynamically set for voltages from 16V to 40V DC. The output voltage range allows tracking an audio signal when provided by either a PWM signal from a processor or a voltage.
Reference designs
TIDA-01534 — Automotive Off-battery Dual-phase Boost Converter Reference Design
This reference design is a high power, wide input voltage range circuit that uses synchronous boost controllers in a dual-phase configuration outputting four (4) switchable 12-V rails that each can supply up to 2.5 A with diagnostic features; plus a dual synchronous buck that generates two high (...)
Reference designs
TIDA-01553 — Automotive Off-battery VCM Supporting 2.5-V Cold Crank Profile Reference Design
This reference design is a high-current, wide input voltage range circuit that can handle engine cold crank profile down to 2.5V. The dual-output voltages are 5V and 3.3V that support up to 10A for each output. The design is suitable for an automotive off-battery infotainment application that (...)
Reference designs
PMP21112 — 98% Efficient 400W Adjustable Output Dual Phase Boost with Envelope Tracking Reference Design
PMP21112 is a dual-phase boost reference design utilizing the LM25112-Q1 controller for automotive applications. This design can operate from 9V to 16V. The design has an adjustable output of 16V to 40V and capable of sourcing 10A continuous current. LM25112-Q1 has a bypass function where Vin is (...)
Reference designs
TIDA-00699 — Front End Power Supply Reference Design with Cold Crank Operation, Transient Protection, EMI Filter
This solution was designed to be a broadly applicable automotive off-battery front end power supply for 10-15W systems. There is a focus on EMI/EMC testing and compliance as well to help designers satisfy the regulatory requirements associated with producing an automotive electronic subsystem.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
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