Overview
The LM5155QDSSRQ1, produced by Texas Instruments, is a wide input range, non-synchronous boost controller that utilizes peak current mode control. This device is part of the LM5155x-Q1 family, which includes the LM5155-Q1 and LM51551-Q1. It is designed to operate in boost, SEPIC, and flyback topologies, making it versatile for various power supply applications. The LM5155QDSSRQ1 is AEC-Q100 qualified for automotive applications and is functional safety-capable, with a temperature grade 1 rating of –40°C to +125°C. It features a wide input operating range, supporting voltages from 3.5 V to 45 V, and 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.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage Range (BIAS to AGND) | -0.3 | 50 | V | |
| Operating Temperature Range | -40 | 150 | °C | |
| Switching Frequency Range | 100 kHz | 2.2 MHz | ||
| Maximum Duty Cycle Limit | 80% | 85% | 90% | |
| Current Limit Threshold (CS-PGND) | 93 mV | 100 mV | 107 mV | |
| Peak Driver Current | 1.5 A | |||
| Package Type | 12-Pin WSON | |||
| Package Size | 3 mm × 2 mm |
Key Features
- Strong 1.5-A peak standard MOSFET driver
- Supports external VCC supply to improve efficiency
- Avoid AM band interference and crosstalk with optional clock synchronization
- Dynamically programmable switching frequency from 100 kHz to 2.2 MHz
- Integrated protection features: constant peak current limiting, overvoltage protection, line UVLO, thermal shutdown, and optional hiccup mode short-circuit protection
- Accurate ±1% accuracy feedback reference
- Programmable extra slope compensation and adjustable soft start
- PGOOD indicator for power-good status
- Low shutdown current (IQ ≤ 2.6 µA) and low operating current (IQ ≤ 480 µA)
- Small solution size and low cost
Applications
- Automotive start-stop applications
- High voltage LiDAR power supply
- Multiple-output flyback without optocoupler
- Automotive rear-lights LED bias supply
- Wide input boost, SEPIC, flyback power modules
- Portable speaker applications
- Battery-powered boost, SEPIC, flyback applications
Q & A
- What is the operating temperature range of the LM5155QDSSRQ1?
The operating temperature range is –40°C to +150°C. - What are the supported topologies for the LM5155QDSSRQ1?
The device supports boost, SEPIC, and flyback topologies. - What is the minimum input voltage for startup if the BIAS pin is connected to the VCC pin?
The minimum input voltage for startup is 2.97 V. - Can the LM5155QDSSRQ1 operate with an input supply voltage as low as 1.5 V?
Yes, it can operate with an input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V. - What is the maximum switching frequency of the LM5155QDSSRQ1?
The maximum switching frequency is 2.2 MHz. - Does the LM5155QDSSRQ1 have built-in protection features?
Yes, it includes features such as cycle-by-cycle current limit, overvoltage protection, line UVLO, thermal shutdown, and optional hiccup mode short-circuit protection. - How accurate is the feedback reference of the LM5155QDSSRQ1?
The feedback reference has an accuracy of ±1%. - Can the LM5155QDSSRQ1 be used in automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications and is functional safety-capable. - What is the package type and size of the LM5155QDSSRQ1?
The package type is a 12-Pin WSON, and the size is 3 mm × 2 mm. - Does the LM5155QDSSRQ1 support external clock synchronization?
Yes, it supports optional clock synchronization.
