Overview
The LM5088QMHX-1/NOPB, produced by Texas Instruments, is a wide input range non-synchronous buck controller designed for high-voltage step-down conversion. This controller features all the necessary functions to implement an efficient buck converter using a minimum number of external components. It operates over an ultra-wide input voltage range of 4.5 V to 75 V and is based on peak current mode control utilizing an emulated current ramp. This approach provides inherent line voltage feedforward, cycle-by-cycle current limiting, and ease of loop compensation. The LM5088 is available in two versions: LM5088-1 with a ±5% frequency dithering function for EMI reduction, and LM5088-2 with a versatile restart timer for overload protection.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | - | 75 | V |
| Output Voltage Range | 1.205 | - | - | V |
| Operating Temperature Range | -40 | - | 125 | °C |
| Switching Frequency Range | 50 kHz | - | 1 MHz | - |
| Feedback Reference Accuracy | - | 1.5% | - | % |
| Package Type | - | - | - | 16-pin HTSSOP |
| VCC Regulator Output Voltage | - | 7.8 | - | V |
| VCC Regulator Current Limit | - | 30 | - | mA |
Key Features
- Ultra-wide input voltage range from 4.5 V to 75 V.
- Peak current mode control with emulated current ramp for reduced noise sensitivity and reliable operation at high input voltages.
- Programmable switching frequency from 50 kHz to 1 MHz.
- ±5% frequency dithering function (LM5088-1) for EMI reduction.
- Versatile restart timer for overload protection (LM5088-2).
- Low dropout bias regulator and high voltage, low dropout bias supply.
- Tri-level enable input for shutdown and standby modes.
- Soft start and oscillator synchronization capability.
- Thermal shutdown protection).
- AEC-Q100 qualified with device temperature grade 1: –40°C to +125°C ambient operating temperature range).
Applications
- Automotive infotainment and USB accessory adapters).
- Industrial DC-DC bias and motor drivers).
- Telecom applications requiring high-voltage step-down conversion).
Q & A
- What is the input voltage range of the LM5088?
The LM5088 operates over an ultra-wide input voltage range of 4.5 V to 75 V.
- What are the two versions of the LM5088 and their key differences?
The LM5088 is available in two versions: LM5088-1 with a ±5% frequency dithering function for EMI reduction, and LM5088-2 with a versatile restart timer for overload protection).
- What is the operating temperature range of the LM5088?
The operating temperature range of the LM5088 is –40°C to +125°C).
- How is the switching frequency of the LM5088 programmed?
The switching frequency of the LM5088 is programmable from 50 kHz to 1 MHz using a single resistor between the RT pin and the GND pin).
- What is the purpose of the emulated current ramp in the LM5088?
The emulated current ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage and low output voltage applications).
- What are the key features of the VCC regulator in the LM5088?
The VCC regulator provides a high voltage, low-dropout bias supply with an output voltage of 7.8 V and is internally current limited to 30 mA).
- What is the package type of the LM5088?
The LM5088 is available in a thermally enhanced 16-pin HTSSOP package.
- What are some typical applications of the LM5088?
Typical applications include automotive infotainment, automotive USB accessory adapters, industrial DC-DC bias and motor drivers, and telecom applications).
- Is the LM5088 AEC-Q100 qualified?
Yes, the LM5088 is AEC-Q100 qualified with a device temperature grade 1: –40°C to +125°C ambient operating temperature range).
- What is the feedback reference voltage of the LM5088?
The feedback reference voltage of the LM5088 is 1.205 V with 1.5% accuracy).
