Overview
The LM5088MHX-1/NOPB is a high-voltage non-synchronous buck controller produced by Texas Instruments. This controller is designed to implement efficient, high-voltage buck converters using a minimum number of external components. It operates over an ultra-wide input voltage range of 4.5 V to 75 V and features a level-shifted gate driver capable of controlling an external N-channel buck switch. The control method is based on peak current mode control utilizing an emulated current ramp, which reduces noise sensitivity and allows reliable control of very small duty cycles necessary in high input voltage and low output voltage applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 - 75 | V |
| Output Voltage Range | 1.205 V (adjustable) | V |
| Switching Frequency Range | 50 kHz - 1 MHz | Hz |
| Package Type | HTSSOP (16 pins) | - |
| Operating Temperature Range | -40 to 125 | °C |
| ESD Classification | HBM Level 2, CDM Level C5 | - |
| Junction Temperature | 150 | °C |
| Storage Temperature Range | -65 to 150 | °C |
Key Features
- AEC-Q100 qualified with device temperature grade 1: –40°C to +125°C ambient operating temperature range
- Emulated current mode control
- Drives external high-side N-channel MOSFET
- Ultra-wide input voltage range from 4.5 V to 75 V
- Low IQ shutdown and standby modes
- High duty cycle ratio feature for reduced dropout voltage
- Spread spectrum EMI reduction (LM5088-1)
- Hiccup timer for overload protection (LM5088-2)
- Adjustable output voltage from 1.205 V with 1.5% feedback reference accuracy
- Wide bandwidth error amplifier
- Single resistor oscillator frequency setting
- Oscillator synchronization capability
- Programmable soft start
- High voltage, low dropout bias regulator
- Thermal shutdown protection
Applications
- Automotive infotainment systems
- Automotive USB accessory adapters
- Industrial DC-DC bias and motor drivers
- Telecom applications
- Other applications requiring efficient step-down of high, unregulated input voltage
Q & A
- What is the input voltage range of the LM5088MHX-1/NOPB?
The input voltage range is from 4.5 V to 75 V.
- What is the switching frequency range of the LM5088MHX-1/NOPB?
The switching frequency range is from 50 kHz to 1 MHz.
- What type of control method does the LM5088MHX-1/NOPB use?
The control method is based on peak current mode control utilizing an emulated current ramp.
- What are the key features of the LM5088-1 and LM5088-2 versions?
The LM5088-1 provides a ±5% frequency dithering function to reduce EMI, while the LM5088-2 provides a versatile restart timer for overload protection.
- What is the operating temperature range of the LM5088MHX-1/NOPB?
The operating temperature range is from –40°C to +125°C.
- What type of package does the LM5088MHX-1/NOPB come in?
The device is available in a thermally enhanced 16-pin HTSSOP package.
- Does the LM5088MHX-1/NOPB have thermal shutdown protection?
- What is the purpose of the high voltage, low dropout bias regulator in the LM5088MHX-1/NOPB?
The high voltage, low dropout bias regulator provides the VCC bias supply for the controller and the bootstrap MOSFET gate driver.
- Can the LM5088MHX-1/NOPB be used in automotive applications?
- How is the oscillator frequency set in the LM5088MHX-1/NOPB?
The oscillator frequency is set using a single resistor between the RT pin and the GND pin.
