Overview
The LM2734-Q1, specifically the LM2734XQMKX/NOPB model from Texas Instruments, is a high-frequency, PWM step-down DC/DC converter designed for automotive and other high-reliability applications. This regulator is packaged in a thin 6-pin SOT package, making it ideal for space-constrained designs. It features a wide input voltage range of 3 V to 20 V and an output voltage range of 0.8 V to 18 V, with a maximum output current of 1 A. The device is AEC-Q100 qualified, ensuring it meets stringent automotive standards with a device temperature grade of -40°C to +125°C.
The LM2734-Q1 uses current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. It includes features such as internal soft-start, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection. The regulator is easy to use, requiring a minimum of external components, and supports high-frequency conversion with efficiencies up to 90%.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 3 | 20 | V | |
| Output Voltage Range | 0.8 | 18 | V | |
| Output Current | 1 | A | ||
| Switching Frequency (LM2734X) | 1.2 | 1.6 | 1.9 | MHz |
| Switching Frequency (LM2734Y) | 0.40 | 0.55 | 0.66 | MHz |
| Switch ON Resistance | 300 | 600 | mΩ | |
| Quiescent Current (Switching) | 1.5 | 2.5 | mA | |
| Quiescent Current (Shutdown) | 30 | nA | ||
| Feedback Voltage | 0.784 | 0.800 | 0.816 | V |
| Undervoltage Lockout (VIN Rising) | 2.3 | 2.74 | 2.9 | V |
| Thermal Shutdown Junction Temperature | 165 | °C |
Key Features
- AEC-Q100 qualified for automotive applications with a device temperature grade of -40°C to +125°C.
- Thin SOT-6 package for space-efficient designs.
- Wide input voltage range of 3 V to 20 V and output voltage range of 0.8 V to 18 V.
- Maximum output current of 1 A.
- High switching frequencies: 550 kHz (LM2734Y) and 1.6 MHz (LM2734X).
- Internal 300-mΩ NMOS switch.
- Ultra-low shutdown current of 30 nA.
- 0.8-V, 2% internal voltage reference.
- Internal soft-start circuitry to reduce inrush current.
- Pulse-by-pulse current limit and thermal shutdown for protection.
- Output overvoltage protection.
- Current-mode, PWM operation with internal compensation.
Applications
- Automotive systems, including advanced driver assistance systems (ADAS).
- Local point-of-load regulation in various electronic systems.
- High-reliability industrial and medical devices requiring compact power solutions.
Q & A
- What is the input voltage range of the LM2734-Q1?
The input voltage range is from 3 V to 20 V.
- What are the available switching frequencies for the LM2734-Q1?
The switching frequencies are 550 kHz for the LM2734Y and 1.6 MHz for the LM2734X.
- What is the maximum output current of the LM2734-Q1?
The maximum output current is 1 A.
- What is the package type of the LM2734-Q1?
The package type is a thin 6-pin SOT package.
- Is the LM2734-Q1 AEC-Q100 qualified?
Yes, the LM2734-Q1 is AEC-Q100 qualified for automotive applications.
- What is the typical shutdown current of the LM2734-Q1?
The typical shutdown current is 30 nA.
- Does the LM2734-Q1 have internal soft-start circuitry?
Yes, the LM2734-Q1 has internal soft-start circuitry to reduce inrush current during startup.
- What protection features does the LM2734-Q1 include?
The LM2734-Q1 includes pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.
- What is the feedback voltage of the LM2734-Q1?
The feedback voltage is typically 0.8 V with a 2% tolerance.
- How does the undervoltage lockout (UVLO) work in the LM2734-Q1?
The UVLO prevents the device from operating until the input voltage exceeds 2.74 V (typical) and has a hysteresis of approximately 440 mV.
