Overview
The LM2734YQMKX/NOPB is a high-performance, constant frequency PWM buck regulator IC produced by Texas Instruments. This device is designed to deliver a 1-A load current and operates within a wide input voltage range of 3 V to 20 V, with an output voltage range of 0.8 V to 18 V. The LM2734YQMKX/NOPB features a preset switching frequency of 550 kHz, allowing the use of small surface-mount inductors and capacitors, which minimizes the board space required for DC-DC converters. The regulator is internally compensated, making it simple to use and requiring few external components. It uses current-mode control to regulate the output voltage and includes internal soft-start circuitry to reduce inrush current during startup.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Input Voltage Range | V | 3 | 20 | ||
| Output Voltage Range | V | 0.8 | 18 | ||
| Switching Frequency (LM2734Y) | MHz | 0.40 | 0.55 | 0.66 | |
| Switching Frequency (LM2734X) | MHz | 1.2 | 1.6 | 1.9 | |
| Maximum Duty Cycle (LM2734Y) | % | 90 | 96 | ||
| Maximum Duty Cycle (LM2734X) | % | 85 | 92 | ||
| Switch ON Resistance | VBOOST - VSW = 3V | mΩ | 300 | 600 | |
| Switch Current Limit | VBOOST - VSW = 3V | A | 1.2 | 1.7 | 2.5 |
| Quiescent Current (Switching) | mA | 1.5 | 2.5 | ||
| Quiescent Current (Shutdown) | VEN = 0V | nA | 30 | ||
| Shutdown Threshold Voltage | VEN Falling | V | 0.4 | ||
| Enable Threshold Voltage | VEN Rising | V | 1.8 |
Key Features
- High switching frequencies of 550 kHz (LM2734Y) or 1.6 MHz (LM2734X) for compact design
- Internal soft-start circuitry to reduce inrush current during startup
- Current-mode control for high-performance regulation
- Internal compensation for simplicity and minimal external components
- Pulse-by-pulse current limit and thermal shutdown for protection
- Output overvoltage protection
- Ultra-low standby current of 30 nA in shutdown mode
- 300-mΩ NMOS switch for efficient power delivery
- 0.8-V, 2% internal voltage reference for precise output regulation
- AEC-Q100 Grade 1 qualified for automotive applications
Applications
The LM2734YQMKX/NOPB is suitable for a variety of applications requiring high-efficiency and compact DC-DC conversion. These include:
- Automotive systems: Due to its AEC-Q100 Grade 1 qualification, it is ideal for automotive power supplies.
- Industrial power supplies: For applications requiring high reliability and efficiency.
- Consumer electronics: Such as power supplies for portable devices, set-top boxes, and other compact electronic devices.
- Medical devices: Where high efficiency and reliability are critical.
Q & A
- What is the input voltage range of the LM2734YQMKX/NOPB?
The input voltage range is 3 V to 20 V.
- What are the switching frequencies available for this regulator?
The switching frequencies are 550 kHz for the LM2734Y and 1.6 MHz for the LM2734X.
- What is the maximum output current of the LM2734YQMKX/NOPB?
The maximum output current is 1 A.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is typically 30 nA.
- Does the LM2734YQMKX/NOPB have built-in protection features?
Yes, it includes pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.
- What is the purpose of the internal soft-start circuitry?
The internal soft-start circuitry reduces inrush current during startup.
- Is the LM2734YQMKX/NOPB suitable for automotive applications?
Yes, it is AEC-Q100 Grade 1 qualified for automotive applications.
- What is the typical switch ON resistance of the LM2734YQMKX/NOPB?
The typical switch ON resistance is 300 mΩ.
- How does the regulator control the output voltage?
The regulator uses current-mode control to regulate the output voltage.
- What is the minimum output voltage that can be set for the LM2734YQMKX/NOPB?
The minimum output voltage is 0.8 V.
