Overview
The LM2734YMK/NOPB is a high-frequency, PWM step-down DC/DC converter produced by Texas Instruments. This monolithic regulator is packaged in a 6-pin Thin SOT (TSOT23-6) package, making it ideal for applications where space is limited. The device is designed to provide local DC/DC conversion with fast transient response and accurate regulation, requiring a minimum of external components. It uses state-of-the-art 0.5-µm BiCMOS technology, enabling high power density and efficient operation over a wide input voltage range of 3 V to 20 V and output voltage range of 0.8 V to 18 V.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage Range | 3 | 20 | V | |
| Output Voltage Range | 0.8 | 18 | V | |
| Output Current | 1 | A | ||
| Switching Frequency (LM2734Y) | 0.40 | 0.55 | 0.66 | MHz |
| Switching Frequency (LM2734X) | 1.2 | 1.6 | 1.9 | MHz |
| Switch ON Resistance | 300 | 600 | mΩ | |
| Shutdown Current | 30 | nA | ||
| Internal Voltage Reference | 0.784 | 0.800 | 0.816 | V |
| Operating Temperature Range | -40 | 125 | °C |
Key Features
- Thin SOT-6 package for minimal board space
- High-frequency operation: 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 to reduce inrush current
- Current-mode, PWM operation with internal compensation
- Pulse-by-pulse current limit and thermal shutdown
- Output overvoltage protection
- External shutdown control via the enable pin
Applications
- Local point-of-load regulation
- Core power in hard disk drives (HDDs)
- Set-top boxes
- Battery-powered devices
- USB-powered devices
- DSL modems
- Notebook computers
Q & A
- What is the input voltage range of the LM2734YMK/NOPB?
The input voltage range is from 3 V to 20 V.
- What are the switching frequencies for the LM2734Y and LM2734X models?
The LM2734Y operates at 550 kHz, while the LM2734X operates at 1.6 MHz.
- What is the maximum output current of the LM2734YMK/NOPB?
The maximum output current is 1 A.
- What is the package type and pin count of the LM2734YMK/NOPB?
The device is packaged in a 6-pin Thin SOT (TSOT23-6) package.
- What is the shutdown current of the LM2734YMK/NOPB?
The shutdown current is typically 30 nA.
- Does the LM2734YMK/NOPB have internal overvoltage protection?
- What is the internal voltage reference of the LM2734YMK/NOPB?
The internal voltage reference is 0.8 V with a 2% tolerance.
- What are some common applications for the LM2734YMK/NOPB?
Common applications include local point-of-load regulation, core power in HDDs, set-top boxes, battery-powered devices, USB-powered devices, DSL modems, and notebook computers.
- Does the LM2734YMK/NOPB support soft start?
- What is the operating temperature range of the LM2734YMK/NOPB?
The operating temperature range is from -40°C to 125°C.
