Overview
The LM2734YMK is a high-frequency, PWM step-down DC/DC converter produced by Texas Instruments (though it may be listed under National Semiconductor due to historical reasons). This monolithic regulator is housed in a 6-pin Thin SOT (TSOT-23-6) package, making it ideal for applications requiring minimal board space. The device is designed to provide local DC/DC conversion with fast transient response and accurate regulation, utilizing state-of-the-art 0.5-µm BiCMOS technology. It supports input voltages from 3V to 20V and can deliver output voltages as low as 0.8V, with a maximum output current of 1A.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3V to 20V | V |
| Output Voltage Range | 0.8V to 18V | V |
| Output Current | 1A | A |
| Switching Frequency | 550 kHz (LM2734Y) or 1.6 MHz (LM2734X) | kHz / MHz |
| Package Type | TSOT-23-6 | |
| Number of Pins | 6 | |
| Efficiency | Up to 90% | % |
| Standby Current | 30 nA | nA |
| RoHS Compliance | Yes |
Key Features
- High-frequency PWM step-down DC/DC conversion
- Internal 300-mΩ NMOS switch for high power density
- Fast transient response and accurate regulation
- Internal soft-start circuitry to reduce inrush current
- Pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection
- External shutdown with ultra-low standby current of 30 nA
- Current-mode control with internal compensation for high-performance regulation
- Support for small surface-mount inductors and chip capacitors due to high switching frequencies
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?
The input voltage range is from 3V to 20V.
- What is the maximum output current of the LM2734YMK?
The maximum output current is 1A.
- What are the switching frequencies available for the LM2734YMK?
The switching frequencies are 550 kHz (LM2734Y) or 1.6 MHz (LM2734X).
- What is the package type of the LM2734YMK?
The package type is TSOT-23-6.
- Does the LM2734YMK have built-in protection features?
Yes, it includes pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.
- What is the standby current of the LM2734YMK in shutdown mode?
The standby current is 30 nA.
- Is the LM2734YMK RoHS compliant?
Yes, it is RoHS compliant.
- What is the efficiency of the LM2734YMK?
The efficiency can be up to 90%.
- What are some typical applications of the LM2734YMK?
Typical 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 require many external components?
No, it requires a minimum of external components and is supported by online design tools like WEBENCH.
