| Vin (Min) (V) | 3 |
| Vin (Max) (V) | 5.5 |
| Vout (Min) (V) | 0.8 |
| Vout (Max) (V) | 4.6 |
| Iout (Max) (A) | 10 |
| Iq (Typ) (uA) | 1800 |
| Switching frequency (Min) (kHz) | 300 |
| Switching frequency (Max) (kHz) | 1000 |
| Features | Enable, Pre-Bias Start-Up, Tracking |
| Regulated outputs (#) | 1 |
| Number of phases | 1 |
| Rating | Catalog |
- Input Voltage From 3.0V to 5.5V
- Output Voltage Adjustable Down to 0.8V
- Reference Accuracy: ±1.75%, over Full Temperature and Input Voltage Range
- High-Side and Low-Side N-Channel MOSFETs
- Switching Frequency Options of 1 MHz or 300 kHz
- Comprehensive Fault Protection Features:
- High-Side Current Limit
- Low-Side Current Limit
- Output Under-Voltage Protection
- Hiccup Mode Protection Eliminates Thermal Runaway During Fault Conditions
- Externally Programmable Soft-Start with Tracking Capability
- Pre-Bias Start-Up Capability
- VSSOP-10 Package
All trademarks are the property of their respective owners.
The LM3743 is a DC-DC voltage mode PWM buck controller featuring synchronous rectification at 300 kHz or 1 MHz. It can deliver current as high as 20A and step down from an input voltage between 3V and 5.5V down to a minimum output voltage of 0.8V, with a ±1.75% internal reference accuracy. The LM3743 provides a set of comprehensive fault protection features such as high-side current limit, output under-voltage protection, and low-side current limit. When any of these fault protection features are engaged, it enters a hiccup protection mode which is suitable for high reliability systems such as rack mounted servers and telecom base station subsystems. The LM3743 also employs a proprietary monolithic glitch free pre-bias start-up method suited for FPGA and ASIC logic devices. An external programmable soft-start allows for tracking and timing flexibility. The driver features 1.6? of pull-up resistance and 1? of pull-down drive resistance for high power density and very efficient power processing.
