LX7309
Advanced Multi-topology Current-Mode Controller
Overview
The LX7309 is a versatile current-mode DC-DC controller for isolated and non-isolated topologies, featuring an internal differential current-sense amplifier for Kelvin connectivity and low 200mV threshold for low sense resistances and high efficiency. The LX7309 provides an out-of-phase drive signal for implementing synchronous rectification or for active clamps. Max duty cycle is 50%, which is helpful in implementing the simple Forward converter topology, but also helps avoid subharmonic instability without requiring slope compensation in other cases. It has differential voltage sensing for implementing other topologies too. The switching frequency can be setfrom 100-500 kHz, and can be synchronized up to 1MHz. The input has programmable UVLO thresholds. The controller offers Power Fail Warning (PFW). Programmable-threshold Low Power (pulse-skip) Mode is provided to improve light-load efficiency.
Features
- Current-mode control for fast line and load correction responses
- 50% duty cycle limit for simple Forward converters and for avoiding subharmonic instability in Flyback, Boost and Buck-Boost
- 200mV peak current sense signal with differential Kelvin sensing for noise immunity and higher efficiency
- Two out-of-phase driver stages for synchronous rectification and active clamps
- ROHS-compliant, 24-pin, 4x4 mm QFN
Resources
| Datasheets | |
|---|---|
 LX7309 Datasheet |
| Literature | |
|---|---|
| Troubleshooting PoE with Port Failure Warning |
| User Guides | |
|---|---|
| LX7309 PoE to 12V 4A Synchronous Flyback Evaluation Board User Guide |
|
| PD70100+LX7309 15W Evaluation Board User Guide |
| Reliability | |
|---|---|
| Quality & Reliability Report - Aliso Viejo, CA, USA - Garden Grove, CA, USA - San Jose, CA, USA |
| Certifications | |
|---|---|
| ISO 9001:2008 Certificate - Aliso Viejo, CA, USA - Garden Grove, CA, USA - San Jose, CA - USA |
| Literature | |
|---|---|
| DC-DC Product Selection Guide |
|
| LX7309 15W 12Vin 48Vout Isolated Boost EVB User Guide |
|
| Microsemi Programmable Logic Power Management Selection Guide |
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Ordering
Switching Controller, Current-mode, 1000kHz Switching Freq-Max, PQCC24
| Distributor | SKU | Stock | MOQ | Pkg | |
|---|---|---|---|---|---|
| Arrow Electronics | LX7309ILQ | 7 | 1 | .. | Buy Now |
| DigiKey | 150-LX7309ILQ-ND | .. | Bulk | No Stock |
