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Overview
| Topology | Buck Converter |
| Input voltage | 3-36 V |
| Switching frequency | 200-2200 kHz |
| Output 1 | 5 V / 6 A |
| Output 2 | 5 V / 6 A |
| Output 3 | 3.3 V / 6 A |
| Output 4 | 3.3 V / 6 A |
| IC revision | A |
Description
The LM6x4xx family of buck regulators are regulators that provide either fixed or adjustable output voltage that can be set from 1 V to 95% of expected input voltage. These regulators operate under a wide input voltage range or 3 V to 36 V and have transient tolerance up to 42 V.The family is designed for low EMI. The devices incorporate pin-selectable spread spectrum and an adjustable SW node rise time. Dual Random Spread Spectrum (DRSS) frequency hopping is set to ±5.5% (typical), drastically reducing peak emissions through a combination of triangular and pseudo random modulation. DRSS also includes advanced techniques to reduce output voltage ripple caused by spread spectrum modulation.An open-drain RESET output with filtering and delayed release gives a true indication of system status. In auto mode, the device automatically transitions between fixed-frequency pulse width modulation (FPWM) and pulse frequency modulation (PFM) modes of operation, allowing an unloaded current consumption of only 5 µA (typical). Electrical characteristics are specified over a junction temperature range of –40°C to +150°C.
Features
- Functional Safety-Capable
- Documentation available to aid functional safety system design
- Input voltage range from 3 V to 36 V
- RESET output with filter and delayed release
- Designed for low EMI:
- CISPR 11/32 class B compliant EVM
- Pin-configurable spread spectrum
- Adjustable SW node rise time
- Above and below AM band operation: pin configurable at fixed 400 kHz and 2.2 MHz or adjustable from 200 kHz – 2.2 MHz
- Low EMI symmetrical pinout
- Light load mode is pin-configurable for constant frequency or pulse frequency modulation (PFM)
- High-efficiency solution
- 95% efficient for an 8-A load
- 5-µA input current while unloaded in auto mode
- <1-µA shutdown current (typical)
- High power density
- Built-in compensation, soft start, current limit, thermal shutdown, and UVLO
- 4.5-mm × 3.5-mm wettable flank QFN package
Typical applications
- Industrial transport, Industrial PC, PLC, DCS, and PAC
- Avionics
- Semiconductor test equipment
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | RDC max.(mΩ) | Mount | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR(mA) | Z @ 1 GHz(Ω) | H(mm) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-LHMI SMT Power Inductor, 0.68 µH, 15.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance0.68 µH | Performance Rated Current15.1 A | Saturation Current @ 10%15.9 A | Saturation Current @ 30%31.6 A | – | Self Resonant Frequency72 MHz | – | DC Resistance5.5 mΩ | MountSMT | – | – | – | – | – | Height2.8 mm | – | ||||
 | WE-HCI SMT Flat Wire High Current Inductor, 2.4 µH, 18.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.4 µH | Performance Rated Current18.6 A | Saturation Current @ 10%6.9 A | Saturation Current @ 30%17 A | DC Resistance4.75 mΩ | Self Resonant Frequency67 MHz | MaterialSuperflux | DC Resistance5.225 mΩ | MountSMT | – | – | – | – | – | Height4.7 mm | – | ||||
 | WE-MPSB EMI Multilayer Power Suppression Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | – | – | – | – | – | – | – | DC Resistance6 mΩ | MountSMT | Impedance @ 100 MHz100 Ω | Maximum Impedance160 Ω | Maximum Impedance1100 MHz | Rated Current8000 mA | Impedance @ 1 GHz150 Ω | Height2.3 mm | TypeHigh Current |