Packaging information
| Package | Pins VQFNP (RWG) | 40 |
| Operating temperature range (°C) -40 to 150 |
| Package qty | Carrier 250 | SMALL T&R |
Features for the LM5140-Q1
- Qualified for Automotive Applications
- AEC-Q100 Test Guidance With the Following
- Device Temperature Grade 1: –40°;C to +125°;C Ambient Operating Temperature
- Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C4B
- Input Operating Range from 3.8 V to 65 V (70 V Absolute Maximum)
- Two Interleaved Buck Controllers With:
- VOUT1 Fixed 3.3 V, 5 V, or Adjustable from 1.5 V – 15 V, Accuracy ±1%
- VOUT2 Fixed 5 V, 8 V, or Adjustable from 1.5 V – 15 V, Accuracy ±1%
- Fixed 2.2-MHz or 440-kHz Switching Frequency, Accuracy ±7%
- Optional Synchronization to an External Clock
- SYNC Output Clock for Additional Converters
- Shutdown Mode Current: 9 µA Typical
- No Load Standby Current: 35 µA Typical (One Channel Operating)
- Current Limit Threshold Programmable to 50 mV or 75 mV, Accuracy ±10%
- Independent Enable Inputs for VOUT1 and VOUT2
- Hiccup Mode Protection for Sustained Overload
- Independent Power Good Outputs
- High-Side and Low-Side Gate Drivers With Adjustable Slew Rate Control
- Selectable Diode Emulation or Continuous Conduction at Light Load
- 40-Pin VQFN Package With Wettable Flanks
Description for the LM5140-Q1
The LM5140-Q1 is a dual synchronous buck controller intended for high voltage wide VIN step-down converter applications. The control method is based on current mode control. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting, and easier loop compensation.
The LM5140-Q1 features adjustable slew rate control to simplify compliance with the CISPR and automotive EMI requirements. The LM5140-Q1 operates at selectable switching frequencies of 2.2 MHz or 440 kHz with the two controller channels switching 180°; out of phase. In light or no-load conditions, the LM5140-Q1 operates in skip cycle mode for improved low power efficiency. The LM5140-Q1 includes a high voltage bias regulator with automatic switchover to an external bias supply to improve efficiency and reduce input current. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode fault protection for sustained overloads, independent power good outputs, and independent enable inputs.