Packaging information
| Package | Pins VQFN (RGY) | 24 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 3,000 | LARGE T&R |
Features for the LM5148-Q1
- AEC-Q100
qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient operating temperature
- Functional Safety-Capable
- Integrated EMI mitigation
- Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
- Optimized for CISPR 25 Class 5 requirements
- Versatile synchronous buck DC/DC
controller
- Wide input voltage range of 3.5V to 80V
- 1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to 55 V
- 150°C maximum junction temperature
- Shutdown mode current of 2.3µA
- No-load sleep current of 9.5µA
- Internal soft-start ramp of 3ms
- Stackable up to two phases
- Internal bootstrap diode
- Switching frequency from 100kHz to 2.2MHz
- SYNC in and SYNC out capability
- Inherent protection features for robust
design
- Internal hiccup mode overcurrent protection
- ENABLE and PGOOD functions
- VCC, VDDA, and gate-drive UVLO protection
- Internal or external loop compensation
- Thermal shutdown protection with hysteresis
- VQFN-24 package with wettable flanks
- VQFN-19 package for increased high voltage pin spacing (Figure 5-2)
- Create a custom design using the LM5148-Q1 with WEBENCH Power Designer
Description for the LM5148-Q1
The LM5148-Q1 is a 80V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5148-Q1 can be set up in dual-phase mode (paralleled output) with accurate current sharing for high-current applications. The device can operate at input voltages as low as 3.5V, at nearly 100% duty cycle if needed.
The LM5148-Q1 has a unique EMI reduction feature known as Dual Random Spread Spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Additional features of the LM5148-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3ms soft-start time, and thermal shutdown protection with automatic recovery.
The LM5148-Q1 controller comes in 3.5mm × 5.5mm, 24-pin VQFN and a 19-pin VQFN, 4.50mm × 3.5mm thermally enhanced packages with wettable flank pins to facilitate optical inspection during manufacturing. For high voltage applications that require additional pin spacing between low voltage pins and high voltage pins, the pin spacing was increased to 0.6mm by removing a pin. To increase the spacing from VIN to the exposed pad, the exposed pad was reduced to 1.7mm × 2.3mm.