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
- 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 32 Class B requirements
- Versatile synchronous buck DC/DC
controller
- Wide input voltage range of 3.5 V to 80 V
- 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V
- 150°C maximum junction temperature
- Lossless DCR or shunt current sensing
- Shutdown mode current of 2.3 µA
- No-load sleep current of 9.5 µA
- Internal soft-start ramp of 3 ms
- Stackable up to two phases
- Internal bootstrap diode
- Switching frequency from 100 kHz to 2.2
MHz
- SYNC in and SYNC out capability
- Selectable PFM or FPWM modes
- 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
- Create a custom design using the LM5148 with WEBENCH Power Designer
Description for the LM5148
The LM5148 is a 80-V, 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 can be set up in idual-phase mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.
The LM5148 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 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 3-ms soft-start time, and thermal shutdown protection with automatic recovery.
The LM5148 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package.