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.
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.