LM25148数据手册集成电路（IC）的PMIC-稳压器-DCDC开关式控制器规格书PDF

描述 Description

The LM25148 is a 42-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 LM25148 can be set up in interleaved 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 LM25148 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.

特性 Features

• Functional Safety-Capable
• Documentation available to aid functional safety system design

• 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 42 V
• 1% accurate, fixed 3.3-V, 5-V, 12-V, or adjustable output from 0.8 V to 36 V
• 150°C maximum junction temperature
• Lossless DCR or shunt current sensing
• Shutdown mode current: 2.3 µA
• No-load sleep current: 9.5 µA
• Internal 3-ms soft-start ramp
• Stackable up to two phases
• Advanced dropout with frequency foldback
• 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 LM25148 with WEBENCH Power Designer