LM5146-Q1 Texas instruments

LM5146-Q1

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LM5146-Q1

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Описание

The LM5146-Q1 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146-Q1 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications, ADAS (surround view ECU) and HEV/EV systems.Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications

AEC-Q100 qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient temperature range
Functional Safety-Capable
- Documentation available to aid functional safety system design
Versatile synchronous buck DC/DC controller
- Wide input voltage range of 5.5 V to 100 V
- 150°C maximum junction temperature
- 0.8-V reference with ±1% feedback accuracy
- Adjustable output voltage from 0.8 V to 60 V
- 40-ns t_ON(min) for high V_IN / V_OUT ratio
- 140-ns t_OFF(min) for low dropout
- Lossless R_DS(on) or shunt current sensing
- Optimized for CISPR 25 Class 5 requirements
Switching frequency from 100 kHz to 1 MHz
- SYNC In and SYNC Out capability
- Selectable diode emulation or FPWM
7.5-V gate drivers for standard V_TH MOSFETs
- 14-ns adaptive dead-time control
- 2.3-A source and 3.5-A sink capability
Inherent protection features for robust design
- Adjustable output voltage soft start
- Hiccup-mode overcurrent protection
- Input UVLO with hysteresis
- VCC and gate-drive UVLO protection
- Precision enable input and open-drain PGOOD indicator for sequencing and control
- Thermal shutdown protection with hysteresis
20-pin VQFN package with wettable flanks
Create a custom design using the LM5146-Q1 with WEBENCH Power Designer

Vin (min) (V)	5.5
Vin (max) (V)	100
Vout (min) (V)	0.8
Vout (max) (V)	60
Iout (max) (A)	30
Iq (typ) (mA)	1.75
Switching frequency (min) (kHz)	100
Switching frequency (max) (kHz)	1000
Features	Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable
Operating temperature range (°C)	-40 to 150
Regulated outputs (#)	1
TI functional safety category	Functional Safety-Capable
Number of phases	1
Rating	Automotive
Control mode	Voltage mode
Type	Controller