LM5164 IC Chip

LM5164 （100-V Input, 1-A synchronous buck DC/DC converter with ultra-low I_Q）

Introduction

The LM5164 synchronous buck converter is designed to regulate over a wide input voltage range,minimizing the need for external surge suppression components. A minimum controllable on-time of 50 ns facilitates large step-down conversion ratios, enabling the direct step-down from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5164 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for wide input supply range industrial and high cell count battery pack applications.

With integrated high-side and low-side power MOSFETs, the LM5164 delivers up to 1A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. Additional features of the LM51 64 include ultra-low I_Q and diode emulation mode operation for high light-load efficiency，innovative peak and valley overcurrent protection, integrated VCC bias supply and bootstrap diode, precision enable and input UVLO, and thermal shutdown protection with automatic recovery. An open-drain PGOOD indicator provides sequencing, fault reporting, and output voltage monitoring.

The LM5164 is available in a thermally-enhanced, 8-pin So PowerPAD™ package. Its 1.27-mm pin pitch provides adequate spacing for high-voltage applications.

Features

Designed for reliable and rugged applications
-Wide input voltage range of 6V to 100V
– Junction temperature range: – 40°C to +150°C
– Fixed 3-ms internal soft-start timer
– Peak and valley current-limit protection
– Input UVLO and thermal shutdown protection
Suited for scalable Industrial power supplies and battery packs
– Low minimum on- and off-times of 50 ns
一Adjustable switching frequency up to 1 MHz
一Diode emulation for high light-load efficiency
– 10.5-μA no-load input quiescent current
一3-μA shutdown quiescent current
– Optimized for CISPR 32 EMI standard
Integration reduces solution size and cost
-COT mode control architecture
-Integrated 0.725Ω NFET buck switch supports wide duty-cycle range
-Integrated 0.34Ω NFET synchronous rectifier eliminates external Schottky diode
–  1.2V internal voltage reference
-No loop compensation components
-Internal VCC bias regulator and boot diode
-Open-drain power good indicator
– 8-Pin SOIC package with PowerPADTM
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