描述 Description

The MIC2169B is a high-efficiency, simple to use 500kHz PWM synchronous buck control IC housed in a small MSOP-10 ePad package. It allows compact DC/DC solutions with a minimal external component count and cost. The device features high output driver capability to drive loads up to 30A. The MIC2169B operates from a 3V to 14.5V input, without the need of any additional bias voltage. The output voltage can be precisely regulated down to 0.8V. The adaptive all N-Channel MOSFET drive scheme allows efficiencies over 95% across a wide load range within the smallest possible printed circuit board space area.The MIC2169B senses current across the high-side N-Channel MOSFET, eliminating the need for an expensive and lossy current-sense resistor. Current limit accuracy is maintained by a positive temperature coefficient that tracks the increasing RDS(ON) of the external MOSFET. Further cost and space are saved by the internal in-rush-current limiting digital soft-start. The MIC2169B is identical to the MIC2169A except it supports pre-bias loads. Internal pre-bias circuit prevents output voltage drooping and excessive reverse inductor current when powering up with a pre-bias voltage at the output. The MIC2169B is available in a 10-pin MSOP and a thermally-capable 10-pin ePad MSOP package, with a wide junction operating range of -40°C to +125°C.

特性 Features

? 3V to 14.5V input voltage range
? Adjustable output voltage down to 0.8V
? 500kHz PWM operation
? Up to 95% efficiency
? Output pre-biased protection
? Built-in 2.2? drivers to drive two N-Channel MOSFETs
? Adaptive gate drive increases efficiency
? Simple, externally-compensated voltage-mode PWM control
? Short minimum ON time of 30ns allowing very low duty cycle
? Fast transient response
? Adjustable current limit senses high-side N-Channel MOSFET current
? Hiccup mode short-circuit protection
? No external current-sense resistor
? Internal soft-start current source
? Dual function COMP and EN pin allows low-power shutdown
? Available in a small size 10-pin MSOP and 10-pin MSOP ePad package

簡介

MIC2169B屬于集成電路（IC）的PMIC-穩(wěn)壓器-DCDC開關(guān)式控制器。由制造生產(chǎn)的MIC2169BDC-DC 開關(guān)控制器PMIC（電源管理集成電路）DC 到 DC 開關(guān)式控制器是用于高效率電路的穩(wěn)壓 IC，其配置為生成高于（突升或步升）或低于（突降或步降）輸入電源的輸出電源電壓。其他拓?fù)浣Y(jié)構(gòu)可能包括：降壓-升壓、反激、正激、Cuk、SEPIC、全橋、半橋和推挽式。這些器件不同于需要最小電壓并“燒盡”多余電壓的線性穩(wěn)壓器。