MIC2111B

Micrel's MIC2111B is a programmable-frequency, valley-current/voltage-mode PWM controller that provides the control and protection features necessary for power devices and drivers that use current sensing across the inductor. The MIC2111B can provide single tri-state PWM logic signal to work with either power-stage modules or discrete driver and MOSFETs. The device has precision enable and power-good (PG) functions for sequencing of multiple power supplies. In addition, the solution is compatible with intelligent power stages in a high-current, step-down DC/DC converter.To optimize system size and system efficiency, the MIC2111B frequency can be programmed from 200kHz to 2MHz. The device operates in power-saving mode at light loads by reducing frequency. Optional outside audio range operation is possible when the power-stage is configured in light load mode. The solution uses differential current sensing for better current-limit accuracy and a dedicated differential amplifier for remote output sensing for accurate output voltage control. The MIC2111B has a high-gain transconductance amplifier for loop compensation. External slope compensation can be added through a resistor to avoid sub-harmonic oscillations. Other features include programmable OCP, output OVP, and thermal OTP protections. The MIC2111B offers Micrel?s proprietary bi-directional, single wire fault communication for total system protection.The MIC2111B is available in a 20-pin 3mm x 3mm TQFN package and has a junction temperature range of -40°C to +125°C.

产品特性
  • Single 3.3V or 5V supply
  • Supports load currents up to 40A
  • Programmable valley-current/voltage-mode PWM architecture
  • 3.3V logic PWM output compatible with power-stage modules and DrMOS modules
  • Single tri-state PWM output
  • Programmable switching frequency: 200kHz to 2MHz
  • Differential remote sensing for output voltage and inductor current
  • 0.6V reference voltage with total ±1% accuracy for output
  • Adjustable soft-start/soft-stop and pre-biased safe startup
  • Supports light load and outside audio modes
  • Programmable slope compensation and loop compensation
  • Enable input, power-good (PG) output for sequencing
  • Programmable OCP, output OVP, thermal OTP, and dedicated FAULTb pin for system safe startup/stop
  • Internal thermal shutdown and UVLO
  • -40°C to +125°C junction temperature range
  • Available in 20-pin 3mm x 3mm TQFN package
技术参数
Parameter Name Value Value
Supported Topologies Buck Buck
Supported Outputs 1 1
Minimum Input Voltage (V) 3.3 3.3
Maximum Input Voltage (V) 5 5
PFM, Discontinuous, Hyperlight load, or Skip Mode True True
Typical Tolerance (%) 1 1
Operating Frequency (Hz) 200k - 2M 200k - 2M
External Clock Sync False False
Power Good Signal True True
Soft Start False False
Internal Compensation False False
Internal Voltage Bias False False
Enable Pin False False
Current Limit / Short Circuit Protection False False
文档资料
MIC2111B - High-Performance, Multi-Mode, Step-Down ControllerData Sheets11/05/20153058KB
MIC2111B BrochureBrochures10/16/20153058KB
MIC2111BSilicon Product11/22/20150B
MIC2111B Eval Board User GuideUser Guides10/16/20151301KB
MIC2111B Evaluation BoardUser Guides11/11/20151301KB
订购型号
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MIC2111BYMT-TR20WQFN-40C to +125CT/R1.090.910.820.760.72
器件无铅环保信息
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2111BYMT-T50.12080020WQFN3x3x0.6mmNiPdAue4
MIC2111BYMT-TR0.12080020WQFN3x3x0.6mmNiPdAue4
MIC2111B - High-Performance, Multi-Mode, Step-Down Controller MIC2111B
MIC2111B - High-Performance, Multi-Mode, Step-Down Controller MIC2111B
MIC2111B Brochure MIC2111B
MIC2111B Brochure MIC2111B
MIC2111B Evaluation Board MIC2111B