Microchip MIC2111 Manual


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MIC2111B
High-Performance, Multi- Mode,
Step- Down Controller
Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - http://www.micrel.com
October
13, 2015
Revision 2.1
General Description
Micrel MIC2111B’s is a programmable frequency, valley- -
current/voltage-mode PWM controller that provides the
control and protection features necessary for power
devices and drivers use current sensing across the that
inductor. The MIC2111B state can provide single tri- PWM
logic signal to work with either power stage modules or -
discrete driver The device has precision and MOSFETs.
enable and power functions for sequencing of -good (PG)
multiple power suppl In addition the solution ies. , is
compatible with intelligent power stages in a high-current,
step-down DC/DC converter.
To optimize system size and system efficiency, the
MIC2111B frequ ency can be programmed from 200kHz to
2MHz. The device operates in power-saving mode at light
loads by reducing udio rangefrequency. Optional outside a
operation the is possible when power-stage is configured
in light load mode. The solution uses different ial current
sensing for better current limit accuracy- and a dedicated
differential amplifier for remote output sensing for accurate
output voltage control. has a high The MIC2111B -gain
transconductance amplifier for loop compensation.
External slope compensation can added through be a
resistor to avoid sub-harmonic oscillations. Other features
include programmable OCP, output and thermal OVP,
OTP protections. The MIC2111B offers Micrel’s proprietary
bi-directional, single wire fault communication for total
system protection.
The MIC2111B 20-pis available in a in 3mm × 3mm TQ FN
package and has a junction temperature range of –40°C to
+125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
Single 3.3V or 5V supply
4 Supports load currents up to 0A
- -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, OTP, and output thermal OVP,
dedicated FAULT pin for system safe startup/stopb
Internal thermal shutdown and UVLO
• ° ° –40 C to +125 C junction temperature range
- TQ Available in 20 pin 3mm × 3mm FN package
Applications
Servers and work stations
Routers, switches networking/telecom infrastructure ,
Printers, scanners, graphics and video cards
- High current, high performance POLs


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC2111

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