Microchip MIC2111 Manual de Usario

Microchip Niet gecategoriseerd MIC2111

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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
Micrel, Inc.
MIC2111B
13, 2015 2 Revision 2.1
Typical Application
MIC2111B and DrMOS for a 2 A Synchronous Buck Converter5
Micrel, Inc.
MIC2111B
13, 2015 3 Revision 2.1
Ordering Information
Part Number Switching
Frequency
Junction
Temperature
Range
Current- Sense
Gain
Power
Stage Package Lead
Finish
MIC2111BYMT 200kHz to 2MHz − ° °40 C to +125 C 30V/V DrMOS 20-Pin
3mm × 3mm TQFN Pb-Free
Pin Conguration
20-Pin 3mm × 3mm TQFN (MT)
(Top View)
Pin Description
Pin Number I/O Pin Name Pin Name
1 I SLOPE
Valley Current Mode Slope compensation can be adjusted by adding a resistor from this pin to :
VIN (input power supply).
Voltage Mode: Artificial ramp controlled by SLOPE resistor
2 I EN Enable (Input): A logic signal to enable or disable the controller. The EN pin is CMOS
compatible. Logic high = enable, logic low = disable or shutdown. Do not leave floating.
3 I SEL Control Mode - Selection Pin: Connect this pin to AGND for valley current mode operation. -
Leave this pin open for voltage mode control operation.
4 I OVP Output OVP programming pin. Connect a resistive divider to set OVP.OVP pin has 0.6V
reference (see Functional Description for more details).
5 I FREQ Switching Frequency Adjust (Input): Connect a resistor from this pin to GND to set the
switching frequency.
6 I TJ Power Module Temperature Sense Pin. Connect resistor divider to program J comparator TJ. T
has 0.6V reference (see Functional Description for more details).
7 O PG Power Good (Output): Open n output, an external resistor to Vdrai OUT is required for pull-up.
8 I SS Soft-start pin for limiting inrush current. A resistor from this pin to ground sets the soft-start
time. If enabled, stop time is same as soft s -oft -start. Contact factory for soft stop.

Especificaciones del producto

Marca: Microchip
Categoría: Niet gecategoriseerd
Modelo: MIC2111

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