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PDF MIC2111B Data sheet ( Hoja de datos )
| Número de pieza | MIC2111B | |
| Descripción | Step-Down Controller | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC2111B
High-Performance, Multi-Mode,
Step-Down Controller
General Description
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 × 3mm TQFN
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
• 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 × 3mm TQFN package
Applications
• Servers and work stations
• Routers, switches, networking/telecom infrastructure
• Printers, scanners, graphics and video cards
• High current, high-performance POLs
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 13, 2015
Revision 2.1
1 page  
Micrel, Inc.
MIC2111B
Absolute Maximum Ratings(1)
VCC to AGND ................................................ −0.3V to +6.0V
VEN/SS, VFREQ to AGND......................... −0.3V to (VCC +0.3V)
VOVP, VTJ, VFAULTb to AGND ................ −0.3V to (VCC + 0.3V)
VRS±, VHS/LS, VISEN±, VFB to AGND ....... −0.3V to (VCC + 0.3V)
VSLOPE to AGND............................................... −0.3V to 20V
Junction Temperature .............................................. +150°C
Storage Temperature (TS)......................... −65°C to +150°C
Lead Temperature (soldering, 10s)............................ 260°C
ESD
Human Body Model(3) .............................................. 2kV
Machine Model ......................................................200V
Operating Ratings(2)
Supply Voltage (VCC).................................... 3.135V to 5.5V
Enable Input (VEN) ................................................. 0V to VCC
Junction Temperature (TJ) ........................ −40°C to +125°C
Junction Thermal Resistance
20-Pin 3mm × 3mm TQFN (θJA) .......................60°C/W
20-Pin 3mm × 3mm TQFN (θJC) .......................10°C/W
Electrical Characteristics(4)
VCC = 5V; TA = 25°C, unless noted. Bold values indicate −40°C ≤ TJ ≤ +125°C.
Parameter
Condition
Min. Typ. Max. Units
Power Supply Input (VCC)
VCC Input Voltage Range
Valley current mode, voltage mode
3.135
5.5 V
VCC UVLO Threshold
VCC UVLO Hysteresis
VCC rising
2.75 2.85 2.95
100
V
mV
Quiescent Supply Current
Shutdown Supply Current
Output Voltage
No switching, VFB >0.8V
VEN = 0V
2.1
10
mA
µA
Output Voltage
0.6 3.46 V
Minimum VCC-to-Output Set Point
Voltage Accuracy
Minimum VCC − VOUT headroom required
(RS+) - (RS-)
1.3
0.594 0.6 0.606
V
V
Remote Sense Amplifier Gain
Remote Sense Amplifier
Source/Sink Current
VDIFF/[(VRS+) − (VRS−)], VRS− = 0V ; VRS+ = 3.6V
0.997 1.000 1.003
550
V/V
µA
RS+ Input Impedance
175 kΩ
RS− Input Impedance
87 kΩ
RS+/RS− Common-Mode Voltage
100 mV
FB Bias Current
VFB = 0.6V
Transconductance Error Amplifier
5 100
nA
Error Amplifier Transconductance
Error Amplifier Source/Sink Current
FB-to-COMP gm
2
175 220
mS
µA
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside operating range
3. Devices are ESD sensitive. Handling precautions recommended. Human body model is 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
October 13, 2015
5
Revision 2.1
5 Page 
Micrel, Inc.
Typical Characteristics (Continued)
0.05
0
-0.05
-0.1
-0.15
-0.2
-0.25
0
Load Regulation
vs. Output Current
16VIN
12VIN
8VIN
5 10 15 20
OUTPUT CURRENT (A)
25
Line Regulation vs. VCC
(VIN = 12V, VOUT = 1.2V, 5A Load)
0.00
-0.05
-0.10
-0.15
-0.20
LINE REGULATION
-0.25
2.5
3.5 4.5
VCC (V)
5.5
MIC2111B
October 13, 2015
11
Revision 2.1
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MIC2111B.PDF ] | |
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