Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

MIC21LV32 Datasheet(PDF) 24 Page - Microchip Technology

Part No. MIC21LV32
Description  36V Dual Phase, Advanced COT Buck Controller Stackable for Multiphase Operation
Download  50 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC21LV32 Datasheet(HTML) 24 Page - Microchip Technology

Back Button MIC21LV32 Datasheet HTML 20Page - Microchip Technology MIC21LV32 Datasheet HTML 21Page - Microchip Technology MIC21LV32 Datasheet HTML 22Page - Microchip Technology MIC21LV32 Datasheet HTML 23Page - Microchip Technology MIC21LV32 Datasheet HTML 24Page - Microchip Technology MIC21LV32 Datasheet HTML 25Page - Microchip Technology MIC21LV32 Datasheet HTML 26Page - Microchip Technology MIC21LV32 Datasheet HTML 27Page - Microchip Technology MIC21LV32 Datasheet HTML 28Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 24 / 50 page
background image
MIC21LV32
DS20006513A-page 24
 2021 Microchip Technology Inc.
duty cycle and inductor value. When the high-side
MOSFET is turned off and the low-side MOSFET is
turned on, as shown as Case#2 in Figure 4-8, the
current through the low-side MOSFET is higher than
the current limit after the blanking time of 150 ns for
seven consecutive cycles. This causes the MIC21LV32
to enter the current limit protection. As shown in
Figure 4-8, the inductor valley current is higher than the
current limit threshold as the MIC21LV32 senses the
low-side MOSFET current.
When the MIC21LV32 enters current limit protection,
both the high-side and low-side MOSFETs are turned
off for both phases for a hiccup time-out of 2 ms. The
inductor current flows through the body diode of the
low-side MOSFET for each phase until it falls down to
zero. The MIC21LV32 initiates the soft start after the
hiccup time-out, as shown in Figure 4-8.
FIGURE 4-8:
MIC21LV32 Current Limit
Threshold Relationship to Output Current.
When multiple MIC21LV32 devices are connected in
parallel to support higher load current, all ILIM pins are
connected together and one resistor is connected from
ILIM to AGND to set the current limit. Only the host
device forces the 9.6 µA current from the ILIM pin. The
secondaries do not force any current, they just read
VILIM. All phases share the same VILIM value under
stackable phase configuration.
The
MIC21LV32
current
limit
needs
to
be
temperature-insensitive when precise sense resistors
or RDSON of the low-side MOSFETs are used.
Since the RDSON resistance increases to about two
times, from 25°C to 125°C, an external NTC resistor is
required to program the current limit in this case. In
case regular precise sense resistors are used, no NTC
resistance is needed.
To realize a positive temperature coefficient from the
negative
temperature
coefficient
of
the
NTC
resistance, the current limit per phase was internally
generated, as shown in Equation 4-13.
EQUATION 4-13:
From Equation 4-13, one can derive the VILIM value
through Equation 4-14.
EQUATION 4-14:
To program the target VILIM voltage, Equation 4-15 is
used.
EQUATION 4-15:
EXAMPLE 4-1:
CALCULATION OF RILIM
FOR BOTTOM MOSFET
RDSON CURRENT SENSING
As shown in Example 4-1, the sizing of current limit per
phase needs to be verified over temperature in order to
make sure Equation 4-13 and Equation 4-14 work
correctly, because it is necessary to always have:
EQUATION 4-16:
Blanking Time
( 150 ns)
Current Limit
Threshold
SW
Soft Start
Sequence
Starts Here
Hiccup Time-out
( 2 ms)
Output
Voltage
Low-Side
MOSFET
Current
High-Side
MOSFET
Current
ON state
OFF
state
1
2
3
4
5
7
Short on
Output
7 Consecutive Current Limit Events
Case#1
Case#2
•For ILIM = 10A per phase, RDSON = 10 mΩ at
25°C; using Equation 4-14,
VILIM = 1.2V – 4 * 10 mΩ * 10A = 1.2V – 0.4V = 0.8V
at 25°C.
• To get 0.8V on the ILIM pin with a 9.6 µA
constant current source, we need a
programming equivalent resistance of
RILIM = 0.8V/9.6 µA = 83.3 kΩ at 25°C.
• If the temperature increases to 125°C, then
RDSON at 125°C = 20 mΩ at the same 10A limit.
• Therefore, VILIM = 1.2V – 4 * 20 mΩ * 10A =
1.2V – 0.8V = 0.4V at 125°C. Then,
RILIM = 0.4V/9.6 µA = 41.7 kΩ at 125°C.
Where:
ILIM = Desired Current Limit per Phase
VILIM = Programmable Voltage at ILIM Pin
ILIM =
0.3 – 0.25 × VILIM
RDSON
VILIM = 1.2V – 4 × RDSON × ILIM
Where:
ICL = 9.6 µA (typical) Constant-Current Source at
ILIM Pin
RILIM = Current Limit Threshold Voltage
Programming Resistance
VILIM = ICL × RILIM
1.2V > 4 × RDSON × ILIM


Similar Part No. - MIC21LV32

ManufacturerPart No.DatasheetDescription
Microchip Technology
Microchip Technology
MIC21LV33 MICROCHIP-MIC21LV33 Datasheet
3Mb / 54P
   36V Dual Phase, Advanced COT Buck Controller with HyperLight Load짰 and Phase Shedding
02/28/20
MIC21LV33YML-TR MICROCHIP-MIC21LV33YML-TR Datasheet
3Mb / 54P
   36V Dual Phase, Advanced COT Buck Controller with HyperLight Load짰 and Phase Shedding
02/28/20
More results

Similar Description - MIC21LV32

ManufacturerPart No.DatasheetDescription
Microchip Technology
Microchip Technology
MIC21LV33 MICROCHIP-MIC21LV33 Datasheet
3Mb / 54P
   36V Dual Phase, Advanced COT Buck Controller with HyperLight Load짰 and Phase Shedding
02/28/20
Texas Instruments
Texas Instruments
TPS40140 TI-TPS40140 Datasheet
1Mb / 65P
[Old version datasheet]   DUAL OR 2-PHASE, STACKABLE CONTROLLER
TPS53851 TI1-TPS53851 Datasheet
1Mb / 64P
[Old version datasheet]   DUAL OR 2-PHASE, STACKABLE CONTROLLER
TPS40140 TI1-TPS40140_16 Datasheet
2Mb / 68P
[Old version datasheet]   Dual or 2-Phase, Stackable Controller
Shenzhen Huazhimei Semiconductor Co., Ltd
Shenzhen Huazhimei Semi...
HM1462 HMSEMI-HM1462 Datasheet
614Kb / 8P
   40Vin 2 Outputs COT Buck Controller
Texas Instruments
Texas Instruments
TPS40180 TI-TPS40180 Datasheet
1Mb / 52P
[Old version datasheet]   SINGLE PHASE STACKABLE CONTROLLER
Intersil Corporation
Intersil Corporation
ISL6592 INTERSIL-ISL6592 Datasheet
378Kb / 21P
   6-Phase Digital Multiphase Controller
Texas Instruments
Texas Instruments
TPS40140 TI-TPS40140_15 Datasheet
2Mb / 71P
[Old version datasheet]   TPS40140 Dual or 2-Phase, Stackable Controller
Intersil Corporation
Intersil Corporation
ISL6315 INTERSIL-ISL6315_07 Datasheet
392Kb / 20P
   Two-Phase Multiphase Buck PWM Controller with Integrated MOSFET Drivers
ISL6563 INTERSIL-ISL6563 Datasheet
516Kb / 19P
   Two-Phase Multiphase Buck PWM Controller with Integrated MOSFET Drivers
More results


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz