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MIC21LV32 Datasheet(PDF) 7 Page - Microchip Technology

Part No. MIC21LV32
Description  36V Dual Phase, Advanced COT Buck Controller Stackable for Multiphase Operation
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC21LV32 Datasheet(HTML) 7 Page - Microchip Technology

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DS20006513A-page 7
MIC21LV32
On Timer
Nominal Switching Frequency
per Phase
fSWNOM_PH
450
500
550
kHz
VIN = 12V, VOUTS = 5V,
RFREQ = 40.2 kΩ
Minimum Switching Frequency
per Phase
fSWMIN_PH
—100
kHz
VIN = 12V, VOUTS = 5V,
RFREQ = 200 kΩ
Maximum Switching Frequency
per Phase
fSWMAX_PH
—800
kHz
VIN = 12V, VOUTS = 5V,
RFREQ = 25.5 kΩ
Minimum On-Time
TONMIN
60
ns
Measured in application (Note 2)
Minimum Off-Time
TOFFMIN
—360
ns
VFBS = 0V
Maximum Duty Cycle
DMAX
—85
%
fSW = 400 kHz per phase
(Note 4)
Minimum Duty Cycle
DMIN
—0
%
VFBS = +1V
Current Limit
ILIM Source Current
ICL
8.64
9.6
10.56
µA
ILIM Source Current Temperature
Coefficient
TCICL
0
ppm/°C
Nominal Current Limit Threshold
Voltage per Phase
VILIM_TH
142
156
174
mV
RILIM = 60.4 kΩ,
RILIM = 105 kΩ,
RILIM = 21 kΩ
—47
mV
—250
mV
Negative Current Limit Threshold
Voltage
VILIM_NTH
60
75
90
mV
RILIM = 60.4 kΩ
Current Sharing Amplifier
Current Sense Amplifier Input
Offset
VIOS
-2.25
0
+2.25
mV
VCSN1 = VCSN2 = 0V,
VFBS = 0.59V (Note 3)
CSH Operating Point
VCSH_OP
1.154
1.19
1.226
VVCSN1 = VCSN2 = VCSP1 =
VCSP2 = 0V
Current Sense Amplifier(s) Gain
GCSA
8
V/V
As reflected on VCSH pin and
DROOP pin
Current Sense Input Voltage
Range
VCS
-120
+120
mV
-40ºC ≤ TJ ≤ +125ºC
Phase to Phase Current Balance
ΔIPH
5
%
Using equal sense resistors on
the bottom, equal inductances,
VOUT = 5V, fSW = 500 kHz,
VIN = 12V,
VCSP1 – VCSN1=-120 mV,
VCSP2 – VCSN2=-120mV
MIC21LV32 to MIC21LV32
Current Balance
ΔIPH_DEV
8
%
In stacking applications
ELECTRICAL CHARACTERISTICS(1) (CONTINUED)
Electrical Characteristics: VIN = 12V; VOUT = 1.2V; fSW = 500 kHz/phase; VBST – VSW =5V; TA = +25°C, unless noted.
Boldface values indicate -40°C ≤ TJ ≤ +125°C.
Parameters
Symbol
Min.
Typ.
Max.
Units
Conditions
Note 1: Specification for packaged product only.
2: Ensured by design and characterization. Not production tested.
3: Measured in Test mode.
4: The maximum duty cycle is limited by the fixed mandatory off-time of typically 360 ns.
5: Power dissipation at 36V input does not allow the measurement at higher VDD current levels. The bolded
Min. and Max. Characteristics specify 125°C as the maximum junction temperature, not the maximum
ambient temperature. Measurements can be done at a higher current and higher input voltage in a pulsed
way to avoid heating the junction over 125°C.


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