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MIC24420 Datasheet(PDF) 5 Page - Micrel Semiconductor

Part No. MIC24420
Description  2.5A Dual Output PWM Synchronous Buck Regulator IC
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC24420 Datasheet(HTML) 5 Page - Micrel Semiconductor

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Micrel, Inc.
MIC24420/MIC24421
June 2012
5
M9999-062012-C
Electrical Characteristics
(4) (Continued)
Parameter
Condition
Min
Typ
Max
Units
Oscillator / PWM
MIC24420
0.8
1
1.2
Switching Frequency
MIC24421
0.4
0.5
0.6
MHz
MIC24420
70
76
Maximum Duty Cycle
MIC24421
85
90
%
Minimum On-Time
ILOAD > 200mA
(5)
60
ns
High-side Internal MOSFET
On Resistance RDS(ON)
IFET = 1A, VFB=0.8V
150
m
Ω
Low-side MOSFET Driver
Pull Up, ISOURCE = 10mA
4
Ω
DH On-Resistance
Pull Down; ISINK = 10mA
2.5
Ω
Rising Into 1000pF
12
ns
DH Transition Time
Falling Into 1000pF
9
ns
Driver Non-overlap Dead Time
(Adaptive)
25
ns
EN/DLY and Soft-start Control
EN/DLY Pull-up Current
VEN/DLY1= VEN/DLY2 = 0V
5.5
7
8.5
µA
AVDD Threshold
AVDD turns on
0.4
0.58
0.65
V
Soft-start Begins Threshold
Channel soft-start begins
1.1
1.35
1.8
V
Soft-start Ends Threshold
Channel soft-start ends
2
2.4
2.8
V
Power Good
PG Threshold Voltage
VOUT Rising (% of VOUT nominal)
85
90
95
%Nom
PG Output Low Voltage
VFB = 0V, IPG = 1mA
0.08
0.3
V
PG Leakage Current
VFB = 800mV, VPG = 5.5V
5
nA
Thermal Protection
Over-temperature Shutdown
TJ Rising
165
°C
Over-temperature Shutdown
Hysteresis
22
°C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
5. Minimum on-time before automatic cycle skipping begins. See applications section.


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